
/*

  SmartClient Ajax RIA system
  Version v9.1p_2021-05-18/LGPL Deployment (2021-05-18)

  Copyright 2000 and beyond Isomorphic Software, Inc. All rights reserved.
  "SmartClient" is a trademark of Isomorphic Software, Inc.

  LICENSE NOTICE
     INSTALLATION OR USE OF THIS SOFTWARE INDICATES YOUR ACCEPTANCE OF
     ISOMORPHIC SOFTWARE LICENSE TERMS. If you have received this file
     without an accompanying Isomorphic Software license file, please
     contact licensing@isomorphic.com for details. Unauthorized copying and
     use of this software is a violation of international copyright law.

  DEVELOPMENT ONLY - DO NOT DEPLOY
     This software is provided for evaluation, training, and development
     purposes only. It may include supplementary components that are not
     licensed for deployment. The separate DEPLOY package for this release
     contains SmartClient components that are licensed for deployment.

  PROPRIETARY & PROTECTED MATERIAL
     This software contains proprietary materials that are protected by
     contract and intellectual property law. You are expressly prohibited
     from attempting to reverse engineer this software or modify this
     software for human readability.

  CONTACT ISOMORPHIC
     For more information regarding license rights and restrictions, or to
     report possible license violations, please contact Isomorphic Software
     by email (licensing@isomorphic.com) or web (www.isomorphic.com).

*/
//>	@class	EventHandler
//
// The ISC system provides a predictable cross-browser event-handling mechanism for ISC
// widgets. Events can be handled both at the page level (i.e., globally), and at the level of
// individual widgets.
// <p>
// With the exception of a few page-specific events ('load', 'unload', 'idle' and 'resize'),
// events are processed in the following sequence:
// <p>
// 1. The event is sent to any global (page-level) event handlers. These handlers can cancel
// further propagation of the event by returning false.  You can register to listen for any of the
// events linked in the seeAlso section (below) by calling +link{classMethod:Page.setEvent()}
// method.
// <p>
// 2. If the event occurred on a form element or a link, it is passed on to the browser so that
// the element will perform its default action. No widget receives the event.
// <p>
// 3. If the event occurred on an enabled widget (but not on a form element or link inside
// the widget), it is sent to that widget's event handler, if any. This handler can cancel
// further propagation of the event by returning false.  An "enabled" widget is any widget that
// defines an event handler for one of the supported events.  Interceptable events are defined in
// the +link{class:Canvas#methods#events, "widgetEvents" section of Canvas}.
// <p>
// 4. The event is "bubbled" up to the widget's parent in the containment hierarchy, if any.
// Again, the parent's handler for the event can cancel further propagation by returning
// false. This step is repeated, with the event "bubbling" up through the containment
// hierarchy, until a top-level widget is reached or the event is explicitly canceled.
// In brief, the ISC event model offers the best features of browser event models:
// <ul>
// <li> Page-first event handling allows you to reliably process or cancel any event before it
//      affects the objects on the page.
// <li> Event "bubbling" ensures that parent widgets receive events sent to their children,
//      and allows you to create generalized parent-level handlers rather than duplicating
//      code in each child.
// </ul>
// Note: Canceling propagation of an event may cancel its side effects as well, including the
// generation of other (synthetic) events. For example, if a global mouseDown handler returns
// false, drag-and-drop events will not be generated. Specific effects are discussed in the
// descriptions of the various events in the following sections.
// <p>
// SmartClient libraries will not interfere with native event handling when events occur
// outside of a target widget. You can therefore have HTML that is not ISC-based on the same
// page as widget objects that will react to native events as you would expect.
// <p>
// You can use isc.Event as an alias for isc.EventHandler.
// 
// @see type:PageEvent    
// @see classMethod:Page.setEvent()
// @see classMethod:Page.clearEvent()
// @see class:Canvas#methods#widgetEvents
//
// @treeLocation   Client Reference/System
// @visibility external
//<




// create the isc.EventHandler object
isc.ClassFactory.defineClass("EventHandler");
// nicknames - isc.Event is publicly documented as an alias
isc.EH = isc.Event = isc.EventHandler;
// add class properties and constants
isc.EventHandler.addClassProperties(
{ 	
    //>	@classAttr	isc.EventHandler.lastEvent		(object : {} : IRWA)
	//		Last event that was processed by our event system.  We store the properties
	//		 of the event in a separate object so we can access them uniformly on both
	//		 platforms and so we can remember characteristics of the last event we've
	//		 seen even when we're not in the script context of this event.<br><br>
	//		
	//		To access properties of the last event, use:<ul>
	//			<li>isc.EventHandler.getLastEvent()
	//			<li>isc.EventHandler.getX()
	//			<li>isc.EventHandler.getY()
	//			<li>isc.EventHandler.getScreenX()
	//			<li>isc.EventHandler.getScreenY()
	//			<li>isc.EventHandler.getButtonNum()
	//			<li>isc.EventHandler.leftButtonDown()
	//			<li>isc.EventHandler.rightButtonDown()
	//			<li>isc.EventHandler.getKey()
    //          <li>isc.EventHandler.getKeyEventCharacterValue()
    //          <li>isc.EventHandler.getKeyEventCharacter()
	//			<li>isc.EventHandler.shiftKeyDown()
	//			<li>isc.EventHandler.ctrlKeyDown()
	//			<li>isc.EventHandler.altKeyDown()
	//			<li>isc.EventHandler.metaKeyDown()
	//			<li>isc.EventHandler.modifierKeyDown()
    //      </ul>
	//
	//		@group events
	//		@see	isc.EventHandler.getMouseEventProperties()
    //      @see    isc.EventHandler.getKeyEventProperties()
    //  @visibility eventhandler
	//<
	lastEvent : {},						
	
    //>	@classAttr	isc.EventHandler._dropRegistry		(array : [] : IRWA)
	//		Registry of canvases that are interested in receiving drop events.
	//		@group dragdrop
	//		@see	isc.EventHandler.eventHandledNatively()
    //  @visibility internal
	//<
    _dropRegistry : [],			        

	//>	@classAttr	isc.EventHandler._maskRegistry		(array : [] : IA)
	//		Registry of canvases that have their own _eventMask peers to block mouse
	//		events. Implemented so that canvases with contentsURL (iframe contents)
	//		won't swallow events during drag & drop. When a drag operation begins,
	//		we show the masks for all canvases in this registry.
    // @visibility internal
	//<
	_maskRegistry : [],
	
	//>	@classAttr	isc.EventHandler.passThroughEvents		(boolean : true : IRWA)
	//			if true, we pass events to anchors and form elements automatically.
	//			false == trap these events
	//		@see	isc.EventHandler.eventHandledNatively()
    // @visibility internal
	//<
	passThroughEvents:true,

	//>	@classAttr	isc.EventHandler.maskNativeEvents (boolean : true : IRWA)
	//      Whether the clickmask should mask events on non ISC-elements as well.  
    // @visibility internal
	//<
    maskNativeTargets:true,
						
	//>	@classAttr	isc.EventHandler.STILL_DOWN_DELAY (integer : 100 : IRWA)
    // amount of time between mouseStillDown messages (msec)
    // @visibility external
    //<
	STILL_DOWN_DELAY 	: 100,
	
	//=	@classAttr	isc.EventHandler.DOUBLE_CLICK_DELAY	amount of time between doubleClicks (msec)
    
	DOUBLE_CLICK_DELAY  : 500,
    //> @classAttr isc.EventHandler.IDLE_DELAY (integer : 10 : IRWA)
    // amount of time between idle messages (msec)
    // @visibility external
    //<
	IDLE_DELAY 			: 10,

	//> @classAttr isc.EventHandler.STOP_BUBBLING (string : "***STOP***" : IRA)
	// Return this constant from a child event to stop the event propagating to its parent,
	// without suppressing any native browser handling associated with the event.
	// Developers should not need to modify this value - it should be treated as read-only
	// in most circumstances.
	// @visibility external
	//<
	STOP_BUBBLING : "***STOP***",		


	//>	@classAttr	isc.EventHandler.ALL_EDGES	(Array of string : ["T","L","B","R","TL","TR","BL","BR"] : IR)
	// Constant containing the full set of edges a component may be resized from.
	// When a component is marked as canDragResize, this will be the default set of edges
	// from which it may be resized.
	// @visibility external
	//<
	ALL_EDGES : ["T","L","B","R","TL","TR","BL","BR"],

    eventTypes :	{	
        // Events are documented on Canvas as methods since that's how we expect users to register
        // them on widgets.  Some are also documented here for reference by Page.setEvent()

        //> @type PageEvent
        //
        // Events registerable via +link{classMethod:Page.setEvent()}
        //
        // 
        // @value "idle" 
        //        Fires repeatedly (every 10 ms by default) when the system is idle (i.e.,
        //        not busy running other scripts) after the page is loaded.
        // @value "load" 
        //        Fires when the page has finished loading. It corresponds to the
        //        browser 'load' event normally handled by window.onload.
        // @value "unload" 
        //        Fires when the page is exited or unloaded. It corresponds to the
        //        browser 'unload' event normally handled by window.onunload.
        // @value "resize" 
        //        Fires when the browser window is resized by the user. It corresponds
        //        to the browser 'resize' event normally handled by window.onresize.    
        //
        //
        // @value "mouseDown"
        //        Fires when the left mouse button is pressed on the Page.
        // @value "rightMouseDown"
        //        Fires when the right mouse button is pressed on the Page.
        // @value "mouseMove"
        //        Fires when the mouse moves on the Page.
        // @value "mouseUp"
        //        Fires when the left mouse button released on the Page.
        // @value "click"
        //        Fires when the user clicks the mouse on the Page.
        // @value "doubleClick"
        //        Fires when the uesr double-clicks on the Page.
        //
        // @value "showContextMenu"
        //        Fires when the right mouse button is clicked on the page.  If your event handler
        //        for this event returns false, the native browser context menu will be suppressed.<br>
        //        Note: On the Macintosh platform, <code>Command+Click</code> may be used instead
        //        of right-button click to trigger a context menu event.<br>
        //        On the Opera browser, <code>Ctrl+Shift+Click</code> should be used instead of
        //        right-button click.
        //
        // @value "keyPress" Fires when a user presses a key on the keyboard. 
        //
        // @value "orientationChange" Fires when the +link{Page.getOrientation()} changes due
        //        to browser-window resize or rotation of a mobile device.
        //
        // see classMethod:Page.setEvent()
        // see classMethod:Page.clearEvent()
        // @visibility external
        //<
        
        MOUSE_LEAVE: "mouseLeave",

    	MOUSE_DOWN : "mouseDown",
    	RIGHT_MOUSE_DOWN : "rightMouseDown",
    	MOUSE_MOVE : "mouseMove",			
    	MOUSE_UP : "mouseUp",				    
    	SHOW_CONTEXT_MENU : "showContextMenu",	

        CLICK : "click",		
    	DOUBLE_CLICK : "doubleClick",		
    	// the following mouse events are not available on Page 
    	MOUSE_OUT : "mouseOut",				
    	MOUSE_STILL_DOWN : "mouseStillDown",
    	MOUSE_OVER : "mouseOver",

        POINTER_DOWN: "pointerDown",
        POINTER_MOVE: "pointerMove",
        POINTER_UP: "pointerUp",
        POINTER_CANCEL: "pointerCancel",

        //>Touch
    	TOUCH_START: "touchStart",	
    	TOUCH_MOVE: "touchMove",		
    	TOUCH_END: "touchEnd",
    	TOUCH_CANCEL: "touchCancel",
    	LONG_TOUCH:"longTouch",
        //<Touch

        // XXX classify
    	SET_DRAG_TRACKER : "setDragTracker",
        GET_DRAG_DATA : "getDragData",      
        RELEASE_DRAG_DATA : "releaseDragData", 
        

        DRAG_START:"dragStart",
        DRAG_STOP:"dragStop",  
    	DRAG_MOVE : "dragMove",
    	DRAG_OUT : "dragOut",	
        DRAG_REPOSITION_START : "dragRepositionStart",
        DRAG_REPOSITION_MOVE : "dragRepositionMove",
        DRAG_REPOSITION_STOP : "dragRepositionStop",
        DRAG_RESIZE_START : "dragResizeStart",
        DRAG_RESIZE_MOVE : "dragResizeMove",
        DRAG_RESIZE_STOP : "dragResizeStop",

    	DROP_OVER : "dropOver",
    	DROP_MOVE : "dropMove",
    	DROP_OUT : "dropOut",
    	DROP : "drop",			

        TRANSITION_END : "transitionEnd",

    	KEY_DOWN : "keyDown",	
    	KEY_UP : "keyUp",		
    	KEY_PRESS : "keyPress",	
        MOUSE_WHEEL : "mouseWheel",
    	
    	SELECT_START : "selectStart",
        SELECTION_CHANGE : "selectionChange",
        FOCUS_IN : "focusIn",
        FOCUS_OUT : "focusOut",

    	IDLE : "idle",				
    	LOAD : "load",						
    	UNLOAD : "unload",					
    	RESIZE : "resize",
    	ORIENTATION_CHANGE : "orientationChange"
    },

    // Map used by getMouseEventProperties to convert from native mouse event names to 
    // canonicalized versions (available as constants on the EH class).
    _nativeMouseEventMap : {
        // By default all browsers give lowercase event names for the following events*
        //  *Verified on IE6, Windows; Moz 1.73, Windows; Safari 2, Mac; Moz 1.6, Unix;
        mousemove:"mouseMove",
        mousedown:"mouseDown",
        mouseup:"mouseUp",

        contextmenu:"contextMenu",

        // Proprietary to IE6
        mousewheel:"mouseWheel",
        selectionchange:"selectionChange",
        // Proprietary to Moz
        DOMMouseScroll:"mouseWheel",


        // Also handle being passed an already canonicalized version - may happen if the 
        // event passed to getMouseEventProperrties was an ISC event rather than a native event
        mouseMove:"mouseMove",
        mouseDown:"mouseDown",
        mouseUp:"mouseUp",
        mouseWheel:"mouseWheel",

        pointerdown: "pointerDown",
        pointermove: "pointerMove",
        pointerup: "pointerUp",
        pointercancel: "pointerCancel",

        //>Touch
        touchstart:"touchStart",
        touchmove:"touchMove",
        touchend:"touchEnd",
        touchStart:"touchStart",
        touchMove:"touchMove",
        touchEnd:"touchEnd",
        //<Touch

        dragstart:"dragStart",
        drag:"drag",
        dragenter:"dragEnter",
        dragexit:"dragExit",
        dragleave:"dragLeave",
        dragover:"dragOver",
        drop:"drop",
        dragend:"dragEnd",

        selectionstart:"selectionStart",
        selectionStart:"selectionStart",
        selectionchange:"selectionChange",
        selectionChange:"selectionChange"
    },

    // mini state machine state used for firing synthetic mouseDown/mouseUp on Android
    _touchEventStatus : {
        READY_FOR_TOUCH: "ready",
        TOUCH_STARTED: "started",
        TOUCH_ENDING: "ending",
        TOUCH_COMPLETE: "complete"
    },

    
    _eventHandlerArgString:"event,eventInfo",   

    
	//>	@type	DragOperation
	// Builtin types of drag and drop interactions
	//		@group	dragdrop
    //	@value	isc.EventHandler.DRAG_RESIZE			Resizing by dragging
	DRAG_RESIZE : "dragResize",			
    //	@value	isc.EventHandler.DRAG_REPOSITION		Repositioning by dragging
	DRAG_REPOSITION : "dragReposition",	
    //	@value	isc.EventHandler.DRAG_SCROLL            Scroll/pan by drag
	DRAG_SCROLL : "dragScroll",	
	// @value isc.EventHandler.DRAG_SELECT  Select content via drag
	DRAG_SELECT : "dragSelect",
	
    //	@value	isc.EventHandler.DRAG			General drag (custom implementation)
	DRAG : "drag",
	//<										

    //>	@type	DragAppearance
    // 		Different types of effects for showing dragging behavior.
    //	@group	dragdrop
	//	@visibility external
    //
    //	@value	"none"
    //      No default drag appearance is indicated. Your custom dragging routines should
    //      implement some behavior that indicates that the user is in a dragging situation,
    //      and where the mouse is.
	NONE : "none",
    //	@value	"tracker"
    //      A "drag tracker" object is automatically shown and moved around with the
    //      mouse. This is generally set to an icon that represents what is being dragged. The
    //      default tracker is a 10 pixel black square, but you can customize this icon. This
    //      dragAppearance is not recommended for use with drag resizing or drag moving.
	TRACKER : "tracker",
    //	@value	"target"
    //      The target object is actually moved, resized, etc. in real time. This is
    //      recommended for drag repositioning, but not for drag resizing of complex objects.
	TARGET : "target",
    //	@value	"outline"
    //      An outline the size of the target object is moved, resized, etc. with the
    //      mouse. This is recommended for drag resizing, especially for objects that take a
    //      significant amount of time to draw.
	OUTLINE : "outline",
    //<	

    //>	@type DragIntersectStyle
    // Different styles of determining intersection: with mouse or entire rect of target
    //
    // @value "mouse" Look for drop targets that are under the current mouse cursor position.
	INTERSECT_WITH_MOUSE : "mouse",
    // @value "rect" Look for drop targets by intersection of the entire rect of the drag
    //               target with the droppable target.
	INTERSECT_WITH_RECT : "rect",
    // @group dragdrop
	// @visibility external
    //<


    artificialDragTargetDefaults: {
        _constructor: "Canvas",
        canDrag: true,
        useNativeDrag: true,
        canDrop: true,
        dragAppearance: "none",

        cloneDragData : function () {
            return isc.EH.getNativeDragData();
        }
    },


    //>	@classAttr  dragTargetShadowDepth   (number : 10 : IRWA);
    //  If we are showing a shadow for some widget on drag, how deep should the shadow be.
    //  @group  dragdrop
    //<
    dragTargetShadowDepth : 10,

    
    dragOffsetX: 0,
    dragOffsetY: 0,

	_anchorTags : {
        A : true,
        AREA : true
    },
	_formTags : {
        INPUT : true,
        TEXTAREA : true,
        SELECT : true,
        OPTION : true
    },
    _labelString : "LABEL",

    // native event name to camelCase name
    _nativeKeyEventMap : {
        keydown:"keyDown",
        keyup:"keyUp",
        keypress:"keyPress",
        
        contextmenu:"contextMenu"
    },

    // In IE we don't get native keyPress events on non-character keys.
    // for these keys we generate synthetic keyPress events in handleKeyDown.
    // We use this map of non-character keys to determine which keys are not going to produce
    // a keyPress event natively in IE.
    
    _nonCharacterKeyMap : {
        Backspace:8,
        Tab:9,
        Shift:16,
        Ctrl:17,
        Alt:18,
        Pause_Break:19,
        Caps_Lock:20,
        // Note - escape seems to be a special case - it gives us no character value, but will fire 
        // a keyPress event natively
//        Escape:27,
        Page_Up:33,
        Page_Down:34,
        End:35,
        Home:36,
        Arrow_Left:37,
        Arrow_Up:38,
        Arrow_Right:39,
        Arrow_Down:40,
        Insert:45,
        Delete:46,
        Meta:91,
        //Meta:92,  
        f1:112,
        f2:113,
        f3:114,
        f4:115,
        f5:116,
        f6:117,
        f7:118,
        f8:119,
        f9:120,
        f10:121,
        f11:122,
        f12:123,        
        Num_Lock:144,
        Scroll_Lock:145
    },

    // In IE, certain alpha keys don't generate a normal keyPress event if the ctrl key
    // is down at the same time.  The map _modifierAppliedKeyMap has bindings for known
    // keys with this behavior.
    
    _modifierAppliedKeyMap : {
        A: true,
        C: true,
        D: true,
        R: true,
        V: true
    },

    // In Safari / Chrome we get no native keyPress events for character keys as well.
    // However the list is slightly different from in IE - it includes Escape.
    
    _safariNonCharacterKeyMap : {
        Backspace:true,
        Tab:true,
        Shift:true,
        Ctrl:true,
        Alt:true,
        Pause_Break:true,
        Caps_Lock:true,
        Escape:true,
        Page_Up:true,
        Page_Down:true,
        End:true,
        Home:true,
        Arrow_Left:true,
        Arrow_Up:true,
        Arrow_Right:true,
        Arrow_Down:true,
        Insert:true,
        Delete:true,
        Meta:true,
        Menu:true,
          
        f1:true,
        f2:true,
        f3:true,
        f4:true,
        f5:true,
        f6:true,
        f7:true,
        f8:true,
        f9:true,
        f10:true,
        f11:true,
        f12:true,
        // Untested 
        Num_Lock:true,
        Scroll_Lock:true
    },

    // Virtual key map
    // virtual key code mappings for every key on the keyboard.
    // Note: While each code maps to a separate key, we're normalizing to a key name - IE
    // we're not going to differentiate between Enter on the keyboard and Enter on the numeric 
    // key pad (we can't in some cases on some browsers anyway, and this functionality would be
    // confusing if you weren't expecting it)
    

    // JSDoc the developer friendly keynames - these are required for accessKeys, registering
    // page level key events, etc.
    //> @type KeyName
    //
    // Strings to identify the various keys on the keyboard.
    // <ul>
    // <li>  For alpha keys, the single (uppercase) character value is used, such as "Q"
    // <li>  For Numeric keys, the number is used as in a single character string, like "1"
    // <li>  Function keys are identified as <code>"f1"</code> - <code>"f12"</code>
    // <li>  Non alpha-numeric character keys (such as the key for "[" / "{") are identified by
    //       their unmodified character value (the value obtained by hitting the key without 
    //       holding shift down), by default - exceptions are listed below.
    // <li>  Additional key names:<br>
    //      - <code>Space</code><br>    
    //      - <code>Tab</code><br>    
    //      - <code>Enter</code><br>
    //      - <code>Escape</code><br>
    //      - <code>Backspace</code><br>
    //      - <code>Insert</code><br>
    //      - <code>Delete</code><br>
    //      - <code>Arrow_Up</code><br>
    //      - <code>Arrow_Down</code><br>
    //      - <code>Arrow_Left</code><br>
    //      - <code>Arrow_Right</code><br>            
    //      - <code>Home</code><br>
    //      - <code>End</code><br>
    //      - <code>Page_Up</code><br>    
    //      - <code>Page_Down</code><br>   
    //      - <code>Shift</code><br>
    //      - <code>Ctrl</code><br>
    //      - <code>Alt</code>
    // </ul>
    // [Note: Some keys may not be available for capture on every platform]
    // @visibility external
    //<
    // Avoid doc'ing keys we may not be able to capture, or which are likely to vary based on 
    // OEM keyboard layout, etc.
    //      - <code>Print_Screen</code><br>
    //      - <code>Scroll_Lock</code><br>
    //      - <code>Caps_Lock</code><br>
    //      - <code>Pause_Break</code><br>
    //      - <code>Num_Lock</code><br>
    //      - <code>Menu</code><br>
    
    // Key Identifiers differ from keyNames in that we include modifier detection as a
    // boolean - used in a few places in the code
    //> @type KeyIdentifier
    // Identifiers for keys pressed by the user used by various methods.<br>
    // Valid <code>keyIdentifier</code>s can be either +link{KeyName} strings, or objects.<br>
    // If a <code>keyIdentifier</code> is specified as an object, it should have the following
    // properties:<br>
    // - <code>keyName</code>: name of the key<br>
    // - <code>ctrlKey</code>: optional boolean - true if ctrl is down.<br>
    // - <code>shiftKey</code>: optional boolean - true if shift is down.<br>
    // - <code>altKey</code>: optional boolean - true if alt is down.
    // @see type:KeyName
    // @visibility external
    //<
    _virtualKeyMap : {
        // Note - have to quote numeric property names for older browsers
        '0':'_undefined',
                        // 1  Left mouse button 
                        // 2  Right mouse button 
                        // 3  Control-break processing 
                        // 4  Middle mouse button (three-button mouse) 
        '8':'Backspace',
        '9':'Tab',
        
                        //  '12':'Clear',   
        '13':'Enter',

        '16':'Shift',
        '17':'Ctrl',
        '18':'Alt',
        '19':'Pause_Break',
        '20':'Caps_Lock',
                        // 21-25  Reserved for Kanji systems 

        '27':'Escape',
                        // 28-31  Reserved for Kanji systems 
        
        
        '32':'Space',
        '33':'Page_Up',
        '34':'Page_Down',
        '35':'End',
        '36':'Home',
        '37':'Arrow_Left',
        '38':'Arrow_Up',
        '39':'Arrow_Right',
        '40':'Arrow_Down',
                        // 41  SELECT key 
                        // 42  [Win32: "Original equipment manufacturer (OEM) specific"] 
                        // 43  EXECUTE key 
        '44':'Print_Screen',    // 44 PRINT SCREEN key for Win 3.0 and later 
        '45':'Insert',
        '46':'Delete',
                        // 47  HELP key 
        // Note: these are above the main keyboard (not on the numeric keypad)                        
        '48':'0', "49":"1", "50":"2", "51":"3", "52":"4", 
        "53":"5", "54":"6", "55":"7", "56":"8", "57":"9",
        
        // 58-64  Undefined 
        // Exception: These are used on mousedown / mouseup for certain keys normally in
        // the 187-222 range on mac osx / moz
        
                        
        '58':';', // observed on shift+";" key (Mac osx, Moz)
        '59':';', // observed on ";" (mac osx, moz)
        '60':',', // observed on shift+ "," key (mac osx, moz)
        '61':'=', // mac osx, moz
        '62':"/", // observed on shift+ "/" key mac osx, moz
        

        // Standard Char keys                        
        '65':'A', '66':'B', '67':'C', '68':'D', '69':'E', '70':'F', 
        '71':'G', '72':'H', '73':'I', '74':'J', '75':'K', '76':'L', 
        '77':'M', '78':'N', '79':'O', '80':'P', '81':'Q', '82':'R',
        '83':'S', '84':'T', '85':'U', '86':'V', '87':'W', '88':'X',
        '89':'Y', '90':'Z',

        '91':'Meta',    // Meta Left
        '92':'Meta',    // Meta Right

        // 93  Application key [Win32: "Undefined"] 
        //      - from observation, this is returned from the 'context menu' key (next to the right
        //        meta key on windows 2k, IE and Moz, US keyboard) 
        '93':'Menu',
        
        //  94-95 Undefined 

        // keys on the numeric keypad                        
        '96':'0', '97':'1', '98':'2', '99':'3', '100':'4',
        '101':'5', '102':'6', '103':'7', '104':'8', '105':'9',

        '106':'*',  //  The Multiply key 
        '107':'+',  //  Add key  (on the keypad - not "=+")
                        // 108  Separator key 
        '109':'-',  //  Minus key
        '110':'.',  //  Decimal key
        '111':'/',  //  Divide key 

        '112':'f1', '113':'f2', '114':'f3', '115':'f4', '116':'f5', '117':'f6', 
        '118':'f7', '119':'f8', '120':'f9', '121':'f10', '122':'f11', '123':'f12',        
                        // 124-143  Unassigned 

        '144':'Num_Lock',
        '145':'Scroll_Lock',    // OEM specific - true on Windows

                        // 146-159  Unassigned 

        '160':'Shift',  //  Left SHIFT key [Win32: "Unassigned"] 
        '161':'Shift',  //  Right SHIFT key [Win32: "Unassigned"] 
        
        '162':'Ctrl',   //  Left CTRL key [Win32: "Unassigned"] 
        '163':'Ctrl',   //  Right CTRL key [Win32: "Unassigned"] 
        
        '164':'Alt',    //  Left ALT key [Win32: "Unassigned"] 
        '165':'Alt',    //  Right ALT key [Win32: "Unassigned"] 
        
                        //  166-185  Unassigned 
                        //  186-192  OEM specific   * See below

                        //  193-218  Unassigned 
                        //  219-228  OEM specific 
                        //  229  Precedes extended key [Win32: "Unassigned"] 
                        //  230  OEM specific 
                        //  231-232  Unassigned 
                        //  233-245  OEM specific 

        // xxx
        // There is no guarantee for the punctuation keys.  They will vary by locale and 
        // platform.
        // We can't ask for the keyboard mapping, and but let's handle the MS Windows US keyboard 
        // layout by default.
        // NOTE: this is one reason to make use of Ascii keycodes when we have them.
        
        '186':';',      //  VK_OEM_1 0xBA ";:" for US 
        '187':'=',      // '+',  VK_OEM_PLUS 0xBB "+" any country 
        '188':',',      //  VK_OEM_COMMA 0xBC "," any country 
        '189':'-',      //  VK_OEM_MINUS 0xBD "-" any country 
        '190':'.',      //  VK_OEM_PERIOD 0xBE "." any country 
        '191':'/',      //  VK_OEM_2 0xBF "/?" for US 
        '192':'`',      //  VK_OEM_3 0xC0 "`~" for US 
        
        
        '219':'[',      //  VK_OEM_4 0xDB "[{" for US 
        '220':'\\',     //  VK_OEM_5 0xDC "\|" for US 
        '221':']',      //  VK_OEM_6 0xDD "]}" for US 
        '222':"'"       //  VK_OEM_7 0xDE "'"" for US 

        
        ,'224':"Meta"

                        //  VK_OEM_AX 0xE1 AX key on Japanese AX keyboard 
                        //  VK_OEM_102 0xE2 "<>" or "\|" on RT 102-key keyboard 
                        
    },

 
    
    _charsetValueToKeyNameMap : {

        // Don't worry about any control characters that aren't directly mapped to a key
        // on the keyboard
        '8':'Backspace',
        '9':'Tab',
        '13':'Enter',
        '27':'Escape',

        // Normalize the character to the key name
        // Note: This is occasionaly ambiguous - such as when hitting "*", it could be the
        // * above the 8, or it could be the * on the keypad
        // Note: Choosing somewhat arbitrary names for the keys - just make sure this stays
        // constant.
        '32':'Space',   //' '
        '33':'1',   //'!'
        '34':"'",   //'"'
        '35':'3',   //'#',
        '36':'4',   //'$',
        '37':'5',   //'%',
        '38':'7',   //'&',
        
        '39':"'",
        '40':'9',   //'(',
        '41':'0',   //')',
        
        '42':'8',   //'*',  // May be wrong if on the keypad
        '43':'=',   //'+'   // May be wrong if on the keypad 
        
        '44':',',    '45':'-',     '46':'.',    '47':'/',
    
        '48':'0', '49':'1', '50':'2', '51':'3', '52':'4', 
        '53':'5', '54':'6', '55':'7', '56':'8', '57':'9',
        
        '58':';',    //':',
        '59':';',
    
        '60':',',   //'<',
        '61':'=',
        '62':'.',   //'>',
        '63':'/',   //'?',
    
        '64':'2',   //'@',  // an example of US-Only mapping
    
        '65':'A', '66':'B', '67':'C', '68':'D', '69':'E', '70':'F', '71':'G',
        '72':'H', '73':'I', '74':'J', '75':'K', '76':'L', '77':'M', '78':'N',
        '79':'O', '80':'P', '81':'Q', '82':'R', '83':'S', '84':'T', '85':'U',
        '86':'V', '87':'W', '88':'X', '89':'Y', '90':'Z',
        
        '91':'[',   '92':'\\',   '93':']',
        
        '94':'6',   //'^',
        '95':'-',   //'_',
        '96':'`',
    
        '97':'A',   //'a',
        '98':'B',   //'b',
        '99':'C',   //'c',
        '100':'D',  //'d',
        '101':'E',  //'e',
        '102':'F',  //'f',
        '103':'G',  //'g',
        '104':'H',  //'h',
        '105':'I',  //'i',
        '106':'J',  //'j',
        '107':'K',  //'k',
        '108':'L',  //'l',
        '109':'M',  //'m',
        '110':'N',  //'n',
        '111':'O',  //'o',
        '112':'P',  //'p',
        '113':'Q',  //'q',
        '114':'R',  //'r',
        '115':'S',  //'s',
        '116':'T',  //'t',
        '117':'U',  //'u',
        '118':'V',  //'v',
        '119':'W',  //'w',
        '120':'X',  //'x',
        '121':'Y',  //'y',
        '122':'Z',  //'z',
    
        '123':'[',  //'{',
        '124':'\\',  //'|',
        '125':']',  //'}',
        '126':'`'  //'~'           
        // Beyond this they are a bunch of special characters we should not need to worry about
        
    },

    
    _safariSpecialKeyPressMap : {
        '3':"Enter",
        
        '25':"Tab", // This happens with shift+tab

        '63232':"Arrow_Up",
        '63233':"Arrow_Down",
        '63234':"Arrow_Left",
        '63235':"Arrow_Right",

        // Note f8/f9/f10 don't fire an event - cos they take OS focus from the browser
        '64236':"f1", '64237':"f2", '64238':"f3", '64239':"f4", '64240':"f5", '64241':"f6", 
        '64242':"f7", '64243':"f8", '64244':"f9", '64245':"f10", '64246':"f11", '63247':"f12",

        '63273':"Home",
        '63275':"End",
        '63276':"Page_Up",
        '63277':"Page_Down"
    },
    
    
    // _eventHandlerMap - mapping between normal event names and names for internal handler 
    //  functions, eg "mouseDown" -> "handleMouseDown"
    // - Retrieve using "_getInternalHandlerName(event)"
    // - generated on the fly for any event name
    // (See comments in bubbleEvent())
    _eventHandlerMap : {
    },
    
	
    

    //>PluginBridges
    // if there are backMask-requring elements on the page, should we show/hide the backMask on the
    // dragMoveTarget on intersect or just show it all the time?
    //
    // Running intersection tests on every dragMove is expensive, so this is disabled.  Note
    // however, that these intersection tests are required to force correct repainting of
    // Applets obscured by drag and drop in realtime.  But that only happens on older JDKs and
    // can greatly slow down the browser.  See notes in Applet.repaintOnDragStop() for more info.
    dynamicBackMask: false,

    // don't bother to compute what may require backmasking, just always show the backMask.
    // Also useful if the page contains items that require backmasking but that SmartClient
    // doesn't know about - e.g custom iframes.
    alwaysBackMask: false,
    //<PluginBridges

    //>	@classAttr	isc.EventHandler.dragTrackerDefaults (object literal : _lookup_ : IA)
	//		Default properties for the drag tracker.
    // @visibility internal
	//<
    
	dragTrackerDefaults : { 							
			ID:"isc_dragTracker",
            _isDragTracker:true,
			width: 10,									
			height: 10,
            offsetX: -10,
            offsetY: -10,
            autoDraw: false,
            visibility:"hidden",
			overflow:"visible",
			cursor:"arrow"
	},
	
    //>	@classAttr	isc.EventHandler.skipTeasOnXHR	("none", "any", "blockingOnly" : see below : IRWA)
    // Whether we should skip Thread Exit Actions if an XmlHttpRequest has been sent on
    // the current thread.  Valid values are "none", meaning do not skip TEAs; "any", meaning skip
    // TEAs if any kind of XHR has been sent on the current thread; or "blockingOnly", meaning
    // skip TEAs only is a "blocking" XHR has been sent on the current thread.
    //
    // A "blocking" XHR is simply one for which we require a timely response.  It is "blocking" in
    // the sense that delaying the request will block the smooth running of the application; it 
    // is not actually blocking in the sense of waiting synchronously for a response.  A 
    // non-blocking request would be something like a periodic background check, where a timely
    // response is not particularly important to the running of the application.  By default,
    // all requests are blocking; you mark a request as non-blocking by setting the (currently
    // internal) +link{DSRequest.isBlocking,isBlocking} flag explicitly to false on your 
    // +link{class:DSRequest} or +link{class:RPCRequest}.
    //
    // By default, <code>skipTeasOnXHR</code> is set to "blockingOnly" for Internet 
    // Explorer <b>only</b>.  IE does not start sending XmlHttpRequest data until the end of the 
    // Javascript event loop (aka thread), so running tasks as TEAs will delay the sending of any
    // XHRs sent on the current thread by however long those tasks take to complete.  Other 
    // browsers do not suffer from this aberrant behavior - they begin to send XHR data immediately
    // after the xhr.send() call, presumably on a different OS-level thread - so the default for 
    // all browsers other than IE is "none"
    //
    // Note that skipping TEAs causes the tasks that would have run on thread-exit to instead run 
    // on a 0ms timeout
    //
    // @visibility internal
    //<
    skipTeasOnXHR : isc.Browser.isIE ? "blockingOnly" : "none"

}
);// END isc.EventHandler.addClassProperties()

// Add each of the event types in isc.EventHandler.eventTypes directly to the event handler object
isc.EventHandler.addClassProperties(isc.EventHandler.eventTypes);

 
isc.EventHandler.addClassMethods({


handleSyntheticEvent : function (event) {

    var target = event.target;
    event._isSynthetic = true;
    //this.logWarn("synthetic event: " + isc.echoAll(event));

    if (target) {
        event.clientX += target.getPageLeft();
        event.clientY += target.getPageTop(); 
    
        
        if(isc.Browser.isIE) {
            /*
            this.logWarn("left margin: " +  target.getLeftMargin()
                         + " border: " + target.getLeftBorderSize()
                         + " padding: " + target.getLeftPadding());
            */
            event.clientX += target.getLeftMargin() + target.getLeftBorderSize()
                             + target.getLeftPadding() + 2;
            event.clientY += target.getTopMargin() + target.getRightBorderSize() 
                             + target.getTopPadding() + 2;
        }
        /*
        this.logWarn("synthetic event on: " + target.getID() 
                     + " ("+event.type+": "+event.clientX+", "+event.clientY+")");
        */

        switch (event.type) {
            case "mouseup": this.handleMouseUp(event); break;
            case "mousedown": this.handleMouseDown(event); break;
            case "mousemove": this.handleMouseMove(event); break;
        }
    }
},

//>	@classMethod	isc.EventHandler.handleEvent()  (A)
// Routine to handle generic events that are not handled specially 
//	 (currently everything but keyPress, mouseDown, mouseUp, mouseStillDown, mouseMove).
//
//		@group	eventHandling
//
//		@param	target		(object)	Canvas or DOM object that received the event
//		@param	eventType	(string) 	name of this event
//		@param	eventInfo	(any)		information passed with a custom event (see e.g. Slider)
//
//		@return			(boolean)	false == cancel further event processing
//									anything else == continue processing
//      @visibility eventhandler
//<

handleEvent : function (target, eventType, eventInfo) {
    
    this._handlingEvent = eventType;
	
    
        var EH = isc.EH;
    
	// process the event globally
	var returnVal;
  	if (isc.Page.handleEvent(target, eventType, eventInfo) == false) {
  	    returnVal = false;
  	
    // if the target is enabled
	// 	bubble the event up the target's chain
	} else if (EH.targetIsEnabled(target) && EH.bubbleEvent(target, eventType, eventInfo)==false) {
		returnVal =false;
	} else {
	    returnVal = true;
	}
	
	delete this._handlingEvent;
	
	return returnVal;
},


// Handler for the page-level load event.  Internal - developers use Page.setEvent() instead
handleLoad : function (DOMevent) {
    // ensure that SA_Page onload fires before Page's onload handlers.  The History module in
    // particular registers onload handlers that must fire before the Page onload, but because
    // IE's attachEvent() mechanism doesn't fire events in order of registration, we need to
    // kick SA_Page here.
    if (isc.SA_Page) isc.SA_Page._firePageLoadCallbacks();

    if (!isc.Browser.isMoz) {
        
        if (isc.EH._useEventListenerForUnload() && document && document.body) {
            document.body.addEventListener("unload", isc.EH.handleUnload, false);
        }
    }
    
    if (isc.Log.supportsOnError) {
    	return (isc.Page.handleEvent(null, isc.EH.LOAD) != false);
    } else {
        try {
    	    return (isc.Page.handleEvent(null, isc.EH.LOAD) != false);
        } catch (e) {

            isc.Log._reportJSError(e);
            throw e;; // extra semi for Safari
        }
    }
},


// Handler for the page-level unload event.  Internal - developers use Page.setEvent() instead
handleUnload : function (DOMevent) {
	
        var EH = isc.EH;

    var result = (isc.Page.handleEvent(null, EH.UNLOAD) != false);
    
    
    if (result == true) {
        this.releaseEvents();
    }
	return result;
},

//> @groupDef keyboardEvents
// SmartClient allows keyboard events to be captured at the page level via 
// +link{isc.Page.registerKey()} or +link{Page.setEvent()} or at the widget level
// via +link{canvas.keyDown()}, +link{canvas.keyPress()}, and +link{canvas.keyUp}.
// <P>
// Details about the key events can be retrieved via static methods on the EventHandler class
// including +link{isc.EventHandler.getKey()}, +link{isc.EventHandler.getKeyEventCharacter()} and
// +link{isc.EventHandler.getKeyEventCharacterValue()}.
// <P>
// As with other SmartClient event handling code, returning <code>false</code> will suppress the
// default native browser behavior.<br>
// <b>Note:</b> browsers do not allow cancellation of some keys' default behaviors.
// These cases vary by browser, and wherever native cancellation is supported, returning false
// from your event handler should be sufficient to suppress the behavior.
// <br>
// Some specific cases where default behavior cancellation is not always possible include:
// <ul><li>Some function keys (<code>f1, f3, f5,</code> etc) which trigger native browser behavior.
//         [These can be suppressed in Internet Explorer and Mozilla Firefox but not in some other
//          browsers such as Safari / Chrome, etc]</li>
//     <li>Some accelerator key combos such as <code>Alt+f3</code></li>
//     <li>The "Meta" key (the <code>Windows</code> / <code>Apple</code> key to show OS level menu)
//     </li>
// </ul>
// If you do want to include functionality for these keys in your application, we'd recommend 
// testing against your expected users' browser types. It is also worth considering whether by
// changing the functionality of these standard browser keys you may provide an unexpected 
// user experience (for example a user may press "f5" in an attempt to reload the application
// and be surprised by this triggering some alternative functionality in your application).
//
// @treeLocation Concepts
// @visibility external
// @title Keyboard Events
//<





// NOTE: naming: 
// - handleNativeKey*: directly called by DOM
// - handleKey*: called on EH object

// called directly by DOM
_$f10:"f10",
_$Escape:"Escape",
_keyDownKeyNames:[],
_syntheticKeypressFired:{},
_handleNativeKeyDown : function (DOMevent, fromOnHelp) {
	// Some browsers (like Mac IE) have problems dealing with events fired before the page finishes loading.
	//	Just skip key event processing if the page hasn't loaded yet.
    //!DONTCOMBINE
	if (!isc.Page.isLoaded()) return false;
 
    
        var EH = isc.EH;

    
    

    var lastEvent = EH.lastEvent;
    
    if (!DOMevent) DOMevent = EH.getWindow().event;

    // Get the details of the event (stored in EH.lastEvent)
    EH.getKeyEventProperties(DOMevent);

    if (isc.Browser.isIE && lastEvent.keyName == this._$f1 && !fromOnHelp) {
        
        return;
    }
    
    

    var returnVal = true;

    
    var keyName = lastEvent.keyName,
        charValue = lastEvent.characterValue;
        
    //isc.logWarn("In native keydown handler, lastEvent.keyName is " + keyName + 
    //            ", lastEvent.characterValue is " + charValue);
        
    var keyDownKeys = EH._keyDownKeyNames.duplicate();
    for (var i = 0; i < keyDownKeys.length; i++) {
        var prevKeyName = keyDownKeys[i];
        if (prevKeyName == null || prevKeyName == keyName) break;
        
        // skip this if it's a key where we always just fire a synthetic keypress on keyDown
        // since we will have already handled it.
        if (this._fireKeypressOnKeyDown(prevKeyName)) continue;
        
        
        
        
        lastEvent.characterValue = null;
        // copy the previous keyName onto the event so handleKeyPress gets the correct args
        lastEvent.keyName = prevKeyName;
        
        // Fire handleKeyPress with no arguments - this'll fire event handlers based on the
        // specified keyName, and remove it from keyDownKeyNames
        
        this.handleKeyPress();
        EH._syntheticKeypressFired[lastEvent.keyName] = true;
    }
    // We may have changed this to a previously-down keyName in the above loop. reset to the
    // current key.
    lastEvent.keyName = keyName;
    lastEvent.characterValue = charValue;
    
    // the above caught keyDown on another key.. this handles repeated keyDown events for the
    // same key, which should basically fire repeated keypress events.
    var fireSyntheticKeyPress = this._fireKeypressOnKeyDown(keyName);

    if (EH._keyDownKeyNames.indexOf(lastEvent.keyName) != -1) {
        // We can skip this logic if we know we'll fire keyPress (below).
        if (!fireSyntheticKeyPress) {
            returnVal = EH.handleKeyPress();
            EH._syntheticKeypressFired[lastEvent.keyName] = true;
            
            
        }
    } else {
        returnVal = EH.handleKeyDown(DOMevent);
    }

    
    if (returnVal != false && lastEvent.keyName) {
	    EH._keyDownKeyNames[EH._keyDownKeyNames.length] = lastEvent.keyName;
    }
    
    EH._ctrlKeyOnLastUpDown = lastEvent.ctrlKey;
    EH._altKeyOnLastUpDown = lastEvent.altKey;
            
    
    if (returnVal != false && fireSyntheticKeyPress) {
        returnVal = EH.handleKeyPress(DOMevent);
        EH._syntheticKeypressFired[lastEvent.keyName] = true;
    }
    if (returnVal == false) {
        this.cancelKeyEvent(DOMevent);
    }
    return returnVal;
},

// Browser Specific _fireKeypressOnKeyDown() versions:
// for cases where we know we'll have to fire a synthetic keyPress on keyDown:

// default
_fireKeypressOnKeyDown : function (keyName) { return false; },

// Mozilla
_mozFireKeypressOnKeyDown : function (keyName) { 
    // In FF 65 we have to cancel tab focus navigation on keyDown rather than keyPress
    if (isc.Browser.isMoz && isc.Browser.version >= 65) {
        if (keyName == this._$Tab) return true;
    }
    return keyName == this._$f10 && this.shiftKeyDown();
},

// IE
_ieFireKeypressOnKeyDown : function (keyName) { 
    var EH = isc.EH;
    if (EH._nonCharacterKeyMap[keyName] != null) return true;
    // Testing in IE6+ shows that hardly any Ctrl- or Alt- combinations fire a keyPress event, 
    // and those that do, do not suppress native behavior if the custom event code returns 
    // false.  So in IE, we always want synthetic keyPress events for Ctrl- and Alt- combinations
    //return EH._modifierAppliedKeyMap[keyName] != null && EH._modifierKeyDownOnly();
    return EH._modifierKeyDownOnly();
},

// Safari / Chrome non character key
_safariFireKeypressOnKeyDown : function (keyName) { 
    var EH = isc.EH;
    if (EH._safariNonCharacterKeyMap[keyName] != null) return true;
    return EH._modifierAppliedKeyMap[keyName] != null && EH._modifierKeyDownOnly();
},

// internal routine used for deciding whether to generate synthetic keypress
_modifierKeyDownOnly : function (event) {
    if (!event) event = this.lastEvent;
    if (isc.Browser.isMac) return event.metaKey && !event.altKey && !event.shiftKey;
    else return (event.ctrlKey && !event.metaKey && !event.altKey && !event.shiftKey) ||
                (event.altKey && !event.metaKey && !event.ctrlKey && !event.shiftKey);
},

// handleKeyDown() fires the keyDown handler on the event target.
// called in response to document.keyDown _handleNativeKeyDown().

_$Tab:"Tab",
handleKeyDown : function (nativeEvent, scEventProperties) {

    var EH = isc.EH,
        lastEvent = EH.lastEvent,
        returnVal;
    // If the event is handled natively, we will avoid doing any of our own processing and
    // return true to allow native processing
    
    var handledNatively = EH.eventHandledNatively(lastEvent.eventType, lastEvent.nativeKeyTarget);
    if (handledNatively) returnVal = EH._handledNativelyReturnVal;

    if (scEventProperties != null) isc.addProperties(lastEvent, scEventProperties);
    if (!handledNatively) {    
    
        var eventInfo = [lastEvent, lastEvent.target, lastEvent.keyName];
            
        var target = lastEvent.keyTarget;
        //EH.logWarn("nativeEvent: " + EH.echoDOM(nativeEvent) +
        //           ", nativeTarget: " + EH.echoLeaf(lastEvent.nativeTarget));
        //EH.logWarn("lastEvent.target (before re-calling getEventTargetCanvas()):" + target); 
        if (target == null) target = this.getEventTargetCanvas(nativeEvent,
                                                               lastEvent.nativeKeyTarget);
        if (EH.targetIsEnabled(target)) {
            returnVal = (EH.bubbleEvent(target, EH.KEY_DOWN, eventInfo) != false);
        }
    }
    
    return returnVal;
},

// called by DOM
_handleNativeKeyUp : function (DOMevent) {
	// Some browsers (like Mac IE) have problems dealing with events fired before the page finishes loading.
	//	Just skip key event processing if the page hasn't loaded yet.
    //!DONTCOMBINE
	if (!isc.Page.isLoaded()) return false;
    
    var EH = isc.EH,
        lastEvent = EH.lastEvent;
    
    if (!DOMevent) DOMevent = EH.getWindow().event;        
    // get key event properties (stored in EH.lastEvent)
    EH.getKeyEventProperties(DOMevent);
    
    
    EH._ctrlKeyOnLastUpDown = lastEvent.ctrlKey
    EH._altKeyOnLastUpDown = lastEvent.altKey

    
    EH._syntheticKeypressFired[lastEvent.keyName] = null;
        
    
    if (EH._keyDownKeyNames.indexOf(EH.lastEvent.keyName) != -1) {
        if (EH.handleKeyPress(DOMevent) == false) {
            this.cancelKeyEvent(DOMevent);
            return false;
        }
    }
    
    var returnVal = EH.handleKeyUp(DOMevent)
    
    return returnVal
},

// called on EH
handleKeyUp : function (nativeEvent, scEventProperties) {
    var EH = isc.EH,
        lastEvent = EH.lastEvent,
        eventInfo = [lastEvent,  lastEvent.target, lastEvent.keyName];
        
    // If the event is handled natively, return true to allow native processing
    if (EH.eventHandledNatively(lastEvent.eventType, lastEvent.nativeKeyTarget)) {
        // Log.logWarn("keyup event handled natively - bailing");
        return EH._handledNativelyReturnVal;
    }
        

    var returnVal = true;

    if (scEventProperties != null) {
        isc.addProperties(lastEvent, scEventProperties);
    }
    
    var target = lastEvent.keyTarget;
    if (target == null) target = this.getEventTargetCanvas(nativeEvent,
                                                           lastEvent.nativeKeyTarget);

    if (EH.targetIsEnabled(target))
        returnVal = (EH.bubbleEvent(target, EH.KEY_UP, eventInfo) != false);

    
    // On Shift+f10 to show a SmartClient context menu, return false to cancel the keyUp event.
    if (!isc.Browser.isMac && lastEvent.keyName == EH._$f10 && EH.shiftKeyDown() && 	
        isc.Menu && isc.Menu._openMenus && isc.Menu._openMenus.length > 0) 
    {
        returnVal = false;
    }

    // Clear EH.lastEvent's key properties
    EH.clearKeyEventProperties(lastEvent.keyName);
    
    // Return true to allow processing to continue unless something explicitly returned false.
    return returnVal;
},

// called by DOM
_handleNativeKeyPress : function (DOMevent) {
	// Some browsers (like Mac IE) have problems dealing with events fired before the page
    // finishes loading.  Just skip key event processing if the page hasn't loaded yet.
    //!DONTCOMBINE
	if (!isc.Page.isLoaded()) return false;

    
        var EH = isc.EH;

    // We already got the keyEventProperties stored in EH.lastEvent from the keyDown handler
    // However call to getKeyEventProperties required as keyCodes returned in IE are different
    // on keyDown and keyPress.
    
	var lastEvent = EH.lastEvent,
        eventType = EH.KEY_PRESS;

    if (!DOMevent) DOMevent = EH.getWindow().event;
            
    EH.getKeyEventProperties(DOMevent);
        
    
    lastEvent.eventType = eventType;
    // Respect ctrl / alt key state recorded on keyDown/keyUp
    
    lastEvent.ctrlKey = EH._ctrlKeyOnLastUpDown;
    lastEvent.altKey = EH._altKeyOnLastUpDown;
    
    //isc.logWarn("In native keyPress handler for key " + lastEvent.keyName + ". eventType is " + eventType + ", Ctrl is " + (lastEvent.ctrlKey ? "down" : "up"));
    
    
    if (EH._syntheticKeypressFired[lastEvent.keyName] == true) {
        
        // Remove the flag - if we get a second native keyPress event we do want to fire the
        // handler (implies the key is being held down!)
        EH._syntheticKeypressFired[lastEvent.keyName] = null;
        return;
    }
    
    var returnVal = EH.handleKeyPress(DOMevent);
    if (returnVal == false) {
        this.cancelKeyEvent(DOMevent);
    }
    return returnVal;

},

// cancelKeyEvent
// Fired when a key event handler returns false
// We use this to suppress native key event handling behavior where returning false from 
// the native event isn't sufficient.

_IECanSetKeyCode:{keydown:true,  keyup:true, keypress:true},
cancelKeyEvent : function (DOMevent) {
    
    
    if (isc.Browser.isIE || isc.Browser.isSafari) {
        
        if (this._IECanSetKeyCode[DOMevent.type] == true) {
            
            try {
                DOMevent.keyCode = 0;
            } catch (e) {
            }
        }
    }

},

// called on EH 
handleKeyPress : function (nativeEvent, scEventProperties) {
    // We already got the keyEventProperties stored in EH.lastEvent from the keyDown handler
    // However call to getKeyEventProperties required as keyCodes returned in IE are different
    // on keyDown and keyPress.
	var EH = isc.EH,
        lastEvent = EH.lastEvent,
        eventType = EH.KEY_PRESS;

    // if passed already-derived event properties, apply them to the EH.lastEvent.
    if (scEventProperties != null) {
        isc.addProperties(lastEvent, scEventProperties);
    } 
    
    
    var eventInfo = {keyName:lastEvent.keyName, characterValue:lastEvent.characterValue};
       
    // update the eventType since this may be a synthetically generated keyPress event (from
    // keyUp or repeated keyDown events).
    lastEvent.eventType = eventType;
    
    
    EH._keyDownKeyNames.removeAt(0);

	// call the global keyPress event (Set up via Page.setEvent("keyPress",...) )
	if (isc.Page.handleEvent(lastEvent.keyTarget, eventType) == false) return false;
    // If eventHandledNatively returns true don't fire widget level handlers, or allow 
    // registered keys to fire their actions.
	// NOTE: in IE, this will return the key number so we pass that value on
	var it = (EH.eventHandledNatively(eventType, lastEvent.nativeKeyTarget));
    
	if (it !== false) {
        //>DEBUG
        EH.logDebug("keyPress handled natively");
        //<DEBUG
        return EH._handledNativelyReturnVal;
        
    } else {
        //>DEBUG
        EH.logDebug("keyPress not handled natively");
        //<DEBUG
    }
    
    var target = lastEvent.keyTarget;
    if (target == null) target = this.getEventTargetCanvas(nativeEvent,
                                                           lastEvent.nativeKeyTarget);
    // Pass to the appropriate widget, and stop if this returns false.
    if (EH.targetIsEnabled(target)) {
        var handlerReturn = EH.bubbleEvent(target, lastEvent.eventType, eventInfo) 
        if (handlerReturn == false) return false;
    }

    
	if (handlerReturn != EH.STOP_BUBBLING 
        && isc.Page.handleKeyPress() == false) return false;
        

    // If we got a tab or shift-tab keypress, and we're showing a hard mask, explicitly stick
    // focus into the next widget in the page's tab order that isn't masked.
    
    if (this.clickMaskUp() && lastEvent.keyName == this._$Tab) {
        var topHardMask,
            registry = this.clickMaskRegistry;
        for (var i = registry.length-1; i >=0; i--) {
            if (this.isHardMask(registry[i])) {
                topHardMask = registry[i];
                break;
            }
        }
        if (topHardMask != null) {
            var focusCanvas = EH._focusCanvas;

            if (focusCanvas != null) {
            
                //>DEBUG
                this.logInfo("Telling focus canvas:" + focusCanvas + " to shift focus", 
                            "syntheticTabIndex")
                //<DEBUG
                focusCanvas._focusInNextTabElement(!this.shiftKeyDown(), topHardMask);
            } else {
                if (this.shiftKeyDown()) {
                    //>DEBUG
                    this.logInfo("Putting focus into last widget in response to Tab keydown",
                                "syntheticTabIndex")
                    //<DEBUG
                
                    this._focusInLastWidget(topHardMask);
                } else {
                    //>DEBUG
                    this.logInfo("Putting focus into first widget in response to Tab keydown",
                                "syntheticTabIndex")
                    //<DEBUG
                    this._focusInFirstWidget(topHardMask);
                }
            }
            // Always return false natively in this case - we don't want the focus to shift again
            return false;
        }
    }
    

    
    
    if (lastEvent.keyName == isc.EH._$f10 && isc.EH.shiftKeyDown()) {
        var returnVal = this.handleContextMenu(nativeEvent, true);
        
        if (isc.Browser.isIE && returnVal) {
            this._contextMenuShown = true;
        }
        return returnVal;
    }
    
    // In Moz hitting "Escape" during server turnaround (either XMLHttpRequest, or iframe)
    // kills the communication.
    // Avoid this by suppressing native Escape behavior during active comm.
    
    // Note: Opera has the same bug if using hidden frames (though not XMLHttpRequest)
    // but returning false from the Escape keypress doesn't resolve the issue in that browser.
    if (isc.Browser.isMoz &&
        isc.RPCManager && isc.RPCManager._activeTransactions.length > 0
        && lastEvent.keyName == isc.EH._$Escape) 
    {
        return false;
    }
    
	// return true to allow normal event processing unless anything explicitly returned false
	return true;
},
// Helper methods to put focus at the beginning or end of our managed tab-index.
_focusInFirstWidget : function (mask) {
    var widget = this._firstTabWidget;
    if (widget) {
        if ((!mask || !this.targetIsMasked(widget, mask)) && 
              widget.isDrawn() && widget.isVisible() && !widget.isDisabled() && 
              widget._canFocus()) 
        {
            // Call 'focusAtEnd()' rather than focus()
            // if the widget manages the tab index of sub elements (EG DynamicForm), we want
            // to notify it to put focus in the first sub element.
            widget.focusAtEnd(true);
        } else {
            widget._focusInNextTabElement(true, mask);
        }
    }
},
_focusInLastWidget : function (mask) {
    var widget = this._lastTabWidget;
 
    if (widget) {
        if ((!mask || !this.targetIsMasked(widget, mask)) && 
             widget.isDrawn() && widget.isVisible() && !widget.isDisabled() && 
             widget._canFocus()) 
        {
            widget.focusAtEnd();
        } else {
            widget._focusInNextTabElement(false, mask);
        }            
    }
},

handleMouseLeaveDocument : function (DOMevent) {
    
        var EH = isc.EH;

    

    EH._mouseWasDownWhenLeftDocument = !!EH._mouseIsDown;
},

//>	@classMethod	isc.EventHandler.handleMouseDown()
//			Special handler for mouseDown events.
//          Starts a timer to fire mouseStillDown if the target implements it.
//			sets the following variables for use in subsequent events
//				...
//
//		@group	mouseEvents
//		@param	DOMevent	(DOM event) DOM event object (as passed by isc.EventHandler)
//
//		@return				(boolean)	false == cancel native event processing
//										anything else == continue native event processing
//  @visibility internal
//<
handleMouseDown : function (DOMevent, syntheticEvent) {

    // In touch environments (iPhone etc), we respond to onTouchStart / onTouchStop events
    // and use these to fire our mouseDown/up/click events.
    // This is required to support drag/drop as the mouseDown/up series of events fires
    // after the touchStop event.
    // Simply no-op from the native mouseDown / Up etc event handlers so we don't get
    // doubled events and unpredictable behavior
    
    if ((isc.Browser.isTouch || navigator.pointerEnabled) && !syntheticEvent) return;

	
        var EH = isc.EH;

    EH._handlingMouseDown = true;
    var returnValue = EH.doHandleMouseDown(DOMevent, syntheticEvent);
    EH._handlingMouseDown = false;
    
    return returnValue;
},



_$IMG:"IMG",
_$alphaImgFilter:"progid:DXImageTransform.Microsoft.AlphaImageLoader",
doHandleMouseDown : function (DOMevent, syntheticEvent) {
	// Some browsers (like Mac IE) have problems dealing with events fired before the page finishes loading.
	//	Just skip mouse event processing if the page hasn't loaded yet.
	if (!isc.Page.isLoaded()) return false;

	var EH = this;

	// note that the mouse is down.  We do this BEFORE getting event properties to work around a bug
	// in Nav where the event.which (property to get the mouse button) is reported as 1 on a
	// mouseMove, even when the mouse is actually not pressed.
	EH._mouseIsDown = true;

    
    EH._firedSyntheticMouseUp = null;
    
	// get the properties of the event
    
    var event = syntheticEvent || EH.getMouseEventProperties(DOMevent);

    // if we switched event target, get rid of the focus
    
    var focusCanvas = EH._focusCanvas,
        forceBlur = focusCanvas != null &&
                    (focusCanvas != event.target) && !focusCanvas._useNativeTabIndex && 
                    !focusCanvas._useFocusProxy && 
                    !(isc.isA.DynamicForm!=null && isc.isA.DynamicForm(focusCanvas) && focusCanvas.getFocusSubItem() 
                      && focusCanvas.getFocusSubItem().hasFocus);
    if (forceBlur) {
        // In IE if we blur() here, the thing we clicked on never gets native focus (not clear 
        // why), so do this on a timeout, if appropriate
        if (isc.Browser.isIE) {
            var ID = EH._focusCanvas.getID();
            
            if (EH._delayedBlurArray == null) 
                EH._delayedBlurArray = ["if (", ID, " && ", ID, ".hasFocus)", ID, ".blur();"]
            else 
                EH._delayedBlurArray[1] = EH._delayedBlurArray[3] = EH._delayedBlurArray[5] = ID;
            isc.Timer.setTimeout(
                EH._delayedBlurArray.join(isc.emptyString),
                0
            );
            
        } else {
            EH._focusCanvas.blur();
        }
    }        

    
	// remember a copy of the event particulars as mouseDownEvent
	EH.mouseDownEvent = isc.addProperties({}, event);
	
	// get the target Canvas
	var target = event.target;
    // handle mouseDown on the virtual click mask, if it's showing.  
    // If this is an hard clickMask, the click action will be cancelled by the
    // mask - since we actually do this on mouseDown, we need to set a flag to also
    // cancel mouseUp when it happens.
    
    
    var targetIsMasked = (EH.clickMaskClick(target) == false);
	if (targetIsMasked) {
        EH.__cancelNextMouseUp = true;
        
        // In Chrome, if the user clicks the scrollbar track/thumb of the page, if we
        // we return false from mouseDown, native scrolling is disallowed.
        // Catch this case and avoid killing the event
        if (isc.Browser.isChrome) {
            var sbWidth =  isc.Element.getNativeScrollbarSize();
            var pageHeight = isc.Page.getHeight(),
                pageWidth = isc.Page.getWidth(),
                hasHSB = isc.Page.getScrollWidth() > isc.Page.getWidth(),
                hasVSB = isc.Page.getScrollHeight() > isc.Page.getHeight();
            
            // Note that getWidth() reports size *inside* scrollbars
            // so we don't need to look at isc.Element.getNativeScrollbarSize() here
            // getHeight() reports size including space under scrollbars so we do need
            // to adjust there.
            if (hasHSB && isc.EH.getY() > (pageHeight - sbWidth) + isc.Page.getScrollTop()) {
                return true;
            }
            if (hasVSB && isc.EH.getX() > pageWidth + isc.Page.getScrollLeft()) {
                return true;
            }
        }
        return false;
    } else {
        // explicitly set the flag to NOT cancel the next mouseUp - this is required to note that 
        // we've fired the clickMaskClick()
        // See comments in handleMouseUp() for more details
        EH.__cancelNextMouseUp = false;
    }

    // NOTE: although we do send a rightMouseDown, we don't send a rightMouseMove or rightMouseUp at
    // the moment.  rightMouseDown is needed to implement a record or cell selection model that
    // matches Windows Explorer and Excel respectively - rightMouseMove and rightMouseUp are more
    // exotic.
    var eventType = EH.rightButtonDown() ? EH.RIGHT_MOUSE_DOWN : EH.MOUSE_DOWN;
	// call the global mouseDown handler
	if (isc.Page.handleEvent(target, eventType) == false) {
        return false;
    }

	// see if we shouldn't pass this event on to DOM object, and return true if we should
	if (EH.eventHandledNatively(eventType, event.nativeTarget)) 
        return EH._handledNativelyReturnVal;

	// if the target is not enabled, we shouldn't continue
    if (!EH.targetIsEnabled(target)) return false;
    
    var forceIEFocusTarget;
    
    if (target && !target.hasFocus) {
        // call 'focus' to focus on the widget.
    
        
        
        if ( ((isc.Browser.isMoz && target.canSelectText) || isc.Browser.isSafari )
             && target._useFocusProxy )
        {
            EH.focusInCanvas(target);
            
        
        } else if (!target._useNativeTabIndex) {
            target.focus("focus on mousedown");
        
        } else if (isc.Browser.isMoz || isc.Browser.isSafari) {
            target.focus("focus on mousedown");
        
        
        } else if (isc.Browser.isIE) {
            
            var nativeElement = event.nativeTarget;
            if (isc.Browser.isStrict) {
                forceIEFocusTarget = target;
            } else {
                if (nativeElement && nativeElement.tagName == this._$IMG) {
                    var style = nativeElement.style,
                        filter = style ? style.filter : null;
                    if (filter.contains(this._$alphaImgFilter)) {
                        forceIEFocusTarget = target;
                    }
                }
            }
        }
    } 
    
    // NOTE that we allow right drag, and treat it just like left drag, although you can do
    // something special on right drag by checking EH.rightButtonDown()
    if (target) EH.prepareForDragging(target);
    
    // bubble the mouseDown event to anyone who wants it
    var handlerReturn = EH.bubbleEvent(target, eventType, null, targetIsMasked);
    if (forceIEFocusTarget != null) forceIEFocusTarget.focus();
    
	if (handlerReturn == false) {
        // a an explicit "false" returned from mouseDown will cancel dragging
        delete EH.dragTarget;
        delete EH.dragTargetLink;
    }

	// if the right button is down, the return value can affect the context menu.
    // In DOM browsers, we receive a native showContextMenu event (see
    // this.handleContextMenu()), and our response to that affects whether the context
    // menu will be shown.
	if (EH.rightButtonDown()) {
        // Bail unless we're in a browser where we never get a separate right-mouse event
        if (!this.useSyntheticRightButtonEvents()) return true;

        
        if (target && 
            (EH.getBubbledProperty(target, "contextMenu") || 
             EH.getBubbledProperty(target, "showContextMenu", true) != isc.Canvas.getInstanceProperty("showContextMenu")))
        {
        
			// return false to suppress native context menu, since we'll show our own on mouseUp
            //this.logWarn("rightMouseDown: false");
            event.returnValue = false;
			return false;
		}
        // return true to allow the context menu in Nav4.  Note that when we return true here, we
        // never get mouseUp in Nav4.
        //Log.logWarn("rightMouseDown: true");
        return true;
	}
    // if the mouseDown handler didn't return false, set up a timer to send mouseStillDown events
	if (handlerReturn != false) {	
            // if the target or a parent has a mouseStillDown message fire the mouseStillDown event,
            // this will keep firing on a timer until the mouse goes up
            if (EH.hasEventHandler(target, EH.MOUSE_STILL_DOWN)) {
                // call _handleMouseStillDown, which will start the timer. 
                EH._handleMouseStillDown(true);
            }

	}

    

    var aboutToDrag = EH.dragTarget != null && EH.dragOperation != EH.DRAG_SELECT;

    // Return false to cancel native drag mode if we're about to do an ISC drag.
    // Return false in Moz if text selection is diallowed    
    // (type-casting target._allowNativeTextSelection() to a boolean - if this 
    // returns undef we want to  return an explicit false so drag selection is disallowed)
    // Don't return false if we're handling a touch event because this cancels native touch
    // scrolling.
    // Also return false if app code returned false
    
    var returnVal = handlerReturn == false ? false : 
                    (isc.Browser.hasNativeDrag && target._getUseNativeDrag()) ||
                    (!aboutToDrag && 
                     (!(isc.Browser.isMoz || isc.Browser.isSafari) || 
                      !!target._allowNativeTextSelection(event)));
    return returnVal;
},

//>	@classMethod	isc.EventHandler.stillWithinMouseDownTarget()
//	Is the current event still within the last Canvas where the mouse went down?
//  Note: You need to call this method to get correct cross-platform determination of whether
//        the current event is still within the mouseDown target.
//		@group	mouseEvents
// @visibility internal
//<

stillWithinMouseDownTarget : function () {
    var mouseDownTarget = this.mouseDownTarget();
    if (!mouseDownTarget) return false; // mouse didn't go down in a Canvas

    var lastEvent = this.lastEvent;

    // see if we're within the same Canvas that the mouse went down in
    var stillWithin = (mouseDownTarget == lastEvent.target);
    if (!stillWithin) return false;

    if (lastEvent._stillWithin != null) return lastEvent._stillWithin;

    return stillWithin;
},

//>	@classMethod	isc.EventHandler.handleMouseMove()
// Starts dragging if the dragTarget is set and the mouse has moved more than [5] pixels
//	
// Sets the dropTarget if we're dragging and are over a droppable target
//
// Generates mouseOver/mouseOut or dragOver/dragOut events on Canvas boundaries.
//
//		@group	mouseEvents
//
//		@param	DOMevent	(DOM event) DOM event object (as passed by isc.EventHandler)
//
//		@return				(boolean)	false == cancel native event processing
//										anything else == continue native event processing
// @visibility internal
//<
// called directly by DOM
handleMouseMove : function (DOMevent) {

    // Some browsers (like Mac IE) have problems dealing with events fired before the page
    // finishes loading.  Just skip mouse event processing if the page hasn't loaded yet.
	if (!isc.Page.isLoaded()) return false;
    
        var EH = isc.EH;

    // No-Ops in Touch environments
    // (See comments in handleMouseDown for why we do this)
    if (!EH.nativeDragging && (isc.Browser.isTouch || navigator.pointerEnabled)) return;

    
    if (EH._handlingMouseDown || EH._handlingMouseUp) return;

	var event = EH.getMouseEventProperties(DOMevent);

    
    if (EH._needMissedMouseupOutsideWindowWorkAround &&
        EH._mouseWasDownWhenLeftDocument != null)
    {
        if (EH._mouseWasDownWhenLeftDocument) {
            // If the mouse is no longer down, then fire a synthetic mouseUp.
            if (event.buttonNum == 0) {
                EH.handleMouseUp(DOMevent, true);
            }
        }
        EH._mouseWasDownWhenLeftDocument = null;
    }

    
    if ((isc.Browser.isMoz || isc.Browser.isIE)
        
        && !EH.immediateMouseMove
        
        && !EH.nativeDragging
    ) {
        //Log.logWarn("postponing mouseMove (last time: " + EH.lastMouseMoveTime + 
        //            " exceeds threshold of " + EH.delayThreshold);
        // set a timer to fire mouseMove later
        if (EH.delayedMouseMoveTimer == null) {
            EH.delayedMouseMoveTimer = 
                 isc.Timer.setTimeout({target:EH, methodName:"_delayedMouseMove",
                                       args:[isc.timeStamp()]}, 0, true);
        }
        
        
        return true;
    }

    
    var result = EH._handleMouseMove(DOMevent, event);
    
    return result;
},

_delayedMouseMove : function (ts) {
    //var now = isc.timestamp();
    //if ((now - ts) > 30) {
    //    this.logWarn("long timer firing delay: " + (now-ts) + "ms");
    //}

    this.delayedMouseMoveTimer = null;

    //var start = isc.timeStamp();
    this._handleMouseMove(null, this.lastEvent);
    //var end = isc.timeStamp();

    //if ((end - start) > 5) {
    //    this.logWarn("long mouse move: " + (now-ts) + "ms");
    //}
},


_handleMouseMove : function (DOMevent, event) {
    this._handlingMouseMove = true;
    var returnVal = this.__handleMouseMove(DOMevent, event);
    this._handlingMouseMove = null;
    return returnVal;
},

__handleMouseMove : function (DOMevent, event) {
    var EH = this;

    var mouseDown = EH.mouseIsDown();

    // We might start dragging if:
    // - the mouse is down
    // - the mouse went down on a Canvas that allows dragging (EH.dragTarget, set up in 
    //   prepareForDragging)
    // - the Canvas does not have useNativeDrag:true
    // - we're not already dragging
    // - there are no open menus (since showing a context menu and handling a drag operation are
    //   mutually exclusive)
    var mightStartDrag = (mouseDown &&
                          EH.dragTarget &&
                          (!isc.Browser.hasNativeDrag || !EH.dragTarget._getUseNativeDrag()) &&
                          !EH.dragging &&
                          (!(isc.Menu && isc.Menu._openMenus && isc.Menu._openMenus.length > 0) ||
                          		EH.dragTarget._isScrollThumb ||
                          		isc.isA.Menu(EH.dragTarget) ));

    
    var missedMouseUp;
    if (isc.Browser.isIE && event.originalType !== EH.POINTER_MOVE) {
        var buttonNum = event.buttonNum;
        if (mouseDown) {
            
            if (!mightStartDrag && buttonNum == 0) {
                if (EH.dragging) {
                    
                } else {
                    missedMouseUp = true;
                }
            }
        
        } else if (buttonNum == 1 && event.eventType == EH.MOUSE_MOVE) {
            if (EH._firedSyntheticMouseUp) {
                
            } else {
                event.eventType = EH.MOUSE_DOWN;
                EH.handleMouseDown(null, event);
                event.eventType = EH.MOUSE_MOVE;
            }
        }
    }

    
 	var target = event.target,
 		isNative = EH.eventHandledNatively(EH.MOUSE_MOVE, event.nativeTarget)
 	;
    
	if (EH._mouseIsDownInScrollbar) {
        
        EH.handleMouseUp(DOMevent, true);
    
    } else if (missedMouseUp) {
        EH.logInfo("sythesizing mouseUp " +
                (EH._outOfWindow ? 
                    "due to mouseUp outside window," : 
                    
                    "[buttonNum cleared on mouseMove with no mouseUp event],") +
                " buttonNum: " + 
                   event.buttonNum);
        EH.handleMouseUp(DOMevent, true);
    }
    delete EH._outOfWindow;

    // If we synthesized a mouseUp() event, then update the `mightStartDrag' and `mouseDown'
    // local variables.
    if (!EH.mouseIsDown()) {
        mightStartDrag = mouseDown = false;
    }

    

    // NOTE: we allow right mouse button dragging, and at the EventHandler level we treat it
    // just like normal dragging, however, a specific drag handler can implement special
    // semantics for right dragging.

    
    if (isc.Browser.isMoz && (isc.Browser.geckoVersion < 20100914) && mouseDown &&
        event.target && event.target._useMozScrollbarsNone 
        && event.target != EH.mouseDownTarget()) 
    {
        event.nativeDraggingTarget = event.nativeTarget;
        event.nativeTarget = null;
        target = event.target = EH.mouseDownTarget();
    }

    // start dragging if:
    // - `mightStartDrag' is true
    // - the mouse has moved a certain distance, in either direction, from the mouseDown point
    if (mightStartDrag &&
        (Math.abs(event.x - EH.mouseDownEvent.x) > EH.dragTarget.dragStartDistance ||
         Math.abs(event.y - EH.mouseDownEvent.y) > EH.dragTarget.dragStartDistance))
    {
        EH.handleDragStart();
    }

	// if we're dragging, jump over to handleDragMove which does special processing
	if (EH.dragging) {
	    return EH.handleDragMove();
	}
	// if the right button is down
	if (EH.rightButtonDown()) {
		// don't send mouseMove.  We could send a 'rightMouseMove' event, but we've decided not
        // to do that now.
        
        
        if (!isc.Browser.isMac || !EH.ctrlKeyDown()) return true;
	}
  
    
	if (mouseDown) {
        target = EH.stillWithinMouseDownTarget() ? EH.mouseDownTarget() : null;
	} else {
		target = event.target;
	}

	// if the target is not the last object that got the move event,
	// send the mouseOut and mouseOver routines to the appropriate objects
	if (target != EH.lastMoveTarget) {
        //>DEBUG
        if (this.logIsDebugEnabled()) {
            this.logDebug((EH.lastMoveTarget ? 
                           "mousing out of " + EH.lastMoveTarget + "  " : "") +
                           (target ? "mousing over " + target : ""));
        }
        //<DEBUG
		// send the mouseOut event to the last mover object
        var lastMoveTarget = EH.lastMoveTarget,
            hoverTarget,
            lastHoverTarget = EH.lastHoverTarget;

        if (lastMoveTarget) {
            delete EH.lastMoveTarget;
            EH.handleEvent(lastMoveTarget, EH.MOUSE_OUT);
        }

        // send the mouseOver event to the target
        if (target) {
            
            var hoverResult = EH.handleEvent(target, EH.MOUSE_OVER);
            // use 'getHoverTarget()' to determine which widget should receive a hover event.
            if (hoverResult != false) hoverTarget = target.getHoverTarget(event);
        }

        // Send hover events to the hover target/last hover target.
        // The Canvas level implementation handles actually setting up timers to fire 
        // user-visible hover handlers.
        if (hoverTarget != lastHoverTarget) {
            if (lastHoverTarget) lastHoverTarget.stopHover();
            if (hoverTarget) hoverTarget.startHover();
            
            EH.lastHoverTarget = hoverTarget;
        }

		// remember that we're the last move object
		EH.lastMoveTarget = target;
	}

	// call the global event handler
	if (isc.Page.handleEvent(target, EH.MOUSE_MOVE) == false) return false;

	// see if we shouldn't pass this event on to DOM object, and return true if we should
	if (isNative) return EH._handledNativelyReturnVal;

	// if the target isn't defined or isn't enabled, return false
	if (!EH.targetIsEnabled(target)) return false;

	// bubble the event
	EH.bubbleEvent(target, EH.MOUSE_MOVE);

    // update the cursor
	if (target) target._updateCursor();
    	
    
    return true;
    
},

//> @classMethod isc.EventHandler.getNativeMouseTarget() [A]
// Returns the natively reported target (or source) DOM element for the current mouse event.
// <b>NOTE:</b> SmartClient cannot guarantee that the same element will
// be reported in all browser/platform configurations for all event types.
// If you wish to make use of this value, we recommend testing your use case 
// in all target browser configurations.
//
// @return (HTML Element) native DOM element over which the mouse event occurred
// @visibility external
//<
// Common known issue - during drag/drop interactions some browsers may report
// the mouse down target (the target being dragged) rather than the target the user is currently
// hovering over.

getNativeMouseTarget : function (event) {
    if (!this.nativeTargetWarningLogged) {
        this.nativeTargetWarningLogged = true;
        this.logWarn("getNativeMouseTarget(). This method will return the DOM element " +
            "the browser reports as the target or source of the current mouse event. " +
            "Please note that SmartClient cannot guarantee that the same element will " +
            "be reported in all browser/platform configurations for all event types. " +
            "If you wish to make use of this value, we recommend testing your use case " +
            "in all target browser configurations.");
            
    }
    if (event == null) event = this.lastEvent;
    return event.nativeTarget || event.nativeDraggingTarget;
    
},


// handle a native mouseOut event
handleNativeMouseOut : function (DOMevent) {
    // we generally synthesize the mouseOut event during mouseMove.  However, for the special
    // case of mousing out of the browser window via exiting a Canvas which is which is flush
    // with the window border, we'll never get a mouseMove outside of our Canvas, so we have to
    // detect this case specially.

    
    if (isc.Browser == null) return;

	
        var EH = isc.EH;

    
    if (EH._handlingMouseDown || EH._handlingMouseUp) return;

    var event = (DOMevent ? DOMevent : EH.getWindow().event),
		target = (isc.Browser.isDOM ? event.target : event.srcElement),
        leavingWindow = false;

    if (isc.Browser.isIE) {
        
        leavingWindow = (event.toElement == null);
        
    } else {
        
        leavingWindow = (event.relatedTarget == null);
        
    }

    //EH.logWarn("leaving window:" + leavingWindow + ", lastMoveTarget: " + EH.lastMoveTarget);

    // used for detecting mouseUps that happen outside the window, where possible
    if (leavingWindow) EH._outOfWindow = true;   

    var lastMoveTarget = EH.lastMoveTarget;
    if (leavingWindow && lastMoveTarget) {
        // Update properties on the lastEvent object before bubbling handlers.
        
        EH._updateMouseOutEventProperties(event);
        delete EH.lastMoveTarget;
        EH.handleEvent(lastMoveTarget, EH.MOUSE_OUT);
        if (EH.lastHoverTarget) {
            EH.lastHoverTarget.stopHover();
            delete EH.lastHoverTarget;
        }
    }
},


// update lastEvent with properties from a native 'mouseOut' event.
_updateMouseOutEventProperties : function (nativeEvent) {
	
        var EH = isc.EH;

    var lastEvent = EH.lastEvent;

    // Store the target we're moving into as the event target (rather than the target we're
    // moving out of!)
    if (isc.Browser.isIE) {
        lastEvent.nativeTarget = nativeEvent.toElement;    
    } else {
        lastEvent.nativeTarget = nativeEvent.relatedTarget;
    }

    if (lastEvent.nativeTarget == null) lastEvent.target = null
    else lastEvent.target = this.getEventTargetCanvas(nativeEvent, lastEvent.nativeTarget);    
},



// Send the mouseDown target a periodic, synthetic "still down" event while the mouse stays
// down
//
// Allows for things like repeated scrolling while the mouse button is held down in
// scrollbar buttons.
//
// NOTE: mouseStillDown is also fired once immediately on mouseDown
_handleMouseStillDown : function (handlingMouseDown,timeStamp) {
	// Some browsers (like Mac IE) have problems dealing with events fired before the page
    // finishes loading.  Just skip mouse event processing if the page hasn't loaded yet.
	if (!isc.Page.isLoaded()) return false;
	var EH = this;
	
	// clear the old timeout if necessary
    EH._stillDownTimer = isc.Timer.clear(EH._stillDownTimer);
	
	// if the mouse is already up, or the mouseDownTarget can no longer be found, bail
    
	if (!EH.mouseIsDown() || !EH.mouseDownTarget()) return false;
	
	// send the event up the chain of the target
	if (EH.bubbleEvent(EH.mouseDownTarget(), EH.MOUSE_STILL_DOWN) == false) return false;
    
	// start the timer to call this again after a delay.  
    
    var target = EH.mouseDownTarget(),
        delay = handlingMouseDown ? target.mouseStillDownInitialDelay :
                                          target.mouseStillDownDelay;
  	EH._stillDownTimer = this.delayCall("_handleMouseStillDown", [], delay);

    // alternate code that allows checking the actual delay before the timer fired
    //if (!this._handlingMouseDown) {
    //    this.logWarn("mouseStillDown fired after: " + (isc.timeStamp() - timeStamp) + "ms");
    //}
  	//EH._stillDownTimer = 
    //    isc.Timer.setTimeout("isc.EH._handleMouseStillDown(false," + isc.timeStamp() + ")", delay);

	return true;
},



//>	@classMethod	isc.EventHandler.handleMouseUp()
//			Special handler for mouse up events.
//
//			fires  showContextMenu, click and doubleClick events as necessary
//
//		@group	mouseEvents
//		@param	DOMevent	(DOM event) DOM event object (as passed by isc.EventHandler)
//
//		@return				(boolean)	false == cancel native event processing
//										anything else == continue native event processing
//  @visibility internal
//<
// called directly from DOM, and by other methods
handleMouseUp : function (DOMevent, fakeEvent) {

    
	
        var EH = isc.EH;

    // No-Ops in Touch environments
    // (See comments in handleMouseDown for why we do this)
    if (!EH.nativeDragging && (isc.Browser.isTouch || navigator.pointerEnabled) && !fakeEvent) return;

    
    if (isc.Browser.isIE && !EH._mouseIsDown) {
    
        
        if (EH._firedSyntheticMouseUp) return;
    
        var lastEvent = EH.lastEvent;
        lastEvent.eventType = EH.MOUSE_DOWN;
        EH.handleMouseDown(null, EH.lastEvent);
    }
    EH._firedSyntheticMouseUp = fakeEvent && EH._mouseWasDownWhenLeftDocument == null;

    
    if (!fakeEvent) EH._handlingMouseUp = true;
    var returnValue = EH._handleMouseUp(DOMevent, fakeEvent);
    EH._handlingMouseUp = false;

    
    if (isc.Browser.isSafari) returnValue = true;
    
    
    
    
    return returnValue;
},
_handleMouseUp : function (DOMevent, fakeEvent) {

    // Some browsers (like Mac IE) have problems dealing with events fired before the page
    // finishes loading.  Just skip mouse event processing if the page hasn't loaded yet.
	if (!isc.Page.isLoaded()) return false;
	var EH = this,
		// get the properties of the event
		event = (!fakeEvent ? EH.getMouseEventProperties(DOMevent) : EH.lastEvent),
		isNative = false;
    
	EH._mouseIsDown = false;
	delete EH.__handleClickReturnValue;
	
	// clear the stillDownTimer
	EH._stillDownTimer = isc.Timer.clear(EH._stillDownTimer);

    // switch focus if the one-time flag has been set
    var focusTarget = EH._delayedFocusTarget;

    if (focusTarget) {
        //EH.logWarn("focusing in delayed target:" + focusTarget);
        focusTarget.focus();
        EH._delayedFocusTarget = null;
    }

    // EH.__cancelNextMouseUp is a one-time flag to cancel mouseUp.  
    // This is used when, on mouseDown, you want to cancel the entire click.
    // We set this flag to true on mouseDown if the target is masked and the clickEvent for the
    // click mask returned false.

    // Remember this flag's value, and clear it
    var cancelMouseUp = EH.__cancelNextMouseUp;
    EH.__cancelNextMouseUp = null;

    
    var targetIsMasked;
    if (cancelMouseUp == null) {
        cancelMouseUp = (EH.clickMaskClick(event.target) == false);
        targetIsMasked = cancelMouseUp;
    }

    // Return if cancelling the mouseUp
    if (cancelMouseUp == true) {
        if (EH.logIsDebugEnabled()) EH.logDebug("mouseUp cancelled by clickMask");
        return false;
    }
    
    var successfulDrag = false;
    // if we're dragging, stop dragging.  NOTE: this applies to right button down as well,
    // which is treated as normal dragging.
    if (EH.dragging) {
        successfulDrag = EH.handleDragStop();
    }

	// right mouse button just came up, it's a right click (handleContextMenu())
	if (EH.rightButtonDown(event)) {
        
		if (this.useSyntheticRightButtonEvents()) {
			EH.handleContextMenu();
		}

		// suppress the click event
		EH.__handleClickReturnValue = false;
	
	} else {
        // only send mouseUp and click if drag was unsuccessful (or never started)
        // NOTE: it's very important to send mouseUp and click if drag wasn't successful, 
        // because among other problems, frequently a D&D interaction will be triggered by a 
        // sloppy click where there is a small distance between mouseDown and mouseUp, and 
        // then the click will appear to have mysteriously failed.

         
        
        if (!successfulDrag) {            
            if (isc.Page.handleEvent(event.target, EH.MOUSE_UP) != false) {                

                var mouseUpReturn = true, 
                    x = this.lastEvent.x, y = this.lastEvent.y,
                    mouseDownTarget = EH.mouseDownTarget();

                isNative = EH.eventHandledNatively(EH.MOUSE_UP, event.nativeTarget);
                if (!isNative && EH.targetIsEnabled(mouseDownTarget)) {
                    if (mouseDownTarget.visibleAtPoint(x, y)) {
                        mouseUpReturn = EH.bubbleEvent(mouseDownTarget, EH.MOUSE_UP, null, 
                                targetIsMasked);

                    // On touch-enabled devices, we might not get another event for a while.
                    // If we're in the middle of handling the end of a touch event sequence,
                    // then fire mouseOut() on the mouseDownTarget so that it has a chance to
                    // reset its appearance.
                    //
                    // For example, if the user touchstart's a tab (making the tab the mouseDownTarget,
                    // then drags their finger off of the tab, firing the mouseOut() event here
                    // resets the tab's appearance to the STATE_UP state.
                    } else if (EH._handledTouch == EH._touchEventStatus.TOUCH_ENDING || mouseDownTarget.containsPoint(x, y)) {
                        mouseUpReturn = EH.bubbleEvent(mouseDownTarget, EH.MOUSE_OUT, null, 
                                targetIsMasked);
                    }
                }
                // NOTE: call handleClick even if the Canvas target is null or changed between 
                // mouseDown and mouseUp, because we should still fire page-level click in that
                // circumstance.  handleClick will check (redundantly) for same target before
                // firing Canvas-level click.
                if (mouseUpReturn != false) {
                    EH.__handleClickReturnValue = EH.handleClick(event.target);
                }
            }
        }
    }

	// and always clear the redrawnWhileDown property
	delete EH.redrawnWhileDown;
	
	// clear all drag properties set by unscrupulous methods above
	EH.clearDragProperties();
	
    

	// EH._mouseIsDownInScrollbar must be cleared before we return, but *after* mouseUp and
    // click events been handled (and their bubbling averted by EH.eventHandledNatively()
    // immediately returning true) above
	if (EH._mouseIsDownInScrollbar) EH._mouseIsDownInScrollbar = false;

    //isc.Log.logWarn("handleMouseUp returning: " + 
    //                (isNative && EH.__handleClickReturnValue == true) +
    //                ", isNative: " + isNative + 
    //                ", handleClick: " + EH.__handleClickReturnValue);

    // If mouseUp or click returned false, __handleClickReturnValue will be false 
	// return true if the event was handled natively, or if neither of these handlers 
    // returned false.
    
    var target = event.target,
        overForm = isc.isA.DynamicForm!=null && isc.isA.DynamicForm(target);

    if (isNative && (overForm || EH.__handleClickReturnValue == true)) 
        return EH._handledNativelyReturnVal;
    // Return false unless this was over a form with an explicit true return val
    return (overForm && EH.__handleClickReturnValue == true);
},


// Clear all the miscellaneous isc.EventHandler properties set as a result of dragging.
clearDragProperties : function () {
	var EH = this;
    EH.wasNativeDragging = false;
    EH.crossFrameDragging = EH.nativeDragging = EH.dragging = false;
    delete EH._lastDragEnterTarget;
    if (EH._crossFrameDragCleanupTmrID != null) {
        isc.Timer.clear(EH._crossFrameDragCleanupTmrID);
        delete EH._crossFrameDragCleanupTmrID;
    }

	delete EH.dragTarget;
	delete EH.dragTargetStartRect;
	delete EH.dragTargetLink;

	delete EH.dragMoveTarget;
	delete EH.dragMoveAction;

	delete EH.dragOperation;
	delete EH.dragAppearance;

	delete EH.dropTarget;
	delete EH.lastDropTarget;
},


// handle context menu events.  Can be called directly by the browser or synthetically.

handleContextMenu : function (DOMEvent, synthetic) {
	// Some browsers (like Mac IE) have problems dealing with events fired before the page
    // finishes loading.  Just skip mouse event processing if the page hasn't loaded yet.
	if (!isc.Page.isLoaded()) return false;

    
    
        var EH = isc.EH;
    
    EH._handlingMouseUp = true; 
    var returnValue = EH._handleContextMenu(DOMEvent, synthetic);
    EH._handlingMouseUp = false;
    
    return returnValue;
},

_handleContextMenu : function (DOMEvent, synthetic) {
    
    var fromMouseEvent = this.isMouseEvent(this.lastEvent.eventType);
    
    if (this._contextMenuShown) {
        delete this._contextMenuShown;
        if (!synthetic) {
            return true;
        }
    }
    
    // If this is not a synthetic event, pick up the event properties
	if (DOMEvent) this.getMouseEventProperties(DOMEvent);
    var EH = this,
		event = EH.lastEvent,
        target = !fromMouseEvent ? event.keyTarget || event.target : event.target;
    // record that this was a mouse or keyboard triggered event. It's much harder to determine
    // this once we've wiped the previous event type
    
    event.keyboardContextMenu = !fromMouseEvent;
    
    event.eventType = "contextMenu";
        
    // If this came from a keyboard event, in IE the coordinates reported will be the
    // mouse coordinates. In order to show the context menu in the right place, specify the
    // event coordinates as matching basically the top/left of the focus canvas
    if (!fromMouseEvent) {
        event.x = target ? target.getPageLeft() : 0;
        event.y = target ? target.getPageTop() : 0;
    }

    
	if (isc.Browser.isSafari && EH.clickMaskClick(target) == false) {
        return false;
    }
        
	// handle the page-level showContextMenu event
	if (isc.Page.handleEvent(target, EH.SHOW_CONTEXT_MENU) == false) {
        return false;
    }

	// if the target is enabled, send it a showContextMenu event.
    var returnValue = true;
	if (EH.targetIsEnabled(target)) {	  
        returnValue = EH.bubbleEvent(target, EH.SHOW_CONTEXT_MENU);
    }

    if (returnValue != false) {
        
        var lastMoveTarget = EH.lastMoveTarget;
        if (lastMoveTarget) {
            delete EH.lastMoveTarget;
            EH.handleEvent(lastMoveTarget, EH.MOUSE_OUT);
        }
    }
    return returnValue;
},


handleNativeClick : function (DOMevent) {

	
    var EH = isc.EH,
		value = (EH.__handleClickReturnValue != false);

	delete EH.__handleClickReturnValue;

    
    if (isc.Browser.isAndroid) {

        EH.DOMevent = DOMevent;
        var	event = EH.getMouseEventProperties(DOMevent);

        switch (this._handledTouch) {
            case EH._touchEventStatus.READY_FOR_TOUCH:
            // fire synthetic mouseDown
            event.originalType = EH.CLICK;
            event.eventType = EH.MOUSE_DOWN;
            EH.doHandleMouseDown(DOMevent, event);
            // fall through to handle the mouseUp
            
            case EH._touchEventStatus.TOUCH_STARTED:
            // fire synthetic mouseUp
            event.originalType = EH.CLICK;
            event.eventType = EH.MOUSE_UP;
            EH._handleMouseUp(DOMevent, true);
            break;

            case EH._touchEventStatus.TOUCH_COMPLETE:
            break; // nothing to do; non-error case
        }
        // finished with synthetic events; return to resting state 
        this._handledTouch = EH._touchEventStatus.READY_FOR_TOUCH;
    }

    if (isc.Browser.isIE && !isc.Browser.isIE10) {
        EH.DOMevent = DOMevent;
        var event = EH.getMouseEventProperties(DOMevent);

        if (event.target && event.target._getUseNativeDrag()) return false;
    }

//	return value;
},

// NOTE: handleClick() is always called by handleMouseUp() during processing of a native
// mouseUp event, because we always synthesize the click event ourselves.  handleNativeClick()
// is what we do when we get a native click event.
handleClick : function (target, eventType) {
	// Some browsers (like Mac IE) have problems dealing with events fired before the page
    // finishes loading.  Just skip mouse event processing if the page hasn't loaded yet.
	if (!isc.Page.isLoaded()) return false;

	var EH = this,
		// get the properties of the event as 'lastEvent'
		event = EH.lastEvent,
        returnVal;

	// get the eventType if it wasn't passed in
    
	if (!eventType) eventType = (EH.isDoubleClick(target) ? EH.DOUBLE_CLICK : EH.CLICK);
    //EH.logWarn("target: " + target + ", mouseDownTarget: " + EH.mouseDownTarget() +
    //             ", stillWithinTarget: " + EH.stillWithinMouseDownTarget() + 
    //             ", native target: " + this.echoLeaf(event.nativeTarget));

	// call the Page-level click handler.  Note we will fire page-level click even if there is
    // no Canvas target
	if (isc.Page.handleEvent(target, eventType) == false) {
        returnVal = false;

	// if the click event was handled natively, bail
	} else if (EH.eventHandledNatively(eventType, event.nativeTarget)) {
		returnVal = EH._handledNativelyReturnVal;

	// if we have an enabled target, bubble the event
	} else if (!EH.targetIsEnabled(target)) {
        returnVal = false;

    // don't fire click if the Canvas target changed between mouseDown and mouseUp
    // or when the target is the body of a menu (otherwise the menu will not register the click
    // when the menu is within a window)
    } else if (!EH.stillWithinMouseDownTarget()) {
        returnVal = false;
        
    // otherwise bubble the event through the target canvas chain
    } else {
    
        var target = EH.mouseDownTarget();
    	returnVal = EH.bubbleEvent(target, eventType);
        
    }
    
    // Record when the event completed. We use this for double-click detection in some cases.
    EH._lastClickCompleteTime = isc.timeStamp();
	
	return returnVal;
},


//>	@classMethod	isc.EventHandler.isDoubleClick()	(A)
// Return true if this click in the target should be considered a double click, 
// false for a single click
//
//		@group	mouseEvents
//		@param	target		(object)	Canvas or DOM object that received the event
//
//		@return				(boolean)	true == real double click
//										false == really a single click
// @visibility internal
//<
isDoubleClick : function (target) {
	var EH = this,
        target = target || EH.lastEvent.nativeTarget;
    
    // If this click event occurred within the double-click delay of the last event, fire the
    // double-click handler rather than the click handler.
    
    var useNativeEventTime = EH.useNativeEventTime != null ? EH.useNativeEventTime :
                            (isc.Browser.isMoz && isc.Browser.isWin),
        time, withinDoubleClickInterval;

    // Explicit flag to indicate second click within double-click delay. This is used
    // by auto-test systems to ensure we handle two clicks as double click or separate single clicks
    // regardless of the timing during playback!
    if (EH._isSecondClick != null) {
        withinDoubleClickInterval = EH._isSecondClick;
    } else {
            
        if (useNativeEventTime) {
            var domevent = EH.lastEvent.DOMevent
                time = domevent ? domevent.timeStamp : null;
            // Sanity check
            if (time == 0 || !isc.isA.Number(time)) {
                this.logDebug("Unable to derive native 'timeStamp' attribute from DOM event");
                time = isc.timeStamp();
            }
            withinDoubleClickInterval = ((time - EH.lastClickTime) < EH.DOUBLE_CLICK_DELAY);        
            
        } else {
            time = isc.timeStamp();
            withinDoubleClickInterval = 
                // if it took us less than the double click delay to process the first click
                ((EH._lastClickCompleteTime - EH.lastClickTime) < EH.DOUBLE_CLICK_DELAY) ?
                    // then check for a second click strictly within the normal interval
                    ((time - EH.lastClickTime) < EH.DOUBLE_CLICK_DELAY) :
                    // otherwise treat any click that closely follows completion of the first click
                    // as a double click
                    ((time - EH._lastClickCompleteTime) < 100);        
        }
    }
        

        
	// remember the click time for later
	EH.lastClickTime = time;

	// clear the lastClickTarget if it's already too late
	if (!withinDoubleClickInterval) {
		delete EH.lastClickTarget;
	}
	
    // If the two clicks occurred on the same target this is a doubleClick,
    // unless the special "noDoubleClicks" flag is set on the target, (in which case
    // we fire multiple single clicks).
     
    var isDouble = false; 
    if (target == EH.lastClickTarget) {
        isDouble = !target.noDoubleClicks;
        if (isDouble) {
            var current = target;
            while (current.parentElement) {
                current = current.parentElement;
                if (current.noDoubleClicks) {
                    isDouble = false; 
                    break;
                }
            }
        }
    }

	// if this is a doubleClick, remove the lastClickTarget so we'll go back to clicking next
    // time
	// otherwise note that we were the last thing clicked in case a double-click comes in later
	EH.lastClickTarget = (isDouble ? null : target);
	
	return isDouble;
},


// If the target passed in has a concept of enabled/disabled, determine if it is enabled.
targetIsEnabled : function (target) {

	// if no target specified, return false
	if (!target) return false;
    
    // If the target has been marked as destroyed, don't attempt to fire the handler on it
    if (target.destroyed) return false;

	// if the target has a isDisabled function, return the results of that
	//	for canvases, this is defined to go up the parent chain for us
	if (isc.isA.Function(target.isDisabled)) return !target.isDisabled();

	// otherwise, the target doesn't have the concept of being enabled, so assume it is enabled
	return true;
},


// Pointer events
// ---------------------------------------------------------------------------------------
_handlePointerDown : function (DOMevent) {
    var EH = isc.EH;

    if (DOMevent.pointerType === "touch") {
        return EH._handleTouchStart(DOMevent);
    } else {
        EH.DOMevent = DOMevent;
        var event = EH.getMouseEventProperties(DOMevent);
        event.originalType = event.eventType;
        event.eventType = EH.MOUSE_DOWN;
        return EH.doHandleMouseDown(DOMevent, event);
    }
},

_handlePointerMove : function (DOMevent) {
    var EH = isc.EH;

    if (DOMevent.pointerType === "touch") {
        return EH._handleTouchMove(DOMevent);
    } else {
        EH.DOMevent = DOMevent;
        var event = EH.getMouseEventProperties(DOMevent);
        event.originalType = event.eventType;
        event.eventType = EH.MOUSE_MOVE;
        return EH._handleMouseMove(DOMevent, event);
    }
},

_handlePointerUp : function (DOMevent) {
    var EH = isc.EH;

    if (DOMevent.pointerType === "touch") {
        return EH._handleTouchEnd(DOMevent);
    } else {
        EH.DOMevent = DOMevent;
        var event = EH.getMouseEventProperties(DOMevent);
        event.originalType = event.eventType;
        event.eventType = EH.MOUSE_UP;
        return EH._handleMouseUp(DOMevent, true);
    }
},

_handlePointerCancel : function (DOMevent) {
    var EH = isc.EH;

    if (DOMevent.pointerType === "touch") {
        return EH._handleTouchCancel(DOMevent);
    } else {
        EH.DOMevent = DOMevent;
        var event = EH.getMouseEventProperties(DOMevent);
        event.originalType = event.eventType;
        event.eventType = EH.MOUSE_UP;
        return EH._handleMouseUp(DOMevent, true);
    }
},


//>Touch

// Touch events
// ---------------------------------------------------------------------------------------

_handlingTouchEventSequence : function () {
    
        var EH = isc.EH;

    return (EH._handledTouch != null &&
            EH._handledTouch != EH._touchEventStatus.READY_FOR_TOUCH &&
            EH._handledTouch != EH._touchEventStatus.TOUCH_COMPLETE);
},


_handleTouchStart : function (DOMevent) {
	
        var EH = isc.EH;

    EH.DOMevent = DOMevent;
	var	event = EH.getMouseEventProperties(DOMevent);

    
    delete event.touchStartReturnValue;

    // maintain touch state for synthetic mouseDown/mouseUp
    this._handledTouch = EH._touchEventStatus.TOUCH_STARTED;

    var returnValue = EH.handleEvent(event.target, EH.TOUCH_START);

    if (returnValue !== false) {
        event.originalType = EH.TOUCH_START;

        
        event.eventType = EH.MOUSE_MOVE;
        EH._handleMouseMove(DOMevent, event);

        event.eventType = EH.MOUSE_DOWN;
        returnValue = EH.doHandleMouseDown(DOMevent, event);

        // Treat the user holding the finger over an item as a "long touch" - this
        // will trip context menu behavior for mobile browsers (where right-click isn't
        // otherwise possible)
        // Could also trip hover prompt behavior at a pinch
        if (EH._longTouchTimer != null) isc.Timer.clear(EH._longTouchTimer);
        EH._longTouchTimer = this.delayCall("_handleLongTouch", [], EH.longTouchDelay);
    }
    
    return event.touchStartReturnValue;
},

// Number of ms before we fire the synthetic "longTouch" event (user holding their finger
// over a widget in a touch browser like iPad/safari)
longTouchDelay:500,
_handleLongTouch : function () {
    
        var EH = isc.EH;
    EH._longTouchTimer = null;

    // Showing a context menu and handling a drag operation are mutually exclusive. If already
    // dragging, then don't fire the long touch event (which could result in showing a context
    // menu).
    //
    // There is similar logic in __handleMouseMove() to not start a drag if there are open menus
    // on screen.
    if (EH.dragging) return;

    if (!EH.mouseIsDown() || !EH.mouseDownTarget() || !EH.stillWithinMouseDownTarget()) return;

	// send the event up the chain of the target
	EH.bubbleEvent(EH.mouseDownTarget(), EH.LONG_TOUCH);
},

_handleTouchMove : function (DOMevent) {
	
        var EH = isc.EH;

    EH.DOMevent = DOMevent;
	var	event = EH.getMouseEventProperties(DOMevent);

    var returnValue = EH.handleEvent(event.target, EH.TOUCH_MOVE);

    if (returnValue !== false) {
        event.originalType = EH.TOUCH_MOVE;
        event.eventType = EH.MOUSE_MOVE;
        EH._handleMouseMove(DOMevent, event);
        // prevent default full-page drag if we're doing an SC drag
        if (EH.dragging && window.event != null) window.event.preventDefault();
    }

    // kill "long touch" event on drag move - it's counter intuitive to have (for example)
    // both scrolling and a context menu when you drag.
    if (EH._longTouchTimer != null) {
        isc.Timer.clear(EH._longTouchTimer);
        EH._longTouchTimer = null;
    }
},

_handleTouchEnd : function (DOMevent) {
	
        var EH = isc.EH;

    EH.DOMevent = DOMevent;
	var	event = EH.getMouseEventProperties(DOMevent);

    // maintain touch state for synthetic mouseDown/mouseUp
    if (EH._handledTouch == EH._touchEventStatus.TOUCH_STARTED) {
        EH._handledTouch = EH._touchEventStatus.TOUCH_ENDING;
    }

    var returnValue = EH.handleEvent(event.target, EH.TOUCH_END);
    if (returnValue !== false) {
        event.originalType = EH.TOUCH_END;
        event.eventType = EH.MOUSE_UP;
        EH._handleMouseUp(DOMevent, true);
    }

    if (EH._handledTouch == EH._touchEventStatus.TOUCH_ENDING) {
        EH._handledTouch = EH._touchEventStatus.TOUCH_COMPLETE;
    }

    if (EH._longTouchTimer != null) {
        isc.Timer.clear(EH._longTouchTimer);
        EH._longTouchTimer = null;
    }
},


_handleTouchCancel : function (DOMevent) {

	
        var EH = isc.EH;

    EH.DOMevent = DOMevent;
    var	event = EH.getMouseEventProperties(DOMevent);

    // maintain touch state for synthetic mouseDown/mouseUp
    if (EH._handledTouch == EH._touchEventStatus.TOUCH_STARTED) {
        EH._handledTouch = EH._touchEventStatus.TOUCH_ENDING;
    }

    this.delayCall("_handleDelayedTouchCancel", [event, DOMevent]);
},

_handleDelayedTouchCancel : function (event, DOMevent) {
    
        var EH = isc.EH;
    var returnValue = EH.handleEvent(event.target, EH.TOUCH_END);
    if (returnValue !== false) {
        event.originalType = EH.TOUCH_CANCEL
        event.eventType = EH.MOUSE_UP;
        EH._handleMouseUp(DOMevent, true);
    }

    if (EH._handledTouch == EH._touchEventStatus.TOUCH_ENDING) {
        EH._handledTouch = EH._touchEventStatus.TOUCH_COMPLETE;
    }

    if (EH._longTouchTimer != null) {
        isc.Timer.clear(EH._longTouchTimer);
        EH._longTouchTimer = null;
    }
},

//<Touch

// Focus Handling
// ---------------------------------------------------------------------------------------


getFocusCanvas : function () {
    return this._focusCanvas;
},

// focusInCanvas and blurFocusCanvas
// Called as a result of an action that will focus in a canvas, such as calling widget.focus(),
// or clicking on the widget.




// helper to log native focus changes
_logFocus : function (target, isFocus) {
    if (!this.logIsDebugEnabled("nativeFocus")) return;

    this.logDebug((isFocus ? "onfocus" : "onblur") + 
                  " fired on: " + target + this._getActiveElementText(),
                  "nativeFocus");
},

_getActiveElementText : function () {
    if (!isc.Browser.isIE) return isc._emptyString;
    var activeElement = this.getActiveElement();
    
    if (activeElement == null) return isc._emptyString;
    return ", activeElement: " + ( 
                                  activeElement.tagName);
},


blurFocusCanvas : function (target, isNative) {
    //>DEBUG isNative indicates this call came from a blur handler on a native element (either
    // the handle or a focusProxy).
    var oldThread = this._thread;
    if (isNative) {
        this._setThread("BLR");
        this._logFocus(target);
        isc.EH._unconfirmedBlur = null;
    } //<DEBUG
    
    this._blurFocusCanvas(target, isNative);
    
    //>DEBUG
    if (isNative) this._thread = oldThread; //<DEBUG
},
_blurFocusCanvas : function (target, isNative) {
    //this.logWarn("_blurFocusCanvas called with focusCanvas: " + this._focusCanvas);
    if (this._focusCanvas) {
        var focusCanvas = this._focusCanvas;

        
        if (target != null && focusCanvas != target) return;
        this._focusCanvas = null;
        focusCanvas._focusChanged(false);
        
    }
},

focusInCanvas : function (target, isNative) {

    //>DEBUG isNative indicates this call came from a focus handler on a native element (either
    // the handle or a focusProxy).
    var oldThread = this._thread;
    if (isNative) {
        this._setThread("FCS");
        this._logFocus(target, true);
        isc.EH._unconfirmedFocus = null;
    } //<DEBUG
    
    // In Moz by default focus outline shows up on both mouseDown and focus via tab-keypress
    // we only want it to show up via keypress (like in IE).
    // use setShowFocusOutline to update the css setting to hide the focus outline if this focus
    // came from a mouseDown.
    if (isc.Browser.isMoz) {        
        if (isNative && (this.lastEvent.eventType != this.KEY_DOWN && 
                         this.lastEvent.eventType != this.KEY_PRESS && 
                         this.lastEvent.eventType != this.KEY_UP)) 
        {
            if (target && target.showFocusOutline) target.setShowFocusOutline(false,true);
        } else {
            if (target && target.showFocusOutline) target.setShowFocusOutline(true,true);
        }
    }
    this._focusInCanvas(target, isNative);

    //>DEBUG
    if (isNative) this._thread = oldThread; //<DEBUG
},
_focusInCanvas : function (target, isNative) {
    //this.logWarn("_focusInCanvas. Will set this._focusCanvas to target:" 
    //             + target + ", current focus target:" + this._focusCanvas);
    // if no target, or target doesn't want focus, or target has focus already just bail

    if (!target || target.hasFocus || !target._canFocus() || target.isDisabled() ) return;
    // Bail if this._focusCanvas is already pointing to the target.
    // Normally we'd expect target.hasFocus to be set in this case but if the _focusChanged
    // method on either the previous focus target or the new one forces a focus change, that
    // can occur before target.hasFocus gets modified.
    if (this._focusCanvas == target) return;

    // Handle the case of focus going to a masked widget
    this.checkMaskedFocus(target);
    // If the target is masked, update the topmask's 'maskedFocusCanvas'
    
    if (this.targetIsMasked(target) && !target._ignoreClickMaskFocus) {
        var topMask = this.clickMaskRegistry.last();
        this.setMaskedFocusCanvas(target, topMask);
    }

    
    if (isNative && isc.Browser.isMoz) {
        if (target.parentElement) target.parentElement._handleCSSScroll(null, true);
    }

    // blur the previous focus item, and focus in this one
    var blurCanvas = this._focusCanvas;
    this._focusCanvas = target;
    if (blurCanvas) blurCanvas._focusChanged(false)

    // if the blur handler forced focus into *another* widget, bail - we don't want to
    // fire _focusChanged on a stale widget - that'd cause hasFocus to be set on that widget
    // and be essentially stale
    if (this._focusCanvas != target) return;
    target._focusChanged(true);

    
},

// Helper to set (or clear) the 'masked focus canvas' for some mask.
setMaskedFocusCanvas : function (target, mask) {
    if (!mask) return;
    mask._maskedFocusCanvas = target;
},

getMaskedFocusCanvas : function (mask) {
    if (mask == null) mask = this.clickMaskRegistry.last();
    else mask = this.getClickMask(mask);
    if (mask) return mask._maskedFocusCanvas;
},

// fired when focus goes onto a widget which may be covered by a clickmask.
// if the mask is soft, it automatically dismisses that clickMask and fires the click
// action.
checkMaskedFocus : function (target) {
    
    
    if (isc.Browser.isIE || isc.Browser.seleniumPresent) {
 
        var activeElement = this.getActiveElement();
        var handle = target ? target.getHandle() : null;   
        // no handle - undrawn so bail
        if (!handle) return;
        var focusStillInCanvas;
        
        while (activeElement && activeElement.tagName) {
        
            if (activeElement == handle) {
                focusStillInCanvas = true;
                break;
            }
            // if "eventProxy" is specified look at that and bail early - it either is or isn't
            // the widget that fired the onfocus event.
            if (activeElement.eventProxy) {
                focusStillInCanvas = (activeElement.eventProxy == target.getID());
                break;
            }
            activeElement = activeElement.parentElement;
        }
        if (!focusStillInCanvas) return;
    }
    
    
    if (isc.Browser.isMobileWebkit) {
        if (isc.EH.isMouseEvent(isc.EH.lastEvent.eventType) && 
            (isc.EH.mouseDownTarget() == target))
        {
            return;
        }
    }
    
    var masks = this.clickMaskRegistry;
    for (var i = masks.length-1; i >= 0; i--) {
        var mask = masks[i];
        // As soon as we hit a mask we know we're ABOVE we know we're above all remaining
        // masks so we can bail.
        if (!this.targetIsMasked(target, mask)) return;
        else {
            // we should never be able to focus on a widget under an hard 
            // clickmask - just return false if we do hit this case
            if (this.isHardMask(mask)) return false;
            this._clickMaskClick(mask);
        }
    }
},


// prepare for a drag interaction on "target" (a Canvas)
prepareForDragging : function (target) {
	var EH = this;

    
    if (EH.dragging) EH.handleDragStop();

	delete EH.dragMoveAction;
	delete EH.dragTarget;

    // send prepareForDragging event: target is expected to set various dragging-related flag,
    // especially dragTarget, if it wants to be dragged.  See default implementation in Canvas.
    EH.bubbleEvent(target, "prepareForDragging");
    // no one set a drag target
    if (!EH.dragTarget) {
        if (this.logIsDebugEnabled("dragDrop")) this.logDebug("No dragTarget, not dragging", "dragDrop");
        return;
    }
    
    //>DEBUG
    if (this.logIsInfoEnabled("dragDrop"))
        this.logInfo("target is draggable with dragOperation: " + EH.dragOperation + 
                     ", dragTarget is : " + EH.dragTarget + 
                     (EH.dragTarget != target ? " (delegated from: " + target + ")" : ""), 
                     "dragDrop");
    //<DEBUG

	// remember the original rect of the dragTarget in case we need it later
	EH.dragTargetStartRect = EH.dragTarget.getRect();
},

// Handle the artificially generated dragStart event, sent to a draggable object when the mouse
// goes down in the object and then moves the dragStartDistance while still down.
// 
// Fires Canvas.dragStart() on the target (which may cancel the event) and sets up the visual
// appearance of dragging.
handleDragStart : function (nativeDragging) {
	var EH = this,
		event = EH.lastEvent;

	if (!EH.mouseIsDown() || !EH.dragTarget) return false;

    
	delete EH.dropTarget;
	delete EH.dragMoveTarget;
	// reset the dragOffsetX and dragOffsetY in case somebody set it before
    // these properties indicate the offset of the last event coordinates (typically this is
    // the position of the mouse) from the drag target
	EH.dragOffsetX = -10;
	EH.dragOffsetY = -10;
	
	// during dragging no Canvii will get mouseOver/mouseOut, so we need to send a final mouse
    // out event to avoid a Canvas getting stuck in the "over" state.  
    EH.handleEvent(EH.lastMoveTarget, EH.MOUSE_OUT);
    
    // likewise we need to send mouseOut to the mouseDownTarget to avoid it getting stuck in
    // the down state.  
    
    if (EH.lastMoveTarget != EH.mouseDownTarget()) {
        EH.handleEvent(EH.mouseDownTarget(), EH.MOUSE_OUT);
    }
    
    // If we're currently showing a hover, hide it.
    // We're not checking for the lastHoverCanvas matching the drag target etc since dragging could
    // be delegated from one drag target to another and there are no obvious cases where we'd
    // want the hover to be visible during dragging
    if (isc.Hover) isc.Hover.clear();

    // remember the drag offset; this is the distance between the point where the mouse went
    // down to start D&D and the top/left corner of the element being dragged.  We want to
    // maintain that offset during dragging, otherwise, dragRepositioned objects would have
    // their top-left corner snap to the mouse position when dragging began, and dragResized
    // objects would jerk by the dragOffset when dragging starts.
    // NOTE: capture offset before dragStart since dragStart might deparent.
    EH.dragStartOffsetX = EH.mouseDownEvent.x - EH.dragTarget.getPageLeft();
    EH.dragStartOffsetY = EH.mouseDownEvent.y - EH.dragTarget.getPageTop();

	// bubble the appropriate [dragStart, dragRepositionStart, or dragResizeStart] message to
    // the target.  This is an opportunity to set EH.dragAppearance
	var eventType = EH.dragOperation + "Start";
	
	if (EH.handleEvent(EH.dragTarget, eventType) == false) {
        //>DEBUG
        this.logInfo("drag cancelled by false return from: " + 
                      eventType + " on " + EH.dragTarget,
                      "dragDrop");
        //<DEBUG

		// if it returns false, cancel dragging
		delete EH.dragTarget;
		delete EH.dragTargetLink;

		// send the drag object a mouseOver since we sent it mouse out when dragging began
		EH.handleEvent(EH.dragTarget, EH.MOUSE_OVER);

		return false;
	}

	// clear the lastMoveTarget since we've sent a mouseOut with no mouseOver
	delete EH.lastMoveTarget;
	

	// if we're dragRepositioning, and the dragAppearance is not the tracker,
	// set the isc.EventHandler.dragOffsetX and .dragOffsetY to the offset from the drag target
	var dragAppearance = EH.dragTarget.getDragAppearance(EH.dragOperation);
	if (dragAppearance != EH.TRACKER)
    {
		EH.dragOffsetX = EH.dragStartOffsetX;
		EH.dragOffsetY = EH.dragStartOffsetY;
	}
	
    // dragAppearance
    // --------------
	// We set the action to be performed on mouseMove events during dragging, based on the
    // dragTarget's dragAppearance.  For all types of dragging, we have:
    // - a "dragMoveTarget", which is a Canvas, and is chosen on the basis of dragAppearance.
    //   It can be the dragTarget itself ("target" dragAppearance) or some other object which
    //   stands in, like an outline or small "tracker".
    // - a "dragMoveAction", which is a function called every mouseMove.  The two built-in
    //   dragOperations, dragResizing and dragRepositioning, work by setting the dragMoveAction
    //   to a function that drag resizes or drag repositions the dragMoveTarget.
    //
    // Note that the dragAppearance is independant of whether you are doing dragResizing,
    // dragRepositioning, or a custom drag.  If you set a dragAppearance and do a generic drag
    // (that is, set canDrag but not canDragReposition or canDragResize), then we default the
    // dragMoveAction to moving the dragMoveTarget around; this is often used to show a
    // tracker.
    if (EH.dragOperation == EH.DRAG_SCROLL ||
        nativeDragging)
    {
        EH.dragAppearance = EH.NONE;
    } else {
        EH.dragAppearance = EH.dragTarget.getDragAppearance(EH.dragOperation);
    }

	// "tracker" drag appearance
    // - a small Canvas, settable via setDragTracker, "tracks" the mouse cursor at a small offset
	//
	if (EH.dragAppearance == EH.TRACKER) {
		// using the drag tracker
		EH.dragMoveTarget = EH._makeDragTracker();
        // tracker moves to event
		if (!EH.dragMoveAction) EH.dragMoveAction = EH._moveDragMoveTarget;

		// if the target wants it, tell it to set the dragTracker image
		EH.dragTracker.setOverflow(isc.Canvas.VISIBLE);
		EH.bubbleEvent(EH.dragTarget, EH.SET_DRAG_TRACKER);

		// change the offset for the tracker -- default -10,-10 in dragTrackerDefaults, but
        // customizable in setDragTracker()
		EH.dragOffsetX = EH.dragTracker.offsetX;
		EH.dragOffsetY = EH.dragTracker.offsetY;

	// "outline" drag appearance
    //
	} else if (EH.dragAppearance == EH.OUTLINE) {
        EH.dragMoveTarget = EH.getDragOutline(EH.dragTarget);

        // on drag move, we'll move to the mouse
		if (!EH.dragMoveAction) EH.dragMoveAction = EH._moveDragMoveTarget;

	// "target" drag appearance
	//
	} else if (EH.dragAppearance == EH.TARGET) {
		EH.dragMoveTarget = EH.dragTarget;
		if (!EH.dragMoveAction) EH.dragMoveAction = EH._moveDragMoveTarget;
        
        // If the canvas wants to show a shadow on drag, show it now.
        if (EH.dragTarget.showDragShadow) this._showTargetDragShadow();
		
        // If the canvas should change opacity on drag, handle this now.
        if (EH.dragTarget.dragOpacity != null) this._setTargetDragOpacity();
	// custom move style
	//
	} else {
		// nothing special to do here -- your target should set things up manually in its
		// .dragStart() handler.  It can set EH.dragMoveTarget and/or EH.dragMoveAction if
        // desired.
	}

	// if a dragMoveTarget is set, bring it to the front and show it
	if (EH.dragMoveTarget) {
		// make sure dragMoveTarget and dragTarget agree on some basic stuff
		if (EH.dragMoveTarget != EH.dragTarget) {
			EH.dragMoveTarget.dragIntersectStyle = EH.dragTarget.dragIntersectStyle;

		}
        // show and bring to front
        EH.dragMoveTarget.show();
        EH.dragMoveTarget.bringToFront();
	}


    //>PluginBridges
    
    var backmaskTarget = EH.dragMoveTarget ? EH.dragMoveTarget : EH.dragTarget;
    if ((isc.Browser.isIE || isc.Browser.isMoz) && EH.dragAppearance != EH.OUTLINE
        // already backmasked or should never be backMasked
        && !(backmaskTarget._isBackMask || backmaskTarget.neverBackMask)) 
    {
        if (EH.alwaysBackMask) {
            this._showBackMask(backmaskTarget);
        } else {            
            var burnThroughElements = [];

            
            if (isc.BrowserPlugin) {
                var pluginInstances = isc.BrowserPlugin.instances;
                for (var i = 0; i < pluginInstances.length; i++) {
                    var pluginInstance = pluginInstances[i];
                    if (pluginInstance.isVisible()
                        && (backmaskTarget.parentElement == null    
                            || backmaskTarget.parentElement.contains(pluginInstance, true)))
                    {
                        burnThroughElements.add({instance: pluginInstance, 
                                                 rect: pluginInstance.getPageRect()});
                    }
                }
            }
    
            
            if (isc.Browser.isIE && isc.Browser.minorVersion >= 5.5 && isc.NativeSelectItem) {
                var selectItems = isc.NativeSelectItem.instances;
                for (var i = 0; i < selectItems.length; i++) {
                    var selectItem = selectItems[i];
                    if (selectItem.isVisible() 
                        && (backmaskTarget.parentElement == null 
                            || backmaskTarget.parentElement.contains(selectItem.containerWidget, true)))
                    {
                        burnThroughElements.add({instance: selectItem, rect: selectItem.getPageRect()});
                    }
                }
            }

            // if dynamicBackMask is false and we have elements that we could intersect with that
            // require backMasking, just show the backMask
            if(burnThroughElements.length > 0 && EH.dynamicBackMask === false) 
            {
                this._showBackMask(backmaskTarget);
            } else {
                // set up the cache so that handleDragMove can do fast intersect tests
                EH._burnThroughElementsCache = burnThroughElements;
            }
        }
    }
    //<PluginBridges

    
	EH.showEventMasks((EH.dragOperation == EH.DRAG_RESIZE));

	// set the 'dragging' flag to true since we're dragging
	EH.dragging = true;
    EH.nativeDragging = !!nativeDragging;
    EH.crossFrameDragging = false;

    if (EH.nativeDragging && EH.delayedMouseMoveTimer != null) {
        isc.Timer.clear(EH.delayedMouseMoveTimer);
        EH.delayedMouseMoveTimer = null;
    }

    //>DEBUG
    this.logInfo("Started dragOperation: " + EH.dragOperation + 
                  " with dragTarget: " + EH.dragTarget +
                  " dragAppearance: " + EH.dragAppearance, "dragDrop");
    //<DEBUG

	return true;
},

// Methods to show/hide drag shadows for targets.

_showTargetDragShadow : function () {
    var EH = isc.EH;
    var target = EH.dragTarget;

    EH._hideShadowAfterDrag = (!target.showShadow);
    EH._afterDragShadowDepth = target.shadowDepth;
    
    target.shadowDepth = EH.dragTargetShadowDepth;
    target.updateShadow();
    if (!target.showShadow) target.setShowShadow(true);
},

_hideTargetDragShadow : function () {
    var EH = isc.EH;
    var target = EH.dragTarget;

    if (EH._hideShadowAfterDrag) target.setShowShadow(false);
    target.shadowDepth = EH._afterDragShadowDepth;
    target.updateShadow();
    
    delete EH._hideShadowAfterDrag;
    delete EH._afterDragShadowDepth;
},

// Methods to modify the opacity of the drag target
_setTargetDragOpacity : function () {
    var EH = isc.EH;
    var target = EH.dragTarget;
    
    // Remember the old opacity 
    
    EH._dragTargetOpacity = target.opacity;
    
    target.setOpacity(target.dragOpacity);
},

_resetTargetDragOpacity : function () {
    var EH = isc.EH,
        target = EH.dragTarget;
    target.setOpacity(EH._dragTragetOpacity);
},


_showBackMask : function (target) {
    if (target._backMask) {
        if (!target._backMask.isVisible()) target._backMask.show();
    } else {
        target.makeBackMask({_eventHandlerDragMoveMask: true});
    }
},

_hideBackMask : function (target) {
    if(target._backMask && target._backMask._eventHandlerDragMoveMask
       && target._backMask.isVisible()) 
    {
        target._backMask.hide();  
    }
},


_getDragMoveComponents : function () {
    var dmt = this.dragMoveTarget;
    if (!dmt) return;
    var components = [dmt];
    if (dmt._backMask) components.add(dmt._backMask);
    if (dmt._edgedCanvas) components.add(dmt._edgedCanvas);
    if (dmt._shadow) components.add(dmt._shadow);
    return components;
},

// Helper to speed up the 'dragRepositionMove' et al name assembly
_dragMoveEventNames:{},
_getDragMoveEventName : function (dragOperation) {
    var eventNames = this._dragMoveEventNames;
    if (!eventNames[dragOperation]) {
        eventNames[dragOperation] = dragOperation + "Move";
    }
    return eventNames[dragOperation];
},

// Deliver the synthetic dragMove event, also handling the dragAppearance
handleDragMove : function () {
	var EH = this,
		event = EH.lastEvent;

	// get the drop target, if there is one
    isc._useBoxShortcut = true;
	EH.dropTarget = EH.getDropTarget(event);
    isc._useBoxShortcut = false;
    
    //>PluginBridges
    

    if (EH._burnThroughElementsCache && EH.dynamicBackMask) {
        var showBackMask = false;    
        var backmaskTarget = EH.dragMoveTarget ? EH.dragMoveTarget : EH.dragTarget;
        var backmaskTargetRect = backmaskTarget.getRect();

        for (var i = 0; i < EH._burnThroughElementsCache.length; i++) {
            var burnThroughElement = EH._burnThroughElementsCache[i];
            if (isc.Canvas.rectsIntersect(burnThroughElement.rect, backmaskTargetRect)) 
            {
                EH._lastBurnThroughElement = burnThroughElement.instance;
                showBackMask = true;
                break;
            }
        }

        // Applet/IFrame layering workaround - see doc in Applet.repaintIfRequired()
        if (EH._lastBurnThroughElement) {
            if (EH._lastBurnThroughElement.repaintIfRequired) EH._lastBurnThroughElement.repaintIfRequired();
        }

        if (showBackMask) {
            this._showBackMask(backmaskTarget);
        } else {
            this._hideBackMask(backmaskTarget);
            delete EH._lastBurnThroughElement;
        }
    } else if (isc.BrowserPlugin) {
        isc.BrowserPlugin.handleDragMoveNotify();
    }
    //<PluginBridges

	// if a dragMoveAction has been set, call it now
	if (EH.dragMoveAction) EH.dragMoveAction();

	// send the appropriate [dragMove, dragResizeMove, dragRepositionMove] event to the
    // dragTarget and bail if it returns false.  This is another way for your handler to stop
	// drop processing if you don't like what you're about to be dropped over.
    // NOTE: this cancels drop events being sent to the candidate drop target, not the
    // dragMoveAction, which eg moves the dragTracker with the mouse.
	if (EH.handleEvent(EH.dragTarget, this._getDragMoveEventName(EH.dragOperation)) == false) {
		delete EH.dropTarget;
		return false;
	}
	
	// if the dropTarget is not the last drop target that got a mouse event
	//	send the dropOver and dropOut routines to the targets
	if (EH.dropTarget != EH.lastDropTarget) {

        //>DEBUG
        this.logDebug("New drop target: " + EH.dropTarget, "dragDrop");
        //<DEBUG

		// send the mouseOut event to the last mover object
		if (EH.lastDropTarget) {
			EH.handleEvent(EH.lastDropTarget, EH.DROP_OUT);
		}

		// send the mouseOver event to the target
		if (EH.dropTarget) {
			EH.handleEvent(EH.dropTarget, EH.DROP_OVER);
		}
		
		// remember that we're the last move object
		EH.lastDropTarget = EH.dropTarget;
	}

	// call dropMove on the dropTarget
	if (EH.dropTarget) {
		EH.handleEvent(EH.dropTarget, EH.DROP_MOVE);
	}

    isc._useBoxShortcut = true;
    this._handleDragScroll();
    isc._useBoxShortcut = false;

    
    if (this.dragOperation == EH.DRAG_SELECT) return true;
    return false;
},

// Automatic scroll on drag: if we're dragging near the edge of a scrollable widget, scroll it
// in the appropriate direction.

_handleDragScroll : function () {
    var EH = this,
        dragTarget = EH.dragTarget;
    
    // don't use automatic drag scrolling at edges if the drag operation itself is scrolling
    // (the two behaviors would fight)
    if (EH.dragOperation == EH.DRAG_SCROLL) return;

    // Determine which widget would be scrolled (assuming we're over the right place)
    
    var scrollCandidates = [];
    // If this is a drag-select, we only ever want to scroll the widget itself or its
    // parent-list.
    // Otherwise respect dragScrollType
    var canvasList = (EH.dragOperation == EH.DRAG_SELECT) || 
                        dragTarget.dragScrollType == "parentsOnly" ?
                        dragTarget.getParentElements() : isc.Canvas._canvasList;
    ;
    if (EH.dragOperation == EH.DRAG_SELECT) canvasList.addAt(dragTarget, 0);

    // shortcut - if there are no valid scroll candidates, just bail
    // True for top level widgets with dragScrollType set to parentsOnly
    if (canvasList == null || canvasList.length == 0) return;
    
    for (var i = 0; i < canvasList.length; i++) {
        if (canvasList[i].isDrawn() && canvasList[i].isVisible() && 
            canvasList[i].shouldDragScroll()
        ) {
            scrollCandidates.add(canvasList[i]);
        }
    }
        
    var event = EH.lastEvent,
        eX = event.x, eY = event.y,
        matches = [];

    //this.logWarn("have dragScroll candidates: " + scrollCandidates);

    for (var i = 0; i < scrollCandidates.length; i++) {
        
        if (scrollCandidates[i].visibleAtPoint(eX, eY, false, EH._getDragMoveComponents()))
            matches.add(scrollCandidates[i]);
    }
        
    // If we end up with more than one scroll candidate, one must be an ancestor of the 
    // other [as visibleAtPoint() will not return true for a widget covered by another widget]
    // Check each of these for whether we're over the scroll area of the widget,
    // and remove from the list of candidates if not
        
    if (matches.length > 0) {
        var scrollWidget;
        for (var i = 0; i < matches.length; i++) {
            // dragScrollDirection used to limit dragScrolling of ancestors to either
            // horizontal or vertical
            // This property is set on certain widgets such as the scrollbar thumb where
            // scrolling the parent in response to dragging only makes sense on one axis
            if (matches[i]._overDragThreshold(dragTarget.dragScrollDirection)) {
                if (scrollWidget == null || scrollWidget.contains(matches[i], true)) 
                    scrollWidget = matches[i];
            }
        }
        if (scrollWidget != null) {
            scrollWidget._setupDragScroll(
                dragTarget.dragScrollDirection, 
                // scroll on drag select has some additional logic in Canvas.js to
                // avoid scrolling a parent too far
                EH.dragOperation == EH.DRAG_SELECT);
        }
    }
},


// Deliver the artificially generated 'dragStop' event when the mouse goes up at the end of a
// drag
handleDragStop : function () {

	var EH = this,
		event = EH.lastEvent,
        successfulDrag = false;

    EH.wasNativeDragging = EH.nativeDragging;

	// note that we're no longer dragging
    EH.crossFrameDragging = EH.nativeDragging = EH.dragging = false;

    //>DEBUG
    this.logInfo("end of drag interaction", "dragDrop");
    //<DEBUG

    // reset the drag offsets
	EH.dragOffsetX = EH.dragOffsetY = 0;

    var dragTarget = EH.dragTarget,
        dragMoveTarget = EH.dragMoveTarget,
        dragOperation = EH.dragOperation;

	// if the dragMoveTarget is the tracker or outline, hide it
	if (dragMoveTarget && 
        (dragMoveTarget == EH.dragTracker || dragMoveTarget == EH.dragOutline)) 
    {
		dragMoveTarget.hide();
        
	} else {
        // If we're showing a drag-shadow, hide (or shrink) it
        if (dragTarget.showDragShadow) EH._hideTargetDragShadow();
        
        // If the target has a special drag-opacity, revert to orginal opacity
        // If we're showing a drag-shadow, hide (or shrink) it
        if (dragTarget.dragOpacity != null) EH._resetTargetDragOpacity();
        
    }
    
    // if the dragTracker was customized via setDragTracker(), destroy it now and re-create
    // next time we need it.
    if (this.dragTracker && this.dragTracker._isCustomized) {
        this.dragTracker.destroy();
        delete this.dragTracker;
    }

    //>PluginBridges
    var backmaskTarget = EH.dragMoveTarget ? EH.dragMoveTarget : EH.dragTarget;
    this._hideBackMask(backmaskTarget);

    if (EH._burnThroughElementsCache) delete EH._burnThroughElementsCache;
    //<PluginBridges

	// if there is a dropTarget, 
    var dropTarget = EH.dropTarget;
	if (dropTarget) {
		// send it the 'dropOut' event so it can reset its visible state
		EH.handleEvent(EH.dropTarget, EH.DROP_OUT);
        if (dropTarget.willAcceptDrop()) EH.handleEvent(dropTarget, EH.DROP);
        successfulDrag = true;
    }

    // determine if we were dragging something other than the dragTarget (eg an outline)
    var wasDraggingTarget = (dragTarget == dragMoveTarget);

	// send the dragTarget the [ dragStop | dragRepositionStop | dragResizeStop ] event so it can
    // reset its visual state
	if (EH.handleEvent(dragTarget, dragOperation+"Stop") != false) {

        successfulDrag = true;
        
        if (dragOperation == EH.DRAG_RESIZE) {
 
            if (!wasDraggingTarget) {
                // if we're dragging a tracker, don't resize to fit it, rely on the event coords instead

                if (dragMoveTarget != null && this.dragAppearance != this.TRACKER) {

                    // resize the dragTarget to the size of the dragMoveTarget
                    dragTarget.setPageRect(  dragMoveTarget.getPageLeft(),
                                             dragMoveTarget.getPageTop(),
                                             dragMoveTarget.getWidth(),
                                             dragMoveTarget.getHeight(),
                                             true   );
                // drag appearance "none"
                } else {
                    var resizeEdge = isc.EH.resizeEdge;
                    if (resizeEdge != null) {
                        var X = isc.EH.getX(),
                            Y = isc.EH.getY(),
                            lOffset = resizeEdge.contains("L") ? X- EH.dragTargetStartRect[0] : 0,
                            tOffset = resizeEdge.contains("T") ? Y- EH.dragTargetStartRect[1] : 0;
                            
                        // One of "L", "R", "T", "B", "LR", etc
                        dragTarget.setPageRect(
                            resizeEdge.contains("L") ? X : EH.dragTargetStartRect[0],
                            resizeEdge.contains("T") ? Y : EH.dragTargetStartRect[1],
                            resizeEdge.contains("R") ? X - dragTarget.getPageLeft() 
                                : EH.dragTargetStartRect[2] - lOffset,
                            resizeEdge.contains("B") ? isc.EH.getY()-dragTarget.getPageTop()
                                :  EH.dragTargetStartRect[3] - tOffset,
                            true
                        );
                    }
                }
            }
            
            var deltaX = dragTarget.getVisibleWidth() - EH.dragTargetStartRect[2],
                deltaY = dragTarget.getVisibleHeight() - EH.dragTargetStartRect[3];

            // fire 'dragResized()' one-time event to indicate we're done drag-resizing
            
            dragTarget.dragResized(deltaX, deltaY);

        // otherwise if a reposition operation
        } else if (dragOperation == EH.DRAG_REPOSITION) {
            if (!wasDraggingTarget) {
                if (dragMoveTarget != null) {
                    // move the target if we were moving a different drag-move target.
                    dragTarget.setPageRect(  dragMoveTarget.getPageLeft(),
                                             dragMoveTarget.getPageTop()  );
                } else {
                    dragTarget.setPageRect(isc.EH.getX(), isc.EH.getY());
                }
				// and bring it to the front
				dragTarget.bringToFront();
			}
            
            // Fire 'dragRepositioned' to indicate we have drag-moved the widget
            EH.dragTarget.dragRepositioned();
		}

	// drag[Reposition|Resize]Stop returned explicit "false", indicating cancel -
	// if we were moving the dragTarget, put it back the way we found it
	} else {
		if (dragOperation == EH.DRAG_RESIZE) {
			// if we were actually resizing the original target
			if (wasDraggingTarget) {
				// set its rect back to its original rect
				dragTarget.setRect(EH.dragTargetStartRect);
			}
		} else if (EH.dragOperation == EH.DRAG_REPOSITION) {
			// if we were actually moving the original target
			if (wasDraggingTarget) {
				// set its location back to its original location
				dragTarget.moveTo(EH.dragTargetStartRect[0],EH.dragTargetStartRect[1]);
			}			
		}
        // Don't fire the one-time resized() / repositioned() events in this case.
	}
	
	// clear all drag properties (they may have been set by event handlers)
	EH.clearDragProperties();

	// 030801 jmd: hide eventMasks (which avoided swallowing of drag events in iframes)
	EH.hideEventMasks();

	// send the object under the mouse a 'mouseOver' event and make it the lastMoveTarget
    // In DOM browsers and IE4, mouseUp is sent to the object under the mouse, so we can
    // send mouseOver to the event target.
    // But, don't do this if handling the end of a touch event sequence because the overTarget
    // might be left thinking that the mouse is over it for a while. For example, if the user
    // drag-rearranges the header buttons of a ListGrid on a touch-enabled device, the user just
    // lifted his or her finger off of the display, so the header button might be shown in the
    // "Over" state for a while while EH waits for a touchstart event that might not ever come.
    if (EH._handledTouch != EH._touchEventStatus.TOUCH_ENDING) {
        var overTarget = EH.lastEvent.target;
        if (overTarget) EH.handleEvent(overTarget, EH.MOUSE_OVER);
        EH.lastMoveTarget = overTarget;
    }

	// return whether the drag was successful
	return successfulDrag;
},

// Return the Canvas that is the intended recipient of this event.
//
// This maps events from the physical DOM into our logical Canvas event space,
// allowing us to process events in canvases easily.
//
// If the targeted canvas has an 'eventProxy', that will receive the event instead.
//			
//		@param	DOMevent		(DOM event) 		DOM event object (as passed by isc.EventHandler)
//		@param	target			(DOM element) 		Native DOM element that got the event (default is DOMevent.target|srcElement).
//
//		@return				(Canvas || DOM object)	Canvas or DOM object that is event recipient
_$BODY:"BODY", _$HTML:"HTML",
_$eventProxyAttributeName:"eventProxy",
_$eventPartAttributeName:"eventpart",
getEventTargetCanvas : function (DOMevent, target, scEvent) {
    
    // DOMevent may be null if this method is being used to just
    // locate a canvas from a DOM element explicitly.
    
    if (DOMevent == null) DOMevent = {};
    
    var EH = this,
        wd = this.getWindow();

    

    if (!target) target = (isc.Browser.isIE ? DOMevent.srcElement : DOMevent.target);
    //this.logWarn("native target:"+ (target ? (target.tagName + ", " + target.id) : " null"));

    
    if (!EH._canAccessNativeTargetProperties(target)) {
        //this.logWarn("TextNode exception: had to return last target " + EH.lastTarget);    
        return EH.lastTarget;
    }

    if (DOMevent && DOMevent._isSynthetic) return DOMevent.target;

    // optimization: if there is no target or the target is the body tag (so there is no
    // canvas target), bail immediately.  This means we don't burn CPU time while the mouse
    // is moving around outside all Canvas's
    if (!target || target.tagName == this._$BODY || target.tagName == this._$HTML) {
        //this.logWarn("event targetted at body");
        return (EH.lastTarget = null);
    }

    if (target && target.tagName && target.tagName == this._$applet) {
        var appletID = isc.Applet ? isc.Applet.idForName(target.name) : null;
        return appletID ? window[appletID] : EH.lastTarget;
    }
   
    
    if (isc.Browser.isIE && target.parentElement == null) {
//         this.logWarn("Defaulting to last target because target: " + Log.echoLeaf(target) + 
//                      " has null parentElement");
        target = EH.lastTarget;
    } else {
        var eventProxyAttributeName = this._$eventProxyAttributeName,
            eventPartAttr = this._$eventPartAttributeName,
            eventPartElement = null,
            eventPart = null,
            eventPartID = null;

        // follow the DOM parent chain to find the nearest containing Element which has an
        // eventProxy attribute - the eventProxy attribute is the global ID of a Canvas
        // which will handle the event.
        // NOTE: all Canvii write out an eventProxy on the DIV that contains all
        // their content.  This is normal way events are routed, however, you can put an
        // "eventProxy" attribute in any HTML element to have its events handled by a Canvas.
        //var lookupChain = [];
        
        if (isc.Browser.isIE && !isc.Browser.isIE9) {
            // in IE, any attribute written in HTML is available as a property on the
            // HTMLElement object
            while (target != null) {
                //lookupChain.add(target);
                
                if (scEvent != null && eventPart == null && target[eventPartAttr] != null) {
                    eventPartElement = target;
                    eventPart = target.eventpart;
                    // Store the whole ID - no need for the performance hit of chopping
                    // off the leading widgetID_partName_ stuff unless this is
                    // actually required (let Canvas handle that).
                    eventPartID = target.id;
                }

                // stop if we've found the eventProxy attribute
                if (target.eventProxy) break;

                // otherwise continue to parent
                target = target.parentElement;
            }

            
            if (eventPartID == isc.emptyString) eventPartID = null;
        } else {
            // in DOM browsers, you have to use DOM methods like hasAttribute/getAttribute.
            while (target != null) {
                //lookupChain.add(target);
                var hasAttr = (target.hasAttribute != null);
                if (scEvent != null && eventPart == null && 
                    (target.eventpart != null ||
                    (hasAttr && target.hasAttribute(eventPartAttr))) )
                {
                    eventPartElement = target;
                    eventPart = target.getAttribute(eventPartAttr);
                    eventPartID = target.getAttribute("id");
                }

                // stop if we've found the eventProxy attribute
                if (target.eventProxy != null ||
                    (target.hasAttribute != null && 
                     target.hasAttribute(eventProxyAttributeName))) break;

                // otherwise continue to parent
                target = target.parentNode;
            }
        }

        // If we found an eventPart, hang onto it now.
        // Otherwise clear the stored eventPart info.
        
        if (scEvent && target != null) {
            scEvent.eventPart = eventPart;
            scEvent.eventPartElement = eventPartElement;
            scEvent.eventPartID = eventPartID;
        }

        

        // we followed the parent chain until it ended without finding an eventProxy
        // attribute, so there's no Canvas to handle this event
        if (!target) return (EH.lastTarget = null);

        // "target" is the first DOM element in the parent chain with an eventProxy
        // attribute.  It's eventProxy attribute is a String that is the global ID of a
        // Canvas.  convert target to a Canvas
        target = wd[target.getAttribute(eventProxyAttributeName)];

        // Canvii can use the eventProxy attribute to delegate events to other Canvii
        while (target && target.eventProxy) {
            //if (DOMevent.type != "mousemove") {
            //    this.logWarn("Canvas: " + target + " delegates to: " + target.eventProxy);
            //}
               
            if (isc.isA.String(target.eventProxy)) {
                // if eventProxy is the string ID of a Canvas, convert it to a pointer to the
                // other Canvas, and store the looked-up Canvas.
                target.eventProxy = wd[target.eventProxy];
            }
            target = target.eventProxy;
        }

        // now we have the final target of the event
        
        if (this.logIsInfoEnabled() && !DOMevent || 
            (DOMevent.type != "mousemove" && DOMevent.type != "selectstart")) 
        {
            if (target != null) {
                this.logInfo("Target Canvas for event '" + DOMevent.type + "': " + target);
            } else {
                this.logDebug("No target Canvas for event '" + DOMevent.type + "'");
            }
        }

        // if the event is in the drag tracker, send it to the last known object instead
        if ( target == EH.dragTracker ) {
           target = EH.lastTarget;
        }

        // remember the object for later, in case we get a weird event where we can't
        // figure out the target
        EH.lastTarget = target;
    }

    // if the target is a canvas, return that
    if (isc.isA.Canvas(target)) {
        if (scEvent && target.getEventTarget) {
            target = target.getEventTarget(scEvent);
        }
        return target;
    }

    // return null since no canvas target was found
    return null;
},

_$textObjectString:"[object Text]",
_canAccessNativeTargetProperties : function(target) {
    

    // Optimization - if we're not in Moz, looking at a text node, assume we're ok
    try {
        if (!(isc.Browser.isMoz && target == this._$textObjectString)) return true; 
        target.parentNode;
    } catch (e) {
        return false;
    }
    return true;
   
},



//>	@classMethod	isc.EventHandler.getDropTarget()	(A)
//	    Return the first object that's registered that it's interested in drops that is under
//	    the mouse.<br>
//      This method does not check the result of the dynamic 'willAcceptDrop()' method, so it's
//      possible that the canvas returned by this method will not actually accept drop from the
//      dragged widget.
//
//		@group	dragDrop
//		@param	event		(SC event)  Event object, as returned from EH.getMouseEventProperties
//
//		@return				(Canvas)	Canvas that should receive the drop, or null if none found
//  @visibility internal
//<
// Note: Not checking willAcceptDrop() is desired behavior - this allows behavior such as showing
// the no-drop indicator (for example no drop indicator on certain rows in a grid)
getDropTarget : function (event) {
	var EH = this;

    

	// if there is no target or the drag target can't be dropped, 
	//	return null because there can't be a drop target!
	if (!EH.dragTarget || !EH.dragTarget.canDrop || 
        EH.dragOperation == EH.DRAG_RESIZE) return null;

	var target = (EH.dragMoveTarget || EH.dragTarget),

	    dropCandidates = EH._dropRegistry,
		matches = [],
		i = 0,
		length = dropCandidates.length,
        
        // we'll always disallow dropping over self if dragAppearance is target
        canDropOnSelf = (target.getDragAppearance(EH.dragOperation) != isc.EH.TARGET)
	;

	// perform different checks based on how we're supposed to intersect the drop targets
	if (target.dragIntersectStyle == EH.INTERSECT_WITH_MOUSE) {
 
        
        if ((event.target != this.mouseDownTarget() ||
            (isc.Browser.isIE || (isc.Browser.isSafari && !isc.Browser.isTouch) || 
            (isc.Browser.isMoz && isc.Browser.geckoVersion > 20040616 &&
             !this.mouseDownTarget()._useMozScrollbarsNone))) )
        {
            var dropTarget = event.target;

            // allow delegating dropTarget for eg dropLine indicators
            while (dropTarget && dropTarget.dropTarget) dropTarget = dropTarget.dropTarget;
            if ((canDropOnSelf || dropTarget != target) &&
                (dropCandidates.contains(dropTarget)))
            {
                //this.logWarn("used quick check, dropTarget: " + dropTarget + 
                //              ", event target: " + event.target);
                return dropTarget;
            }
        }

		// check whether mouse coordinates are within candidate drop target
        // Note - we're using 'visibleAtPoint()' here rather than 'containsPoint()', as we don't
        // want to pick up a drop target that's occluded by another widget.
        // We may still pick up more than one match, as one canAcceptDrop:true widget may be
        // a child of another.
        // We ignore the dragMoveTarget in this check since it is likely to be under the mouse
        // (or near enough that a quick movement may put it under the mouse).
		for (;i<length;i++) {
			var candidate = dropCandidates[i];
            
            if (candidate.canAcceptDrop && !candidate.isDisabled() &&
                (
                 candidate.visibleAtPoint(event.x, event.y, false, 
                                          EH._getDragMoveComponents())
			     // candidate.containsPoint(event.x, event.y))
                ) &&
                (canDropOnSelf || !target.contains(candidate, true))
               ) 
            {
                matches.add(candidate);
			}
		}
    } else {
        // check whether dragMoveTarget (tracker, outline, etc) intersects candidate drop target
        for (;i<length;i++) {
            var candidate = dropCandidates[i];
            if (!canDropOnSelf && candidate == target) continue;
            
            if (candidate.intersects(target) && 
                candidate.canAcceptDrop && !candidate.isDisabled()) 
            {
                matches.add(candidate);
            }
        }
    }

    //this.logWarn("dropTarget matches" + matches);

	// if there's only one possible drop target, return it
	if (matches.length < 2) return matches[0];

    // For mouse intersection, we may have multiple matches.
    // If some match is the parent of another, the child will always be given preference
    var nearestMatch = matches[0];
    for (var i = 1; i < matches.length; i++) {
        var currentMatch = matches[i];
        // if one is an ancestor of the other, the descendant always wins
        if (nearestMatch.contains(currentMatch, true)) {
            nearestMatch = currentMatch;
        
        // intersectRect check about doesn't handle the case of overlapping widgets occluding
        // each other catch the case of 1 match occluding another.
        } else if (target.dragIntersectStyle == EH.INTERSECT_WITH_RECT) {
         
            // Othewise we want to find a common ancestor of both widgets,
            // and compare the z-indices of their separate ancestors in that common scope
            var commonParent = null,
                nmCommonScopeAncestor = nearestMatch, 
                cmCommonScopeAncestor = currentMatch;
                
            while (commonParent == null) {
                // if we've reached a top-level ancestor widget, the common scope is the document 
                // body, so we'll compare the top-parent of each match widget.
                if (nmCommonScopeAncestor.parentElement == null) {
                    commonParent = true;    // to break out of the while loop
                    cmCommonScopeAncestor = currentMatch.topElement || currentMatch;
    
                // Otherwise check if the ancestor's parentElement is also the ancestor of the 
                // currentMatch
                } else if (nmCommonScopeAncestor.parentElement.contains(currentMatch, true)) {
                        commonParent = nmCommonScopeAncestor.parentElement;
                        // iterate up the currentMatch's parents til we find one in the right scope
                        while (cmCommonScopeAncestor.parentElement != commonParent) {
                            cmCommonScopeAncestor = cmCommonScopeAncestor.parentElement;
                        }
                        
                } else {
                    // look at the ancestor's parent (which we know is not a common ancestor of both
                    // matches)
                    nmCommonScopeAncestor = nmCommonScopeAncestor.parentElement;
                }
            }
            
            // compare the z-indices of the ancestors in the same scope, and adjust nearestMatch if
            // necessary
            if (cmCommonScopeAncestor.getZIndex() > nmCommonScopeAncestor.getZIndex()) {
                nearestMatch = currentMatch;	
            }
        }
    }
    
    return nearestMatch;
},

// Register a canvas passed to receive drop events.
registerDroppableItem : function (item) {
	if (!item._dropRegistered) {
		this._dropRegistry.add(item);
		item._dropRegistered = true;
	}
},

// Un-register a canvas so it will no longer receive drop events
unregisterDroppableItem : function (item) {
	this._dropRegistry.remove(item);
	delete item._dropRegistered;
},


// Register this Canvas as needing to be "masked" during drag interactions, because it contains
// something that will otherwise swallow events.

registerMaskableItem : function (item, makeMask) {
	if (!this._maskRegistry.contains(item) && 
	        (item._maskTarget == null || !this._maskRegistry.contains(item._maskTarget))) {
        // keep a list of items that need masking so we can show their masks when a drag begins
		this._maskRegistry.add(item);

		if (item.dragMaskType == "iframe") {
		    if (makeMask) this.makeEventFrame(item, {eventProxy:item});
		} else if (item.dragMaskType == "hide") {
        } else if (item.dragMaskType == "hidePlugin") {
        } else {
	        // make an event mask for the item that just passes events through to it.  It won't be
	        // show()n yet.
	        if (makeMask) this.makeEventMask(item, {eventProxy:item});
		}
	}
},

//>	@classMethod	isc.EventHandler.unregisterMaskableItem()	(A)
//		Remove this canvas from the _maskRegistry and destroy its
//		event mask peer.
//   @visibility internal
//<
unregisterMaskableItem : function (item) {
	this._maskRegistry.remove(item);
    if (item._eventMask) item._eventMask.destroy();
	delete item._eventMask;
},

// Make a transparent mask suitable for capturing events, as a peer of the target Canvas
makeEventMask : function (canvas, properties, rect) {
    if (isc.isA.Function(canvas.makeEventMask)) return canvas.makeEventMask(properties, rect);

    var defaults = this._eventMaskProperties;
    
    // In IE7, the spacerHTML isn't sufficient to mask IFRAMEs properly, but an image works
    // Note: if you update this code, also check and update ScreenSpan.getInnerHTML()
    if (!defaults.contents) defaults.contents = isc.Browser.isIE && isc.Browser.version > 6 ? 
        isc.Canvas.blankImgHTML(3200,2400) : isc.Canvas.spacerHTML(3200,2400);
    var mask = isc.Canvas.create({
			ID:canvas.getID()+"_eventMask",
			cursor:canvas.cursor,
            _maskTarget: canvas
		}, defaults, properties);
    mask.setRect(rect ? rect : canvas.getRect());
    canvas._eventMask = mask;
	canvas.addPeer(mask);
    return mask;
},

//>	@classAttr	EventHandler._eventMaskProperties  (object : {...} : IRWA)
//  @visibility internal
//<
_eventMaskProperties : {
	autoDraw:false,

    // match the size of the Canvas we're masking
    _resizeWithMaster:true,
	_redrawWithMaster:false,

    // NOTE: we can't initialize the contents here because EventHandler loads before Canvas.
    // By setting very large contents with overflow:hidden we never need to redraw on resize.
    //contents:isc.Canvas.spacerHTML(3200, 2400),
    overflow:"hidden",

    // start out hidden, only show if explicitly shown
    visibility:"hidden",
    _showWithMaster:false,

    getTarget : function () {
        return this._maskTarget;
    },
    
    show : function () {
		// when we're show()n (because dragging has begun), move above the master.  NOTE: this
        // doesn't guarantee the eventMask stays above the master in general - only when
        // explicitly show()n
        var master = this.masterElement;
		this.moveAbove(master);
		return this.Super("show", arguments);
	}
},

// Show event masks for all registered canvases, or a single event mask
// spanning the entire screen if simpleMask is true.
showEventMasks : function (simpleMask, unmaskedItems) {
	var EH = this,
		maskedItems = EH._maskRegistry;
	if (simpleMask) {
        // just do a single screen-sized mask
		if (!EH._eventMask) EH._eventMask = isc.ScreenSpan.create({
            ID:"isc_EH_eventMask",
			mouseDown:function () {this.hide()},	// 030801 jmd: insurance against lock-out if stuck
            // if the screenspan gets destroyed() clear up our pointer to it
            pointersToThis:[{object:EH, property:"_eventMask"}]
		});
		EH._eventMask.show();
		EH._eventMask.bringToFront();
        //>BrowserPlugin
        // browser plugin masks typically cannot be replaced by a single screen mask, always
        // show these
        if (isc.BrowserPlugin) {
            maskedItems.intersect(isc.BrowserPlugin.instances).map("_showDragMask");
        }
        //<BrowserPlugin
	} else {
        // show masks for all components that need masking
		for (var i = 0; i < maskedItems.length; i++) {
            var item = maskedItems[i];

            // If we've been passed an explicit set of items to mask, ensure only those
            // items end up masked.
            if (unmaskedItems && unmaskedItems[item.getID()]) {
                item._hideDragMask();
			} else {
                item._showDragMask();
            }
		}
	}
},

// Hide event masks for all registered canvases, or the single event mask
// spanning the entire screen.
hideEventMasks : function () {
	var EH = this,
		maskedItems = EH._maskRegistry;

	if (EH._eventMask && EH._eventMask.isVisible()) {
		EH._eventMask.hide();
        if (isc.BrowserPlugin) {
            maskedItems.intersect(isc.BrowserPlugin.instances).map("_hideDragMask");
        }
	} else {
		for (var i = 0; i < maskedItems.length; i++) {
			maskedItems[i]._hideDragMask();
		}
	}
},


// Return true if the specified event should be handled by the native event mechanism rather
// than by our EventHandler mechanism.  Used to avoid interferance with native form event
// processing and other similar cases.

_handledNativelyReturnVal:isc.Browser.isIE ? isc.undef : true,
eventHandledNatively : function (eventType, nativeTarget, checkTargetOnly) {
    // If passed a native event name (standard behavior), convert the eventType to our ISC 
    // eventType.
    // Note: if we fail to convert it, we will simply work with whatever we were passed as
    // an event type.
    var iscEventType = eventType;
    if (!this.reverseEventTypes[eventType]) {
        if (this._nativeMouseEventMap[eventType]) 
            iscEventType = this._nativeMouseEventMap[eventType];
        else if (this._nativeKeyEventMap[eventType]) 
            iscEventType = this._nativeKeyEventMap[eventType];
    }
    
    var returnValue = this._eventHandledNatively(iscEventType, nativeTarget, checkTargetOnly);
    if (returnValue && this.logIsDebugEnabled() && iscEventType != "mouseMove") {
        this.logDebug(eventType + " event on " + 
                        (checkTargetOnly ? " native target:" + nativeTarget : this.lastTarget)
                        + " handled natively");
    }
    return returnValue;
}, 

_$handleNativeEvents:"handleNativeEvents",
_$applet: "APPLET",
_eventHandledNatively : function (eventType, nativeTarget, checkTargetOnly) {
    //!DONTCOMBINE

	eventType = (eventType || "");

    
	var EH = this,
		event = EH.lastEvent;

    
    if (!EH._canAccessNativeTargetProperties(nativeTarget)) {
        //EH.logInfo("eventHandledNatively() can't get to event target properties." +
        //           "  Returning true");
        return true;
    }
    if (nativeTarget && nativeTarget.tagName == this._$applet) return true;    


    // if there's no target canvas, the event did not occur over any ISC widgets...
    // don't interfere with event handling if it's a mouse event.  Return true
    
    var isMouseEvent = EH.isMouseEvent(eventType),
        iscTarget = isMouseEvent ? event.target : event.keyTarget;
    
 
    if (!checkTargetOnly && isMouseEvent && iscTarget == null) return true;

    //>DEBUG
    if ((this.logIsInfoEnabled() && eventType == EH.KEY_DOWN) ||
        (this.logIsDebugEnabled() && (eventType == EH.KEY_UP || eventType == EH.KEY_PRESS))) 
    {
        this.logInfo(eventType + " event with Canvas target: " + this.lastEvent.keyTarget +
                     ", native target: " + this.echoLeaf(nativeTarget));
    }
    //<DEBUG
	// if it's a form element or an anchor, just return true so the event can be processed
    // automatically
	// NOTE: we may have an image (or something else) that is contained in an anchor, 
	//		 so we have to look through the list of parentElements for an anchor tag, 
	//		 we can't just look at the nativeTarget
    
	if (EH.passThroughEvents && nativeTarget) {
    
    
        //if (eventType.startsWith("key")) {
        //    this.logWarn("nativeTarget: " + this.echoDOM(nativeTarget));
        //}
		// testTarget will change to be successive parentElements of the nativeTarget
		//	until we get to the body tag
		var testTarget = nativeTarget,
            
            // isNative will be true if 
            // - the target has been marked as handling native events, or
            // - we've found either a native form or anchor element, which is not a focusProxy
            handleNativeEvents = (testTarget.handleNativeEvents || 
                                    (testTarget.getAttribute ? 
                                     testTarget.getAttribute(this._$handleNativeEvents) : null)),
            tagName = testTarget.tagName,
            isNative
        ;
        
        if (!EH._falseString) EH._falseString = "false";            
        
        // If the 'handleNativeEvents' flag wasn't explicitly set, check for form items and
        // elements that will want to handle their own events.
        
        if (handleNativeEvents == null) {

            isNative = (!testTarget.focusProxy &&
                            
                           ((testTarget.form != null && tagName != EH._labelString) || 
                            
                            EH._formTags[tagName] != null ||
                            // editable DIVs (Not supported in Mozilla)
                            
                            (testTarget.isContentEditable && 
                                !testTarget.getAttribute(this._$eventProxyAttributeName)))
                        );

    		// if we didn't find a form, check if we're inside an anchor tag, because we want to
            // allow native processing (following the link).
            
            if (!isNative && (eventType != EH.MOUSE_WHEEL) && (eventType != EH.MOUSE_MOVE)) {
    			while (testTarget && 
                        testTarget.tagName != EH.BODY_TAG && testTarget.tagName != this._$HTML) 
                {
                    // Don't iterate up past any widget's handle - we don't expect canvii to be
                    // written out inside <A> tags
                    
                    if (testTarget.eventProxy != null ||
                        (testTarget.hasAttribute != null && 
                         testTarget.hasAttribute(this._$eventProxyAttributeName))) break;
                
    				if (EH._anchorTags[testTarget.tagName] != null) {
                        
                        var HNE = (testTarget.handleNativeEvents || 
                                    (testTarget.getAttribute ? 
                                     testTarget.getAttribute(this._$handleNativeEvents) : null));
            
                        if (HNE != null && !isc.isA.emptyString(HNE)) {
                            if (isc.isA.String(HNE)) 
                                HNE = (HNE == isc.EH._falseString ? false : true);
                        }
                        
                        if (HNE != false) {
                            isNative = true;
                            break;
                        }
    				}
    				testTarget = testTarget.parentNode;
    			}
    		}
        } else {
        
            // isNative derived directly from the "handleNativeEvents" property hung on the
            // DOM element.  This will be a string - convert "false" to false, so the check for 
            //  if (isNative) {... 
            // will do the right thing.
            isNative = handleNativeEvents;
            if (isNative == EH._falseString) isNative = false;
        }
        
		// if we found a native form or anchor element, return so we don't process the event
        // ourselves
		if (isNative) {
            return true;
            
        // if we had an explicit 'handleNativeEvents=false' specified on the target, avoid 
        // further checking
        } else if (handleNativeEvents != null) {
            return false;
        }
	}
    
    // At this point we know that the event occurred on a canvas, and not over any of the
    // special elements that need native handling.
    //
	// if the event was a mouse-event in a CSS scrollbar let it be handled natively.
    if (!checkTargetOnly && isMouseEvent &&
        this._eventOverCSSScrollbar(iscTarget, eventType, event)) 
    {
        return true;
    }
	// return false so isc event processing continues
	return false;
},

// Is the event passed in a mouse event?
isMouseEvent : function (eventType) {
    // This method is used by eventHandledNatively to determine whether the DOMevent it is 
    // looking at is a mouse event.
    // As such the eventType passed in may be the native event name - which is all lowercase
    // rather than our camelCase event names.  Handle either case.
    
    eventType = eventType || this.lastEvent.eventType;
    
    // list of all mouse events, native and ISC names
    if (this._mouseEvents == null) {
        this._mouseEvents = {
            mouseOver:true, mouseover:true,
            mouseDown:true, mousedown:true, rightMouseDown:true,
            mouseMove:true, mousemove:true,
            mouseOut:true, mouseout:true,
            mouseUp:true, mouseup:true,
            
            DOMMouseScroll:true, mousewheel:true, mouseWheel:true,
            click:true,
            doubleClick:true, doubleclick:true,
            showContextMenu:true, showcontextmenu:true,
            selectStart:true, selectstart:true
        }
    }

    if (this._mouseEvents[eventType] == true) return true;
    
        
    // IE's selectionChanged event can be triggered by mouse or keyboard - this is the last event
    // we record when the user puts focus in a TextItem by mouse or keyboard.
    // Check for event.keyName having been recorded to determine if this was 
    // Tab keypress or similar vs a mouse click
    if (eventType == "selectionChange") {
        return (this.lastEvent.keyName == null || this.lastEvent.keyName == "");
    }
    
    // context menu events can be mouse or keyboard triggered
    // We record a flag on the 'lastEvent' object as part of the handleContextMenu flow which
    // allows us to track this.
    if (eventType == "contextMenu" || eventType == "contextmenu") {
        return !this.lastEvent.keyboardContextMenu
    }
    // otherwise it's not a mouse event.
    return false;
},

// Is the event passed in a key event?
isKeyEvent : function (eventType) {
    // This method is used by eventHandledNatively to determine whether the DOMevent it is 
    // looking at is a key event.
    // As such the eventType passed in may be the native event name - which is all lowercase
    // rather than our camelCase event names.  Handle either case.

    eventType = eventType || this.lastEvent.eventType;
    
    if (this._keyEvents == null) {
        this._keyEvents = {};
        var ke = this._keyEvents;
        
        // ISC names:
        ke[this.KEY_DOWN] =true; ke[this.KEY_PRESS] = true; ke[this.KEY_UP] = true;
        
        // add native event names:
        var nativeMap = this._nativeKeyEventMap;
        for (var name in nativeMap) ke[name] = true;
    }

    if (this._keyEvents[eventType] == true) return true;

    if (eventType == "contextMenu" || eventType == "contextmenu") {

        return !!this.lastEvent.keyboardContextMenu
    }

    // otherwise it's not a key event.
    return false;
},

// Did the current mouse event occur over a native CSS scrollbar?
_eventOverCSSScrollbar : function (iscTarget, eventType, event) {

    
    if (isc.Browser.isTouch) return false;

    //this.logWarn("checking event over css scrollbar");
    var EH = this;
    
    		
    // If there's no target or we're not showing native scrollbars, return false
	if (!iscTarget || iscTarget.showCustomScrollbars || 
        !(iscTarget.vscrollOn || iscTarget.hscrollOn)) return false;
        
    
    
    // if right to left, scrollbar on LEFT
    var scrollbarSize = isc.Element.getNativeScrollbarSize();
    if (iscTarget.isRTL()) {
        if ( (iscTarget.vscrollOn && (event.x < iscTarget.getPageLeft() + scrollbarSize) ) ||
             (iscTarget.hscrollOn && (event.y > iscTarget.getPageTop() + 
                                  iscTarget.getHeight() - scrollbarSize) ) 
           )
        {
            if (eventType==EH.MOUSE_DOWN) EH._mouseIsDownInScrollbar = true;
            return true;
        }
    // else if left to right (normal), scrollbar on RIGHT
    } else {
        if ((iscTarget.vscrollOn && (event.x > iscTarget.getPageRight() - scrollbarSize)) ||
            (iscTarget.hscrollOn && (event.y > iscTarget.getPageBottom() - scrollbarSize)) ) 
        {                      
            if (eventType==EH.MOUSE_DOWN) EH._mouseIsDownInScrollbar = true;
            //this.logWarn(eventType + " in scrollbar");
            return true;
        }
    }

    return false;
},


//>	@classMethod	isc.EventHandler.bubbleEvent()	(A)
// Bubble the eventType in question up through the Canvas hierarchiy
//
//		@group	eventBubbling
//		@param	target		(object)	Canvas or DOM object that received the event
//		@param	eventType	(string) 	name of this event
//		@param	eventInfo	(any)		information passed with a custom event (see e.g. Slider)
//      @param  [targetIsMasked] (boolean) If passed we have already tested whether this target 
//                                         is masked, so don't re-check in this method
//
//		@return				(boolean)	false == cancel further event processing
//										anything else == continue processing
//      @visibility internal
//<

_dontLogBubble : {
    mouseMove : true,
    mouseOver : true,
    mouseOut : true
},

bubbleEvent : function (target, eventType, eventInfo, targetIsMasked) {
	var EH = this,
    	event = EH.lastEvent;

    //>DEBUG
	var logBubble = this.logIsDebugEnabled() && !this._dontLogBubble[eventType];
    //<DEBUG

    // check if this widget is masked, and, if a click on this widget would be cancelled, block
    // all mouse events from going to the target.  This prevents rollovers and other
    // indications of interactivity from appearing on components when in fact a click will do
    // nothing.
    //
    // Note that a mouseDown that dismisses a soft clickmask does so before reaching this
    // check.
    
    var isMouseEvent = this.isMouseEvent(eventType);
    if (isMouseEvent) {
        
        if (targetIsMasked == null) {
            
            targetIsMasked = this.targetIsMasked(target, null);
        }
        if (targetIsMasked) {
            //>DEBUG
            if (logBubble) {
                this.logDebug(eventType + " on " + target + " blocked by clickmask");
            }
            //<DEBUG
            return false;
        }
    }

    // For each event, we check for the existance of the 'internal' handler function - named
    // 'handle' + eventType ("handleMouseDown", etc.).
    // If this is defined on the target, call that otherwise, if the event name itself is
    // defined, call that.
    // - Note: this means 'handleMouseDown' (etc.) as defined on the target widget is
    //   responsible for calling 'mouseDown'.
    var eventHandlerName = this._getInternalHandlerName(eventType);

    var prevTarget = null;
    while (target) {
        // never fire an event for a destroyed widget
        if (target.destroyed) break;
        var nextTarget = null;
        var method = null;

		// go up the eventParent or parentElement chain, using an eventProxy if one is defined
        // NOTE: calculate the next target here, because parent hierarchy might change during
        // event handling (eg clear() self when tearing off from a Layout), but the former
        // parent should still receive the event that happened within it.
        
        // Allow only key events or only mouse events to be bubbled up the control heirarchy
        // by specifying keyEventParent or mouseEventParent respectively.
        if (target.mouseEventParent && eventType.startsWith("mouse")) {
            nextTarget = target.mouseEventParent;
        } else if (target.keyEventParent && eventType.startsWith("key")) {
            nextTarget = target.keyEventParent;    
        } else {
            nextTarget = (target.eventParent || target.parentElement);
        }
		if (nextTarget && nextTarget.eventProxy) nextTarget = nextTarget.eventProxy;


        if (target[eventHandlerName] != null) {
            method = eventHandlerName;
        } else if (target[eventType] != null && target[eventType] != isc.Class.NO_OP
                                        && !isc.is.emptyString(target[eventType])) {
            method = eventType;                                        
        

			// if the eventType was defined as a string, convert it to a function
			if (isc.isA.String(target[eventType])) {
				target.convertToMethod(eventType);                
			}

            //>DEBUG
            if (logBubble) {
                this.logDebug("Bubbling event '" + eventType + "', target '" + target + 
                              "' has handler: " + this.echoLeaf(target[eventType]));
            }
            //<DEBUG
        }
        
        // if we have either a 'handleEvent' method or a straight 'event' method, fire it
        if (method != null && target[method] != null) {
            //this.logWarn(target + "[" + method + "]" + " is:" + target[method]);
    
            var result;
            //try {
                // now call the event handler, and if it returns false or cancels bubbling, bail
                if (isc.DrawItem != null && isc.isA.DrawItem(target) && method == "dragMove") {
                    result = target[method](event, eventInfo, prevTarget);
                } else {
                    result = target[method](event, eventInfo);
                }
            //} catch (e) {
            //    this.logWarn("error returned invoking event handler: " + 
            //                 target.ID + "." + method + ": " + e.toString() + this.getStackTrace());
            //}

			if (result == false) {
                //>DEBUG
                if (logBubble) {
                    this.logDebug("Bubbling for event '" + eventType + 
                                  "' cancelled via false return value by target: " + target);
                }
                //<DEBUG
                return false;
            }
			if (result == EH.STOP_BUBBLING) {
                //>DEBUG
                if (logBubble) {
                    this.logDebug("Bubbling for event '" + eventType + 
                                  "' cancelled via STOP_BUBBLING return value by target: " + target);
                }
                //<DEBUG
                
                // Note: returning the stop-bubbling code, so callers of this method will see
                // the difference between 
                // - events that returned false (typically return false to the DOM to cancel
                //   native propogation)
                // - events that stopped bubbling but didn't return false (return true to the
                //   DOM - allow native event handling to continue unhindered)
                // - events that made it all the way to the top of the object hierachy (may want
                //   to prevent further event processing / bubbling, but not cancel the event 
                //   natively by returning false)
                
                return EH.STOP_BUBBLING;
            //} else {
            //    this.logDebug("Skipping " + target + ", no handler");
            }
		}

        
        if (target.bubbleEvents == false ||
            (target.bubbleMouseEvents == false && EH.isMouseEvent(eventType))) 
        {
            //>DEBUG
            if (logBubble) {
                this.logDebug("Bubbling for event '" + eventType + 
                              "' stopped by '" + target + 
                              "' which does not allow bubbling");
            }
            //<DEBUG
            return true;
        } else if (isc.isAn.Array(target.bubbleMouseEvents)) {
            // target.bubbleMouseEvents is an array of event-names to suppress bubbling for
            if (target.bubbleMouseEvents.contains(eventType)) {
                //>DEBUG
                if (logBubble) {
                    this.logDebug("Bubbling for event '" + eventType + 
                                  "' stopped by '" + target + 
                                  "' which does not allow bubbling");
                }
                //<DEBUG
                return true;
            }
        }

        prevTarget = target;
        target = nextTarget;
	}

	// we got to the end and noone failed -- return true to keep propagating the event!
    //>DEBUG
    if (logBubble) this.logDebug("Event '" + eventType + "' bubbled to top");
    //<DEBUG
	return true;
},

//>	@classMethod	isc.EventHandler._getInternalHandlerName()	(A)
// For each event, return the name of the preferred handler function to be called
// by bubble handler.
// This consists of the event name (passed in) prefixed with 'handler', and with
// the first character converted to uppercase.
//          
//		@group	eventBubbling
//		@param	event		(string)	Name of the event
//
//		@return			(string)    Name of preferred handler
//      @visibility internal
//<
_getInternalHandlerName : function (eventName) {
    
    if (!this._eventHandlerMap[eventName]) {
        this._eventHandlerMap[eventName] = 
                        "handle" + eventName.charAt(0).toUpperCase() + eventName.substring(1);
//        isc.Log.logWarn("handler for eventType:" + eventName + " is " + this.eventHandlerMap[eventName]);
    }
    return this._eventHandlerMap[eventName];
},
    

// Determine whether a target canvas (or any of its parents up the event bubbling
// hierachy) have a handler defined for an event.
// Note: This means either having the event property itself defined, or 'handleEvent'
// defined.
hasEventHandler : function (target, event) {
    if (!isc.isAn.Object(target) || !isc.isA.String(event)) {
        isc.Log.logWarn(
            "EventHandler.hasEventHandler() passed bad parameters [" 
                + [target, event] + "]. returning null;", 
            "event"
        );
        return null;
    }
    var handlerName = this._getInternalHandlerName(event);
    if (this.getBubbledProperty(target, event, true, handlerName, true) != null) {
        return true;
    }
    return false;
},

// Return the value of a certain property for the target or, if not defined,
// for the first of the target's parents to define the property.
// When `expectingMethod' is true, then Class.NO_OP or an empty string are also considered to
// be "not defined".
getBubbledProperty : function (target, property, expectingMethod, property2, expectingMethod2) {
	while (target) {
        var val = target[property];
        if (val && (!expectingMethod || (val !== this.NO_OP &&
                                         !isc.isAn.emptyString(val))))
        {
            return val;
        }
        if (property2 != null) {
            val = target[property2];
            if (val && (!expectingMethod2 || (val !== this.NO_OP &&
                                              !isc.isAn.emptyString(val))))
            {
                return val;
            }
        }
		target = (target.eventParent || target.parentElement);
		if (target && target.eventProxy) target = target.eventProxy;
	}
	return null;
},


// handle the native "selectStart" event (IE specific) 
// In general, we want to suppress selection of text on web pages as it conflicts
// with drag and drop (and looks bad on pages with absolute positioning stuff).

handleSelectStart : function () {
    
        var EH = isc.EH;

    //isc.Log.logDebug("handleSelectStart() triggered (handler for native onselectstart).");

    // In IE9, this event is fired when a selection occurs in response to a call to 
    // programmatically select a block of text (as we do in FormItem.setSelectionRange())
    // In that case we want selection change to be allowed regardless of
    // event details such as the last mouseDown target.
    // We handle this by setting a flag to let us know we're explicitly selecting right now.
    if (EH._settingTextSelection) return true;

    // If the user is drag-selecting inside form items, allow selection to occur.
    // Don't allow selection to occur if the user is already performing an ISC recognized drag
    // and passes over a form item.
    
    var wd = EH.getWindow(),
        nativeTarget = wd.event ? wd.event.srcElement : null,
        mouseDownNativeTarget = EH.mouseDownEvent ? EH.mouseDownEvent.nativeTarget : null;

    if (nativeTarget && mouseDownNativeTarget == nativeTarget && nativeTarget.form
         && !EH.dragging) 
    {
        return true;
    }
    
    
    
    // Allow text selection if
    // - theres no target / mouseDownTarget canvas (don't interfere with native selection)
    // - mouseDown target doesn't disallow text selection
    // - mouseMove target doesn't disallow text selection 
    // - we're not performing a smartclient drag operation
    //
    // OnSelectStart is triggered from any type of selection (drag selection, shift+arrow 
    // keys, programmatic selection).
    // If this is a drag-selection, we want to check the lastMouseDown target
    // If the mouse is not down this is not a drag selection - don't bother checking for 
    // the last mouseDownTarget disallowing selection.
    // In this case getEventTargetCanvas(...) will still get us a pointer to the element
    // on which selection occurred from event.srcElement (set even though this may not be a
    // mouse event).
    
    if (isc.EH._allowTextSelection) return true;
    var mouseDownTarget = isc.EH.mouseIsDown() ? EH.mouseDownTarget() : null,
        target = EH.getEventTargetCanvas(wd.event);

    
    var dragging = (EH.dragging || EH.dragTarget) && EH.dragOperation != EH.DRAG_SELECT;
    var allowSelection = !dragging && 
                         (mouseDownTarget != null ? 
                            mouseDownTarget._allowNativeTextSelection() : true) &&
                         (target != null ? 
                            target._allowNativeTextSelection() : true);
    if (allowSelection) return true;
    return EH.killEvent();
},



// handle the 'onselectionchange' event.  This is an IE specific event.

_$selectionChange:"selectionChange",
handleSelectionChange : function (event) {

    if (!event) event = window.event;

    
        var EH = isc.EH;

    var lastEvent = EH.lastEvent;
    
     
    var nativeTarget = isc.Element._getElementFromSelection(document);
    if (nativeTarget) {
        // derive the target canvas from the target element 
        
        var targetCanvas = EH.getEventTargetCanvas(event, nativeTarget);

        lastEvent.nativeKeyTarget = nativeTarget
        lastEvent.keyTarget = targetCanvas;
        lastEvent.eventType = this._$selectionChange;
        
        if (targetCanvas) {
            targetCanvas.keyTarget = targetCanvas;
            EH.bubbleEvent(lastEvent.keyTarget, "selectionChange");
        }
    }
    
    // We could return false here to cancel the selection change 
    return true;
},

// native "onhelp" event - IE only
// This occurs when the user hits the f1 key and appears to be the only way to 
// cancel the native help dialog in response to f1 keypress in IE
// Handle this event by firing a synthetic keyPress event, allowing the user to return false
// and suppress the native behavior

handleNativeHelp : function () {
    
    // call any native handler that we may have clobbered (manually for speed)
    
    if (this._documentOnHelp) {
        if (this._documentOnHelp() == false) return false;
    }
    if (this._windowOnHelp) {
        if (this._windowOnHelp() == false) return false;
    }
    
    // allow 'handleNativeKeyDown' to actually fire developer defined keyDown and keyPress
    // handlers, and if they return false, we'll return false here, killing the native onhelp 
    // behavior.
    return isc.EH._handleNativeKeyDown(window.event, true);
},

//> @classMethod EventHandler.setDragTrackerImage()
// This API may be called to set the native HTML5 drag tracker image. The <code>x</code> and
// <code>y</code> parameters may be specified to affect the placement of the drag tracker image
// relative to the mouse cursor. The size of the drag tracker image is the intrinsic size of the
// image. Browsers may apply certain visual effects (such as a slight transparency) to this image.
// <p>
// Can only be called during the +link{Canvas.dragStart()} event (or methods called during the
// handling of that event).
// <p>
// <b>NOTES:</b>
// <ul>
// <li>Not supported in Opera 12.x or Safari.</li>
// <li>For best results, this image should be preloaded. Otherwise, the image might not appear
// for the first drag using this image.</li>
// <li>This API does not work in Chrome or Firefox on Windows 7 if the "Use visual styles on windows and buttons"
// setting is turned off.</li>
// </ul>
// @param src (SCImgURL) image source
// @param [x] (int) offset-x from the mouse cursor
// @param [y] (int) offset-y from the mouse cursor
// @visibility external
//<

setDragTrackerImage : function (src, x, y) {
    var lastEvent = this.lastEvent,
        lastDOMevent,
        dt;
    if (!isc.Browser.hasNativeDrag ||
        lastEvent == null ||
        (lastDOMevent = lastEvent.DOMevent) == null ||
        (dt = lastDOMevent.dataTransfer) == null ||
        dt.setDragImage == null ||
        lastDOMevent.type != this._$dragstart ||
        !this.dragTarget)
    {
        return;
    }

    
    if (isc.Browser.isSafari && !isc.Browser.isChrome) return;

    var imgElem = document.createElement("img");
    imgElem.src = this.dragTarget.getImgURL(src == null ? isc.Canvas._blankImgURL : src);

    

    x = x << 0;
    y = y << 0;

    dt.setDragImage(imgElem, x, y);
},


_$encodedDragTypePrefix: "application/x-isc-dragtype",
_currentDragTypeEncodingSchemeVersion: 0,
encodeDragType : function (dragType) {
    if (!dragType) return this._$encodedDragTypePrefix + this._currentDragTypeEncodingSchemeVersion.toString(36);

    var sb = isc.SB.create(),
        lastPos = 0,
        len;
    sb.append(this._$encodedDragTypePrefix, this._currentDragTypeEncodingSchemeVersion.toString(36));
    for (var i = 0, len = dragType.length; i < len; ) {
        var hi = dragType.charCodeAt(i++),
            codePoint = hi,
            startI = i;
        // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/charCodeAt
        if (0xD800 <= hi && hi <= 0xDBFF) {
            var low = dragType.charCodeAt(i++);
            codePoint = ((hi - 0xD800) * 0x400) + (low - 0xDC00) + 0x10000;
        }

        // http://www.unicode.org/charts/PDF/U0000.pdf
        if ((0x30 <= codePoint && codePoint <= 0x39) ||
            (0x61 <= codePoint && codePoint <= 0x7A))
        {
            continue;
        }

        sb.append(dragType.substring(lastPos, startI - 1), '_', codePoint.toString(16), '_');
        lastPos = i;
    }
    sb.append(dragType.substring(lastPos, len));
    return sb.release();
},

_$utiPrefix: "dyn.a",
_utiLUT: {
    "a":  0, "b":  1, "c":  2, "d":  3, "e":  4,
    "f":  5, "g":  6, "h":  7, "k":  8, "m":  9,
    "n": 10, "p": 11, "q": 12, "r": 13, "s": 14,
    "t": 15, "u": 16, "v": 17, "w": 18, "x": 19,
    "y": 20, "z": 21, "0": 22, "1": 23, "2": 24,
    "3": 25, "4": 26, "5": 27, "6": 28, "7": 29,
    "8": 30, "9": 31
},
decodeDragDataItemTypeString : function (typeStr) {
    if (!typeStr) return null;
    typeStr = typeStr.toLowerCase();

    
    if (typeStr.startsWith(this._$utiPrefix)) {
        var lookupTable = this._utiLUT,
            outputCharCodes = [];
        // Each char of the base32-encoded string provides 5 bits of data.
        var numBits = 0,
            bits = 0;
        for (var i = this._$utiPrefix.length; i < typeStr.length; ++i) {
            var val = lookupTable[typeStr[i]];
            val <<= 3;
            bits |= val >>> numBits;
            numBits += 5;
            if (numBits >= 8) {
                outputCharCodes.add(bits & 255);
                numBits -= 8;
                if (numBits > 0) bits = (val << (5 - numBits)) & 255;
                else bits = 0;
            }
        }

        typeStr = String.fromCharCode.apply(String, outputCharCodes);
        var startPos = typeStr.indexOf(this._$encodedDragTypePrefix);
        if (startPos < 0) return null;
        var endPos = typeStr.indexOf(':', startPos + this._$encodedDragTypePrefix.length);
        if (endPos < 0) endPos = typeStr.length;
        typeStr = typeStr.substring(startPos, endPos);

    } else if (!typeStr.startsWith(this._$encodedDragTypePrefix)) {
        return null;
    }

    var str = typeStr.substring(this._$encodedDragTypePrefix.length),
        encodingSchemeVersion;
    if (// Empty string (no version)
        !str ||
        // or version too new
        (encodingSchemeVersion = parseInt(str[0], 36)) > this._currentDragTypeEncodingSchemeVersion)
    {
        return null;
    }

    var sb = isc.SB.create();
    if (0 == encodingSchemeVersion) {
        var lastPos = 0;
        for (var pos = str.indexOf('_'); pos >= 0; pos = str.indexOf('_', lastPos + 1)) {
            sb.append(str.substring(lastPos + 1, pos));
            lastPos = str.indexOf('_', pos + 1);
            if (lastPos < 0) return null;
            var codePoint = parseInt(str.substring(pos + 1), 16);
            if (isNaN(codePoint)) continue;
            if (codePoint >= 0x10000) {
                // http://en.wikipedia.org/wiki/UTF-16#Code_points_U.2B10000_to_U.2B10FFFF
                // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/fromCharCode
                var d = codePoint - 0x10000,
                    hi = (d >> 10) + 0xD800,
                    low = (d & 0x3FF) + 0xDC00;
                sb.append(String.fromCharCode(hi, low));
            } else {
                if (0xD800 <= codePoint && codePoint <= 0xDFFF) return null;

                sb.append(String.fromCharCode(codePoint));
            }
        }
        sb.append(str.substring(lastPos + 1));
    }
    return sb.release();
},

_getEncodedDragType : function (dt) {
    var types;
    if (dt == null || (types = dt.types) == null) return null;

    var len = types.length;
    for (var i = 0; i < len; ++i) {
        var type = types[i];
        if (type && type.startsWith(this._$encodedDragTypePrefix)) {
            return type;
        }
    }

    // Look for UTIs
    for (var i = 0; i < len; ++i) {
        var type = types[i];
        if (type && type.startsWith(this._$utiPrefix)) {
            // Need to check that this UTI encodes a drag type.
            var dragType = this.decodeDragDataItemTypeString(type);
            if (dragType != null) return type;
        }
    }

    return null;
},

_getDragType : function (dt) {
    var type = this._getEncodedDragType(dt);
    if (type == null) return null;
    return this.decodeDragDataItemTypeString(type);
},

//> @classMethod EventHandler.getNativeDragData()
// For a cross-frame drag, retrieves the data made available when the drag was initiated in the
// foreign frame via +link{EventHandler.setNativeDragData()}.
// <p>
// Can only be called during the +link{Canvas.drop} event (or methods called during the handling
// of that event, such as +link{ListGrid.recordDrop}); will return null if called at any other
// time, or if called during a non-HTML5 drag and drop.
// @return (Object) data made available in the foreign frame
// @visibility external
//<
_$drop: "drop",
getNativeDragData : function () {
    var lastEvent = this.lastEvent,
        lastDOMevent;
    if (!isc.Browser.hasNativeDrag ||
        lastEvent == null ||
        (lastDOMevent = lastEvent.DOMevent) == null ||
        lastDOMevent.dataTransfer == null ||
        lastDOMevent.type != this._$drop)
    {
        return null;
    }

    var dt = lastDOMevent.dataTransfer,
        encodedDragData;
    if (isc.Browser.isIE) {
        encodedDragData = dt.getData("Text");
    } else {
        var type = this._getEncodedDragType(dt);
        if (type == null) return null;
        encodedDragData = dt.getData(type);
    }

    var dragData = null;
    
    try {
        if (encodedDragData != null) dragData = isc.JSON.decode(encodedDragData);
    } catch (e) {
        this.logWarn("Failed to decode as JSON: " + e);
    }

    return dragData == null ? null : dragData.data;
},

//> @classMethod EventHandler.setNativeDragData()
// Sets the data available in a cross-frame HTML5 drag (see +link{Canvas.useNativeDrag}).
// <p>
// Data provided to this method must be valid for serialization to JSON via the
// +link{JSONEncoder}, or can simply be a String.
// <p>
// Can only be called during the +link{Canvas.dragStart()} event (or methods called during the
// handling of that event).
// <p>
// Do not pass in sensitive data (e.g. passwords, auth/session tokens, credit card numbers, SSNs, etc.).
// @param data (Object | String) data to make available to foreign frames
// @param [strData] (String) text data to set. This is the text that users may see if the drag
// is dropped into an external application such as Notepad or a non-Smart&#67;lient/Smart&nbsp;GWT
// web application.
// @visibility external
//<
_dragDataEncodeSettings: {
    dateFormat: "xmlSchema",
    prettyPrint: false,
    skipInternalProperties: true,
    strictQuoting: true
},
_$dragstart: "dragstart",
setNativeDragData : function (data, strData, dragType) {
    var lastEvent = this.lastEvent,
        lastDOMevent;
    if (!isc.Browser.hasNativeDrag ||
        lastEvent == null ||
        (lastDOMevent = lastEvent.DOMevent) == null ||
        lastDOMevent.dataTransfer == null ||
        lastDOMevent.type != this._$dragstart ||
        !this.dragTarget)
    {
        return;
    }

    if (dragType == null) dragType = this.dragTarget.dragType;

    if (isc._windowUUID == null) isc._windowUUID = isc.Math.randomUUID();
    var dragData = {
        iscVersion: isc.version,
        iscVersionNumber: isc.versionNumber,
        windowUUID: isc._windowUUID,
        dragType: dragType,
        data: data
    };
    var encodedDragData = isc.JSON.encode(dragData, this._dragDataEncodeSettings);

    var dt = lastEvent.DOMevent.dataTransfer;

    // IE only supports "Text" and "URL" data types:
    // http://msdn.microsoft.com/en-us/library/ie/ms536744.aspx
    if (isc.Browser.isIE) {
        dt.setData("Text", encodedDragData);

    } else {
        dt.setData(this.encodeDragType(dragType), encodedDragData);
        if (strData == null || (strData = String(strData).trim()).length == 0) strData = "\u00A0";
        dt.setData("Text", strData);
    }
},

_effectAllowedMap: {
    "none": "none",
    "copy": "copy",
    "copyLink": "copyLink",
    "copylink": "copyLink",
    "copyMove": "copyMove",
    "copymove": "copyMove",
    "link": "link",
    "linkMove": "linkMove",
    "linkmove": "linkMove",
    "move": "move",
    "all": "all",
    "uninitialized": "uninitialized"
},

// native ondragstart
// the ondragstart event happens if you try to drag some selected text or an image - it allows
// you to drop the selected text into any text editor, or save the image to the desktop.  If we
// don't cancel the event, IE takes over the drag, modifies the cursor and stops sending
// mouseMove.

handleNativeDragStart : function (DOMevent) {
    // Check if the widget has useNativeDrag:true.
    if (isc.Browser.hasNativeDrag && DOMevent.dataTransfer) {
        var EH = isc.EH,
            dt = DOMevent.dataTransfer,
            event = EH.getMouseEventProperties(DOMevent),
            target = event.target;
        if (target != null && (target = target._getNativeDragTarget()) != null) {
            event.target = target;

            
            if (!target.useNativeDrag) return false;

            if (isc.Browser.isIE) {
                if (target.dragType == null) {
                    this.logWarn("No dragType string is set on " + target.getID() + ". Canceling native drag...");
                    return false;
                }

                var crossFrameDrag = isc.Canvas.getCrossFrameDragByDragType && isc.Canvas.getCrossFrameDragByDragType(target.dragType);
                if (crossFrameDrag == null) {
                    this.logWarn("No cross-frame drag settings have been registered for dragType:'" +
                                 target.dragType + "'. Canvas.registerCrossFrameDrags() must be " +
                                 "called to register cross-frame drag settings for this dragType. " +
                                 "Canceling native drag...");
                    return false;
                }

                dt.effectAllowed = EH._effectAllowedMap[crossFrameDrag.effectAllowed];
            } else {
                dt.effectAllowed = "copy";
            }

            // Set null drag data by default because Firefox 22.0 cancels the drag if no data
            // is set on 'dragstart'.
            if (!(isc.isA.DataBoundComponent && isc.isA.DataBoundComponent(target))) {
                EH.setNativeDragData(null, null, target.dragType);

            } else {
                EH.setNativeDragData(target.cloneDragData(), null, target.dragType);
            }
            EH.dragTarget = target;
            EH.dragOperation = "drag";
            var returnVal = EH.handleDragStart(true);
            EH.handleDragMove();
            return returnVal;
        }
    }

    // If an ISC drag is occurring, return false to suppress the native drag so we can
    // continue to get mouse-moves and respond to the drag.
    if (isc.EH.dragTarget) return false;

    
    var target = isc.EH.mouseDownTarget();

    // if within a Canvas, allow the drag if you can select text within the Canvas.
    // This will allow the user to drag out a selected chunk of text to a text editor, etc. 
    
    if (target) return !!(target._allowNativeTextSelection());

    // call any native handler that we may have clobbered (manually for speed)
    if (this._documentDragStart) return this._documentDragStart();
    if (this._windowDragStart) return this._windowDragStart();

    
},


_useCrossFrameDragCleanupTimer: isc.Browser.isMoz && isc.Browser.version < 10,

_crossFrameDragCleanupDelayMillis: 600,
_setCrossFrameDragCleanupTimer : function () {
    var EH = this;
    if (EH._crossFrameDragCleanupTmrID != null) isc.Timer.clear(EH._crossFrameDragCleanupTmrID);
    EH._crossFrameDragCleanupTmrID = isc.Timer.setTimeout(EH._crossFrameDragCleanupAction, EH._crossFrameDragCleanupDelayMillis);
},
_crossFrameDragCleanupAction : function () {
    var EH = isc.EH;
    delete EH._crossFrameDragCleanupTmrID;
    if (EH.crossFrameDragging) {
        EH.artificialDragTarget.dragType = null;

        EH._handleNativeDragEnd(EH.lastEvent.DOMevent);
    } else if (EH.nativeDragging) {
        if (EH.dragMoveTarget) EH.dragMoveTarget.hide();
    }
},

_dropEffectsByEffectAllowed: {
    "none": "none",
    "copy": "copy",
    "copyLink": "copy",
    "copylink": "copy",
    "copyMove": "copy",
    "copymove": "copy",
    "all": "copy",
    "link": "link",
    "linkMove": "link",
    "linkmove": "link",
    "move": "move"
},
_$none: "none",
_handleNativeDragOver : function (DOMevent) {
    var dt = DOMevent.dataTransfer,
        initialDropEffect = dt.dropEffect,
        EH = isc.EH;

    
    if (dt.files != null && dt.files.length > 0) return;
    var types = dt.types,
        hasFiles = false;
    if (types != null) {
        for (var ri = types.length; ri > 0; --ri) {
            if (types[ri - 1] == "Files") {
                hasFiles = true;
                break;
            }
        }
    }

    if (!hasFiles) dt.dropEffect = EH._$none;

    var effectAllowed;

    
    if (isc.Browser.isIE) {
        try {
            effectAllowed = EH._effectAllowedMap[dt.effectAllowed];
        } catch (e) {
            effectAllowed = initialDropEffect;
        }
    } else {
        effectAllowed = dt.effectAllowed;
    }

    // This might be a cross-frame drag.
    if (!EH.nativeDragging) {
        var dragType = null;

        if (isc.Browser.isIE) {
            // Look up the cross-frame drag settings corresponding to the current effectAllowed
            // value.
            var crossFrameDrag = isc.Canvas.getCrossFrameDragByEffectAllowed(effectAllowed);

            // If no cross-frame drag is registered (see Canvas.registerCrossFrameDrags()), then
            // we don't know about this, so leave dropEffect set to "none" and return. By not
            // returning false here, the browser won't allow a drop in the application.
            if (crossFrameDrag == null) {
                return;
            }

            dragType = crossFrameDrag.dragType;
            
        } else {
            dragType = this._getDragType(dt);

            if (dragType == null) return;
        }

        // At this point we either obtained the dragType from the cross-frame drag settings or
        // recognize one of the drag data types as one of our special encoded type strings.

        // Initialize the dropEffect to "none".
        dt.dropEffect = EH._$none;

        // Create an artificial dragTarget.
        if (EH.artificialDragTarget) EH.artificialDragTarget.destroy();
        // faux createAutoChild
        var artificialDragTargetConstructor = EH.artificialDragTargetConstructor || EH.artificialDragTargetDefaults._constructor;
        EH.dragTarget = EH.artificialDragTarget = isc[artificialDragTargetConstructor].create(
            {
                autoDraw: false,
                _generated: true
            }, EH.artificialDragTargetDefaults, EH.artificialDragTargetProperties, {
                left: DOMevent.pageX,
                top: DOMevent.pageY,
                dragType: dragType
            }
        );

        var event = EH.getMouseEventProperties(DOMevent);
        event.target = EH.dragTarget;

        EH.dragOperation = "drag";
        EH._mouseIsDown = true;
        EH.mouseDownEvent = isc.addProperties({}, event);
        EH.handleDragStart(true);
        EH.crossFrameDragging = true;

        
        if (EH._useCrossFrameDragCleanupTimer) EH._setCrossFrameDragCleanupTimer();
    } else {
        if (EH._useCrossFrameDragCleanupTimer) EH._setCrossFrameDragCleanupTimer();

        // If a native drag is in progress, initialize the dropEffect to "none".
        dt.dropEffect = EH._$none;

        
        var lastEvent = EH.lastEvent;
        if (lastEvent != null &&
            lastEvent.screenX == DOMevent.screenX &&
            lastEvent.screenY == DOMevent.screenY)
        {
            if (lastEvent._lastDragOverReturnVal === false) {
                dt.dropEffect = EH._dropEffectsByEffectAllowed[effectAllowed];
            }
            return lastEvent._lastDragOverReturnVal;
        }
    }

    EH.handleMouseMove(DOMevent);

    
    var returnVal,
        dropTarget = EH.dropTarget;
    if (dropTarget && dropTarget.canAcceptDrop && dropTarget.willAcceptDrop()) {
        returnVal = false;
        dt.dropEffect = EH._dropEffectsByEffectAllowed[effectAllowed];
    }
    EH.lastEvent._lastDragOverReturnVal = returnVal;
    return returnVal;
},

_handleNativeDragEnter : function (DOMevent) {
    var EH = isc.EH;

    
    EH._lastDragEnterTarget = (DOMevent.srcElement || DOMevent.target);

    
    if (isc.Browser.isIE) {
        EH.handleMouseMove(DOMevent);

        
        var returnVal;
        if (EH.dropTarget && EH.dropTarget.canAcceptDrop && EH.dropTarget.willAcceptDrop()) {
            if (DOMevent.preventDefault) DOMevent.preventDefault();
            returnVal = false;
        }
        EH.lastEvent._lastDragOverReturnVal = returnVal;
        return returnVal;
    }
},

_handleNativeDragLeave : function (DOMevent) {
    var EH = isc.EH;
    
    if (EH._lastDragEnterTarget == (DOMevent.srcElement || DOMevent.target)) {
        EH._lastDragEnterTarget = null;

        if (!EH._useCrossFrameDragCleanupTimer) {
            if (EH.crossFrameDragging) {
                
                EH.artificialDragTarget.dragType = null;

                EH._handleNativeDragEnd(DOMevent);
            } else if (EH.nativeDragging) {
                if (EH.dragMoveTarget) EH.dragMoveTarget.hide();
                
                if (EH.dragTarget && EH.dragTarget.useNativeDrag && EH.dropTarget) {
                    EH.handleEvent(EH.dropTarget, EH.DROP_OUT); //clear visible state
                    EH.dropTarget = null;
                }
            }
        }
    }
},

_handleNativeDragEnd : function (DOMevent) {
    var EH = isc.EH;
    EH.handleMouseUp(DOMevent);
},

_handleNativeDrop : function (DOMevent) {
    var EH = isc.EH,
        wasNativeDragging = EH.nativeDragging;
    EH.handleMouseUp(DOMevent);
    // Only return false if EH.nativeDragging was true. Otherwise, returning false here might disable
    // a drag and drop of files (for example, onto a file input).
    if (wasNativeDragging) return false;
},


_handleTransitionEnd : function (DOMevent) {
    var EH = isc.EH;

    var eventInfo = {
        DOMevent: DOMevent,
        eventType: EH.TRANSITION_END,
        nativeTarget: DOMevent.target,
        prefixedPropertyName: DOMevent.propertyName,
        elapsedTime: DOMevent.elapsedTime
    };
    if (DOMevent.propertyName != null && DOMevent.propertyName.startsWith(isc.Element.vendorCSSPrefix)) {
        eventInfo.propertyName = DOMevent.propertyName.substring(isc.Element.vendorCSSPrefix.length);
    }
    var target = eventInfo.target = EH.getEventTargetCanvas(DOMevent, eventInfo.nativeTarget, eventInfo);
    return EH.handleEvent(target, EH.TRANSITION_END, eventInfo);
},


// Handle a page-level resize event.
handleResize : function (DOMevent) {
    //Log.logWarn("page-level resize event");
    // delay briefly to avoid getting flooded by page-level resize events during drag resize on
    // Windows IE
    if (isc.EH.resizeTimer == null) {
        isc.EH.resizeTimer = isc.Timer.setTimeout("isc.EH._pageResize()", 0);
    }
    // Always return true. This will allow any 'window.onresize' handlers set up before
    // ISC was loaded to fire.
    
    return true;
},

// Fired when the user rotates a mobile device:
// Safari / iPhone and iPad only

handleOrientationChange : function (DOMEvent) {
    this._fireResizeEvent();
},


_pageResizePollMethod : function () { isc.EH._pageResize(true); },

// Note the "polling" param indicates that this method is not called from a native browser resize
// event - it either comes from the polling code if isc.Page.pollPageSize is true, or from some other
// case where we want to verify that the size hasn't changed.
// If this parameter is passed and the page size is not changed, this method will no-op
_pageResize : function (polling) {

    isc.EH.resizeTimer = null;
    var orientation = isc.Page.getOrientation();
    // !polling implies this came from a real resize event and the size has changed
    if (!polling) {

        // This both records the reported width, and ensures that it's up to date.
        this._previousInnerWidth = isc.Page.getWidth(window, true);
        this._previousInnerHeight = isc.Page.getHeight(window, true);
        
        if (this.resizingPollTimer != null) isc.Timer.clearTimeout(this.resizingPollTimer);
        this.resizingPollTimer = isc.Timer.setTimeout(this._pageResizePollMethod, 100);
    } else {
        // We want to force a recalculation of width / height here.
        // If the value has changed, re-run the resized handler to resize children etc.
        var newWidth = isc.Page.getWidth(window, true),
            newHeight = isc.Page.getHeight(window, true),
            unchanged = (orientation ==  this.currentOrientation) &&
                        (newWidth == this._previousInnerWidth && 
                         newHeight == this._previousInnerHeight)

        // If we're polling for content changes that introduce / hide scrollbars, 
        // re-run this method on every idle
        if (isc.Page.pollPageSize) {
            isc.Page.setEvent(isc.EH.IDLE, this._pageResizePollMethod, isc.Page.FIRE_ONCE);
        }
        // Don't actually fire the handler if there was no resize
        if (unchanged) return;
        
        // record the size so we can no-op next time this method is run
        this._previousInnerWidth = newWidth;
        this._previousInnerHeight = newHeight;
    }
    this._fireResizeEvent(orientation);
},

currentOrientation:isc.Page.getOrientation(),
_currentWidth:isc.Page.getWidth(),

_fireResizeEvent : function (orientation) {
    isc.Page.handleEvent(null, isc.EH.RESIZE);

    var width = isc.Page.getWidth();
    if (width == this._currentWidth) return;

    // Fire orientationChange event from resize event rather only on the native
    // onOrientationChange - this means we can fire it
    // on a desktop browser if the user drags from a portrait type sizing to a landscape
    // type sizing
    
    if (orientation == null) orientation = isc.Page.getOrientation();
    if (orientation != this.currentOrientation) {
        this._currentWidth = width;
        this.currentOrientation = orientation;
        isc.Page.handleEvent(null, isc.EH.ORIENTATION_CHANGE);
    }
},

// handle a native "mousewheel" event, currently only available in IE6 and above, and Mozilla

handleMouseWheel : function (DOMevent) {
    
        var EH = isc.EH;
    if (!DOMevent) DOMevent = EH.getWindow().event;
    var nativeTarget = (DOMevent.srcElement || DOMevent.target);
    if (EH.eventHandledNatively(DOMevent.type, nativeTarget)) return EH._handledNativelyReturnVal;
    
    EH.getMouseEventProperties(DOMevent);
    
    // Pass to the appropriate widget, and stop if this returns false.
    var target = EH.lastEvent.target;
    var returnValue;
    if (EH.targetIsEnabled(target)) {  
        returnValue = EH.bubbleEvent(target, EH.eventTypes.MOUSE_WHEEL);
    }

    if (returnValue == false) {
        
        if (DOMevent.preventDefault) DOMevent.preventDefault();
        return false;
    }
    // Return true to avoid interfering with native events
    return true;
},

//> @classMethod EventHandler.getWheelDelta()
// Applies to +link{canvas.mouseWheel(),mouseWheel} events only.
// Returns a numeric value indicating how far the mouse wheel was rotated. This value will be
// positive if the user scrolled the mousewheel forward or up, or negative if scrolled in the
// other direction. For a standard wheel-mouse, an increment of 1 relates to the smallest
// possible rotation of the mouse wheel. For other scrolling devices, such as scroll 
// gestures on a track pad, wheel delta may be reported in finer grained increments 
// (causing this method to return a fractional value).
// <P>
// Note that behavior for trackpad scroll-gestures may differ by browser, but where 
// separate vertical and horizontal scroll information is available, this method
// refers to a vertical scroll gesture.
// <P>
// Developers should also be aware
// that some browsers and operating systems allow the user to configure the sensitivity
// of the mouse wheel or trackpad, which may change this value.
//
// @deprecated in favor of +link{EventHandler.getWheelDeltaY()}
// @return (float) numeric value indicating how far the mouse wheel was rotated.
// @visibility external
//<
// canvas.scrollWheelDelta is currently not exposed - we may want to interlink docs with
// that attribute if it becomes exposed.
getWheelDelta : function (event) {
    return (event || this.lastEvent).wheelDelta;
},

//> @classMethod EventHandler.getWheelDeltaX()
// Horizontal scroll delta reported by a +link{canvas.mouseWheel(),mouseWheel} event
// (such as a horizontal swipe on a track-pad).
// <P>
// Returns a numeric value indicating how far the mouse wheel was rotated / the magnitude
// of the scroll gesture. This value will be
// positive if the user scrolled the mousewheel to the right, negative if scrolled in the
// other direction. 
// 
// @see EventHandler.getWheelDeltaY()
// @return (float) numeric value indicating how far the mouse wheel was rotated.
// @visibility external
//<
// canvas.scrollWheelDelta is currently not exposed - we may want to interlink docs with
// that attribute if it becomes exposed.
getWheelDeltaX : function (event) {
    return (event || this.lastEvent).wheelDeltaX;
},

//> @classMethod EventHandler.getWheelDeltaY()
// Applies to +link{canvas.mouseWheel(),mouseWheel} events only.
// Returns a numeric value indicating how far the mouse wheel was rotated. This value will be
// positive if the user scrolled the mousewheel forward or up, or negative if scrolled in the
// other direction. For a standard wheel-mouse, an increment of 1 relates to the smallest
// possible rotation of the mouse wheel. For other scrolling devices, such as scroll 
// gestures on a track pad, wheel delta may be reported in finer grained increments 
// (causing this method to return a fractional value).
// <P>
// Note that behavior for trackpad scroll-gestures may differ by browser, but where 
// separate vertical and horizontal scroll information is available, this method
// refers to a vertical scroll gesture.
// <P>
// Developers should also be aware
// that some browsers and operating systems allow the user to configure the sensitivity
// of the mouse wheel or trackpad, which may change this value.
//
// @see EventHandler.getWheelDeltaX()
// @return (float) numeric value indicating how far the mouse wheel was rotated.
// @visibility external
//<
// canvas.scrollWheelDelta is currently not exposed - we may want to interlink docs with
// that attribute if it becomes exposed.
getWheelDeltaY : function (event) {
    return (event || this.lastEvent).wheelDeltaY;
},


// Handle a "DOMMouseScroll" event
// This is the event Mozilla fires when the user spins the mouse scroll wheel.
// Fall through to the standard handleMouseWheel functionality, which will pick up the details
// for the event and cancel native behavior if appropriate

handleDOMMouseScroll : function (e) {
    return isc.EH.handleMouseWheel(e);
},

// Handle a scroll event
handleScroll : function (DOMevent) {
    
	//window.status = 'handleScroll ' + timeStamp();
    //return (EH.handleEvent(EH.getEventTargetCanvas(DOMevent), "_handleCSSScroll") != false);
},



prepareForLinkDrag : function (dragTarget, linkID) {
	this.dragTarget = (isc.isA.String(dragTarget) ? 
                       this.getWindow()[dragTarget] : dragTarget);
	this.dragTargetLink = linkID;
	return false;
},


// Drag Tracker
// ----------------------------------------------------------------------------------------

//>	@classMethod	isc.EventHandler.setDragTracker()
// Set the HTML for the drag tracker that follows the mouse during a drag and drop interaction.
// <P>
// Your canvas can use this routine to set the drag tracker to whatever HTML you want like so:
// <pre>
//    dragStart : function () {
//        isc.EventHandler.setDragTracker('Your contents here');
//    }
// </pre>
//
//		@group	dragDrop, dragTracker
//		@param	html		(string) 	HTML for the tracker
//		@param	[newWidth]	(int)	new width for the tracker. Default value: 10
//		@param	[newHeight]	(int) 	new height for the tracker. Default value: 10
//		@param	[offsetX]	(int)	x-offset for the tracker
//		@param	[offsetY]	(int) 	y-offset for the tracker
//      @param  [properties] (object)   Opportunity to pass in a free-form set of properties 
//                                      for the dragTracker
//  @visibility external
//<

setDragTracker : function (html, newWidth, newHeight, offsetX, offsetY, properties) {
    var dragTracker = this._makeDragTracker(properties);

	// set size (or reset to small size if it was previously set larger)
    newWidth = newWidth || 10;
    newHeight = newHeight || 10;
    dragTracker.resizeTo(newWidth, newHeight);

    // update contents
	dragTracker.setContents(html);

    // redraw right away for responsiveness
    dragTracker.redrawIfDirty("setDragTracker");

    // apply drag offset if specified
    if (offsetX) dragTracker.offsetX = offsetX;
    if (offsetY) dragTracker.offsetY = offsetY;

    // we don't want these new settings to stick globally - require the user to call
    // setDragTracker() every time they want to deviate from the defaults only.  Otherwise any
    // single instance of deviation from defaults would require a setDragTracker() on all other
    // DnD interactions on the page simply to reset back to defaults.
    dragTracker._isCustomized = true;
},


// Create the 'drag tracker' -- a canvas that follows the mouse to indicate
// that something is being dragged.  See  isc.EventHandler.setDragTracker() for 
// details on how to customize the tracker.
_makeDragTracker : function (overrides) {
    if (!this.dragTracker) {
        var defaults = this.dragTrackerDefaults; 
        // set default contents just to make sure the drag tracker is visible if you enable it
        // but neglect to set contents.  NOTE that it's not expected that anyone would actually
        // use a black square and the contents are never restored to a black square.  NOTE also
        // that we don't want to use a background color which would bleed through transparent
        // images.
        defaults.contents = isc.Canvas.imgHTML("[SKIN]black.gif",10,10);
	    this.dragTracker = isc.Canvas.create(defaults, overrides);
    } else if (overrides != null) this.dragTracker.setProperties(overrides);
    return this.dragTracker;
},

// Get a Canvas that draws an outline, whose initial size and position matches the Canvas
// passed as an argument.
getDragOutline : function (target, outlineSize, outlineColor) {
    
    if (!this.dragOutline) {
        this.dragOutline = isc.Canvas.create({
            autoDraw:false,
            overflow:isc.Canvas.HIDDEN
        })
        
        if (isc.Browser.isIE) this.dragOutline.setContents(isc.Canvas.spacerHTML(3200, 2400));
    }

    var outline = this.dragOutline;
    if (isc.Element.getStyleDeclaration(target.dragOutlineStyle)) {
        outline.setStyleName(target.dragOutlineStyle);
    } else {
        outline.setBorder((outlineSize || 1) + "px solid " + (outlineColor || "black"));
    }

    // size the outline so it matches the object being resized
    outline.setPageRect(target.getPageLeft(), target.getPageTop(),
                        target.getVisibleWidth(), target.getVisibleHeight());

    // if this outline will be used for a resize, the min and max sizes of the outline need to
    // match the object being resized
    outline.minWidth = target.minWidth;
    outline.minHeight = target.minHeight;
    outline.maxWidth = target.maxWidth;
    outline.maxHeight = target.maxHeight;


    // if the target wants to stay within its parent, the outline should stay there too
    outline.keepInParentRect = target.keepInParentRect;
    return outline;
},

//> @classMethod EventHandler.getDragRect()
// During a drag with +link{canvas.dragAppearance,dragAppearance} of either "target" or
// "outline", returns the page-relative coordinates of whatever element is being dragged.
// <P>
// Calling this method allows you to write drag and drop logic that works identically even if
// <code>dragAppearance</code> is subsequently changed.
//
// @return (Rect) global (page-relative) coordinates and size of the dragged element, as a
//                       4-element array [left,top,width,height], or null if not dragging
// @group dragdrop
// @visibility external
//<
getDragRect : function () {
    
    var target = this.dragMoveTarget || this.dragTarget;
    if (!target) return null;
    return target.getPageRect();
},



// move whatever component is intended to be moving during the drag (tracker, outline,
// dragTarget itself) 
_moveDragMoveTarget : function () {
    //!DONTCOMBINE

    var EH = this;

    var target = EH.dragMoveTarget;
    if (!target) return true;

    
    //>Moz1.4
    var stayInParent = (isc.Browser.isMoz && isc.Browser.geckoVersion < 20031007 &&
                        !target.keepInParentRect);

    if (stayInParent &&
        (target.parentElement && 
         !target.parentElement.containsPoint(EH.lastEvent.x,EH.lastEvent.y)))
    {
        return true;
    }
    //<Moz1.4

	// move the dragMoveTarget to the event
    isc._useBoxShortcut = true;
    target.moveToEvent(EH.dragOffsetX, EH.dragOffsetY);
    isc._useBoxShortcut = false;

    target.show();
	return true;
},

// Routine to move the object that's being moved via the dragMove mechanism.
_resizeDragMoveTarget : function () {
    //!DONTCOMBINE
    var EH = this;
	// move the dragMoveTarget to the event
	if (EH.dragMoveTarget) EH.dragMoveTarget.resizeToEvent(EH.resizeEdge);
	return true;
},

// Kill the current native event
killEvent : function (DOMevent) {
    if (!DOMevent) DOMevent = isc.EH.getWindow().event;
    DOMevent.cancelBubble = true;
    return false;
},

// Return the value that will stop event bubbling

stopBubbling : function () {
	return isc.EH.STOP_BUBBLING;
},

// Start a timer to fire the synthetic 'idle' event after a short delay.  This should never
// need to be called directly - call Page.setEvent('idle', action) instead.
_$handleIdle:"_handleIdle",
startIdleTimer : function () {
    // idle shouldn't fire until after page load, and the idle timer is kicked off at page
    // load, no use setting timers in between
    if (!isc.Page.isLoaded()) return;

    // start the timer if we don't already have one running
    if (!this.idleTimer) {
        this.idleTimer = isc.Timer.setTimeout({target:isc.EH, methodName:this._$handleIdle}, 
                                              this.IDLE_DELAY);
    }
},

// Call registered actions for the idle event.
_handleIdle : function () {
    // allow a new timer to be set (note: code triggered from idle frequently sets further idle
    // events, so this needs to happen first)
	this.idleTimer = null;

	// handle the page-level idle stuff, as normal
	var result = isc.Page.handleEvent(null,this.IDLE);

	// if there are any remaining actions for the idle event, start the timer again
	if (isc.Page.actionsArePendingForEvent(this.IDLE)) this.startIdleTimer();
	return result;
},

_threadCounter : 0,
_setThread : function (threadCode) {
    // use a rotating counter to distinguish things like successive mouseMoves
    var newThread = threadCode + this._threadCounter++;
    
    if (this._thread != null) this._interruptedThread = this._thread;
    this._thread = newThread;
    if (isc.Log.logIsInfoEnabled("RpcTabTiming")) {
        this._setThreadTimeStamp = isc.timeStamp();
    }
    if (this._threadCounter > 9) this._threadCounter = 0;
},
_clearThread : function () { 
    if (this._threadExitActions != null) {
        if (this.skipTeasOnXHR == "any" && this._xhrSentOnThread) 
        {
            this.logDebug("EventHandler.skipTeasOnXHR is 'any' and this thread " +
                            "has sent an XHR - skipping TEAs");
            this._threadExitActions = null;
        } else if (this.skipTeasOnXHR == "blockingOnly" && 
                                this._blockingXhrSentOnThread) 
        {
            this.logDebug("EventHandler.skipTeasOnXHR is 'blockingOnly' and this " +
                            "thread has sent an XHR - skipping TEAs");
            this._threadExitActions = null;
        } else {
            this.runTeas();
        }
    }
    if (this._interruptedThread) {
        this._thread == this._interruptedThread;
        this._interruptedThread = null;
    } else {
        this._thread = null; 
    }
    this._xhrSentOnThread = null;
    this._blockingXhrSentOnThread = null;
},


_setThreadExitAction : function (action) {
    isc.Timer.setTimeout(action, 0);
    var actions = this._threadExitActions;
    if (actions == null) actions = this._threadExitActions = [];
    actions.add(action);
},


runTeas : function () {
    //!OBFUSCATEOK
    this._thread += "[E]";
    while (this._threadExitActions != null) {
        var actions = this._threadExitActions;
        this._threadExitActions = null;

        if (this.logIsDebugEnabled()) {
            this.logDebug("firing threadExitActions: " + this.echoAll(actions));
        }

        for (var i = 0; i < actions.length; i++) {
            var action = actions[i];
            if (isc.isA.String(action)) isc.eval(action);
            else action();
        }
    }
},

// NOTE: other codes exist in eg FormItem.js for other places where we get a direct call from
// the DOM
_threadCodes : {
    load : "LOD",
    mousedown : "MDN",
    mouseup : "MUP",
    mousemove : "MMV",
    mouseout : "MOU",
    touchstart : "TDN",
    touchmove : "TMVP",
    touchend : "TUP",
    contextmenu : "CXT",
    keypress : "KPR",
    keydown : "KDN",
    keyup : "KUP",
    resize : "RSZ"
},


_$nativeEvents:"nativeEvents",

dispatch : function (handler, event) {
    
    if (!event) event = this.getWindow().event;

    
    if (isc._evalRunning != null) {
        delete isc._evalRunning;
    }

    
    this._setThread(this._threadCodes[event.type] || event.type); 

    
    
    var result;
    if (isc.Log.supportsOnError) {
        result = handler.call(this, event);
    } else {
        
        try {
            result = handler.call(this, event);
        } catch (e) {
            isc.Log._reportJSError(e);
            
            throw e;;
        }
        
    }

    this._clearThread();

    if (result != false && this._replacedEvents[event.type]) {
        var baseResult = this._replacedEvents[event.type](event);
        if (baseResult == false) result = false;
    }

    return result;
},

// assign the handler
_$event: "event",



_$funcBody :
        
            "if (!isc.Browser.isIE && event == null) return;" + 
            ((isc.Browser.isMoz && isc.Browser.version >= 6) || isc.Browser.isChrome ?
             "if(event.defaultPrevented)return;" :
             (isc.Browser.isMoz ? "if(event.getPreventDefault&&event.getPreventDefault())return;" :
               isc.Browser.isSafari ? "if(event.returnValue==false)return;" : ""))
    
    + "var returnVal=argu"+"ments.callee._window.isc.EH.dispatch(argu"+"ments.callee._handler,event);"
    + (!isc.Browser.isIE && isc.Browser.isDOM ? 
    "if(returnVal==false)event.preventDefault();else if(returnVal==isc.EH.STOP_BUBBLING)event.stopPropogation();"
       : "")
    + "return returnVal;"
,
_replacedEvents: {},
_nativeEventName_TypeMap:{
    onmousedown:"mousedown",onmouseup:"mouseup",onclick:"click",ondblclick:"dblclick",
        oncontextmenu:"contextmenu",onmousewheel:"mousewheel",
    onmouseover:"mouseover",onmouseout:"mouseout",onmousemove:"mousemove",

    ondragstart:"dragstart",ondrag:"drag",ondragend:"dragend",
    ondragenter:"dragenter",ondragover:"dragover",ondragleave:"dragleave",
    ondrop:"drop",

    onresize:"resize", onload:"load",onunload:"unload",
    onselecttext:"selecttext",onselectionchanged: "selectionchanged",
    onkeydown:"keydown",onkeyup:"keyup",onkeypress:"keypress"
},
_documentEventHandlers:{},
captureEvent : function (object, nativeEventName, eventName, handler) {

    
    
    var wd = this.getWindow(),
        useEventListeners = this._useEventListeners;
        
    
    //var indirect = new Function(this._$event, this._$funcBody); 
    var indirect = isc._makeFunction(this._$event, this._$funcBody); 
    indirect._window = wd;
    indirect._handler = handler;
    //this.logWarn("indirect created: " + indirect.toString());
    var nativeEventType;
    
    if (!useEventListeners) {
        // If there's a handler on the document object already, fire it synthetically from
        // our handler, so we don't clobber functionality from other JS loaded before us.
        
        if (object[nativeEventName] != null) {
            var nativeEventType = this._nativeEventName_TypeMap[nativeEventName] || nativeEventName.substring(2);
            this._replacedEvents[nativeEventType] = object[nativeEventName];
        }
        
        object[nativeEventName] = indirect;

    //    Using addEventListener / attachEvent rather than assigning directly to
    //    document.onXXX:
    // By default we assign handlers directly to document.onXXX [or window.onXXX].
    // This means that we overwrite any previously defined handlers, and if code executed
    // after the framework loads could also clobber us.
    // We overrwrite pre-existant handlers 'politely' - that is we fire our handler, then, if
    // we didn't return false, fire the pre existant handler with the correct parameters and
    // return the appropriate return value.
    // However this doesn't give us any protection against later code overwriting our onXXX
    // handlers.
    // By contrast we could use "eventListeners", created by document.addEventListener() [or
    // proprietary "attachEvent" in IE]. Events can support multiple listeners, and they
    // can't be clobbered by overwriting document.onXXX.
    // We activate this via the isc_useEventListeners flag.
    // ----
    // Problem with attachEvent/addEventListener as an interop strategy: when a handler
    // cancels an event, the other registered handlers fire anyway.
    //
    // IE: If we are using 'attachEvent' the raw 'onXXX'handler will fire before the 
    // eventListener, and we have no way of knowing whether the handler canceled the event, as
    // event.returnVal is always reported as undefined (even if it has been explicitly set to 
    // false).
    // Hence frameworks have no way of signalling to each other that they have completely 
    // handled an event, and problems like doubled context menus might result.
    // Note: attachEvent and addEventListener are both supported in IE9
    // [running in "IE9" mode]
    //
    // Moz: If we are using 'addEventListener', we have the option of firing before or after the 
    // native onXXX handler fires - this is governed by the third parameter passed to 'attachEvent'. 
    // If we fire first we can call preventDefault() to cancel native behavior but this will not 
    // stop a handler assigned to document.onXXX from firing.
    // A method 'getPreventDefault()' exists on the event object which allows the later handler
    // to detect a previous cancellation so we would be relying on some other library checking 
    // the presence of this flag.
    // Alternatively, if we fire after some other framework's handler, we can check for that 
    // handler having cancelled the native event. The only drawback in this case is that since 
    // our logic fires later we're essentially giving precidence to the other library's handler 
    // - if they show a context menu and kill the event we will not show ours, etc.
    //
    // Safari: Behaves like Moz, with the exception that while event.getPreventDefault() is not
    // available on the event object, you CAN check event.returnValue == false for a previous
    // cancellation.
    //
    // - By default we use "Polite clobbering of the direct handler function" - if a direct 
    // handler was defined before our library loads, we retain the handler, then when the
    // event occurs, we fire our logic first, and if we did not cancel the event, fire the 
    // original handler and propogate its return value back to the browser.
    // This generally achieves interop assuming the SmartClient framework is loaded after
    // any other frameworks on the page.
    // - if ISC can't be loaded last, or the direct handler gets clobbered after loading,
    // the developer can flip on 'isc_useEventListeners' for the application and hope for the
    // best in terms of doubled events (most likely only a problem in IE).
    // --
    // Order of firing:
    // - order (tested with oncontextmenu)
    //   - IE (6 and 7): window.onXXX first, then listeners in what appears to be random order
    //                   [tested with 4 "attachEvent()" calls in addition to setting 
    //                    document.onXXX]
    //   - Moz (1.5.0.3): - with 3rd 'useCapture' param passed to attachEvent():
    //                      listeners first registered -> last registered, then window.onXXX 
    //                    - with 'useCapture' false:
    //                      window.onXXX then listeners first registered -> lastRegistered
    //   - Safari (2.0.3): As with Moz 
    //
    // W3c spec for event listeners: http://www.w3.org/TR/DOM-Level-2-Events/events.html#Events-EventListener 
    } else {        

        if (isc.Browser.isIE && isc.Browser.version < 11) {
            object.attachEvent(nativeEventName, indirect);
        } else if (isc.Browser.isDOM) {

            nativeEventType = this._nativeEventName_TypeMap[nativeEventName] || 
                                  nativeEventName.substring(2);
                                  
            object.addEventListener(nativeEventType, indirect, false);
    
        
        } else {
            this.logWarn("Unable to use event listeners in this browser");
            this._useEventListeners = false;
            return this.captureEvent(object, nativeEventName, eventName, handler);
        }
    }
    
    
    
    if (object === wd.document) {
        var propToRelease = (!useEventListeners || isc.Browser.isIE) ? 
                                                   nativeEventName : nativeEventType;
        this._documentEventHandlers[propToRelease] = indirect;
    }
    
    
},

// Set the page up to capture events that we care about.  
// Called automatically right below its definition.
_needMissedMouseupOutsideWindowWorkAround: isc.Browser.isIE && isc.Browser.version <= 8,
captureEvents : function (wd) {
    var EH = this;
	
    // Convert the public flag to use event listeners rather than directly specifying
    // handlers at the docment level to an internal flag
    if (window.isc_useEventListeners != null) EH._useEventListeners = window.isc_useEventListeners;
    
    
    var reverseEventTypes = isc.makeReverseMap(EH.eventTypes);
    isc.addProperties(EH, {reverseEventTypes:reverseEventTypes});

	if (wd == null) wd = this.getWindow();
	var document = wd.document;
    
	// add a 'load' handler to set up the Page.isLoaded parameter
	isc.Page.setEvent(EH.LOAD, isc.Page.finishedLoading);

    // DOM standard addEventListener and IE's proprietary attachEvent are mechanisms for doing
    // "event listening" - getting notified of events without assigning a function directly to a DOM
    // element.
    // We support both approaches in captureEvent() - switchable via the isc_useEventListeners
    // flag. 
    // See comments in EH.captureEvent() for more on this.
    // Since the "load" event can't be cancelled, and since ISC is hosed if it never gets "load"
    // (eg, nothing responds to events, various actions will be indefinitely postponed), we're using
    // event listening for "load" even if the flag is set to false. 
    // Note:
    //   - IE & Moz: only window.onload fires, not document or document.body onload
    //   - Safari: document, body, and window.onload all fire
    if (isc.Browser.isIE && isc.Browser.version < 11) {
        wd.attachEvent("onload", EH.handleLoad);
    // HACK: Opera: addEventListener for load fires load way too early, during ISC module load,
    // not clear why yet.
    } else if (isc.Browser.isDOM && !isc.Browser.isOpera) {
        wd.addEventListener("load", EH.handleLoad, true);
    } else {
        this.captureEvent(wd, "onload", EH.LOAD, EH.handleLoad);
    }

    
    if (!this._useEventListenerForUnload()) {
        this.captureEvent(wd, "onunload", EH.UNLOAD, EH.handleUnload);
    }

    this.captureEvent(wd, "onresize", EH.RESIZE, EH.handleResize);
    
    // { iscEventName : [DOMObject, nativeName, EHFunction], .. }

    
    if (this._needMissedMouseupOutsideWindowWorkAround) {
        this.captureEvent(document.documentElement, "onmouseleave", EH.MOUSE_LEAVE, EH.handleMouseLeaveDocument);
    }

    this.captureEvent(document, "onmousedown", EH.MOUSE_DOWN, EH.handleMouseDown);
    this.captureEvent(document, "onmousemove", EH.MOUSE_MOVE, EH.handleMouseMove);
    this.captureEvent(document, "onmouseup", EH.MOUSE_UP, EH.handleMouseUp);

    this.captureEvent(document, "onclick", EH.CLICK, EH.handleNativeClick);
    this.captureEvent(document, "ondblclick", EH.DOUBLE_CLICK, EH.handleNativeClick);

    
    this.captureEvent(document, "onscroll", "scroll", EH.handleScroll);
     
    // In IE6 we can capture the mousewheel event
    this.captureEvent(document, "onmousewheel", EH.MOUSE_WHEEL, EH.handleMouseWheel);
    
    // In Moz we also get events on mouse-wheel, but we have to capture them differently.
    if (isc.Browser.isMoz) {
        wd.addEventListener("DOMMouseScroll", EH.handleDOMMouseScroll, true);
    }
    

	// for all Canvii, we synthesize mouseOver/mouseOut by detecting that the target Canvas
    // changed.  However, we care about native mouseOut events in the case that the mouse
    // leaves the browser entirely.
    //this.captureEvent(document, "onmouseover", EH.MOUSE_OVER, EH.killEvent);
    this.captureEvent(document, "onmouseout", EH.MOUSE_OUT, EH.handleNativeMouseOut);

	// get the contextMenu trigger
    this.captureEvent(document, "oncontextmenu", EH.SHOW_CONTEXT_MENU, EH.handleContextMenu);

	// suppress the onselectstart event in a special way
	//	so we can still operate in form fields
    this.captureEvent(document, "onselectstart", EH.SELECT_START, EH.handleSelectStart);
    this.captureEvent(wd, "onselectstart", EH.SELECT_START, EH.handleSelectStart);

    
    if (isc.Browser.isIE) {

        
        this.captureEvent(document, "onselectionchange", 
                          EH.SELECTION_CHANGE, EH.handleSelectionChange);

        
        
    }
    
    if (wd.isc_captureKeyEvents != false) {
        
        this.captureEvent(document, "onkeydown", EH.KEY_DOWN, EH._handleNativeKeyDown);
        this.captureEvent(document, "onkeypress", EH.KEY_PRESS, EH._handleNativeKeyPress);
        this.captureEvent(document, "onkeyup", EH.KEY_UP, EH._handleNativeKeyUp);
        
	}

    if (isc.Browser.hasNativeDrag || isc.Browser.isIE) {
        // ondragStart
        this._windowDragStart = wd.ondragstart;
        this._documentDragStart = document.ondragstart;
        wd.ondragstart = document.ondragstart = null;
        this.captureEvent(document, "ondragstart", EH.DRAG_START, EH.handleNativeDragStart);
    }

    if (isc.Browser.hasNativeDrag) {
        this.captureEvent(document, "ondragend", EH.DRAG_STOP, EH._handleNativeDragEnd);

        this.captureEvent(document, "ondragenter", EH.DROP_OVER, EH._handleNativeDragEnter);
        
        this.captureEvent(document, "ondragover", EH.DROP_MOVE, EH._handleNativeDragOver);
        this.captureEvent(document, "ondragleave", EH.DROP_OUT, EH._handleNativeDragLeave);
        this.captureEvent(document, "ondrop", EH.DROP, EH._handleNativeDrop);
    }

    if (isc.Browser._supportsCSSTransitions) {
        document.addEventListener(isc.Browser._transitionEndEventType, EH._handleTransitionEnd);
    }

	// IE specific 'help' event
	if (isc.Browser.isIE) {
        // onhelp (invoked from f1 keypress only). See comments about keypress handling/cancelling
        // native behavior for why we capture this.
        this._windowOnHelp = wd.onhelp;
        this._documentOnHelp = document.onhelp;
        document.onhelp = wd.onhelp = EH.handleNativeHelp;

        
	}

    //>Touch
    if (isc.Browser.isTouch) {
        // initialize mini state machine used for firing synthetic mousedown/mouseup on Android
        this._handledTouch = EH._touchEventStatus.READY_FOR_TOUCH;

        this.captureEvent(document, "ontouchstart", EH.TOUCH_START, EH._handleTouchStart);
        this.captureEvent(document, "ontouchmove", EH.TOUCH_MOVE, EH._handleTouchMove);
        this.captureEvent(document, "ontouchend", EH.TOUCH_END, EH._handleTouchEnd);
        this.captureEvent(document, "ontouchcancel", EH.TOUCH_CANCEL, EH._handleTouchCancel);
    } else //<Touch
    if (navigator.pointerEnabled) {
        

        this.captureEvent(document, "onpointerdown", EH.POINTER_DOWN, EH._handlePointerDown);
        this.captureEvent(document, "onpointermove", EH.POINTER_MOVE, EH._handlePointerMove);
        this.captureEvent(document, "onpointerup", EH.POINTER_UP, EH._handlePointerUp);
        this.captureEvent(document, "onpointercancel", EH.POINTER_CANCEL, EH._handlePointerCancel);
    }

    
    if (isc.Browser.isMobile) {
        isc.Page.pollPageSize = true;
    }

    // install browser specific routine to check if we need a synhetic keyPress on keyDown
    var helper = null;
    if      (isc.Browser.isMoz)    helper = isc.EH._mozFireKeypressOnKeyDown;
    else if (isc.Browser.isIE)     helper = isc.EH._ieFireKeypressOnKeyDown;
    else if (isc.Browser.isSafari) helper = isc.EH._safariFireKeypressOnKeyDown;
    if (helper) isc.EH.addClassMethods({ _fireKeypressOnKeyDown : helper });
},


_useEventListenerForUnload : function () {
    return (isc.Browser.isSafari && isc.Browser.safariVersion <= 412);
},

// releaseEvents
// Method fired when the page unloads - explicitly clear out event handlers applied to the
// document object

releaseEvents : function (wd) {
    var EH = this;

	if (wd == null) wd = this.getWindow();
	var document = wd.document,
        handlers = this._documentEventHandlers;

    for (var eventName in handlers) {
        if (!this._useEventListeners) {
            document[eventName] = null;
        } else {
            if (isc.Browser.isIE && isc.Browser.version < 11) {
                document.detachEvent(eventName, handlers[eventName]);
            } else if (isc.Browser.isDOM) {
                document.removeEventListener(eventName, handlers[eventName], false);
            }
        }
    }
    // special case for ondragstart which never went through captureEvents and got added to
    // our _documentEventHandlers map
    if (isc.Browser.hasNativeDrag || isc.Browser.isIE) {
        document.ondragstart = wd.onhelp = null;
    }
    if (isc.Browser.isIE) {
        // ditto for onhelp
        document.onhelp = wd.onhelp = null;
    }
    delete this._documentEventHandlers;
},




////////////////
// Cross-browser event property API
////////////////

//>	@classMethod	isc.EventHandler.getLastEvent()
//			Return the last event that was seen.
//
//		@group	mouseEvents
//		@return	(SCEvent) last event
//  @visibility eventhandler
//<
getLastEvent : function () {
	return this.lastEvent;
},

//>	@classMethod	isc.EventHandler.getEventType()
// Get the type of the event
//
//		@group	mouseEvents
//		@param	[event]	(SC Event) Event from a call to getEventProperties().  
//                                 Default is to use isc.EventHandler.lastEvent.
//		@return			(int)	event type 
//  @visibility eventhandler
//<
getEventType : function (event) {
	return (event || this.lastEvent).eventType;
},


//>	@classMethod	isc.EventHandler.getTarget()
// Return the canvas that is the target of the mouse event.
// Returns null if no canvas found.
//
// @group mouseEvents
// @return (Canvas)	event target canvas
// @visibility external
//<
//		@param	[event]	(SC Event) Event from a call to getEventProperties().  
//                                 Default is to use isc.EventHandler.lastEvent.
getTarget : function (event) {
	return (event || this.lastEvent).target;
},


//>	@classMethod	isc.EventHandler.getDragTarget() (A)
//
// Returns the current dragTarget.  This is the component on which the drag and drop
// interaction was initiated.  This only returns something meaningful during a drag and drop
// interaction.
//
// @group	mouseEvents
//
// @return			(Canvas)   The dragTarget.
//
// @see canvas.dragTarget
// @visibility external
//<
getDragTarget : function () {
    return this.dragTarget;
},


//>	@classMethod	isc.EventHandler.getX()
//			Return the page-relative X (horizontal) coordinate of an event.
//
//		@group	mouseEvents
//		@return			(int)	x-coordinate in page coordinate space
//  @visibility external
//<
//		@param	[event]	(ISC Event) Event from a call to getEventProperties().  
//                                 Default is to use isc.EventHandler.lastEvent.
getX : function (event) {
	return (event || this.lastEvent).x;
},

//>	@classMethod	isc.EventHandler.getY()
//			Return the page-relative Y (vertical) coordinate of an event.
//
//		@group	mouseEvents
//		@return			(int)	y-coordinate in page coordinate space
//  @visibility external
//<
//		@param	[event]	(ISC Event) Event from a call to getEventProperties().  
//                                 Default is to use isc.EventHandler.lastEvent.
getY : function (event) {
	return (event || this.lastEvent).y;
},


//>	@classMethod	isc.EventHandler.getScreenX()
//			Return the screen-relative X (horizontal) coordinate of an event.
//
//		@group	mouseEvents
//		@param	[event]	(SC Event) Event from a call to getEventProperties().  
//                                 Default is to use isc.EventHandler.lastEvent.
//		@return			(int)	x-coordinate in screen coordinate space
//  @visibility eventhandler
//<
getScreenX : function (event) {
	return (event || this.lastEvent).screenX;
},

//>	@classMethod	isc.EventHandler.getScreenY()
//			Return the screen-relative Y (vertical) coordinate of an event.
//
//		@group	mouseEvents
//		@param	[event]	(SC Event) Event from a call to getEventProperties().  
//                                 Default is to use isc.EventHandler.lastEvent.
//		@return			(int)	y-coordinate in screen coordinate space
//  @visibility eventhandler
//<
getScreenY : function (event) {
	return (event || this.lastEvent).screenY;
},


//>	@classMethod	isc.EventHandler.mouseIsDown()
//		Is the mouse button currently down?
//		@return	(boolean)	true == mouse is currently down
//		@group	mouseEvents
//  @visibility eventhandler
//<
mouseIsDown : function () {
    return !!(this._mouseIsDown);
},

//>	@classMethod	isc.EventHandler.mouseDownTarget
//		Get the target of the last mouseDown event. May be null if the target has subsequently
//      been destroyed.
//		@return	(Canvas)	Canvas that got the mouseDown event, or null if not on a canvas
//		@group	mouseEvents
//<
mouseDownTarget : function () {
	return (this.mouseDownEvent ? this.mouseDownEvent.target : null);
},


//>	@classMethod	isc.EventHandler.getButtonNum()	(A)
//			Return the number of the button that was pressed:
//				1 == left mouse button (primary)
//				2 == right mouse button (secondary)
//			Tertiary mouse button is not supported as it not commonly found.
//
//		@group	mouseEvents
//		@param	event	(DOM event) DOM event object (as passed by isc.EventHandler)
//		@return			(int)	number of the mouse button	
//  @visibility internal
//<
// which mouse button was pressed?  primary=1, secondary=2	(that's all we support)

getButtonNum : function (event) {
	return (event || this.lastEvent).buttonNum;
},

//>	@classMethod	isc.EventHandler.leftButtonDown()
//			Returns true if the left mouse button is being pressed.
//
//		@platformNotes	Mac:
//		Macintosh platform generally has only one mouse button - ISC considers it to be the "left"
//		mouse button, so this method will return true if the mouse is down on a single-button mouse Mac.
//
//		@group	mouseEvents
//		@return			(Boolean)	true == left button is down, false == up	
//		@see EventHandler.middleButtonDown()
//		@see EventHandler.rightButtonDown()
//      @visibility external
//<
//		@param	[event]	(ISC Event) Event from a call to getEventProperties().  Default is to use isc.EventHandler.lastEvent.
leftButtonDown : function (event) {
	return ((event || this.lastEvent).buttonNum == 1);
},

//>	@classMethod	isc.EventHandler.rightButtonDown()
//			Returns true if the right mouse button is being pressed.
//
//		@platformNotes	Mac:
//		Macintosh platform generally has only one mouse button, and the
//		control key being held down serves the same purpose of the 
//		right mouse button on Windows.  This is taken into account automatically.<br>
//      Opera: 
//      The Opera browser does not pass right mouse button events to JavaScript code by default
//      (the user must explicitly enable this behavior via a menu item). Therefore we 
//      treat <b>Shift+Ctrl+Click</b> as a context click in Opera.
//
//		@group	mouseEvents
//		@return			(Boolean)	true == right button is down, false == up	
//		@see EventHandler.leftButtonDown()
//		@see EventHandler.middleButtonDown()
//      @visibility external
//<
//		@param	[event]	(ISC Event) Event from a call to getEventProperties().  
//                                  Default is to use isc.EventHandler.lastEvent.
rightButtonDown : function (event) {
	if (!event) event = this.lastEvent;
	return (event.buttonNum == 2) || (event.button == 2) || 
           (isc.Browser.isMac && event.ctrlKey) || 
           // Notes:
           // We use shift+ctrl+click because
           // - ctrl + click has native meaning - shows a save-as dialog if it occurs over
           //   an image
           // - alt + click has meaning - it puts focus onto the native browser menus
           // we're unable to suppress either of these
           (isc.Browser.isOpera && (event.ctrlKey && event.shiftKey)) || 
           // Note, for early Safari, we get no event on ctrl+click nor on right button click
           // so if the altKey is down, we'll assume treat this as a context click
           ((isc.Browser.isSafari && (isc.Browser.safariVersion < 125)) && event.altKey);

},

//> @classMethod EventHandler.middleButtonDown() (A)
// Returns true if the middle mouse button is being pressed.
// <p>
// Checking whether the middle mouse button is pressed can be used to implement power user
// shortcuts; however, note that many pointing devices do not have a middle button. Thus, the
// application should <strong>not</strong> require the user to press a middle button in order
// to perform some action.
// @return (boolean) true if the middle mouse button is pressed; false otherwise.
// @see EventHandler.leftButtonDown()
// @see EventHandler.rightButtonDown()
// @group mouseEvents
// @visibility external
//<
middleButtonDown : function (event) {
    return (event || this.lastEvent).buttonNum == 4;
},

// In Nav, early Safari, and current Opera, we don't get real context menu events, so we 
// have to synthesize them in response to mouseDown / mouseUp events.
useSyntheticRightButtonEvents : function () {
    return isc.Browser.isOpera ||
                
                (isc.Browser.isSafari && (isc.Browser.safariVersion < 125));    
},

// Which key was pressed (for keyboard events)

//>	@classMethod	isc.EventHandler.getKeyEventCharacterValue()
//          Returns the numeric characterValue reported by the browser.
//          Only available on keyPress events, and only for character (or ascii control) keys
// @return (int) Numeric character value reported by the browser 
//                  (ASCII value of the key pressed)
// @group	keyboardEvents
//  @visibility external
//<
getKeyEventCharacterValue : function (event) {
	return (event || this.lastEvent).characterValue;
},

//>	@classMethod	isc.EventHandler.getKeyEventCharacter()
//			Return the character for the current key being pressed.
//			Note that this is only set reliably for keyPress events on character keys.
//                  
// @return (string) Character the user entered. May be null for non-character keys. 
//		@group	keyboardEvents
//      @visibility external
//<
getKeyEventCharacter : function (event) {
	return String.fromCharCode(this.getKeyEventCharacterValue(event));
},

//>	@classMethod	isc.EventHandler.getKey()
//			Return the name of the key for the event passed in.
//			Note that this is only set reliably for keyboard events.
//
//		@group	keyboardEvents
//		@return			(KeyName)		Key Name
//      @visibility external
//<
//		@param	[event]	(SC Event)  Event to return keyName for
//                                  Default is to use isc.EventHandler.lastEvent.
getKey : function (event) {
    return (event || this.lastEvent).keyName || null;
},

// Add getKeyName() as a synonym of getKey() since we refer to the property as event.keyName
getKeyName : function (event) {
    return this.getKey(event);
},

//>	@classMethod	isc.EventHandler.shiftKeyDown()
//			Return true if the shift key is being held down.
//			Note that this is only set reliably for keyboard events.
//
//		@group	keyboardEvents
//		@return			(Boolean)	true == shift key is down	
//      @visibility external
//<
//		@param	[event]	(ISC Event) Event from a call to getEventProperties().  
//                                  Default is to use isc.EventHandler.lastEvent.
shiftKeyDown : function (event) {
	return !!((event || this.lastEvent).shiftKey);
},

//>	@classMethod	isc.EventHandler.ctrlKeyDown()
//			Return true if the control key is being held down.
//			Note that this is only set reliably for keyboard events.
//
//		@group	keyboardEvents
//		@return			(Boolean)	true == control key is down	
//      @visibility external
//<
//		@param	[event]	(ISC Event) Event from a call to getEventProperties().  
//                                  Default is to use isc.EventHandler.lastEvent.
ctrlKeyDown : function (event) {
	return !!((event || this.lastEvent).ctrlKey);
},

//>	@classMethod	isc.EventHandler.altKeyDown()
//			Return true if the alt (option) key is being held down.
//			Note that this is only set reliably for keyboard events.
//
//		@group	keyboardEvents
//		@return			(Boolean)	true == alt key is down
//      @visibility external
//<
//		@param	[event]	(ISC Event) Event from a call to getEventProperties().  
//                                  Default is to use isc.EventHandler.lastEvent
altKeyDown : function (event) {
	return !!((event || this.lastEvent).altKey);
},


//>	@classMethod	isc.EventHandler.metaKeyDown()
//			Return true if the meta (windows or apple) key is being held down.
//			Note that this is not supported in all versions of IE.
//			Note that this is only set reliably for keyboard events.
//
//		@group	keyboardEvents
//		@return			(Boolean)	true == meta key is being held down	
//  @visibility internal
//<
//		@param	[event]	(SC Event) Event from a call to getEventProperties().  
//                                 Default is to use isc.EventHandler.lastEvent.

metaKeyDown : function (event) {
	return !!((event || this.lastEvent).metaKey);
},

//>	@classMethod	isc.EventHandler.modifierKeyDown()
//			Return true if the control key (windows) or command/apple key (apple) 
//          is being held down.
//			Note that this is not supported in all versions of IE.
//			Note that this is only set reliably for keyboard events.
//
//		@group	keyboardEvents
//		@return			(boolean)	true == control/command key is being held down
//  @visibility internal
//<
//		@param	[event]	(SC Event) Event from a call to getEventProperties().  
//                                 Default is to use isc.EventHandler.lastEvent.

modifierKeyDown : function (event) {
    if (isc.Browser.isMac) return !!((event || this.lastEvent).metaKey);
    else                   return !!((event || this.lastEvent).ctrlKey);
},

//>	@classMethod	isc.EventHandler.getMouseEventProperties()
//		Record the characteristics of a mouse event in the object passed in.
//
//		Sets the following properties:
//			eventType		type of the event
//			nativeTarget	DOM element that was the target of the event
//			target			Canvas that was the target of the event (may be null)
//			x 				page-level X coordinate
//			y				page-level Y coordinate
//			screenX			X coordinate relative to the top corner of the screen.
//			screenY			Y coordinate relative to the top corner of the screen.
//			buttonNum 		Mouse button pressed.  <code>null</code> == mouse button not pressed.
//
//		Note: we don't try to make element-relative coordinates (offsetX/Y) available, since
//            the HTML element that catches the event may not be the HTML element that
//            represents the Canvas that will handle the event.  For example, the DOM-level
//            target could be a table cell, ultimately contained within a DIV which represents
//            a Canvas.
//
//            Use
//					canvas.getOffsetX(), canvas.getOffsetY()
//            to get the coordinates of the event relative to the Canvas which is regarded as
//            the receiver of the event within ISC.
//
//		@group	events
//		@param	e		(DOM event) DOM event object (as passed by isc.EventHandler)
//      @visibility internal
//<
getMouseEventProperties : (isc.Browser.isIE ?
    function (e) {    
        var scEvent = this.lastEvent;
    if (!e) e = this.getWindow().event;
   
        scEvent.DOMevent = e;        
   
        scEvent.eventType = this._nativeMouseEventMap[e.type];

        scEvent.y = parseInt(e.clientY) + this.ns.Page.getScrollTop();
        scEvent.x = parseInt(e.clientX);

        if (!isc.Page.isRTL()) {
            scEvent.x += this.ns.Page.getScrollLeft();
        } else {
            


            
            if (isc.Browser.isIE && isc.Browser.version <= 7 && isc.Browser.isStrict &&
                isc.Page.getBodyOverflow() != isc.Canvas.HIDDEN)
            {
                if (!this._pageScrollbarThickness) {
                    
                    if (isc.Browser.version <= 6) {
                        this._pageScrollbarThickness = document.documentElement.offsetWidth - document.documentElement.clientWidth;

                    } else if (isc.Browser.version <= 7) {
                        this._pageScrollbarThickness = document.documentElement.offsetWidth - document.body.offsetWidth;

                    } else {
                        this._pageScrollbarThickness = document.body.offsetWidth - document.body.clientWidth;
                    }
                }
                scEvent.x -= this._pageScrollbarThickness;
            }
        }

        scEvent.nativeTarget = e.srcElement;

        //this.logWarn(this.echoDOM(scEvent.nativeTarget));
        
        // Hang onto the wheelDelta - only defined for mouseWheel events
        
        var delta = e.wheelDelta;
        if (delta != null) {
            scEvent.wheelDelta = - delta/120;
            scEvent.wheelDeltaY = scEvent.wheelDelta;
            scEvent.wheelDeltaX = 0;
        } else {
            scEvent.wheelDelta = null;
            scEvent.wheelDeltaX = null;
            scEvent.wheelDeltaY = null;
        }
        
        scEvent.screenX = e.screenX;
        scEvent.screenY = e.screenY;
        
        if (isc.Browser.isIE9) {
            // For a 'pointerup' or 'mouseup' event, `buttons' is 0 because no mouse button is being pressed.
            if (scEvent.eventType === isc.EH.POINTER_UP ||
                scEvent.eventType === isc.EH.MOUSE_UP)
            {
                if (e.button == 0) scEvent.buttonNum = 1;
                else if (e.button == 1) scEvent.buttonNum = 4;
                else if (e.button == 2) scEvent.buttonNum = 2;
                else scEvent.buttonNum = 0;

            } else {
                scEvent.buttonNum = e.buttons;
            }

        } else {
            scEvent.buttonNum = e.button;
        }

        // getKeyEventProperties (fired when a key goes down) should handle updating shiftKey
        // et al 
        // However if a native alert was fired in response to a key down event we don't get
        // the native keyUp, so will never clear these properties out. Avoid this by resetting
        // these properties on mouse events as well as key events.
        scEvent.shiftKey = (e.shiftKey == true);
        scEvent.ctrlKey = (e.ctrlKey == true);
        scEvent.altKey =  (e.altKey == true);
        scEvent.metaKey =  (e.metaKey == true);
        
        scEvent.target = this.getEventTargetCanvas(e, scEvent.nativeTarget, scEvent);

        /*
        this.logWarn("event: " + this.echo({
            type : e.type,
            button : e.button,
            target : e.srcElement,
            clientX : e.clientX,
            clientY : e.clientY,
            screenX : e.screenX,
            screenY : e.screenY
        }));
        */
        
        return scEvent;
    }
:   // isc.Browser.isDOM 
    function (e) {

        var scEvent = this.lastEvent;
        scEvent.DOMevent = e;
        scEvent.eventType = this._nativeMouseEventMap[e.type];

        var ignoreCoordinates = false;
        
        if (isc.Browser.isMobileWebkit) { 

            //>Touch
            if (isc.startsWith(scEvent.eventType, "touch")) {
                // e.touches is an array of event objects for each finger touching the screen.
                // Report the first finger's coordinates on the event object as a whole.
                if (scEvent.eventType == isc.EH.TOUCH_END) {
                    // "touchend" natively reports all coordinates as undefined or bogus (0) and
                    // has no e.touches Array.  This makes some sense since two or more fingers
                    // could have been touching the screen and so there is no single end coordinate
                    // to report.  In terms of this logic and mouse event handlers seeing analogous
                    // behavior to mouseUp, it means we need to avoid overwriting coordinates 
                    // recorded from the last touchstart / touchmove.  Native behavior noted on
                    // iPhone OS 3.2.
                    ignoreCoordinates = true;
                } else if (e.touches != null && e.touches[0] != null) {
                    var touch = e.touches[0];
                    // relative to element viewport 
                    scEvent.clientX = touch.clientX;
                    scEvent.clientY = touch.clientY;
                    // relative to screen
                    scEvent.screenX = touch.screenX;
                    scEvent.screenY = touch.screenY;
                    // relative to page (content start)
                    scEvent.x = touch.pageX;
                    scEvent.y = touch.pageY;

                    
                    if (isc.Browser.isIPad && isc.Browser.isMobileSafari && isc.Browser.iOSVersion == 7 &&
                        isc.Page.getOrientation() === "landscape")
                    {
                        var documentBody = this.getDocumentBody(),
                            bodyBCR = documentBody.getBoundingClientRect();
                        var realScrollTop = Math.max(0, (-bodyBCR.top) << 0);
                        
                        scEvent.screenY += ((-documentBody.scrollTop + realScrollTop) * isc.Page._getPageZoom()) << 0;
                        scEvent.y += -documentBody.scrollTop + realScrollTop;
                    }
                }

                /*
                 this.logWarn("native event: " + this.echo({
                 clientX : e.clientX,
                 clientY : e.clientY,
                 pageX : e.pageX,
                 pageY : e.pageY,
                 screenX : e.screenX,
                 screenY : e.screenY,
                 touchesLength : e.touches.length
                 }));
                 */
            } else if (isc.Browser.isAndroid && e.type == isc.EH.CLICK) {
                // Install valid coordinates for a native click so that same event
                // can be forwarded on and work properly for synthetic mouseDown/mouseUp.
                // See IDocument under EH.handleNativeClick() for explanation.
                scEvent.screenX = e.screenX;
                scEvent.screenY = e.screenY;

                scEvent.x = parseInt(e.clientX) + isc.Page.getScrollLeft(true);
                scEvent.y = parseInt(e.clientY) + isc.Page.getScrollTop();
            }
            //<Touch

        } else {
            scEvent.screenX = e.screenX;
            scEvent.screenY = e.screenY;

            

            
            if (scEvent.eventType != this.MOUSE_WHEEL) {
                var adjustForPageScroll = true; 
                scEvent.x = parseInt(e.clientX) + (adjustForPageScroll ? isc.Page.getScrollLeft(true)
                                                                        : 0);
                scEvent.y = parseInt(e.clientY) + (adjustForPageScroll ? isc.Page.getScrollTop()
                                                                        : 0);
            }

        } // end else on MobileWebkit

        scEvent.nativeTarget = e.target;

        scEvent._stillWithin = null; // clear cached result of stillWithinMouseDownTarget

        scEvent.target = this.getEventTargetCanvas(e, scEvent.nativeTarget, scEvent);
        
        
        if (scEvent.eventType == this.MOUSE_WHEEL) {            
            // deltaX / deltaY are available 
            var deltaY = e.wheelDeltaY,
                deltaX = e.wheelDeltaX,
                wheelDelta = e.wheelDelta,
                delta = wheelDelta,
                
                detail = e.detail,
                axis = e.axis;

            // If deltaX / deltaY are available, use them!             
            if (deltaY != null || deltaX != null) {
                
                // this.logWarn("Reported wheelDeltaX/Y:" + [scEvent.wheelDeltaX,scEvent.wheelDeltaY]);
                scEvent.wheelDeltaX = deltaX == null ? 0 : - deltaX/120;
                scEvent.wheelDeltaY = deltaY == null ? 0 : - deltaY/120;
                // for backCompat
                scEvent.wheelDelta = scEvent.wheelDeltaY;
                
            } else {
                // No detail, no wheelDeltaX / Y, just use "wheelDelta"                
                if (detail == 0 || (detail == null && wheelDelta != null)) {
                
                    var delta = e.wheelDelta;
                    if (delta != null) {
                        // may be fractional - this is ok.
                        scEvent.wheelDelta = - delta/120;
                        scEvent.wheelDeltaY = scEvent.wheelDelta;
                        scEvent.wheelDeltaX = 0;
                    } else {
                        scEvent.wheelDelta = null;
                        scEvent.wheelDeltaX = null;
                        scEvent.wheelDeltaY = null;
                    }
                    
                // No helpful "deltaX"/"deltaY", but we have event.detail, so use it!
                } else {
                    if (isc.Canvas.useNativeWheelDelta && e.detail == e.SCROLL_PAGE_UP) {
                        scEvent.wheelDelta = -Math.floor(
                            scEvent.target.height/isc.Canvas.scrollWheelDelta);
                    } else if (isc.Canvas.useNativeWheelDelta && e.detail == e.SCROLL_PAGE_DOWN) {
                        scEvent.wheelDelta =  Math.floor(
                            scEvent.target.height/isc.Canvas.scrollWheelDelta);
                    } else {
                        var vertical = axis == null || axis == 2;
                        // delta is a fraction, so that wheelDelta==1 when e.detail=3, but
                        // wheelDelta=0.333 when e.detail==1. This matches the earlier behavior
                        // for 3-line scrolling.
                        var delta = e.detail/3;
                        if (!isc.isA.Number(delta)) delta = 0;
                        if (vertical) {
                            scEvent.wheelDelta = delta;
                            scEvent.wheelDeltaY = delta;
                            scEvent.wheelDeltaX = 0;
                        } else {
                            scEvent.wheelDelta = 0;
                            scEvent.wheelDeltaY = 0;
                            scEvent.wheelDeltaX = delta;
                        }
                    }
                }
            }
        
        } else {
            scEvent.wheelDelta = null;
            
            scEvent.wheelDeltaX = null;
            scEvent.wheelDeltaY = null;
        }

        
		if (scEvent.eventType == isc.EH.MOUSE_MOVE || scEvent.eventType == isc.EH.TOUCH_MOVE) {
			// clear the button if the mouse is not down
			if (!this._mouseIsDown) scEvent.buttonNum = 0;

        // otherwise, a mouseDown/Up event - there's a button down, so which is it?

        //>Touch
		} else if (isc.Browser.isTouch) {
            if (e.targetTouches && e.targetTouches.length > 1) {
                // treat two fingers on a single target as context click by default
                scEvent.buttonNum = 2;
            } else {
                scEvent.buttonNum = 1;
            }
    
        //<Touch
		} else {
            if (e.which == 2) {
                scEvent.buttonNum = 4;

            
            } else {
                scEvent.buttonNum = (e.which == 1 || (isc.Browser.isSafari && e.which == 65536)
                                     ? 1 : 2);
            }
		}
        //this.logWarn("event: " + e.type + " which: " + e.which + 
        //             " e.button: " + e.button + ", scEvent.buttonNum: " + scEvent.buttonNum);
        //scEvent.nativeWhich = e.which;

        
		scEvent.shiftKey = (e.shiftKey == true);
		scEvent.ctrlKey = (e.ctrlKey == true);
		scEvent.altKey = (e.altKey == true);
		scEvent.metaKey = (e.metaKey == true);
        /*
        this.logWarn("event: " + this.echo({
            type : e.type,
            button : scEvent.buttonNum,
            target : e.target,
            clientX : e.clientX,
            clientY : e.clientY,
            screenX : e.screenX,
            screenY : e.screenY
        }));
        */

		//this.logWarn("event: " + e.type + "\r\n" + this.echoEvent(e));
        return scEvent;
    }
),

//>	@classMethod	isc.EventHandler.getKeyEventProperties()
//		Record the characteristics of a keyboard event
//
//		Sets the following properties on isc.EventHandler.lastEvent:
//			nativeKeyTarget	DOM element that was the target of the event
//          keyTarget       Target Canvas for the key event - matches the item that currently
//                          has focus
//			keyName			Name of the key pressed. (available on keyDown, keyUp and keyPress)
//          characterValue  Numeric character value reported by the key event.  Only recorded
//                          for keypress events - may be null or zero for non-character keys.
//
//			shiftKey		Shift key is currently down.  
//			ctrlKey			Control key is currently down.
//			altKey			Alt key is currently down.  
//			metaKey 		Meta key is currently down. 
//								Note: meta-key seems to not work on most platforms
//          eventType       Type of the event (keyDown, keyPress, etc.)
//
//		@group	events
//		@param	e		(DOM event) DOM event object (as passed by isc.EventHandler)
//  @visibility internal
//<

getKeyEventProperties : function (e) {

    if (e == null) e = this.getWindow().event;
        
    var scEvent = this.lastEvent;
    
    
    scEvent.nativeKeyTarget = (e.target || e.srcElement);
    scEvent.keyTarget = this._focusCanvas;     
    if (isc.isA && isc.DynamicForm && isc.isA.DynamicForm(this._focusCanvas)) {
        var itemInfo = isc.DynamicForm._getItemInfoFromElement(scEvent.nativeKeyTarget, 
                                                               scEvent.keyTarget);        
        if (itemInfo && itemInfo.item) scEvent.keyTarget = itemInfo.item;
    }

    scEvent.eventType = this.getKeyEventType(e.type);    
    //this.logWarn("getKeyEventProperties() - eventType " + scEvent.eventType +
    //              ", native key event target: " + scEvent.nativeKeyTarget +
    //              ", ISC calculated target: " + scEvent.keyTarget);

    // for keypresses only, record the character code (may be null or zero - assume the
    // developer knows what he's doing with this code)
    if (scEvent.eventType == this.KEY_PRESS) {
        scEvent.characterValue = this._determineKeyEventCharacterValue(e);
    }
    
    var keyName = this.determineEventKeyName(e);
    if (keyName != null) {
        scEvent.keyName = keyName;
    
    } else if (scEvent.eventType != isc.EH.KEY_PRESS) delete scEvent.keyName;

    

    
    scEvent.nativeKeyCode = e.keyCode;

    
	scEvent.shiftKey = (e.shiftKey == true || (isc.Browser.isMoz && scEvent.shiftKey));
    scEvent.ctrlKey = (e.ctrlKey == true);
	scEvent.altKey = (e.altKey == true);
	scEvent.metaKey = (e.metaKey == true);
    
    //this.logWarn("getKeyEventProperties() - keyName " + scEvent.keyName +
    //              ", ctrlKey: " + scEvent.ctrlKey +
    //              ", shiftKey: " + scEvent.shiftKey +
    //              ", altKey: " + scEvent.altKey);

},



getKeyEventType : function (nativeType) {
    if (!nativeType) return;
    return this._nativeKeyEventMap[nativeType];
},



// Return the charset value for the event.
// Note: returns null if we can't get a value, or if the value is zero (meaningless)
_determineKeyEventCharacterValue : function (DOMevent) {
    
     if (isc.Browser.isIE) return (DOMevent.keyCode || null);
     if (isc.Browser.isMoz) {
        return (DOMevent.which || null);
     }
     return (DOMevent.which || DOMevent.keyCode || null);
},
_$f1:"f1",
_$help:"help",
determineEventKeyName : function(DOMevent) {
    if (DOMevent == null) return;
    var keyCode = DOMevent.keyCode,
        which = DOMevent.which,
        EH = isc.EH,
        type = EH.getKeyEventType(DOMevent.type),
        windowEvent = this.getWindow().event
    ;

    // In IE we get have an onhelp handler tripped by f1 keypress only
    if (DOMevent.type == this._$help) return this._$f1;

    //this.logWarn("determineEventKeyName(): key properties to determine event: " +
    //             "keyCode:" + keyCode + 
    //             ", which:" + which + ", type:" + type);

    
    if (isc.Browser.isIE) {
        
        if (type == EH.KEY_DOWN || type == EH.KEY_UP) {
            return EH._virtualKeyMap[keyCode];
        }
        
        
        if (type == EH.KEY_PRESS) {
            // If we have the keyDown key name, just make use of it        
            var keyDownKeyName = EH._keyDownKeyNames[EH._keyDownKeyNames.length-1];
            if (keyDownKeyName != null) return keyDownKeyName;

            var name = EH._charsetValueToKeyNameMap[keyCode];
            
            if (!name && windowEvent && windowEvent.ctrlKey) {
                name = isc.EH._getKeyNameFromCtrlCharValue(keyCode);
            }
            return name;

        }
        
    
    } else if (isc.Browser.isMoz) {
        
        if (type == EH.KEY_DOWN || type == EH.KEY_UP) {
            return EH._virtualKeyMap[keyCode];

        } else if (type == EH.KEY_PRESS) {
        
            if (which == 0 && keyCode != 0) return EH._virtualKeyMap[keyCode];

            // If we have the keyDown key name, just make use of it
            var keyDownKeyName = EH._keyDownKeyNames[EH._keyDownKeyNames.length-1];
            if (keyDownKeyName != null) return keyDownKeyName;        
            
            
            if (keyCode == 0) {
                return EH._charsetValueToKeyNameMap[which];

            
            } else {
                return EH._virtualKeyMap[which];
            }

        }

    
    } else if (isc.Browser.isSafari) {
        if (type == EH.KEY_DOWN || type == EH.KEY_UP) {
            return EH._virtualKeyMap[keyCode];
        }
        
        var code = (which != null ? which : keyCode);
        if (code != null && code != 0) {        
            
            if (windowEvent && windowEvent.ctrlKey) {
                var keyName = isc.EH._charsetValueToKeyNameMap[code];
                if (keyName == null) {
                    
                    if ((isc.Browser.isChrome && isc.Browser.version < 33) ||
                        (!isc.Browser.isChrome && isc.Browser.version < 6))
                    {
                        if (code == 10) keyName = "Enter";
                        else keyName = isc.EH._getKeyNameFromCtrlCharValue(code);
                    } else {
                        keyName = isc.EH._getKeyNameFromCtrlCharValue(code);
                    }
                }
                return keyName;
            }

            
            var keyName = isc.EH._charsetValueToKeyNameMap[code];
            
            if (keyName == null) keyName = isc.EH._safariSpecialKeyPressMap[code]

            return keyName;            
            
        // Note: we are aware of a bug where keypress events on arrow keys give a keyCode of zero
        // in Safari. Return null here without logging a warning (below) 
        // - we have logic in the calling code to pick up the key name from the key-down 
        // event instead, so this is both known and worked around.
        } else if (type == this.KEY_PRESS) {
            return null;
        }
        
        

    
    } else {

        var code = which;
        
        // If which is null or zero, use keyCode (if it's not null or zero)
        if (code == null || (code == 0 && keyCode)) code = keyCode
        
        if (code != null) return isc.EH._charsetValueToKeyNameMap[code];
    }

    // Should never get here
    isc.Log.logWarn("EventHandler.determineEventKeyName(): Unable to determine key for '" + 
                    DOMevent.type + "' event. Returning null");
    return null;

},


_getKeyNameFromCtrlCharValue : function (ctrlCharValue) {

    if (ctrlCharValue == 30) return "6";
    if (ctrlCharValue == 31) return "-";

    return String.fromCharCode(ctrlCharValue + 64);

},

// Called from handleKeyUp
clearKeyEventProperties : function (keyName) {
	var scEvent = this.lastEvent;
    delete scEvent.eventType;
	delete scEvent.nativeKeyTarget;
	delete scEvent.characterValue;
    delete scEvent.keyName;
	delete scEvent.shiftKey;
	delete scEvent.ctrlKey;
	delete scEvent.altKey;
	delete scEvent.metaKey;
	// We should already have cleared the keyDownKeyNames entry as part of handleKeyPress 
	// (whether fired from native onkeypress or synthetically) for the key in question - this 
	// is really just a sanity check.
    this._keyDownKeyNames.remove(keyName);
},


// Destroyed targets
// We hang onto pointers to canvii in various places. Ensure these get cleared up when a canvas is
// destroyed, so we don't leak memory
// (Note many of these would be cleared on subsequent events in any case)
canvasDestroyed : function (canvas) {
    
    // if any clickMasks are showing, remove canvas from all clickMask "unmasked" lists
    if (this.clickMaskUp()) isc.EH.maskTarget(canvas);
    
    // if canvas was registered to receive the resize event, clear the registration 
    
    if (canvas._resizeID) isc.Page.clearEvent(canvas._$resize, canvas._resizeID);
    
    
    if (this.mouseDownEvent && this.mouseDownEvent.target == canvas)
        this.mouseDownEvent.target = null;
    if (this.lastClickTarget == canvas) this.lastClickTarget = null;
    if (this.lastEvent.target == canvas) this.lastEvent.target = null;
    if (this.lastEvent.keyTarget == canvas) this.lastEvent.keyTarget = null;
    if (this._focusCanvas == canvas) this._focusCanvas = null;
    if (this._delayedFocusTarget == canvas) this._delayedFocusTarget = null;
},

// ClickMask
// ------------------------------------------------------------------------------------------------
//  Basic behavior:
//  - Suppress mouse events such as 'mouseOver' et. al on targets that are not marked as unmasked.
//    This is typically a visual indication to the user that the target is masked.
//  - Fire clickAction on mouseDown on masked target.
//  - mode:    
//      o If "soft", hide the click mask on mouseDown on masked target, and allow the mouseDown
//        event to proceed.  [Use case: dismissing a pop up menu by clicking outside it]
//        * The mouseDown must be allowed to proceed as we don't want the click to be mysteriously
//          dropped in use cases like this one
//      o If "softCancel", dismiss the clickMask on mouseDown (as with a soft mask), but also 
//        cancel the mouseDown event if it occurred over a SmartClient widget.
//        [Use case: we use this in modal editing of ListGrids where stopOnerrors is true.
//         We can't use a true "hard" mask in this case because we wouldn't be able to have
//         the edit form items be unmasked without unmasking the whole grid and all it's 
//         ancestors].
//      o If "hard" prevent the mouseDown from reaching the intended target. (Also leave the click
//        mask in place, so future mouseDown's will fire the click action again).
//        [Use case: clicking outside a modal dialog box].
//       Hard masks: 
//       o Prevent interaction with native HTML written into masked widgets
//       o Disallow focus on masked targets via
//          - tabbing - (we do this by capturing tab keypresses)
//          - accessKey (removed from widget handle)
//          - programmatic - just remember the (attempted) focus target and re-focus when the
//            mask gets hidden
//  
//  Features:
//  - Layering / Stacking of multiple clickMasks.
//      Each call to showClickMask() returns a unique ID for the clickMask.
//      If showClickMask() is called multiple times, we create multiple stacked clickMask objects.
//      A click on a masked target will fire the click action of the topmost clickMask, and 
//      depending on the 'mode' property of the clickMask, fire the click action on the masks
//      underneath.
//      Clickmasks are hidden using hideClickMask(), which, if passed an ID parameter will hide only
//      the specified mask.
//      This nesting behavior is made necessary by use cases like the following:
//      - Date picker widgets are modal and dismissable - they show an soft clickMask which
//        whill hide the date-picker if the user clicks outside it.
//        They contain 'year' and 'month' menus, which are also modal and dismissable.  
//        If the user clicks outside the date-picker while it is showing it's year menu, both the
//        menu and the picker should be dismissed.
//        If the user clicks on the date-picker but outside the year menu (while it is visible),
//        the year menu should be dismissed and the date picker should receive a click event.
//        Therefore we need intelligent nesting of soft CM's where the masks track their
//        'unmaskedTargets' and click actions independantly.
//      - Modal window widgets can contain any other widget.  If a modal widow is shown containing
//        a data-bound listViewer, when the listViewer performs a server-side fetch, a click mask
//        is shown for the modal window, and another one for the server side fetch.
//        When the server side fetch returns, we should hide only the click-mask shown by the fetch.
//        Therefore we also need intelligent stacking of hard CM's (and the ability to 
//        hide clickMasks shown from specific 'showClickMask()' calls)
//  - unmasked targets:
//      Targets can be marked as unmasked either when the clickMask is instantiated (as an optional
//      third parameter to showClickMask()) or via a call to canvas.unmask() (falls through to
//      EventHandler.addUnmaskedTargets()).
//      Deprecated: The Canvas 'bringToFront()' method automatically adds widgets to the 
//      unmaskedTargets list of the formost clickMask - deprecated as of build 5.5, but 
//      still works.  Developers are encouraged to use unmask() instead.
//      Note that when a widget is 'unmasked' wrt a particular clickMask, it is effectively 
//      unmasked wrt any click masks underneath that one as well.
//      o If a "hard" clickMask is showing, we only support it having top-level
//        unmasked targets -- we can't support an unmasked child of a masked parent for
//        "hard" masks. [We DO support this for soft masks].
//       - the only known, cross-browser way to truly intercept all events, including events 
//         that might be received by handlers directly written into native elements, is to 
//         place a physical element ("screenspan") over the whole screen
//       - anything that is to be unmasked therefore has to be ready to have it's top-most 
//         element change zIndex to get above the screenspan, and this is generally not ok to 
//         for eg some widget nested deeply in a series of Layouts, since this might effectively 
//         cause a full-screen Layout to come to the front, occluding things that had been 
//         placed over it
//       - hard-unmasking a non-top-level widget comes about *only* for modal inline editing with
//         waitForSave *and* stopOnErrors set, which is a corner case where it would be acceptable 
//         to place limitations or require special coding to make masking work
//       - alternatives include:
//         o individually masking everything else on the screen by generating elements to place
//           on top (too slow)
//         o creating a top-level mask composed of 4 pieces with a rectangular opening for the
//           unmasked, non-top-level widget: complicated, especially if multiple widgets 
//           non-top-level widgets can become unmasked together, and they may move
//      o We never support an unmasked parent with a masked child widget.
//      o We always mask and unmask all peers (and descendants of peers) of a widget with 
//        the widget. Use cases include scrollbars, edges, shadows.
//
// Future enhancements:
//  - Component level clickMasks:
//      In Windows and other multiple-window desktop systems, a "clickMask" only extends to the
//      current Window.  For example if you open a menu within a window, other windows still respond
//      normally to mouseOver et al. 
//      At some point ISC may need to implement per-widget clickMasks as well.
// ------------------------------------------------------------------------------------------------



//> @type ClickMaskMode
// Passed as a parameter to +link{Canvas.showClickMask} to determine the masks behavior
// when clicked.
// @value "hard"   When the mask receives a click, it will fire its click action, 
//                  and cancel the event, leaving the clickMask up.
HARD:"hard",
// @value "soft"   When the mask receives a click, it will fire its click action, 
//                  then dismiss the clickMask and allow the event to proceed to its target.
SOFT:"soft",
// @group clickMask
// @visibility external
//<

SOFT_CANCEL:"softCancel",


//>	@classMethod	EventHandler.showClickMask()	(A)
//
// The clickmask intercepts all mouse events for everything on the screen except a list of 
// "unmasked" targets.  
// It is used in 2 ways:<br>
//  - To allow things such as modal dialogs which prevent interactions with widgets outside 
//    themselves<br>
//  - To allow things such as menus which respond to clicks outside themselves (without preventing
//    the event).<br>
// When a mouseDown occurs anywhere on the screen outside of an unmasked target, the clickMask's 
// "clickAction" fires.  <br>
// If the mask is soft it will disappear at this time. The event will be cancelled in this case
// unless mode is explicitly set to "softCancel" in which case we return false to kill the event.
// If the mask is hard, the event will be cancelled.<br>
// <br>
// This method returns an identifier for this clickMask.  If showClickMask() is called while a
// clickMask is already up, the clickmasks will 'layer', with the most recently shown clickMask 
// recieving click events first, and if  the mask is soft, passing the click event down to the
// previously shown mask.
// The clickMask can be hidden with a call to EventHandler.hideClickMask(), which takes an optional
// clickMaskID parameter. (If this parameter is not passed, all clickMasks will be hidden).
//
// @group   clickMask
// @param   clickAction     (string | method)   action to fire when the clickMask is clicked
// @param   mode    (ClickMaskMode)       
//      Should this mask be dismissed and allow events to proceed on outside click.
//      If passed <code>null</code> the mask will be drawn in <code>"hard"</code> mode.
// @param   unmaskedTargets (widget | Array of widgets)
//      Widget(s) to not be occluded by the clickMask. Note that if <code>mode</code> is 
//      <code>"hard"</code> only top level canvases (with no 
//      +link{Canvas.getParentCanvas()}) can be unmasked. If a canvas with a parentCanvas is passed
//      in, all its ancestors will also be unmasked.<br>
//      Also note that when a widget is unmasked, all its children are also unmasked (for both 
//      <code>"soft"</code> and <code>"hard"</code> masks)
//      
// @return  (string)    Unique identifier for this clickMask.
// @see method:Canvas.showClickMask
//
// @visibility eventhandler
//<
_maskCount : 0,
clickMaskRegistry : [],
showClickMask : function (clickAction, mode, unmaskedTargets, maskID) {
    // Set this flag to indicate showClickMask is running, even though
    // clickMaskUp won't yet return true
    
    this._showingClickMask = true;

    var autoHide;
    //>!BackCompat 2006.08.31 We used to take 'autoHide' rather than 'mode' as a parameter
    // for whether a clickMask should be hard or soft. 
    // If passed a boolean, just treat 'true' as soft, 'false' as hard.
    if (mode == true) {
        autoHide = true;
        mode = isc.EH.SOFT;
    } else if (mode == false || mode == null) {
        autoHide = false;
        mode = isc.EH.HARD;
    } else {
    //<!BackCompat
        // If mode is "soft" or "softCancel", autoHide is true
        autoHide = (mode != isc.EH.HARD);
    //>!BackCompat 2006.08.31
    }   //<!BackCompat

    if (unmaskedTargets == null) unmaskedTargets = [];
    else if (!isc.isAn.Array(unmaskedTargets)) unmaskedTargets = [unmaskedTargets]

    var EH = this,
        registry = EH.clickMaskRegistry,
        focusCanvas = EH.getFocusCanvas();
    if (this.logIsInfoEnabled("clickMask")) {
        this.logInfo("showing click mask, action: " + clickAction +
                 (autoHide ? ", autoHide true " : ", autoHide false ") + 
                 (maskID ? ", ID: " + maskID : "") +
                 ", focusCanvas: " + focusCanvas,
                 "clickMask");
    }

    // send mouse out the to the last mouse over target, so it doesn't get stuck in the "Over"
    // state while the clickMask is up, suppressing mouseMove/Over/Out
    // (Do this before the mask is up, otherwise this event won't be passed through to the 
    // last target!)
    var lastMoveTarget = EH.lastMoveTarget;
    if (lastMoveTarget) {
        delete EH.lastMoveTarget;
        EH.handleEvent(lastMoveTarget, EH.MOUSE_OUT);
    }

    // create a entry for this mask and add it to the registry
    
    var mask = {
        autoHide : autoHide,
        mode:mode,
        ID : (maskID != null ? maskID : "cm_" + EH._maskCount++),
        _unmaskedTargets : {}
        //,stackTrace:this.getStackTrace()
    };

    // Add the unmasked children to the mask object
    
    this._applyUnmaskedTargets(unmaskedTargets, mask);
    // remember what mask was on top before this one was created.
    var topMask = registry.last();
            
    registry.add(mask);
    // clear the flag indicating showClickMask is running 
    // [since "clickMaskUp" will now return true]
    delete this._showingClickMask;

    
    // the click action will fire on mouseDown outside of the unmasked targets
	mask.clickAction = clickAction;
	
    // blur the Canvas that currently has focus and remember which one it was, for possible
    // restoration of focus on clickMask hide
    if (focusCanvas != null && !unmaskedTargets.contains(focusCanvas) &&
        !focusCanvas._ignoreClickMaskFocus) 
    {
        focusCanvas.blur("showing clickMask");
        this.setMaskedFocusCanvas(focusCanvas, mask);
    } else if (topMask != null) {
        this.setMaskedFocusCanvas(topMask._maskedFocusCanvas, mask);
    }
    var isHardMask = this.isHardMask(mask);
    
    // If this is a hard mask, we need to 
    // - pull all masked widgets out of the page level tab order
    // - If we're already showing a screenSpan, push masked top level elements behind it

    if (isHardMask) {
    
        var startTime = isc.timeStamp();
    
        // The canvii which will be hard-masked by this mask are basically all the canvii
        // down to the next visible hard clickMask.
        // If this is the only clickMask showing, or all the other masks are soft, this is
        // just all the canvii on the page other than our unmasked targets.
        
        var entireCanvasList;
        if (registry.length > 1) {
            var hasHardMaskBelow = false,
                otherMasks = [];
            // our position is registry.length-1, so start at registry.length -2
            for (var i = registry.length-2; i >=0; i--) {
                otherMasks.add(registry[i]);
                
                if (this.isHardMask(registry[i])) {
                    hasHardMaskBelow = true;
                    break;
                }
            }
            
            if (hasHardMaskBelow) {
                // the 'otherMasks' will list any masks below this one up to and including the
                // first hard mask - so their unmasked targets all need to get masked.
                for (var i = 0; i < otherMasks.length; i++) {
                    var newlyMasked = otherMasks[i]._unmaskedTargets;
                    if (newlyMasked) {
                        // pass in the flag to indicate that we're passing in an object
                        // rather than an array
                        // Also pass in the flag to indicate this is being called as part of showClickMask
                        this._hardMaskTargets(newlyMasked, unmaskedTargets, true, true);
                    }
                }
            // If no hard mask below, hard mask everything except our unmaskedTargets
            } else {
                entireCanvasList = true;
                this._hardMaskTargets(isc.Canvas._canvasList, unmaskedTargets, false, true);
            }
            
        // If no other mask showing, hard mask everything except our unmaskedTargets
        } else {
            entireCanvasList = true;
            this._hardMaskTargets(isc.Canvas._canvasList, unmaskedTargets, false, true);
        }
        
    }
    
    // If this is the first mask being shown, show the screenSpan if necessary
    
    if (this.maskNativeTargets) {

        if (topMask == null) {
            this.showScreenSpan(mask);

        // catch the case where the screenSpan is already showing and needs to be moved behind 
        // the top level unmasked target.
        } else if (isHardMask) {
            this._adjustSpanZIndex(mask._unmaskedTargets)
        }
    }

    // updateEventMasks()
    // Shows / Clears individual event masks over canvii if necessary
    this.updateEventMasks();
    
    
    return mask.ID;
},


// Canvas-level event masks and "soft" clickMasks:
// Some widgets contain HTML that will swallow mouse events
// (Flashlets / IFrames etc).
// If we are showing a hard mask ovr these widgets, they will now be covered by a screenSpan
// which will intercept the events before they get swallowed (ok).
// However if these widgets are "under" a soft mask, they would swallow clicks so we'd fail
// to dismiss the soft mask / fire the click mask action when the user clicked on the widget 
// in question.
// Handle this by showing widget level event masks for each registered maskable canvas
// that is covered by a soft mask (but not by a hard mask)
updateEventMasks : function () {
    var registry = this.clickMaskRegistry,
        topMask = registry ? registry[registry.length-1] : null;
    if (topMask && topMask.autoHide) {
        var softMaskedCanvii = {};
        isc.addProperties(softMaskedCanvii, topMask._unmaskedTargets);
        
        this.showEventMasks(false, softMaskedCanvii);
        
    // top mask is hard ==> no need for separate widget-level event masks
    // no masks are showing ==> clear any widget-level event masks
    } else {
        this.hideEventMasks();
    }
},



// Helper method to apply unmasked targets to a mask.
// Will not actually modify the widgets' handle.

_applyUnmaskedTargets : function (unmaskedTargets, mask) {
    
    // call the method to combine ancestors, descendants and peers of the targets into
    // the list.
    unmaskedTargets = this._getFullSetOfTargetsToUnmask(unmaskedTargets, mask);

    for (var i = 0; i < unmaskedTargets.length; i++) {
        var target = unmaskedTargets[i];
        if (target == null) continue;
        mask._unmaskedTargets[target.getID()] = target;
    }
},


// When we unmask canvases wrt a clickMask, we must also unmask:
// - for hard masks, all ancestors of the canvii
// - all peers of the canvii
// - all descendants of the canvii
// Call this method to add these additional canvii into the list to be unmasked
// Directly effects the list passed in (and returns the modified list)
_getFullSetOfTargetsToUnmask : function (unmaskedTargets, mask) {

    
    if (!unmaskedTargets || unmaskedTargets.length == 0 || !mask) return unmaskedTargets;
    
    // If we're passed any IDs, convert to pointers to the widget
    for (var i = 0; i < unmaskedTargets.length; i++) 
        unmaskedTargets[i] = this._getCanvas(unmaskedTargets[i]);

    // If we are creating a hard mask, ensure that we include all ancestors of any unmaskedTargets
    // passed in.
    var alreadyUnmasked = mask._unmaskedTargets;
    if (!mask.autoHide && unmaskedTargets.length > 0) {
        var length = unmaskedTargets.length;
        for (var i = 0; i < length; i++) {
            var target = unmaskedTargets[i];
            if (target.topElement && !alreadyUnmasked[target.topElement.getID()] && 
                                     !unmaskedTargets.contains(target.topElement)) 
            {      
                this.logWarn(
                    "Attempting to unmask target canvas:" +
                     target.getID() + " with respect to a hard click mask. " +
                     "This is not a top level Canvas - all ancestors of "+
                     "this Canvas will also be unmasked.", "clickMask"
                );
                unmaskedTargets.add(target.topElement);
            }
        }
    }

    // also recursively mask any peers of the targets.
    // Use cases: scrollbars, shadows, edge-canvii, etc.
    // - Note this is only necessary for the highest level targets being masked, since
    //   peers are at the same level in widget hierachy, so get masked (along with other 
    //   descendants) when the higher level parent is masked
    this._combineTopPeersIntoList(unmaskedTargets);
    
    // this method will modify the unmaskedTargets to include all descendants recursively.
    this._combineDescendantsIntoList(unmaskedTargets);
    
    return unmaskedTargets;
},


// Helper methods for determining targets to mask/unmask - takes a list of widgets and 
// recursively adds children of each widget to the list
_combineDescendantsIntoList : function (list) {
    var originalLength = list.length;
    for (var i = 0; i < originalLength; i++) {
        if (list[i] == null) continue;
        this._addDescendantsToList(list[i], list);
    }
},

// - Called directly from maskTargets(), addPeersToList, and _combineDescendantsIntoList()
_addDescendantsToList : function (widget, list, recursive) {
    
    // On the first (non-recursive) call we know that the widget is already in the list.
    if (recursive && !list.contains(widget)) list.add(widget);
    if (widget.children) {
        for (var i = 0; i < widget.children.length; i++) {
            this._addDescendantsToList(widget.children[i], list, true);
        }
    }
    
    // CanvasItems and containerWidgets
    // DynamicForm items can be rendered into a masked containerWidget, but the form itself be 
    // unmasked (we do this for ListGrid editing where the editorForm is unmaksed, but the
    // Listgrid body is masked so a click outside an edit item dismisses the editor).
    // Currently if the form contains any CanvasItems the canvasItems will NOT be unmasked in
    // this case since their parent is masked.
    // We need to handle this case if we want to support modalEditing and CanvasItems.
    // In order to handle this:
    // - when adding unmasked targets, if a DF is an unmasked target we ensure any CanvasItems'
    //   canvii are also unmasked even if they're contained in a different containerWidget
    // - in CanvasItem, when adding the canvas to the containerWidget as a child we explicitly check
    //   for the DF being unmasked and unmask explicitly if necessary.
    if (isc.DynamicForm && isc.CanvasItem && isc.isA.DynamicForm(widget)) {
        var items = widget.getItems() || [];
        for (var i = 0; i < items.length; i++) {
            if (items[i].containerWidget == widget) continue;
            if (isc.isA.CanvasItem(items[i]) && isc.isA.Canvas(items[i].canvas)) {
                this._addDescendantsToList(items[i].canvas, list, true);
            }
        } 
    }
    
},

// Helper methods for determining targets to mask/unmask - takes a list of widgets and 
// recursively adds peers (and descendents thereof) of the highest level widgets to the list
_combineTopPeersIntoList : function (list) {
    for (var i = 0, length = list.length; i < length; i++) {
        var t = list[i];
        if (t.parentElement && list.contains(t.parentElement)) continue;
        this._addPeersToList(list[i], list);
    }
},

// - Called directly from maskTargets() and _combineTopPeersIntoList()
_addPeersToList : function (widget, list, recursive) {
    if (recursive && !list.contains(widget)) list.add(widget);
    var peers = widget.peers;
    if (peers) {
        for (var i = 0; i < peers.length; i++) {
            this._addPeersToList(peers[i], list, true);
        }
    }
    
    // We also want to pick up descendants of peers.
    // (example might be a button with a floating label title)
    this._addDescendantsToList(widget, list);
},


// Given the ID of a click mask return a pointer to the mask object itself

_$ID:'ID',
getClickMask : function (ID) {
    var registry = this.clickMaskRegistry;
    if (isc.isAn.Object(ID)) {
        return registry.contains(ID) ? ID : null;
    }
    return registry.find(this._$ID, ID);
},

changeClickMaskID : function (oldID, newID) {
    var mask = this.getClickMask(oldID);
    if (mask) mask.ID = newID;
},

// is a specific click mask "hard" (IE should suppress events from passing through it) or "soft"
// (Should respond to clicks but not mask events).

isHardMask : function (mask) {
    if (!isc.isAn.Object(mask)) mask = this.getClickMask(mask);
    return mask == null ? false : (mask.mode == isc.EH.HARD);
},

getTopHardMask : function () {
    var registry = this.clickMaskRegistry;
    for (var i = registry.length -1; i >= 0; i--) {
        if (this.isHardMask(registry[i])) return registry[i];
    }
    return null;
},

// Given an array of widgets, ensure they are "hard masked".
// This means they are obscured by the screenSpan 
// [If we're in the process of showing a clickMask, this is handled by the calling method]
// Their accessKey is cleared, if necessary.
// no update to tabIndex is necessary
_hardMaskTargets : function (widgets, unmaskedTargets, targetsAsObject, fromShowClickMask) {
    if (!widgets) return;
    
    //this.logWarn("masking widgets: " + widgets + 
    //             ", unmaskedTargets is: " + this.echo(unmaskedTargets));

    // Allows us to pass in an 'unmaskedTargets' object on a mask which is a map like this:
    // {canvasName:true, canvasName:true, ...}
    if (targetsAsObject) {
        for (var canvasName in widgets) {
            var canvas = widgets[canvasName];
            this._hardMaskTarget(canvas, unmaskedTargets, fromShowClickMask);
        }
    } else {
        for (var i = 0; i < widgets.length; i++) {
            var canvas = this._getCanvas(widgets[i]);
            this._hardMaskTarget(canvas, unmaskedTargets, fromShowClickMask);
        }
    }

},

// Actually hard mask a target
_hardMaskTarget : function (canvas, unmaskedTargets, fromShowClickMask) {

    // handle the case where some member of the canvas list is not a valid canvas
    
    if (!isc.isA.Canvas(canvas) || canvas.destroyed) {
        isc.Log.logWarn(
            "showClickMask - attempting to remove invalid object :" +
             isc.Log.echo(canvas) +
            " from tab order",
            "clickMask"
        );
        return;
    }

    
    // Don't actually mask anything that's explicitly unmasked
    if (unmaskedTargets && unmaskedTargets[canvas.getID()]) return;


    
    if (canvas.isDrawn()) {
            
        // we just need to ensure that the top-parent of the masked canvii is behind the span
        // Note: we are guaranteed to have the top-parent in the unmasked canvii already, so skip
        // any non top level widgets
        if (canvas.getParentCanvas() == null) {
            // Widgets to show behind the screenspan - 2 possibilities:
            // - the mask is in the process of being shown:
            //  o If this is the only mask up, we haven't yet created the screenSpan, but when 
            //    we do we'll position it over all top level masked widgets 
            //  o If the span is already showing due to another mask below us, we'll adjust the
            //    zIndex at the end of the showClickMask method
            //  [Therefore no action to take in this case]
            // - this mask is already showing and this method was called from maskTarget(), so 
            //   we need to sink this widget explicitly behind the screenSpan.
            if (!fromShowClickMask && this._screenSpan && this._screenSpan.isDrawn() && 
                canvas.getZIndex() >= this._screenSpan.getZIndex()) 
            {
                //>DEBUG
                this.logDebug("lowering zIndex of: " + canvas, "clickMask");
                //<DEBUG

                
                canvas.setZIndex(isc.EH._screenSpan.getZIndex() -1);
            }

            
        }
    }
    
    // clear the accessKey from the canvas - note that we don't have to clear the
    // tabIndex as we explicitly manage tab-keypresses while the mask is up
    if (canvas.accessKey != null && canvas.isDrawn()) {
        canvas._setHandleAccessKey(null);
    }
},

    
//>	@classMethod	EventHandler.hideClickMask()	(A)
//  Hide the click mask.
// @param [ID]  (string)
//      Which clickMask to hide?  If not specified, hide all clickMasks.
// @group clickMask
// @see EventHandler.showClickMask()
// @see method:canvas.hideClickMask
// @visibility eventhandler
//<
hideClickMask : function (ID) {

    

    if (this.logIsInfoEnabled("clickMask")) 
        this.logInfo("hideClickMask called with ID: " + ID, "clickMask");
    
    var registry = this.clickMaskRegistry;
    // Ensure we have at least one CM showing
    if (registry.length == 0) return;

    // if there's no ID, just hide all clickmasks
    if (ID == null) {
    
        // Hide the first CM in the array
        this.hideClickMask(registry[0].ID)

        // call this method with no ID again (will hide the next item in the array, and so on)
        if (registry.length > 0) {
            this.hideClickMask();
        } else {
            this.logInfo("all clickmasks hidden", "clickMask");
        }
        return;
    }

    var mask = this.getClickMask(ID);

    // if we were passed a bad ID just return (the CM in question's probably already hidden!)
    if (mask == null) return;

    //this.logWarn("hiding mask that had unmasked targets: " + this.echo(mask._unmaskedTargets));

    // At this point we're working with a specific mask in the registry.

    // Get all the information we need from the clickMask being destroyed, and remove it from
    // the clickMaskRegistry        
    var index = registry.indexOf(mask),
        isTopMask = (index == (registry.length -1)),
        isHardMask = this.isHardMask(mask),
        nextMaskDown = (index > 0 ? registry[index -1] : null),
        isTopHardMask,
        nextHardMaskDown;
     
    if (this.logIsInfoEnabled("clickMask")) {
        var msg = "hiding clickMask ID: " + ID;
        if (isHardMask) msg += "[autoHide:false]";
        else msg += "[autoHide:true]";
        if (registry.length < 2) {
            msg += ", all masks hidden";
        } else {
            // report index
            msg += " with index: " + index + " of " + (registry.length - 1); 
        }
        this.logInfo(msg, "clickMask");
    } 
        
    // If this is a 'hard' clickMask with no hard mask on top of it, 
    // hard unmask any unmasked newly targets
    if (isHardMask) {
        nextHardMaskDown = this._getNextHardMask(index, false);
        var nextHardMaskUp = this._getNextHardMask(index, true);
        isTopHardMask = (nextHardMaskUp == null);
    }
    
    var focusCanvas = mask._maskedFocusCanvas,
        unmaskedTargets = mask._unmaskedTargets;
    // Actually remove the clickMask from the registry at this point
    
    registry.remove(mask);
              
    // At this point
    // - if we hid the topmost mask we need to restore focus to the previous focus widget
    // - if the mask we hid had another mask under it, we need to notify that mask of this
    //   mask's unmaskedTargets
    // - if we hid the only visible mask we need to hide the screenSpan
    // - if we hid a hard mask
    //    - if there's a hard mask below it, the screenspan should go behind that mask's
    //      unmaskedTargets
    //    - otherwise we need to shift the screenSpan to the back of the visible set of widgets.
    
    // If we have a 'nextMaskDown', update it with the focus canvas, etc.
    if (nextMaskDown != null) {
        
        if (unmaskedTargets != null) {
            if (nextMaskDown._unmaskedTargets == null) nextMaskDown._unmaskedTargets = {};
            isc.addProperties(nextMaskDown._unmaskedTargets, unmaskedTargets);
        }

        // We attempt to focus on the maskedFocusCanvas below... but if it's still masked
        // we can't.
        // Instead record the maskedFocusCanvas on the next mask down
        if (focusCanvas && !nextMaskDown._unmaskedTargets[focusCanvas.getID()]) {
            this.setMaskedFocusCanvas(focusCanvas, nextMaskDown);
        }
    }
    
    if (this._screenSpan) {
        // if this is the only mask showing, hide the screenspan
        // True whether soft or hard
        if (isTopMask && nextMaskDown == null) {   
            
            if (isc.Browser.isIE) {
                isc.Timer.setTimeout({target:this._screenSpan, methodName:"hide"}, 0);
            } else {
                this._screenSpan.hide();                
            }   
        
        // If we're hiding the top-most hard mask we need to reposition the screenspan
        } else if (isTopHardMask) {      
            if (nextHardMaskDown) {
                // slot the screenspan behind all unmasked targets down to the next hard-mask
                // (May be soft masks over that hard mask - have to put the screenspan behind those
                // unmasked targets)
                var unmaskedTargets = isc.addProperties({}, nextHardMaskDown._unmaskedTargets);
                var currentMaskIndex = registry.length-1,
                    currentMask = registry[currentMaskIndex];
                while (currentMask != nextHardMaskDown) {
                    isc.addProperties(unmaskedTargets, currentMask._unmaskedTargets);
                    currentMaskIndex--;
                    currentMask = registry[currentMaskIndex];
                }
                this._adjustSpanZIndex(unmaskedTargets);
            } else this._screenSpan.sendToBack();
        }
        
        // If this was a hard mask we need to ensure that all newly revealed targets
        // ("unmaskedTargets" of the mask below if there was one, otherwise all canvii)
        // have their accessKeys cleared
        
        if (isHardMask) {

            var unmasked;
            if (nextHardMaskDown != null) {
                unmasked = [];
                // iterate through each of the masks below us up to (and including) the 
                // hard mask below us, to determine which widgets will be no longer be 
                // hard-masked when this mask is hidden.
                for (var i = index-1; i >= 0; i--) {
                    var lowerMask = registry[i];
                    unmasked.addList(isc.getKeys(lowerMask._unmaskedTargets));
                    if (lowerMask == nextHardMaskDown) break;
                }
            } else {
                // everything is unmasked
                
                unmasked = isc.Canvas._canvasList;
            }

            // Call _hardUnmaskTargets to restore accessKeys.
            this._hardUnmaskTargets(unmasked, true);
        }
         
        // If we have a masked focus canvas, focus on it if it's unmasked
        if (focusCanvas != null && !focusCanvas.destroyed && !this.targetIsMasked(focusCanvas)
            && !focusCanvas._keyboardEventsDisabled) 
        {
            if (this.logIsInfoEnabled("clickMask")) {
                this.logInfo("focusing in " + focusCanvas + " on clickMask hide " +
                             "with current focusCanvas: " + isc.EH._focusCanvas, "clickMask");
            }

                        
            var delayedFocus = (isc.Browser.isIE && this.lastEvent.eventType == this.MOUSE_DOWN)
            
            if (delayedFocus) {     
                this._delayedFocusTarget = focusCanvas;
            } else {
                // We've seen an "Unexpeced call to method or property access with the
                // following stack in IE:
                // Canvas.setFocus(_1=>true) Canvas.focus()
                // EventHandler?.hideClickMask(_1=>"isc_globalPrompt") 
                // Canvas.hideClickMask(_1=>undef) Window.clear(_1=>undef, _2=>undef, _3=>undef, _4=>undef) [a]Dialog.clearMessage() anonymous()           
                // RPCManager.doClearPrompt(_1=>Obj) RPCManager.$528(_1=>23) 
                //
                // so encase in try/catch block
                try {
                    focusCanvas.focus();
                } catch (e) {}
            }
        }
    }

    // updateEventMasks()
    // Shows / Clears individual event masks over canvii if necessary
    this.updateEventMasks();
    
    // If we hid the bottom mask, but other masks are showing on top of it, we currently
    // do nothing.
    // This is appropriate with 'unmaskedTargets', since nothing will be masked below
    // this widget.
    // We passed the 'maskedFocusCanvas' from up to the masks above it when we showed them (when
    // appropriate), so it should not matter that we're dropping the masked focus canvas for the
    // bottom mask.
},

// Given a clickMask in the registry determine the index of the next hard mask above or below
// it.
_getNextHardMask : function (maskIndex, above) {
    
    var registry = this.clickMaskRegistry;
        
    if (above) {
        for (var i = maskIndex+1; i < registry.length; i++) {
            if (this.isHardMask(registry[i])) return registry[i];
        }
    } else {
        for (var i = maskIndex-1; i >=0; i--) {
            if (this.isHardMask(registry[i])) return registry[i];
        }
    }
    // No hard mask was found above (or below) this mask
    return null;
},

// Resolve a canvas ID (or pointer to a canvas) to a canvas.
_getCanvas : function (canvas) {
    if (isc.isA.String(canvas)) return window[canvas];
    return canvas;
},


// Ensure widgets are not "hard masked"
_hardUnmaskTargets : function (widgets, fromHideClickMask) {
    if (!widgets || widgets.length == 0) return;
    
    for (var i = 0; i < widgets.length; i++) {
        // We pass either an array of widgets or an array of widget IDs - so we need to resolve 
        // these to canvii    
        var canvas = this._getCanvas(widgets[i]);
        if (!canvas) continue;
        
        // If we cleared the accessKey, reset it now
        if (canvas.accessKey != null && canvas.isDrawn()) {
            canvas._setHandleAccessKey(canvas.accessKey);
        }

        
        if (!canvas.isDrawn() && isc.isA.DynamicForm && isc.isA.DynamicForm(canvas) && 
            canvas.items && canvas.items.length > 0)
        {
            var item = canvas.items[0];
            
            if (item.containerWidget != canvas) canvas = item.containerWidget;
        }

        // Ensure that the canvas isn't obscured by the screenSpan
        // If the top level targets are behind the screenSpan, move it above it.
        
        if (!fromHideClickMask && canvas.getParentCanvas() == null &&
            canvas.getZIndex() <= this._screenSpan.getZIndex() &&
            canvas != this._screenSpan) 
        {
            canvas.setZIndex(this._screenSpan.getZIndex() +1);
            //>DEBUG
            this.logDebug("raised above screenspan: " + canvas, "clickMask");
            //<DEBUG
        }
    }

},

//>	@classMethod	EventHandler.clickMaskUp()	(A)
//  Determine whether a clickMask is currently showing.
//
// @param [ID]  (string)
//      Which clickMask to check?  If not specified, check whether any clickMask is showing.
// @group clickMask
// @return (boolean)    true if the click mask is showing
// @visibility eventhandler
//<
clickMaskUp : function (ID) {
    var registry = this.clickMaskRegistry;
    
    if (ID == null) return (registry.length > 0);
    else return (registry.find("ID", ID) != null);
},


//>	@classMethod	EventHandler.getAllClickMaskIDs()	(A)
//  Get the IDs for every click mask that's currently up.
// @group clickMask
// @return (Array)  Array of clickmask ID strings.
// @visibility internal
//<
getAllClickMaskIDs : function () {
    var registry = this.clickMaskRegistry;
    if (registry.length < 1) return [];
    
    return registry.getProperty("ID");
},

//>	@classMethod	EventHandler.showScreenSpan()	(A)
// @visibility internal
//<
showScreenSpan : function (mask) {
    
	if (!this._screenSpan) {
        this._screenSpan = isc.ScreenSpan.create(
            {ID:"isc_EH_screenSpan", 
             // If the screenspan gets destroyed, have it clear up our pointer to it.
             pointersToThis:[{object:this, property:"_screenSpan"}]
            },
            this.clickMaskProperties
         );
    }
	var span = this._screenSpan;
	span.show();
    
    if (!this.isHardMask(mask)) {
        span.sendToBack();
    } else {
        this._adjustSpanZIndex(mask._unmaskedTargets);
    }
},

// We show the screenSpan for clickMasks to suppress native interactions with DOM element such
// as form elements / links
_adjustSpanZIndex : function (unmaskedTargets) {
    // set a flag so we don't respond to 'bringToFront()' calls on widgets by 'unmasking' them
    
    this._adjustSpanZIndexRunning = true;

    var zIndex;
    for (var ID in unmaskedTargets) {
        var canvas = this._getCanvas(ID);
        // We only need to move the top level unmasked targets above the screenSpan.
        
        
        if (!canvas || canvas.destroyed || canvas.getParentCanvas() != null) {
            continue;
        }
        
        // If the canvas is a peer of an unmasked master, assume the masterElement manages
        // the zIndex of the peer, rather than calling bringToFront() here.
        // Avoids, for example, a shadow showing up in front of its target widget.
        
        if (canvas.getMasterCanvas() && unmaskedTargets[canvas.getMasterCanvas().getID()]) continue;
        
        canvas.bringToFront();
        if (zIndex == null) zIndex = canvas.getZIndex(true);
        
        // Remember zIndex is going to be the lowest zIndex of all unmasked canvii so we can 
        // slot the screenSpan underneath it.
        // We know that all peers unmask with their master (and allow the master to 
        // handle assigning the zIndex), so ensure the zIndex of the span is less than 
        // the zIndex of any peers.
        
        if (canvas.peers) {
            for (var i = 0; i < canvas.peers.length; i++) {
                if (!canvas.peers[i].isDrawn()) continue;
                zIndex = Math.min(zIndex, canvas.peers[i].getZIndex(true));
            }
        }
    }
    
    
    if (zIndex != null) this._screenSpan.setZIndex(zIndex -1);
    else this._screenSpan.bringToFront();

    this._adjustSpanZIndexRunning = false;
    
},

//> @classMethod    isc.EventHandler.maskTarget()
//
//      Ensure that a widget (or array of widgets) is below (obscured by) by the clickMask.
//
//      @group  clickMask
//      @param  target      (widget | Array of widgets)
//                  target[s] to unmask
//      @param  [maskID]    (string)
//                  ID of clickmask to move this target below.  If not passed in, will move below
//                  all visible clickMasks
//  @visibility eventhandler
//<

maskTarget : function (target, maskID) {
    // synonym for maskTargets
    return this.maskTargets(target, maskID);
},

//> @classMethod    isc.EventHandler.maskTargets()
//
//      Synonym for +link{classMethod:EventHandler.maskTarget()}
//
//      @group  clickMask
//      @param  target      (widget | Array of widgets)
//                  target[s] to unmask
//      @param  [maskID]    (string)
//                  ID of clickmask to move this target below.  If not passed in, will move below
//                  all visible clickMasks
// @visibility eventhandler
//<
maskTargets : function (targets, maskID, dontMaskChildren) {

    var registry = this.clickMaskRegistry;
    if (targets == null || registry.length == 0) return;

    if (!isc.isAn.Array(targets)) targets = [targets];
    else if (targets.length == 0) return;
    
    var mask =  (maskID == null ? registry[0] : 
                    (isc.isA.String(maskID) ? this.getClickMask(maskID) : maskID)
                );
    
    // If we couldn't get a mask, bail.
    if (mask == null) {
        // log at the info level -- this is likely to happen if the mask was hidden already, so 
        // a logWarn is a little strong
        this.logInfo("maskTargets called with invalid maskID - returning.", "event")
        return;
    }
    
    // At this point we have a valid mask and a set of targets to mask.
    
    // Iterate through targets adding any children or ancestors that need to also get masked
    var originalTargetsLength = targets.length    
    for (var i = 0; i < originalTargetsLength; i++) {
        
        var target = targets[i];
        
        // By default if this method is called we will mask all the widget's children as well as
        // the widget itself. This means if you call (for example) 'mask' on a currently unmasked
        // ListGrid, the body will also get masked.
        if (!dontMaskChildren && target.children != null) {
            this._addDescendantsToList(target, targets);
        }
    
        // We support having a parent be masked but a child be unmasked, but not a child be masked
        // but its parent be unmasked.
        // Therefore we will also iterate up through this widget's ancestor chain, masking all 
        // ancestors -- but not all of their children as this could mask just about everything on
        // the page if one of our targets is a child of a pageLayout, for example.
        // 
        // Also: Always mask / unmask peers with their masters
        // Use cases: Scrollbars, edged canvii, etc
        
        var parent = target.parentElement;
        while (parent != null) {
            if (!targets.contains(parent)) {
                targets.add(parent);
                if (dontMaskChildren) this._addPeersToList(parent, targets);
            }
            parent = parent.parentElement;
        }
        
        // At this point 'parent' is the top-level element, if defined
        if (dontMaskChildren || !parent) {
            this._addPeersToList(target, targets);
        }
        if (parent) this._addPeersToList(parent, targets);
    }
    
    // Now actually mask every target
    // When masking a widget we're essentially moving it down some number of layers in
    // the clickmask stack. (The simplest case of course is moving it from top to bottom).
    
    
    var maskIndex = registry.indexOf(mask);
    
    // Determine where the top hard mask is above / including this mask.
    // This will be used to determine whether the widget(s) being masked need to be hard masked
    var topHardMask;
    for (var i = maskIndex; i < registry.length; i++) {
        currentMask = registry[i];
        if (this.isHardMask(currentMask)) topHardMask = i;   
    }

    var targetsToHardMask;
    if (topHardMask != null) targetsToHardMask = [];
    for (var n = 0; n < targets.length; n++) {
        var target = targets[n];
        // always blur if it has focus.
        if (target.hasFocus && !target._ignoreClickMaskFocus) target.blur();
        
        var currentMask,
            topHardMask,
            targetLevel = null;
        
        for (var i = maskIndex; i < registry.length; i++) {
            currentMask = registry[i];
            if (currentMask._unmaskedTargets[target.getID()]) {
                targetLevel = i;
                // Always remove 'masked' targets from the masks' "unmaskedTargets" lists
                var map = currentMask._unmaskedTargets;
                if (map[target.getID()] === target) delete map[target.getID()];
                
            }
        }

        // If the target was unmasked wrt the top hard mask we need to hard mask it now.
        if (topHardMask != null && targetLevel != null && (topHardMask <= targetLevel)) {
            targetsToHardMask.add(target);
        }
    }
    // HardMaskTargets will handle 
    // - putting the targets behind the screenSpan if necessary
    // - getting rid of accessKey on the handle.
    if (topHardMask != null) this._hardMaskTargets(targetsToHardMask, null, false, false);
},

//> @classMethod    isc.EventHandler.addUnmaskedTarget()
//
//      Ensure that a widget (or array of widgets) is not masked by the clickMask.
//
//      @group  clickMask
//      @param  target      (widget | Array of widgets)
//                  target[s] to unmask
//      @param  [maskID]    (string)
//                  ID of clickmask to move this target above.  If not passed in, will move above
//                  all visible clickMasks
// @visibility eventhandler
//<
addUnmaskedTarget : function (target, maskID) {
    // synonym for addUnmaskedTargets
    return this.addUnmaskedTargets(target, maskID);
},
										
//> @classMethod    isc.EventHandler.addUnmaskedTargets()
//
//      Synonym for addUnmaskedTarget.
//
//      @group  clickMask
//      @param  target      (widget | Array of widgets)
//                  target[s] to unmask
//      @param  [maskID]    (string)
//                  ID of clickmask to move this target above.  If not passed in, will move above
//                  all visible clickMasks
// @visibility eventhandler
//<
// @param [recursive] (boolean) Internal debugging parameter indicating this is a call from 
//      within an addUnmaskedTargets() call, adding children of some target to the unmasked 
//      targets list

addUnmaskedTargets : function (targets, maskID) {

    // avoid unmasking targets in response to adjusting z-index as part of adjustSpanZIndex
    if (isc._unmaskOnBringToFront && this._adjustSpanZIndexRunning) return;

    var registry = this.clickMaskRegistry;
    if (targets == null || registry.length == 0) return;
    // support 'targets' being an array or a single widget
    if (!isc.isAn.Array(targets)) targets = [targets];

    if (targets.length == 0) return;
    var mask;
    
    // if passed no mask ID, completely unmask (so add to TOP mask's list of unmaskedTargets)
    if (maskID == null) {
        mask = registry.last();
    } else {
        if (isc.isA.String(maskID)) mask = this.getClickMask(maskID);
        // support being passed a mask object as well as an ID
        else mask = maskID;
    }
    // If we couldn't get a mask, bail.
    if (mask == null) {
        // log at the info level -- this is likely to happen if the mask was hidden already, so 
        // a logWarn is a little strong
        this.logInfo("addUnmaskedTargets called with invalid maskID - returning.", "clickMask")
        return;
    }

    // If we're "hard unmasking" anything, we need to ensure we hard unmask its ancestors as
    // well as children. We don't support a masked parent with unmasked children for 
    // hard masks.
    var hardMask = mask;
    while (hardMask && !this.isHardMask(hardMask)) {
        hardMask = registry[registry.indexOf(hardMask) -1];
    }
    if (hardMask != null) {
        
        if (isc._unmaskOnBringToFront && targets.length == 1 && targets[0].topElement != null) {
            //this.logWarn("not treating bringToFront as unmask because widget is not top-level: " +
            //             targets[0] + ", topElement: " + targets[0].topElement);
            return;
        }
    }
    
    // Combine ancestors (where appropriate), peers, descendants into the unmaskedTargets list
    targets = this._getFullSetOfTargetsToUnmask(targets, mask);

    //>DEBUG
    if (this.logIsDebugEnabled("clickMask")) {
        this.logDebug("Added unmasked targets:" + targets.getProperty("ID") + 
                      " [+ decendants] to clickMask with ID: " + mask.ID , "clickMask");
    }
    //<DEBUG
    
    var hardMaskAbove = false;
    for (var i = registry.indexOf(mask)+1; i < registry.length; i++) {
        if (this.isHardMask(registry[i])) hardMaskAbove = true;
    }
    
    for (var n = 0; n < targets.length; n++) {
        var target = targets[n];
        
        
        if (mask._unmaskedTargets == null) mask._unmaskedTargets = {};
        mask._unmaskedTargets[target.getID()] = target;
    }
   
    // Each target will be unmasked relative to the mask in question and any masks 
    // underneath it
    // If it was previously masked by a hard mask, and there is no hard mask ABOVE this one
    // we need to shift above the screenSpan / reset accessKey
    
    if (!hardMaskAbove) {
        this._hardUnmaskTargets(targets);
    }
},

//> @classMethod isc.EventHandler.targetIsMasked() (A)
// Return whether this Canvas is masked by a clickMask (see +link{Canvas.showClickMask()}).
//
// @param target (Canvas) widget to check
// @return (Boolean)   true if masked, false if not masked.
// @group clickMask
// @visibility external
//<
// Internal-only parameters:
// @param [maskID] (string) ID of click mask to check against - if not passed in, method
//                          will determine whether the widget is above the top clickMask.
// @param [hardMaskedOnly] (boolean) whether to consider only hard masks when checking
//                                   for masking
targetIsMasked : function (target, maskID, cancelOnly) {
    var registry = this.clickMaskRegistry;
    if (registry.length == 0) return false;
    
    // if we weren't given a target, a clickmask is up and the event occurred over a 
    // native page element rather than a widget - so the target is masked.
    if (target == null) return true;
    
    // If we weren't passed a maskID, just look at the topmost mask
    var mask;
    if (maskID == null) mask = registry.last();
    else if (isc.isA.String(maskID)) mask = registry.find("ID", maskID);
    else mask = maskID;
    if (!isc.isAn.Object(mask)) {
        this.logWarn("EventHandler.targetIsMasked() passed invalid maskID:" + maskID, 
                     "clickMask");
        return false;
    }
    
    var initialIndex = registry.indexOf(mask);
    var wouldCancelClick = false;
    for (var i = initialIndex; i < registry.length; i++) {
        // On the first iteration we already have a pointer to the mask
        if (i != initialIndex) mask = registry[i];
        
        // consider only masks that would cancel a click
        if (cancelOnly) {
            if (mask.mode == isc.EH.HARD || mask.mode == isc.EH.SOFT_CANCEL) {
                wouldCancelClick = true;
            } else {
                //this.logWarn("ignoring mask with mode: " + mask.mode);
                continue;
            }
        }

        if (mask._unmaskedTargets) {
            if (mask._unmaskedTargets[target.getID()]) return false;
            
            
            if (isc.DrawItem && isc.isA.DrawItem(target)) {
                var pane = target.drawPane;
                
                if (pane && pane.getID && mask._unmaskedTargets[pane.getID()]) return false;
            }
            
            // Special case: form items written into an unmasked container item should be treated as
            // unmasked (even if the form itself is masked)
            
            if (isc.isA.DynamicForm!=null && isc.isA.DynamicForm(target)) {
                var itemInfo = target._getEventTargetItemInfo(isc.EH.lastEvent);
                if (itemInfo && itemInfo.item && 
                    itemInfo.item.form == target && itemInfo.item.containerWidget != target &&
                    mask._unmaskedTargets[itemInfo.item.containerWidget.getID()]) return false;
            }
        }
    }
    
    return (cancelOnly && !wouldCancelClick ? false : true);
},

//> @classMethod    isc.EventHandler.clickMaskClick()
//
//      Called when a mouseDown occurred over a widget that may be masked by a clickMask.
//      If the target is masked, fire the appropriate clickMask action.
//      Returns true if the target is not masked, or the clickMask auto-hides (allows the
//      mouseDown event to proceed to it's target)
//      Returns false if the target is masked, and the clickMask is hard or has mode "softCancel" -- 
//      prevents the target from recieving the mouseDown event.
//
//      @group  clickMask
//      @param  target  (widget)    target of the mouseDown event.
//      @return         (boolean)   
//          True to allow the mouseDown event to proceed, false to cancel the event.
//      @visibility internal
//<
clickMaskClick : function (target) {

    // copy the clickMaskRegistry, so we don't get confused if the registry is modified by
    // the click action showing additional masks(for example)
    var maskReg = this.clickMaskRegistry.duplicate(),
        mask = maskReg.last();
     
    while (mask != null && (this.targetIsMasked(target) || target == this._screenSpan)) {
        if (this.logIsInfoEnabled("clickMask")) {
            this.logInfo("mouseDown on masked " + target + 
                          (mask.clickAction != null ? " firing clickAction, " : "") +
                          (mask.autoHide ? 
                            "will hide mask" + 
                                (mask.mode == isc.EH.SOFT_CANCEL ? " and block click" : "") : 
                           "will block click"));
        }
        var cancel = (mask.mode != isc.EH.SOFT);
        this._clickMaskClick(mask)

                
        // If the mask is hard return false to cancel the event -- we're done
        if (cancel) return false;

        // If the mask is soft (and not "softCancel"), fire clickMaskClick on the mask underneath it
        mask = maskReg[maskReg.indexOf(mask) -1];
    }
    
    // if we got here we've hit an unmasked target (possibly after hiding some autoHide true CM's)
    return true;
},

// actually fire the click action and (if appropriate) hide the mask.
_clickMaskClick : function (mask) {

    var autoHide = mask.autoHide,
        clickAction = mask.clickAction;

    if (autoHide == true) this.hideClickMask(mask.ID);

    // Fire the action if there is one.
    // Note: we don't care about the return value from the clickAction.
    if (clickAction != null) this.fireCallback(clickAction);
}

});	// END isc.EventHandler.addClassMethods()

// call captureEvents now to set things up for our event handling.
isc.EventHandler.captureEvents();



