
/*

  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).

*/
// Node.contains() was introduced in Gecko 9.
// https://developer.mozilla.org/en-US/docs/Web/API/Node.contains
if (!("contains" in document.documentElement) && window.Node) {
    Node.prototype.contains = function (otherNode) {
        for (; otherNode != null; otherNode = otherNode.parentNode) {
            if (this == otherNode) return true;
        }
        return false;
    };
}

//>	@class	Element
//
// Helper class containing methods for direct DOM interaction. Note that even if 
// +link{isc, isc_useSimpleNames} is true, this class is not available in the global scope
// as <code>window.Element</code> - to access it developers must always use 
// <code>isc.Element</code>
//
//  @treeLocation Client Reference/Foundation
//  @visibility internal
//<
// Currently has no exposed methods - Developers typically will only need to interact with 
// higher level canvas methods
isc.ClassFactory.defineClass("Element", null, null, true);

isc.Element.addClassProperties({

// The browser's prefix for experimental/unspec'd CSS properties, as it would appear in CSS text.
vendorCSSPrefix: (isc.Browser.isMoz ? "-moz-" :
                  isc.Browser.isChrome ? "-webkit-" :
                  isc.Browser.isSafari ? "-webkit-" :
                  isc.Browser.isOpera ? "-o-" :
                  isc.Browser.isIE ? "-ms-" :
                  ""),

// The browser's prefix for CSSStyleDeclaration properties corresponding to experimental/unspec'd
// CSS properties.
// https://github.com/Modernizr/Modernizr/blob/master/src/omPrefixes.js
vendorStylePrefix: (isc.Browser.isMoz ? "Moz" :
                    isc.Browser.isChrome ? "Webkit" :
                    isc.Browser.isSafari ? "Webkit" :
                    isc.Browser.isOpera ? "O" :
                    isc.Browser.isIE ? "ms" :
                    "")

});

isc.Element.addClassMethods({


// --------------------------------------------------------------------------------------------
// DOM Access / Manipulation

//>	@classMethod	Element.get()
//		Like the DOM method document.getElementById(), but works in all supported browsers.
//<
get : function (id, doc) {
    doc = doc || this.getDocument();
    if (isc.Browser.isDOM) return doc.getElementById(id);
},


// _getElementFromSelection()
// Determine which DOM element contains the current selection.
// 'doc' param allows caller to pass in a pointer to the document element - (may be document
// element from some frame/iframe - if not specified the main page document is used).

_getElementFromSelection : function (doc) {

    

    if (!doc) doc = document;

    if (isc.Browser._hasDOMRanges) {
        var selection = doc.getSelection();
        if (!selection.rangeCount) return null;
        
        var commonAncestorContainer = selection.getRangeAt(0).commonAncestorContainer;
        while (commonAncestorContainer != null && commonAncestorContainer.nodeType != 1) {
            commonAncestorContainer = commonAncestorContainer.parentNode;
        }
        return commonAncestorContainer;
    } else if (isc.Browser.isIE) {
        var selection = doc.selection;
        // In some cases, Internet Explorer can throw an exception when on
        // attempting to access the selection.type attribute (though the
        // attribute does appear to be defined).
        
        try {
            var type = selection.type.toLowerCase();
        } catch (e) {
            return null;
        }
        var isText = (type == "text" || type == "none");

        if (!selection) return null;

        // If it's a text range use the 'parentElement()' method to determine what element
        // contains the text.
        // NOTE: an empty selection will be reported as type "None", but can be used to create
        // a zero char text range, so we treat it like a "Text" selection.
        if (isText) {
            var range;
            
            try {
                range = selection.createRange();
            } catch (e) {
                
            }
            return range ? range.parentElement() : null;

        // If it's a control range, we can get at the elements in the control range
        // by index.    Iterate through the elements and find the common ancester.
        
        } else {  
            // If this is a control range 
            // We're interested in the first common ancestor of the elements
            var range = selection.createRange(),
                commonParent;
            for (var i = 0; i < range.length; i++) {

                if (!commonParent) {
                    commonParent = range(i).parentElement;                

                } else {
                    // To determine whether the element is contained by the common parent, 
                    // we're creating a textRange from both elements and using the inRange
                    // method.
                    while (!commonParent.contains(range(i))) {
                        commonParent = commonParent.parentElement;
                    }
                } 
                
            }
            return commonParent;
        }
    }
},

// From SmartGWT.mobile's `com.smartgwt.mobile.client.internal.util.ElementUtil'
hasClassName : function (element, className) {
    if (!className) return false;
    var str = element.className,
        pos = str.indexOf(className);
    while (pos != -1) {
        if (pos == 0 || str[pos - 1] == ' ') {
            pos += className.length;
            if (pos == str.length || str[pos] == ' ') {
                return true;
            }
        } else pos += className.length;
        if (pos >= str.length) break;
        pos = str.indexOf(className, pos);
    }
    return false;
},

// Calls `elementCallback' on each descendant element of `element' having the given CSS class.
// https://developer.mozilla.org/en-US/docs/Web/API/element.querySelectorAll
forEachDescendantHavingClass : function (element, className, elementCallback) {
    if (element == null || !className) return;

    if (element.querySelectorAll) {
        var matches = element.querySelectorAll("." + className),
            len = matches.length;
        for (var ri = len; ri > 0; --ri) {
            elementCallback(matches[ri - 1]);
        }
    } else {
        var children = element.childNodes,
            len = children.length;
        for (var ri = len; ri > 0; --ri) {
            var child = children[ri - 1];

            // Skip the child node if it is not an element.
            if (child.nodeType != 1) continue;

            // Recurse over children of the child.
            this.forEachDescendantHavingClass(child, className, elementCallback);

            if (this.hasClassName(child, className)) elementCallback(child);
        }
    }
},

// Given an element attribute, iterate recursively through child nodes till you find a match.
// May be slow for deep hierarchies
findAttribute : function (element, attribute, value) {
    if (!element) return null;    
    if (element[attribute] == value || 
    (element.getAttribute && element.getAttribute(attribute) == value)) {   
        return element;
    }
    var children = element.childNodes;
    for (var i = 0; i < children.length; i++) {
        var subElement = this.findAttribute(children[i], attribute, value);
        if (subElement) return subElement;
    }
    return null;
    
},


// helpers for createAbsoluteElement
_insertAfterBodyStart : window.isc_insertAfterBodyStart,
_globalInsertionMarker : "isc_global_insertion_marker",
getInsertionMarkerHTML : function () {
    return "<span id='"+this._globalInsertionMarker+"' style='display:none'></span>";
},
getInsertionMarker : function () {
    return document.getElementById(this._globalInsertionMarker);
},
// create a new, absolutely positioned element, after page load
_$afterBegin : "afterBegin",
_$afterEnd : "afterEnd",
_$beforeBegin: "beforeBegin",
_$beforeEnd : "beforeEnd",
createAbsoluteElement : function (html, targetWindow) {
    var wd = targetWindow || this.getWindow(),
         
        body = this.getDocumentBody(true);

    
    
    //>DEBUG
    // if there's no body tag, we bail
    if (body == null && !isc.Element.noBodyTagMessageShown) {
        isc.Element.noBodyTagMessageShown = true;
        var msg ="Error: Attempt to write content into a page outside the BODY tag.  Isomorphic " +
            "SmartClient requires this tag be present and all widgets be written out inside " +
            "it.\r" +
            "Please ensure your file has a BODY tag and any code to draw SmartClient widgets " +
            "is enclosed in this tag."
            ;
        //alert(msg);
        this.logError(msg);
        return;
    }
    //<DEBUG

    

    // safety valve - use a global var to switch back to our previous rendering mode - set
    // window.isc_insertAfterBodyStart to enable this rendering mode.
    if (this._insertAfterBodyStart) {
        return isc.Element.insertAdjacentHTML(body, this._$afterBegin, html, true);
    }

    if (isc.Browser.isIE) {
        if (!this._insertionMarker) {
            if (body.childNodes.length < 2) {
                // empty body or body with just one element, in either case insert afterBegin
                // of the body on the assumption that the one element may not be closed.
                isc.Element.insertAdjacentHTML(body, this._$afterBegin, this.getInsertionMarkerHTML());
            } else {
                // insert right before the last element
                //
                // If the last element is a text node, spin back through the siblings until we
                // find one that isn't a text node because calling
                // textNode.insertAdjacentHTML() results in a "no such method" in IE
                //
                // One natural way in which such text elements get created is by the use of an
                // <INPUT> element with no enclosing <FORM> tag, right at the end of the page.
                var node = body.lastChild;
                while (node && node.nodeType == 3) node = node.previousSibling;
                if (node != null) {
                    isc.Element.insertAdjacentHTML(node, this._$beforeBegin, 
                                                  this.getInsertionMarkerHTML());
                } else {
                    // all nodes of the body are text nodes, insert after body begin
                    isc.Element.insertAdjacentHTML(body, this._$afterBegin, this.getInsertionMarkerHTML());
                }
            }
            this._insertionMarker = this.getInsertionMarker();
        }
        return isc.Element.insertAdjacentHTML(this._insertionMarker, this._$afterEnd, html, true);            
    } else {
        return isc.Element.insertAdjacentHTML(body, this._$beforeEnd, html, true);
    }
},

// emulate IE's insertAdjacentHTML on any fully DOM-compliant browser
insertAdjacentHTML : function (element, where, html, singleElement) {
    where = where.toLowerCase(); // case-insensitive match

    // handle string element IDs
    if (isc.isA.String(element)) element = isc.Element.get(element);

    //>DEBUG
    if (!element) this.logWarn("insertAdjacentHTML: element is null for where: '" + where + 
                                "' with html: " + html);
    //<DEBUG

    // Use insertAdjacentHTML() if it is available.
    
    if (isc.Browser.useInsertAdjacentHTML) {
        try {
            element.insertAdjacentHTML(where, html);

            if (singleElement) {
                
                switch (where) {
                    case "beforebegin":
                        return element.previousSibling;
                    case "afterbegin":
                        return element.firstChild;
                    case "beforeend":
                        return element.lastChild;
                    case "afterend":
                        return element.nextSibling;
                }
            }
            return;
        } catch (e) {
            // In IE 6, 7, 8, and 9, insertAdjacentHTML() does not work on some elements,
            // notably TABLE, THEAD, TBODY, TFOOT, and TR elements. Attempting to call
            // insertAdjacentHTML() on one of those elements results in an exception
            // "Invalid target element for this operation.", error number -2146827688.
            //
            // If that happens, fall through to the alternative implementation.
        }
    }

    //this.logWarn("inserting at element: " + this.echoLeaf(element) + 
    //             " at position " + where + ", html: " + this.echoLeaf(html));


    
    var newElement,
        doc = element.ownerDocument;
    if (!singleElement && isc.Browser.useCreateContextualFragment) {
        // create a document fragment from the HTML via Range.createContextualFragment()
        var range = doc.createRange();
        range.setStartBefore(element);
        newElement = range.createContextualFragment(html);
    } else {
        var wrapper = doc.createElement("DIV");
        
        if (element.tagName == "TR" && isc.Browser.isIE) {
            wrapper.innerHTML = "<table><tbody><tr>" + html + "</tr></tbody></table>";
            wrapper = wrapper.firstChild.firstChild.firstChild;
        } else {
            wrapper.innerHTML = html;
        }
        if (singleElement || wrapper.firstChild == wrapper.lastChild) newElement = wrapper.firstChild;
        else {
            newElement = doc.createDocumentFragment();
            var child;
            while (child = wrapper.firstChild) {
                newElement.appendChild(child);
            }
        }
    }

    // insert it into the given parent
    switch (where){
    case "beforebegin":
        element.parentNode.insertBefore(newElement, element);
		break;
    case "afterbegin":
		element.insertBefore(newElement, element.firstChild);
		break;
    case "beforeend":
		element.appendChild(newElement);
		break;
    case "afterend":
		if (element.nextSibling) element.parentNode.insertBefore(newElement, element.nextSibling);
		else element.parentNode.appendChild(newElement);
		break;
	}
    if (singleElement) return newElement;
},

// clear the element passed in (removing its HTML from the DOM)
clear : function (element, useRemoveChild) {
    if (element == null) return;

    
    if (!useRemoveChild && isc.Page.isLoaded() && isc.Browser.isIE &&
        element.ownerDocument.documentElement.contains(element))
    {
        element.outerHTML = isc.emptyString;
        return;
    }

    if (element.parentNode != null) {
        element.parentNode.removeChild(element);
    } else {
        
        //>DEBUG
        isc.Log.logWarn("element parentNode null"); //<DEBUG
        element.innerHTML = "";
    }
},

// ----------------------------------------------------------------------------------------
// Deriving sizing/positioning + margins etc information from HTML elements
// ----------------------------------------------------------------------------------------
// As with Canvii, these methods will work with the size of the HTML element, INCLUDING any
// margins wherever appropriate.
// This means:
// - getOffsetLeft(element) / getOffsetTop(element) return the offset top / left of the element's
//   margin, rather than of the element itself
// - getVisibleWidth(element) / getVisibleHeight(element) return the height / width of the element
//   including top and bottom margins.


_boxSizingCSSName: ("boxSizing" in document.documentElement.style
                    ? "box-sizing"
                    : isc.Element.vendorCSSPrefix + "box-sizing"),
_boxSizingStyleName: ("boxSizing" in document.documentElement.style
                      ? "boxSizing"
                      : isc.Element.vendorStylePrefix + "BoxSizing"),

// helper: Does this element adhere to the border-box model or the content-box model for sizing?
isBorderBox : function (element) {
    if (!element) return false;
    if (!isc.Browser.isMoz) return isc.Browser.isBorderBox;
    
    return (element.style[this._boxSizingStyleName] === "border-box");
},

// Return the scrollHeight (scrollable height) for the element.
getScrollHeight : function (element) {

    if (element == null) return 0;

    
    var height = ((element.scrollHeight!= null && element.scrollHeight != "undefined") 
                                                ? element.scrollHeight : element.offsetHeight);

    
    var largestBottom = this._getPositionedChildrenBottom(element);

    return largestBottom > height ? largestBottom : height;
},

// get the largest bottom coordinate for any explicitly positioned DOM children of this element
_getPositionedChildrenBottom : function (element) {
    if (element.childNodes == null) return 0;

    var largest = 0,
        // constants for determining whether a DOM node is an element.  
        
        elementType = document.ELEMENT_NODE || 1,
        debug = this.logIsDebugEnabled("sizing");

    for (var i = 0; i < element.childNodes.length; i++) {
        var child = element.childNodes.item(i);
        
        // ignore anything that isn't an element (only elements report any size information)
        if (child.nodeType != elementType) continue;
        
        var childPosition = isc.Element.getComputedStyleAttribute(child, "position");
        
        // get the top coordinate of the child
        var childTop = 0;
        if (childPosition == isc.Canvas.ABSOLUTE || childPosition == isc.Canvas.RELATIVE) {
            childTop += isc.Element.getOffsetTop(child);
        } else {
            // inline content ("position" property unset).  We don't inspect this because the
            // scrollWidth reported by the element includes inline content
            continue;
        }

        
        var canvas = child.getAttribute("eventProxy"),
            childVisibleHeight;
        if (canvas != null && 
            !isc.isAn.emptyString(canvas) && 
            !window[canvas]._retrievingScrollHeight &&
            isc.isA.Function(window[canvas].getVisibleHeight)) 
        {
            childVisibleHeight = window[canvas].getVisibleHeight();
        } else {
            // For regular DOM elements call isc.Element.getVisibleHeight(element) instead
            childVisibleHeight = isc.Element.getVisibleHeight(child);
        }
        
        var childBottom = childTop + childVisibleHeight;
        // Notes:
        // - the 'visibleHeight' is the height of this child, including any margins.
        //   if this (parent) is scrollable, and the child is absolutely positioned, we 
        //   natively can't scroll to the right/bottom margin, so deduct this from the reported
        //   parent scroll-width.
        // - This child will be drawn over the top of any padding applied to the element, so we
        //   don't need to add that to the childBottom value.  Only inline elements will force
        //   the parents' padding to show up below them.
        if (childPosition == isc.Canvas.ABSOLUTE && 
            (element.style.overflow == isc.Canvas.SCROLL ||
             element.style.overflow == isc.Canvas.AUTO ||
             element.style.overflow == isc.Canvas.HIDDEN))
             childBottom -= isc.Element.getBottomMargin(child);
        
        
        
        if (childBottom > largest) largest = childBottom;

        
    }
    return largest;
},

// isc.Element.getScrollWidth(element) - See comments for getScrollHeight
getScrollWidth : function (element) {
    if (element == null) return 0;
    
    
    var width = ((element.scrollWidth != null && element.scrollWidth != "undefined") ? 
                     element.scrollWidth : element.offsetWidth);
    
    // if we have any position:absolute or position:relative children, find the right-most one
    var largestRight = this._getPositionedChildrenRight(element);

    return largestRight > width ? largestRight : width;
},

// get the largest right coordinate for any explicitly positioned DOM children of this element
_getPositionedChildrenRight : function (element) {
    if (element.childNodes == null) return 0;

    var largest = 0,
        // constants for determining whether a DOM node is an element.  
        
        elementType = document.ELEMENT_NODE || 1,
        debug = this.logIsDebugEnabled("sizing");

    for (var i = 0; i < element.childNodes.length; i++) {
        var child = element.childNodes.item(i);
        
        if (child.nodeType != elementType) continue;
        
        var childStyle = isc.Element.getComputedStyle(child, ["position", "display", "left"]);
        
        var childLeft = 0;
        if (childStyle.position == isc.Canvas.ABSOLUTE || 
            childStyle.position == isc.Canvas.RELATIVE) 
        {
            childLeft = isc.Element.getOffsetLeft(child);
        } else {
            // inline content ("position" property unset).  We don't inspect this because the
            // scrollWidth reported by the element includes inline content
            continue;
        }
 
        
        var canvas = child.getAttribute("eventProxy"),
            childVisibleWidth;
        if (canvas != null && 
            !isc.isAn.emptyString(canvas) && 
            !window[canvas]._retrievingScrollWidth &&
            isc.isA.Function(window[canvas].getVisibleWidth)) 
        {
            childVisibleWidth = window[canvas].getVisibleWidth();
        } else {
            // For regular DOM elements call isc.Element.getVisibleWidth(element) instead
            childVisibleWidth = isc.Element.getVisibleWidth(child);
        }
        
        var childRight = childLeft + childVisibleWidth;
        if (element.style.overflow == isc.Canvas.SCROLL || 
            element.style.overflow == isc.Canvas.HIDDEN ||
            element.style.overflow == isc.Canvas.AUTO) {
                childRight -= isc.Element.getRightMargin(child);
       }
        
        if (childRight > largest) largest = childRight;
 
        //>DEBUG
        if (debug) {
            this.logInfo("getChildNodesRight: child node " + i + " of " + 
                         element.childNodes.length + " (" + this.echoLeaf(child) + ")" +
                         " left:" + childLeft + ", width: " + childVisibleWidth + 
                         ", right:" + childRight, "sizing");
        }
        //<DEBUG
    }
    return largest;
},

getClientWidth : function (element) {
    
    if (isc.Browser.isIE && (isc.Browser.isIE9 || isc.Browser.version >= 10)) {
        // IE 9 Strict Mode and IE 10 have getComputedStyle().
        var cssStyleDecl = window.getComputedStyle(element, null),
            
            clientWidth = parseFloat(cssStyleDecl.width) + parseFloat(cssStyleDecl.paddingRight) +
                          parseFloat(cssStyleDecl.paddingLeft);
        return Math.ceil(clientWidth);
    } else {
        return element.clientWidth;
    }
},

getElementRect : function (element) {
    var body = this.getDocumentBody(),
        left = this.getLeftOffset(element, body), 
        top = this.getTopOffset(element, body);

    var width = 0, height = 0;
    if (element.style && element.style.overflow == "visible") {
        width = this.getScrollWidth(element);
        height = this.getScrollHeight(element);
    }
    
    width = Math.max(element.offsetWidth, element.clientWidth, width);
    height = Math.max(element.offsetHeight, element.clientHeight, height);
    return [ left, top, width, height ];
},

// get the inner width of an arbitrary dom element
// Note: we use this for widgets with htmlElement and matchElement set.
// Implementation doesn't cache results - don't use this in critical path code as it may be
// somewhat slow
getInnerWidth : function (element) {
    // assume content-box sizing (the default)
    // If specified style.width will be the available 'inner' width, excluding padding, 
    // margin, border
    // (ignore element overflow for now)
    var styleWidth = element.style.width;
    if (styleWidth != null && !isc.isAn.emptyString(styleWidth)) {
        styleWidth = parseInt(styleWidth);
        if (isc.isA.Number(styleWidth)) return styleWidth;
    }
    
    // If width is unspecified - measure how large the element rendered out.
    //
    // element.clientWidth will be the width of the element excluding border and margin,
    // but including padding. Delete the padding thickness to get the widget we want.
    var clientWidth = element.clientWidth,
        paddingLeft = parseInt(this.getComputedStyleAttribute("paddingLeft")),
        paddingRight = parseInt(this.getComputedStyleAttribute("paddingRight")),
        padding = paddingLeft + paddingRight;
    if (isc.isA.Number(padding)) clientWidth -= padding;
    return clientWidth;
},
getInnerHeight : function (element) {
    // assume content-box sizing (the default)
    // If specified style.width will be the available 'inner' width, excluding padding, 
    // margin, border
    // (ignore element overflow for now)
    var styleHeight = element.style.height;
    if (styleHeight != null && !isc.isAn.emptyString(styleHeight)) {
        styleHeight = parseInt(styleHeight);
        if (isc.isA.Number(styleHeight)) return styleHeight;
    }
    
    // If height is unspecified - measure how large the element rendered out.
    var clientHeight = element.clientHeight,
        paddingTop = parseInt(this.getComputedStyleAttribute("paddingTop")),
        paddingBottom = parseInt(this.getComputedStyleAttribute("paddingBottom")),
        padding = paddingTop + paddingBottom;
    if (isc.isA.Number(padding)) clientHeight -= padding;
    return clientHeight;
},


getNativeInnerWidth : function (element) {
    if (isc.Browser.isMoz) return this.getInnerWidth(element);
    var width = element.offsetWidth;
    // 0 or null
    if (!width) width = this.getInnerWidth(element);
    return width;
},
getNativeInnerHeight : function (element) {
    if (isc.Browser.isMoz) return this.getInnerHeight(element);
    var height = element.offsetHeight;
    // 0 or null
    if (!height) height = this.getInnerHeight(element);
    return height;
},




// Methods to get the margin sizes for an element

getTopMargin : function (element) {
    if (element != null) {
        var topMargin;
        if (element.style != null) topMargin = parseInt(element.style.marginTop);
        if (isc.isA.Number(topMargin)) return topMargin;
        if (element.className != null) return isc.Element._getTopMargin(element.className);
    }
    return 0;
},
getBottomMargin : function (element) {
    if (element != null) {
        var bottomMargin;
        if (element.style != null) bottomMargin = parseInt(element.style.marginBottom);
        if (isc.isA.Number(bottomMargin)) return bottomMargin;
        if (element.className != null) return isc.Element._getBottomMargin(element.className);
    }
    return 0;
},
getLeftMargin : function (element) {
    if (element != null) {
        var leftMargin;
        if (element.style != null) leftMargin = parseInt(element.style.marginLeft);
        if (isc.isA.Number(leftMargin)) return leftMargin;
        if (element.className != null) return isc.Element._getLeftMargin(element.className);
    }
    return 0;
},
getRightMargin : function (element) {
    if (element != null) {
        var rightMargin;
        if (element.style != null) rightMargin = parseInt(element.style.marginRight);
        if (isc.isA.Number(rightMargin)) return rightMargin;
        if (element.className != null) return isc.Element._getRightMargin(element.className);
    }
    return 0;
},

getHMarginSize : function (element) {
    return isc.Element.getLeftMargin(element) + isc.Element.getRightMargin(element);
},
getVMarginSize : function (element) {
    return isc.Element.getTopMargin(element) + isc.Element.getBottomMargin(element);
},

// element.currentStyle gives us the computed style of an element in IE / Opera
// Not available in IE9 [rendering in IE9 rendering mode]
_useCurrentStyle:(isc.Browser.isIE && !isc.Browser.isIE9) || isc.Browser.isOpera, 

getTopBorderSize : function (element) {
    if (element == null) return 0;
    if (isc.Browser.isOpera && element.currentStyle.borderTopStyle == this._$none) return 0;
    var borderSize = (this._useCurrentStyle
                        ? parseInt(element.currentStyle.borderTopWidth)
                        : parseInt(isc.Element.getComputedStyleAttribute(element, "borderTopWidth"))
                      );
                      
    return isNaN(borderSize) ? 0 : borderSize;
},

getBottomBorderSize : function (element) {
    if (element == null) return 0;
    if (isc.Browser.isOpera && element.currentStyle.borderBottomStyle == this._$none) return 0;    
    var borderSize = (this._useCurrentStyle
                        ? parseInt(element.currentStyle.borderBottomWidth)
                        : parseInt(isc.Element.getComputedStyleAttribute(element, "borderBottomWidth"))
                     );
    return isNaN(borderSize) ? 0 : borderSize;
},

getLeftBorderSize : function (element) {
    if (element == null) return 0;
    if (isc.Browser.isOpera && element.currentStyle.borderLeftStyle == this._$none) return 0;    
    var borderSize = (this._useCurrentStyle
                        ? parseInt(element.currentStyle.borderLeftWidth)
                        : parseInt(isc.Element.getComputedStyleAttribute(element, "borderLeftWidth"))
                     );
    return isNaN(borderSize) ? 0 : borderSize;
},

getRightBorderSize : function (element) {
    if (element == null) return 0;
    if (isc.Browser.isOpera && element.currentStyle.borderRightStyle == this._$none) return 0;
    var borderSize = (this._useCurrentStyle
                        ? parseInt(element.currentStyle.borderRightWidth)
                        : parseInt(isc.Element.getComputedStyleAttribute(element, "borderRightWidth"))
                      );
    return isNaN(borderSize) ? 0 : borderSize;
},

getBorderSizes: function (element) {
    var result = {
        top: isc.Element.getTopBorderSize(element),
        bottom: isc.Element.getBottomBorderSize(element),
        left: isc.Element.getLeftBorderSize(element),
        right: isc.Element.getRightBorderSize(element)
    };
    result.Top = result.top;
    result.Bottom = result.bottom;
    result.Left = result.left;
    result.Right = result.right;
    return result;
},

getVBorderSize : function (element) {
    return isc.Element.getTopBorderSize(element) + isc.Element.getBottomBorderSize(element);
},
getHBorderSize : function (element) {
    return isc.Element.getLeftBorderSize(element) + isc.Element.getRightBorderSize(element);
},

getTopPaddingSize : function (element) {
    if (element == null) return 0;
    var paddingSize = (this._useCurrentStyle
                        ? parseInt(element.currentStyle.paddingTop)
                        : parseInt(isc.Element.getComputedStyleAttribute(element, "paddingTop"))
                      );
    return isNaN(paddingSize) ? 0 : paddingSize;
},

getBottomPaddingSize : function (element) {
    if (element == null) return 0;
    var paddingSize = (this._useCurrentStyle
                        ? parseInt(element.currentStyle.paddingBottom)
                        : parseInt(isc.Element.getComputedStyleAttribute(element, "paddingBottom"))
                      );
    return isNaN(paddingSize) ? 0 : paddingSize;
},

getLeftPaddingSize : function (element) {
    if (element == null) return 0;
    var paddingSize = (this._useCurrentStyle
                        ? parseInt(element.currentStyle.paddingLeft)
                        : parseInt(isc.Element.getComputedStyleAttribute(element, "paddingLeft"))
                      );
    return isNaN(paddingSize) ? 0 : paddingSize;
},

getRightPaddingSize : function (element) {
    if (element == null) return 0;
    var paddingSize = (this._useCurrentStyle
                        ? parseInt(element.currentStyle.paddingRight)
                        : parseInt(isc.Element.getComputedStyleAttribute(element, "paddingRight"))
                      );
    return isNaN(paddingSize) ? 0 : paddingSize;
},

getVPaddingSize : function (element) {
    return isc.Element.getTopPaddingSize(element) + isc.Element.getBottomPaddingSize(element);
},
getHPaddingSize : function (element) {
    return isc.Element.getLeftPaddingSize(element) + isc.Element.getRightPaddingSize(element);
},

// getVisibleWidth / getVisibleHeight:
// when passed a DOM element, return the drawn size of the element, including any overflow, 
// border, margin or padding.
getVisibleWidth : function (element) {
    if (element == null) return 0;
    
    var overflow = isc.Element.getComputedStyleAttribute(element, "overflow"),
        width;
    if (overflow == isc.Canvas.VISIBLE || !isc.isA.Number(parseInt(element.style.width))) {
        width = isc.Element.getScrollWidth(element) + 
                isc.Element.getHBorderSize(element);

    } else {
        // use the specified width
        width = parseInt(element.style.width);
    }
    return width + isc.Element.getHMarginSize(element);
},

getVisibleHeight : function (element) {
    if (element == null) return 0;

    var overflow = isc.Element.getComputedStyleAttribute(element, "overflow"),
        height;
    if (overflow == isc.Canvas.VISIBLE || !isc.isA.Number(parseInt(element.style.height))) {
        height = isc.Element.getScrollHeight(element) + isc.Element.getVBorderSize(element);
    } else {
        // use the specified height
        height = parseInt(element.style.height);
    }
    return height + isc.Element.getVMarginSize(element);
},


// Element.getOffsetLeft()
//  Takes 'element'
//  element should be a pointer to a DOM element or the ID for a DOM element
//  (To get the offsetLeft for a widget use use widget.getOffsetLeft() instead)
//  Returns the true offsetLeft - the absolute left coordinate with respect to whatever is
//  reported by the DOM as the offsetParent of the element.
getOffsetLeft : function (element) {
 
    // Note: This method is used by the canvas instance 'getOffsetLeft()' method to calculate
    // the offset position.
    // We work with coordinates / sizes relative to the outside of any margins around our 
    // widgets - do the same with this method.
    
    if (element == null) {
        this.logWarn("getOffsetLeft: passed null element");
        return 0;
    }

    // IE and Moz both return somewhat unreliable values for element.offsetLeft by default.
    // Paper over these bugs and differences.
    var left = element.offsetLeft;
    // --- caching code:
    // If we've already calculated a value (based on a reported offsetLeft value), and
    // the reported value has not changed, return the previously calculated value.
    // This caching is safe except for cases where an indirect parent's styling changes in a
    // way that would affect this element's true offsetLeft.
    if (element._cachedReportedOffsetLeft == left) {
        return element._cachedCalculatedOffsetLeft;
    } else {
        // debug message for sanity checking coordinate caching
        //this.logWarn(element.getAttribute("eventProxy") + ": new DOM value for offsetLeft");
    }

    // always subtract the left margin (if there is one) to get the position OUTSIDE the
    // margins.
    // Note: for a negative margin, the reported offsetLeft does not need to be adjusted by the
    // specified margin size - it represents the position of the element - and in this case there
    // is no margin outside the element (rather the specified margin shifts the element to the 
    // left / up)
    var leftMargin = parseInt(isc.Element.getComputedStyleAttribute(element, "marginLeft"));
    if (isc.isA.Number(leftMargin) && leftMargin > 0) {
        left -= leftMargin;
    }
    
    
    var documentBody = this.getDocumentBody(),
        parentStyle,
        px = "px",
        // determine whether the element is absolutely / relatively / etc. positioned    
        elementPosition = element.style.position;

    // Workarounds for Moz        
    if (isc.Browser.isMoz && isc.Browser.version >= 58) {
        // In moz we get some unexpected results
        
        if (element.offsetParent == null) return left;
        
        if (element.offsetParent != documentBody) {
            parentStyle = this.ns.Element.getComputedStyle(element.offsetParent,
                                                           ["borderLeftWidth"]);
            
            if (element.offsetParent.style[this._boxSizingStyleName] === "border-box") {
                left -= (isc.isA.Number(parseInt(parentStyle.borderLeftWidth)) ?
                                        parseInt(parentStyle.borderLeftWidth) : 0);
            }
                  
        }
    }
    
    // Workarounds for IE
    // IE8 Strict mode (HTML4 strict doctype or HTML5 doctype) - includes parents' border
    // in reported offsetLeft/offsetTop
    if (isc.Browser.isIE8Strict && !isc.Browser.isIE9) {
        var currentParent = element.offsetParent,
            parentStyle = currentParent ? currentParent.currentStyle : null,
            borderLeftWidth = parentStyle ? parentStyle.borderLeftWidth : null;
        if (isc.isA.String(borderLeftWidth) && borderLeftWidth.contains(px)) {
            left -= parseInt(borderLeftWidth);
        }
    
    
    } else if (isc.Browser.isIE && !isc.Browser.isIE9) {
    
        

        var currentParent = element.offsetParent,
            parentStyle;
        if (parentStyle != documentBody) parentStyle = currentParent.currentStyle; 
        
        
        var hasSpecifiedSize = (element.currentStyle.height != isc.Canvas.AUTO ||
                                element.currentStyle.width != isc.Canvas.AUTO);

        
        var continueDeductingBorders = true;                                
        
        // iterate up the offsetParents till we reach the doc. body
        while (currentParent != documentBody) {

            
            
            
            if (parentStyle.position == isc.Canvas.ABSOLUTE) continueDeductingBorders = false;
            
            
            if (parentStyle.width == isc.Canvas.AUTO && 
                parentStyle.height == isc.Canvas.AUTO &&
                parentStyle.position == isc.Canvas.RELATIVE) {
                
                
                if (continueDeductingBorders &&
                    isc.isA.String(parentStyle.borderLeftWidth) && 
                    parentStyle.borderLeftWidth.contains(px)        ) {
                        left -= parseInt(parentStyle.borderLeftWidth);
                }    
                
                
                if (hasSpecifiedSize) {
                
                    if (isc.isA.String(parentStyle.marginLeft) && 
                        parentStyle.marginLeft.contains(px)) 
                    {
                        var parentMarginLeft = parseInt(parentStyle.marginLeft);
                        if (parentMarginLeft > 0) left -= parentMarginLeft;
                    }                           
                
                    
                    if (currentParent.offsetParent != documentBody) {
                        
                        var superPadding = currentParent.offsetParent.currentStyle.padding;
                        if (isc.isA.String(superPadding) && superPadding.contains(px)) {
                            left -= parseInt(superPadding);
                        }
                    } else {    
                        
                        left -= (documentBody.leftMargin ? parseInt(documentBody.leftMargin) : 0);                
                    }
                } 
                
            } // end of if

            
            elementPosition = currentParent.style.position;
            currentParent = currentParent.offsetParent;
            if (currentParent != document.body) {
                parentStyle = currentParent.currentStyle;
            }
            
        }   // End of while loop
        
    }        
    
    // Workarounds for Safari
    if (isc.Browser.isSafari && isc.Browser.safariVersion < 525.271) {
        // In some versions of Safari, if the offsetParent has a border, the offsetLeft / top
        // reported is relative to the outside of that border, rather than the inside, so deduct
        // that value
        // No longer the case in Safari 3.2.1 (525.27.1)
        if (element.offsetParent != null && element.offsetParent != documentBody) {
            var parentBorder = 
                this.ns.Element.getComputedStyle(element.offsetParent, ["borderLeftWidth"]).borderLeftWidth;
            if (parentBorder != null) parentBorder = parseInt(parentBorder);
            if (isc.isA.Number(parentBorder)) left -= parentBorder;
        }

    } else if (isc.Browser.isOpera && isc.Browser.version >= 12 && element.offsetParent) {
        if (element.offsetParent.id.endsWith("_clipDiv")) {
            var parentBCR = element.offsetParent.getBoundingClientRect(),
                bcr = element.getBoundingClientRect();
            left = bcr.left - parentBCR.left;
        }
    }

    // --- cacheing code:
    // Cache the calculated and reported value, by saving it as attributes on the DOM element
    element._cachedReportedOffsetLeft = element.offsetLeft;
    element._cachedCalculatedOffsetLeft = left;
    
    return left;
},

// Element.getOffsetTop()
//  Takes 'element' 
//  element should be a pointer to a DOM element or the ID for a DOM element (doesn't 
//  handle getting a widget ID - in that case use widget.getOffsetTop() instead)
//  Returns the true offsetTop - the absolute top coordinate with respect to (the inside of any
//  border of) whatever is reported by the DOM as the offsetParent of the element.

getOffsetTop : function (element) {
    // In theory the value element.offsetTop should be what we want here. However it is
    // unreliable in a number of ways.
    if (element == null) {
        this.logWarn("getOffsetTop: passed null element");
        return 0;
    }
    
    // IE and Moz both return somewhat unreliable values for element.offsetTop by default.
    // Paper over these bugs and differences.
    var top = element.offsetTop;  // This is what we'd return if the browsers worked correctly!

    
    if (isc.Browser.isFirefox && isc.Browser.isStrict && top < 0) {
        var parent = element.offsetParent;
        if (parent != null) {
            if (parent.getBoundingClientRect().top ==
                element.getBoundingClientRect().top) top = 0;
        }
    }

    // --- caching code:
    // If we've already calculated a value (based on a reported offsetTop value), and
    // the reported value has not changed, return the previously calculated value.
    if (element._cachedReportedOffsetTop == top) {
       return element._cachedCalculatedOffsetTop;
    } else {
        // debug message for sanity checking coordinate caching
        //this.logWarn(element.getAttribute("eventProxy") + ": new DOM value for offsetTop");
    }

    // The reported offsetTop is the offset from the element, INSIDE of margins to the
    // offsetParent - if we have a top margin we should subtract it to get the position OUTSIDE
    // the margins.
    // Exception: If the margin is negative, we don't need to adjust for it. In this case the
    // reported offset is still to the outside of the element, even though the element is 
    // essentially shifted above where it would normally appear.
    
    var topMargin = parseInt(isc.Element.getComputedStyleAttribute(element, "marginTop"));
    if (isc.isA.Number(topMargin) && topMargin > 0) {
        top -= topMargin;
    }
    
    var documentBody = this.getDocumentBody(),
        parentStyle,
        px = "px",
        elementPosition = element.style.position;

    // Workarounds for Moz        
    if (isc.Browser.isMoz && isc.Browser.version >= 58) {
        
        
        
        if (element.offsetParent == null) return top;
        if (element.offsetParent != documentBody) {

            // get the offsetParent's style info
            parentStyle = this.ns.Element.getComputedStyle(element.offsetParent,
                                                           ["borderTopWidth"]);
            
            if (element.offsetParent.style[this._boxSizingStyleName] === "border-box") {
                top -= (isc.isA.Number(parseInt(parentStyle.borderTopWidth)) ?
                                       parseInt(parentStyle.borderTopWidth) : 0);
            }
        }
    }
    
    // Workarounds for IE
    // IE8 Strict mode (HTML4 strict doctype or HTML5 doctype) - includes parents' border
    // in reported offsetLeft/offsetTop
    if (isc.Browser.isIE8Strict && !isc.Browser.isIE9) {
        var currentParent = element.offsetParent,
            parentStyle = currentParent ? currentParent.currentStyle : null,
            borderTopWidth = parentStyle ? parentStyle.borderTopWidth : null;
        if (isc.isA.String(borderTopWidth) && borderTopWidth.contains(px)) {
            top -= parseInt(borderTopWidth);
        }
    
    
    } else if (isc.Browser.isIE && !isc.Browser.isIE9) {
        
        if (element.offsetParent && element.offsetParent != documentBody) {

            parentStyle = element.offsetParent.currentStyle;  
            
            
            if (    parentStyle.position == isc.Canvas.RELATIVE &&  
                    parentStyle.height == isc.Canvas.AUTO && 
                    parentStyle.width == isc.Canvas.AUTO &&  
                    isc.isA.String(parentStyle.borderTopWidth) && 
                    parentStyle.borderTopWidth.contains(px)         ) {
                        top -= parseInt(parentStyle.borderTopWidth);
            }
        }
    }    
    
    // Workarounds for Safari
    if (isc.Browser.isSafari && isc.Browser.safariVersion < 525.271) {
        // As noted in 'getOffsetLeft()', in Safari the width of the parent's border is included
        // in the offsetLeft/top value reported.
        if (element.offsetParent && element.offsetParent != documentBody) {
            var parentBorder = 
                this.ns.Element.getComputedStyle(element.offsetParent, 
                                                ["borderTopWidth"]).borderTopWidth;
            
            if (parentBorder != null) parentBorder = parseInt(parentBorder);
            if (isc.isA.Number(parentBorder)) top -= parentBorder;
        }

    } else if (isc.Browser.isOpera && isc.Browser.version >= 12 && element.offsetParent) {
        if (element.offsetParent.id.endsWith("_clipDiv")) {
            var parentBCR = element.offsetParent.getBoundingClientRect(),
                bcr = element.getBoundingClientRect();
            top = bcr.top - parentBCR.top;
        }
    }

    // --- cacheing code:
    // Cache the calculated and reported value, by saving it as attributes on the DOM element
    element._cachedReportedOffsetTop = element.offsetTop;
    element._cachedCalculatedOffsetTop = top;
   
    return top;

},

// getLeftOffset(element, targetElement, rtl)
//
// DOM Only method to return the absolute (offset) position for some element within some other 
// DOM parent element.  We will return this value from the outside of any border / margin on
// the child to the inside of the ancestor element.
//

getLeftOffset : function (element, targetElement, rtl, canvasArgs) {
    return this.getOffset(isc.Canvas.LEFT, element, targetElement, rtl, canvasArgs);
},

// Return the absolute position of an element within a DOM parent element.
// If no target parent element is passed, we return page level position.
getTopOffset : function (element, targetElement, canvasArgs) {
    return this.getOffset(isc.Canvas.TOP, element, targetElement, null, canvasArgs);
},


_$borderLeftWidth: "borderLeftWidth",
_$borderTopWidth: "borderTopWidth",
_$marginLeft: "marginLeft",
_$marginTop: "marginTop",
_$none:"none",



_$leftCoords: "_$leftCoords",
_$topCoords: "_$topCoords",

_$BODY: "BODY",
_$HTML: "HTML",
_isDocElemBCROkay: !isc.Browser.isIE && !isc.Browser.isOpera,
getBoundingClientRect : (isc.Browser.isIPhone ?
    function (element) {
        // Use the default getBoundingClientRect() because the native implementation handles the
        // page scale exactly.
        return element.getBoundingClientRect();
    }
: // !isc.Browser.isIPhone
    function (element) {
        
        var isDocElemBCROkay = this._isDocElemBCROkay,
            isIEQuirks = isc.Browser.isIE && !isc.Browser.isStrict;
        if (element.tagName == this._$BODY ||
            (!isDocElemBCROkay && element.tagName == this._$HTML))
        {
            var doc = element.ownerDocument,
                docElem = doc.documentElement,
                win = doc.defaultView || window;
            if (isDocElemBCROkay) {
                return docElem.getBoundingClientRect();
            } else if (isIEQuirks && isc.Browser.version == 6) {
                
                var bcr = element.getBoundingClientRect(),
                    left = -doc.body.scrollLeft + (docElem.clientLeft || 0),
                    top = -doc.body.scrollTop + (docElem.clientTop || 0),
                    width = Math.max(docElem.offsetWidth, bcr.right),
                    height = Math.max(docElem.offsetHeight, bcr.bottom);
                return {
                    left: left,
                    top: top,
                    right: left + width,
                    bottom: top + height,
                    width: width,
                    height: height
                };
            } else {
                var bcr = element.getBoundingClientRect(),
                    
                    width = Math.max(docElem.clientWidth, bcr.right),
                    height = Math.max(docElem.clientHeight, bcr.bottom),
                    left = docElem.clientLeft || 0,
                    top = docElem.clientTop || 0;
                if (isIEQuirks) {
                    left -= doc.body.scrollLeft;
                    top -= doc.body.scrollTop;
                } else {
                    left -= win.pageXOffset || docElem.scrollLeft;
                    top -= win.pageYOffset || docElem.scrollTop;
                }
                return {
                    left: left,
                    top: top,
                    right: left + width,
                    bottom: top + height,
                    width: width,
                    height: height
                };
            }
        } else if (isIEQuirks && isc.Browser.version == 6) {
            
            var bcr = element.getBoundingClientRect();
            return {
                left: bcr.left,
                top: bcr.top,
                right: bcr.right,
                bottom: bcr.bottom,
                width: bcr.right - bcr.left,
                height: bcr.bottom - bcr.top
            };
        } else {
            return element.getBoundingClientRect();
        }
    }
),

//> @object ElementOffsets
//<
//> @attr elementOffsets.left (double : : R)
//<
//> @attr elementOffsets.top (double : : R)
//<

// cacheOffestCoordinates: If set we will cache calculated offsets between SmartClient
// ancestor/descendent components.
// This improves performance on repeated lookups during (EG) drag/drop, etc

cacheOffsetCoords:true,

//> @classMethod element.getOffsets() [A]
// @param (DOMElement or Canvas) sourceElement
// @param (DOMElement or Canvas) origTargetElement
// @param (Boolean) rtl
// @return (ElementOffsets)
//<
getOffsets : function (sourceElement, origTargetElement, rtl, canvasArgs) {
    var sourceIsCanvas = canvasArgs || isc.isA.Canvas(sourceElement),
        targetIsCanvas = canvasArgs || origTargetElement == null || isc.isA.Canvas(origTargetElement);

    var cacheCoords = sourceIsCanvas && targetIsCanvas && this.cacheOffsetCoords && 
                      (sourceElement.cacheOffsetCoords != false),
        targetID = origTargetElement ? origTargetElement.ID : this._$none;
    if (cacheCoords && sourceElement[this._$leftCoords] != null &&
        sourceElement[this._$topCoords] != null)
    {
        var cachedLeftCoord = sourceElement[this._$leftCoords][targetID],
            cachedTopCoord = sourceElement[this._$topCoords][targetID];
        if (cachedLeftCoord != null && cachedTopCoord != null) {
            
            return {
                left: cachedLeftCoord,
                top: cachedTopCoord
            };
        }
    }
    

    var element = sourceIsCanvas ? sourceElement.getClipHandle() : sourceElement;
    var targetElement;

    // if we're not passed an element, determine the offset from the top level HTML element.
    if (origTargetElement == null) targetElement = this.getDocumentBody();
    
    else if (targetIsCanvas) targetElement = origTargetElement.getHandle();
    else targetElement = origTargetElement;

    //!DONTCOMBINE
    //>DEBUG
    if (targetElement == null || element == null) {
        
        return {
            left: 0,
            top: 0
        };
    }
    //<DEBUG

    var offsets;

    if (isc.Browser._hasGetBCR) {
        
        var elementBCR = this.getBoundingClientRect(element),
            targetElementBCR = this.getBoundingClientRect(targetElement);
        
        offsets = {
            left: (elementBCR["left"] - targetElementBCR["left"]) << 0,
            top: (elementBCR["top"] - targetElementBCR["top"]) << 0
        };
    } else {
        var nextParent = element.offsetParent;

        
        if (isc.Browser.isMoz && nextParent == null) return 0;


        // To get the offsetLeft / Top with respect to the passed in targetElement,
        // iterate through the offsetParents, summing 'offsetLeft' until we reach the targetElement.
        // If we reach the targetElement's offsetParent before we hit the targetElement we've jumped
        // over the target - this is Ok - just deduct the offsetLeft of the targetElement to adjust
        // for it.
        // For each iteration adjust for scrolling and border / margin thickness
        // (see comments in the while loop below).
        var targetParent = targetElement.offsetParent,
            currentNode = element;

        offsets = {
            left: 0,
            top: 0
        };

        if (rtl == null) rtl = isc.Page.isRTL();

        // iterate up until we reach the targetElement, or the targetElement's offsetParent
        // We could also check for documentBody to avoid crashing in the case where we were
        // passed bad params.
        var iterations = 0;
        while (nextParent != targetElement && nextParent != targetParent) {

            this._adjustOffsets(offsets, currentNode, nextParent, rtl);

            // Move up the DOM chain
            currentNode = nextParent;
            nextParent = currentNode.offsetParent;
            iterations++;
        }

        // At this point the nextParent is either the target or its offsetParent.
        this._adjustOffsets(offsets, currentNode, nextParent, rtl);

        // OffsetLeft from the last iteration was relative to the target's offsetParent -
        // deduct the target's offsetLeft to get the offset relative to the target instead.
        if (nextParent == targetParent) {
            // deduct the targetElement's offsetLeft
            // No need to adjust for border / padding in this case
            offsets.left -= this.getOffsetLeft(targetElement);
            offsets.top -= this.getOffsetTop(targetElement);
        }

        
    }

    if (cacheCoords) {
        var coordCache = sourceElement[this._$leftCoords] = sourceElement[this._$leftCoords] || {};
        coordCache[targetID] = offsets.left;
        coordCache = sourceElement[this._$topCoords] = sourceElement[this._$topCoords] || {};
        coordCache[targetID] = offsets.top;
    }

    return offsets;
},

_adjustOffsets : function (offsets, currentNode, nextParent, rtl) {
    // Add the currentNode's offsetLeft/top - left w.r.t. its offsetParent
    offsets.left += this.getOffsetLeft(currentNode);
    offsets.top += this.getOffsetTop(currentNode);

    // The offsetLeft/top value is relative to the content of the parent's element - so if
    // the parent is scrolled, and we want the floating position of this element within
    // its parent we have to deduct the scrollLeft of the parent to page coordinate
    // relative to the parent's element's top/left
    if (!rtl) {
        // deduct the scrollLeft
        offsets.left -= nextParent.scrollLeft || 0;
    } else {
        // rtl var is only ever true when calculating left offset.
        
        

        var scrollLeft = nextParent.scrollLeft;
        if (isc.isA.Number(scrollLeft)) {
            var overflow = nextParent.style ? nextParent.style.overflow : isc.emptyString;
            if (overflow != isc.Canvas.VISIBLE && overflow != isc.emptyString) {
                var nativeScrollNegativeOrigin = this._nativeScrollNegativeOrigin,
                    nativeScrollInverse = this._nativeScrollInverse;

                // inverse - we can just flip the polarity of the reported scrollLeft to give
                // negative origin.
                if (nativeScrollInverse) {
                    scrollLeft = -scrollLeft;
                    nativeScrollNegativeOrigin = true;

                }
                // convert negative origin to zero origin (so zero = scrolled hard left)
                if (!nativeScrollNegativeOrigin) {
                    scrollLeft = isc.Canvas._adjustScrollLeftForRTL(
                                    scrollLeft, nextParent.scrollWidth,
                                    nextParent.clientWidth,
                                    // param indicates we're currently in zero origin coords and
                                    // want to move to negative origin
                                    true, true);
                }

                offsets.left -= scrollLeft;
            }
        }
    }

    offsets.top -= nextParent.scrollTop || 0;

    

    // add the border / margin thickness, because when we add the parent's offsetLeft
    // this will be the distance from the OUTSIDE of this element's border/margin
    // to the inside of the next parent's element.
    // Note: Skip this if the margin is negative as in this case the value we have from
    // getOffsetTop() / Left() is actually relative to the outside of the element
    var styleObj, borderLeftWidth, borderTopWidth, marginLeft, marginTop;
    if (this._useCurrentStyle) {
        
        styleObj = nextParent.currentStyle;

        
        if (!isc.Browser.isOpera || styleObj.borderLeftStyle != this._$none) {
            borderLeftWidth = parseInt(styleObj.borderLeftWidth);
            if (borderLeftWidth > 0) offsets.left += borderLeftWidth;
        }
        if (!isc.Browser.isOpera || styleObj.borderTopStyle != this._$none) {
            borderTopWidth = parseInt(styleObj.borderTopWidth);
            if (borderTopWidth > 0) offsets.top += borderTopWidth;
        }

        
        marginLeft = parseInt(styleObj.marginLeft);
        if (marginLeft > 0) offsets.left += marginLeft;
        marginTop = parseInt(styleObj.marginTop);
        if (marginTop > 0) offsets.left += marginLeft;
    } else if (isc.Browser.isMoz) {
        
        styleObj = window.getComputedStyle(nextParent, null);

        offsets.left += parseInt(styleObj.borderLeftWidth);
        offsets.top += parseInt(styleObj.borderTopWidth);

        marginLeft = parseInt(styleObj.marginLeft);
        if (marginLeft > 0) offsets.left += marginLeft;
        marginTop = parseInt(styleObj.marginTop);
        if (marginTop > 0) offsets.top += marginTop;
    } else {
        borderLeftWidth = parseInt(this.getComputedStyleAttribute(nextParent,
                                                                  this._$borderLeftWidth));
        if (borderLeftWidth > 0) offsets.left += borderLeftWidth;
        borderTopWidth = parseInt(this.getComputedStyleAttribute(nextParent,
                                                                 this._$borderTopWidth));
        if (borderTopWidth > 0) offsets.top += borderTopWidth;

        marginLeft = parseInt(this.getComputedStyleAttribute(nextParent,
                                                             this._$marginLeft));
        if (marginLeft > 0) offsets.left += marginLeft;
        marginTop = parseInt(this.getComputedStyleAttribute(nextParent,
                                                            this._$marginTop));
        if (marginTop > 0) offsets.top += marginTop;
    }
},


getOffset : function (dir, sourceElement, origTargetElement, rtl, canvasArgs) {
    var offsets = this.getOffsets(sourceElement, origTargetElement, rtl, canvasArgs);
    return offsets[dir];
},

// one-time flags for RTL mode coordinate calculations
_nativeScrollNegativeOrigin:(isc.Browser.isMoz || (isc.Browser.isIE && isc.Browser.minorVersion < 5.5)),
_nativeScrollInverse:(isc.Browser.isIE9 && isc.Browser.isStrict),



// ----------------------------------------------------------------------------------------
// CSS / Styling Lookups
// ----------------------------------------------------------------------------------------
// Retrieval of CSS style declaration and computed styles

// Styling: what we need and why:
// We need to be able to look up border, padding and margin sizes in order to:
// - compensate for errors in reported offsetLeft / offsetTop to have correct page-level
//   coordinates when relatively positioned (needed for arbitrary containing elements not
//   created by ISC)
// - when using the CSS standard box model, be able to write HTML that will render with
//   predictable sizes even when using author-specified CSS styling.  This is critical for grid
//   cell rendering, where correcting sizes after draw is not even close to feasible.
// - get correct scrollHeight when allowing natively positioned children



// cache of CSS style objects
_styleCache:{},
// get the edge widths (border, margin, padding) for a CSS style
getStyleEdges : function (className) {
    
    if (isc.Browser.isSafari && !isc.Element._safariStrictChecked) {
        isc.Browser.isStrict = isc.Element._testForSafariStrictMode();
        isc.Element._safariStrictChecked = true;
    }
    

    if (className == null) return null;

    // check whether cache value is defined, so we can cache failed lookups as nulls
    var undef;
    if (this._styleCache[className] !== undef) return this._styleCache[className];

    //this.logWarn("style lookup: " + className + this.getStackTrace());

    
    var cantDeriveStyles = (isc.Browser.isMoz && isc.Browser.geckoVersion < 20040616),
        styleInfo;
    
    if (cantDeriveStyles) {
        styleInfo = this.getStyleDeclaration(className);
    } else {
        
        var mask = isc.Browser.isIE ? this._styleEdgeMaskArray : this._styleEdgeMask;
        styleInfo = this._deriveStyleProperties(className, mask);
    }

    
    this._styleCache[className] = styleInfo;
    return styleInfo;
},

// In Safari, document.compatMode is not available, so we rely on the fact that 
// table cells render their padding outside their specified height in strict mode but not in
// normal compat mode to determine whether we're currently in strict mode
_testForSafariStrictMode : function () {
    if (document.compatMode != null) {
        
        return document.compatMode == "CSS1Compat";
    }
    
    var tableHTML = "<TABLE cellspacing=0 cellpadding=2 border=0><tr><td height=30>x</td></tr></TABLE>"
    
    var tester = isc.Element.createAbsoluteElement(tableHTML);
    
    var isStrict = tester.offsetHeight > 30;
    isc.Element.clear(tester);
    
    return isStrict;
},
  
// get certain key properties of a style by applying it to an element and inspecting that
// element.  Edge-related properties are reliably derivable this way, cssText is known not
// available, other properties would need testing.

_deriveStyleProperties : function (className, mask) {
    
    var requiresDivTester = (isc.Browser.isIE || isc.Browser.isOpera || isc.Browser.isSafari
                                || (isc.Browser.isMoz && isc.Browser.geckoVersion >=20080205));
    if (!this._cellStyleTester) {
        
        this.createAbsoluteElement(
            "<TABLE CELLPADDING=81 STYLE='position:absolute;left:0px;top:-2000px;'><TR><TD " +
            
            //(isc.Browser.isSafari ? "style='position:absolute;left:0px;top:0px;' " : "") +
            (isc.Browser.isIE8Strict ? 
            " ID=isc_cellStyleTester STYLE='border:0px;margin:0px'><DIV ID=isc_cellInnerStyleTester>" +
                isc.Canvas.blankImgHTML(30,30) + "</DIV></TD>"                
            :
            " ID='isc_cellStyleTester'>&nbsp;</TD><TD ID='isc_cellNoStyleTester'>&nbsp;</TD>"
            ) +
            "</TR></TABLE>"
        );
        this._cellStyleTester = isc.Element.get("isc_cellStyleTester");
        if (isc.Browser.isIE8Strict) {
            this._cellInnerStyleTester = isc.Element.get("isc_cellInnerStyleTester");
        }
        // we set the table cellPadding to 81px - this will then be reported back
        // if the padding on the style was unset (allows us to differentiate between
        // null and explicit zero)
        
        this._$81px = "81px";
        if (isc.Browser.isSafari || isc.Browser.isChrome) {
            var noStyleElement = isc.Element.get("isc_cellNoStyleTester");
            var paddingLeft = ["paddingLeft"];
            var reported81 = this.getComputedStyle(noStyleElement, paddingLeft).paddingLeft;
            if (reported81 != this._$81px) {
                this.logDebug("Browser natively misreporting cell-padding (81px reported as:"
                        + reported81 + "). This behavior is known to occur when the view is " +
                        "zoomed in certain browsers but is worked around by SmartClient and " +
                        "should have no visible effect on the application.", "sizing");
                this._$81px = reported81;
            }
        }
        this._$16384px = "-16384px";       

        if (requiresDivTester) {
            this.createAbsoluteElement(
                "<DIV ID=isc_styleTester STYLE='position:absolute;left:0px;top:-2000px;'>&nbsp;</DIV>"
            );
            this._styleTester = isc.Element.get("isc_styleTester");
            this._marginMask = ["marginLeft", "marginTop", "marginRight", "marginBottom"];
            if (isc.Browser.isIE8Strict) {
                this._marginMask.addList(["borderLeftWidth", "borderTopWidth", 
                                          "borderRightWidth", "borderBottomWidth"]);
            }
        }
    }

    this._cellStyleTester.className = className;
    var style = this.getComputedStyle(this._cellStyleTester, mask);

    //this.logWarn(className + " style is: " + this.echo(style));

    // test for unset padding 
    var nullIndicator = this._$81px;
    if (style.paddingLeft == nullIndicator) style.paddingLeft = null;
    if (style.paddingTop == nullIndicator) style.paddingTop = null;
    if (style.paddingRight == nullIndicator) style.paddingRight = null;
    if (style.paddingBottom == nullIndicator) style.paddingBottom = null;

    if (isc.Browser.isIE8Strict) {
        var innerTester = this._cellInnerStyleTester,
            offsetLeft = innerTester.offsetLeft,
            offsetTop = innerTester.offsetTop;
        
        if (offsetLeft == 81) style.paddingLeft = null;
        if (offsetTop == 81) style.paddingTop = null;
        if (this._cellStyleTester.offsetWidth - offsetLeft - 30 == 81) {
            style.paddingRight = null;
        }
        if (this._cellStyleTester.offsetHeight - offsetTop - 30 == 81) {
            style.paddingBottom = null;
        }
    }

    if (isc.Browser.isSafari) {
        // older Safari versions report unset padding as "auto" instead of reporting the
        // cellPadding
        if (isc.Browser.safariVersion < 419.3) {
            nullIndicator = isc.Canvas.AUTO;
            if (style.paddingLeft == nullIndicator) style.paddingLeft = null;
            if (style.paddingTop == nullIndicator) style.paddingTop = null;
            if (style.paddingRight == nullIndicator) style.paddingRight = null;
            if (style.paddingBottom == nullIndicator) style.paddingBottom = null;
        }

        // serious bug introduced in Safari 419.3 / 2.0.4, aka Tiger update 10.4.7: unset
        // marginTop/Bottom on cells reported as "-16384px".  Chimp factor 9.89
        nullIndicator = this._$16384px;        
        if (style.marginTop == nullIndicator) style.marginTop = null;
        if (style.marginBottom == nullIndicator) style.marginBottom = null;
    }


    
    if (requiresDivTester) {
        this._styleTester.className = className;
        var results = this.getComputedStyle(this._styleTester, this._marginMask);
        style.marginLeft = results.marginLeft;
        style.marginRight = results.marginRight;
        style.marginTop = results.marginTop;
        style.marginBottom = results.marginBottom;
        if (isc.Browser.isIE8Strict) {
            style.borderLeftWidth = results.borderLeftWidth;
            style.borderRightWidth = results.borderRightWidth;
            style.borderTopWidth = results.borderTopWidth;
            style.borderBottomWidth = results.borderBottomWidth;
        }
    }
    return style;

},

//> @classMethod Element.getComputedStyle()
//  Returns an object containing the current (computed) style for a DOM element.  This object 
//  includes all the attributes set directly on the element's style property, and those inherited
//  from the element's CSS class.
//  @param  ID  (string | object)   element, or ID of the element
//  @param  mask    (array)         list of propertyNames to include in the returned object
//  @return (object)    object containing computed style attributes.
//<
getComputedStyle : function (ID, mask) {
    
    var element, style, styleInfo;
    
    if (isc.isA.String(ID)) {
        element = isc.Element.get(ID);
    } else {
        // Otherwise just assume the DOM element was passed in directly
        element = ID;
    }

    if (element == null || !isc.isAn.Object(element)) {
        //>DEBUG
        this.logWarn("getComputedStyle: Unable to get to DOM element specified by '" + ID + "'." + this.getStackTrace());
        //<DEBUG
        return null;
    }
    
    if (this._useCurrentStyle) {
        
        style = element.currentStyle;
        // NOTE: use Array form of mask, faster with applyMask
        if (mask == null) mask = this._styleFullMaskArray;
        var results = isc.applyMask(style, mask);
        return results;
    } 

    // prepare a mask from camelCaps property to CSS dashed-property-name, because we want to
    // return camelCaps'd values but native getPropertyValue() uses dashed versions
    if (mask == null) { 
        // retrieve all properties
        mask = this._styleFullMask;
    } else if (isc.isAn.Array(mask)) {
        // if we have an explicit list of properties to retrieve, build a mask of camelCaps
        // name to CSS standard name (dash-separated) for just the desired properties.
        var obj = {},
            fullMask = this._styleFullMask;
        for (var i = 0; i < mask.length; i++) {
            obj[mask[i]] = fullMask[mask[i]];
        }
        mask = obj;
    }
    
    
    var safariPre13 = isc.Browser.isSafari && isc.Browser.safariVersion < 312,
        classStyleObject;
    if (safariPre13) {
        style = element.style;
        classStyleObject = this.getStyleDeclaration(element.className);

        styleInfo = {};
        for (var property in mask) {
            styleInfo[property] = style.getPropertyValue(mask[property]);
            
            if (styleInfo[property] == null &&
                classStyleObject != null && classStyleObject[property] != null &&
                !isc.isAn.emptyString(classStyleObject[property])) 
            { 
                
                styleInfo[property] = classStyleObject[property];
            }
        }
    } else {
        if (document.defaultView && document.defaultView.getComputedStyle) {
        style = document.defaultView.getComputedStyle(element, null);

        }
        if (style == null) {
            style = {};
            this.logWarn("getComputedStyle() not natively available - can't " +
                "guarantee accurate styling information for element:" + this.echoLeaf(element));
            if (this.logIsDebugEnabled()) {
                this.logDebug(this.getStackTrace());
            }
        }
        styleInfo = {};
        for (var property in mask) {
            styleInfo[property] = style[property];
        }
    }

    //this.logWarn("styleInfo for style: " + className + " is: " + this.echo(styleInfo));
    return styleInfo;
    
},

// return an individual attribute from the computed style.  Quicker than getting the full set
// of properties if you need only one.

_$operaBorderStyles:{
    border:"borderStyle", 
    borderWidth:"borderStyle", 
    borderLeft:"borderLeftStyle", 
    borderRight:"borderRightStyle", 
    borderTop:"borderTopStyle", 
    borderBottom:"borderBottomStyle",
    borderLeftWidth:"borderLeftStyle", 
    borderRightWidth:"borderRightStyle", 
    borderBottomWidth:"borderBottomStyle", 
    borderTopWidth:"borderTopStyle"
},
getComputedStyleAttribute : function (element, property) {

    if (element == null || property == null) return null;
    
    // Use currentStyle for IE (easy!)
    if (this._useCurrentStyle) {

        // we've seen element.currentStyle be reported as null (not sure why)
        if (element.currentStyle == null) return null;
        // special opera logic for undefined borders returning 3
        if (isc.Browser.isOpera && this._$operaBorderStyles[property] != null &&
            element.currentStyle[this._$operaBorderStyles[property]] == this._$none) return 0;
        return element.currentStyle[property];
    }

    //>Safari
    if (isc.Browser.isSafari && isc.Browser.version < 5) {
        
        var propertyValue = null;
        if (element.style) propertyValue = element.style[property];
        if ((propertyValue == null || isc.isAn.emptyString(propertyValue)) &&
            element.className)
        {
            var styleDecl = isc.Element.getStyleEdges(element.className);
            if (styleDecl) propertyValue = styleDecl[property];
        }
        if (isc.isAn.emptyString(propertyValue)) return null;
        return propertyValue;            
    } //<Safari
    
    // DOM and not broken (eg Moz).  Convert camelCaps to the CSS property name (only works for
    // a specific list of props)
    var mask = this._styleFullMask;
        
    var docView = this._docView = this._docView || document.defaultView;

    var cssProperty = (mask[property] || property),
        // get the style object for the element
        style = docView.getComputedStyle(element, null);
        
       
    return style.getPropertyValue(cssProperty);
},


_nonnativeRangeGetBoundingClientRectImpl : function (handle) {
    var handleBCR = handle.getBoundingClientRect();

    var top = handleBCR.top + isc.Element.getTopBorderSize(handle);
    var left = handleBCR.left + isc.Element.getLeftBorderSize(handle);

    // Create a new object because the attributes of a `ClientRect' object are read-only.
    // http://www.w3.org/TR/cssom-view/#the-clientrect-interface
    // We start with an empty rect.
    handleBCR = {
        top: top,
        right: left,
        bottom: top,
        left: left
    };

    // `textRange' is used to calculate the bounding client rect of text nodes.
    var textRange = null;

    if (handle.firstChild) {
        // If the first or last child node is a BR element, insert a temporary &nbsp;.
        // These nbsps are removed at the end.
        var beginTempNbspChild = null,
            endTempNbspChild = null;
        if (handle.firstChild.tagName == "BR") {
            handle.insertAdjacentHTML("afterbegin", "&nbsp;");
            beginTempNbspChild = handle.firstChild;
        }
        if (handle.lastChild.tagName == "BR" &&
            ((beginTempNbspChild != null && handle.firstChild.nextSibling != handle.lastChild) ||
             (beginTempNbspChild == null && handle.firstChild != handle.lastChild)))
        {
            handle.insertAdjacentHTML("beforeend", "&nbsp;");
            endTempNbspChild = handle.lastChild;
        }

        try {
            var childNodes = handle.childNodes,
                childNodes_length = childNodes.length;
            for (var i = 0; i < childNodes_length; ++i) {
                var child = childNodes[i];
                var bcr;
                if (child.nodeType == 1 /* ELEMENT_NODE */) {
                    bcr = child.getBoundingClientRect();

                    // If the bounding client rect of the element is an empty `ClientRect', discard it.
                    // This happens for BR elements in WebKit and Opera, as well as elements that are
                    // display:none.
                    if (bcr.top == 0 && bcr.left == 0 && bcr.width == 0 && bcr.height == 0) {
                        continue;
                    }

                    // Factor in the computed sizes of the child element's margins.
                    var topMargin = isc.Element.getTopMargin(child);
                    var rightMargin = isc.Element.getRightMargin(child);
                    var bottomMargin = isc.Element.getBottomMargin(child);
                    var leftMargin = isc.Element.getLeftMargin(child);
                    bcr.top -= topMargin;
                    bcr.right += rightMargin;
                    bcr.bottom += bottomMargin;
                    bcr.left -= leftMargin;
                    bcr.width += rightMargin + leftMargin;
                    bcr.height += topMargin + bottomMargin;
                } else {
                    if (textRange == null) textRange = handle.ownerDocument.createRange();
                    textRange.setStartBefore(child);
                    textRange.setEndAfter(child);
                    bcr = textRange.getBoundingClientRect();
                }

                handleBCR.top = Math.min(bcr.top, handleBCR.top);
                handleBCR.right = Math.max(handleBCR.right, bcr.right);
                handleBCR.bottom = Math.max(handleBCR.bottom, bcr.bottom);
                handleBCR.left = Math.min(bcr.left, handleBCR.left);
            }
        } finally {
            // Remove any temporarily-inserted &nbsp;.
            if (endTempNbspChild != null) {
                handle.removeChild(endTempNbspChild);
                endTempNbspChild = null;
            }
            if (beginTempNbspChild != null) {
                handle.removeChild(beginTempNbspChild);
                beginTempNbspChild = null;
            }
        }
    }

    handleBCR.width = handleBCR.right - handleBCR.left;
    handleBCR.height = handleBCR.bottom - handleBCR.top;

    return handleBCR;
},


_matchesSelector : function (element, selectorText) {
    
    try {
        if (isc.Browser.isIE9) return element.msMatchesSelector(selectorText);
        else if (isc.Browser.isChrome || isc.Browser.isWebKit) return element.webkitMatchesSelector(selectorText);
        else if (isc.Browser.isMoz) return element.mozMatchesSelector(selectorText);
        else if (isc.Browser.isOpera) return element.oMatchesSelector(selectorText);
    } catch (e) {
        
        return false;
    }

    // Incomplete fallback implementation for browsers that do not support the matches() DOM
    // method (formerly called matchesSelector()).
    

    

    if (isc.isAn.emptyString(element.className)) return false;
    var classNameSelector = "." + element.className,
        selectorTextArray = selectorText.split(/(?:,\s*)+/);
    for (var k = 0; k < selectorTextArray.length; k++) {
        if (selectorTextArray == classNameSelector) return true;
    }
    return false;
},



// look up a style declaration via document.stylesheets

//_defaultReferenceElement: null,
getStyleDeclaration : function (className, checkMultiples, referenceElement) {

    if (!className) return null;

    if (referenceElement == null) {
        referenceElement = this._defaultReferenceElement;
        if (referenceElement == null) {
            
            referenceElement = this._defaultReferenceElement = document.createElement("div");
            referenceElement.id = "isc_getStyleDeclaration_defaultReferenceElement";
            referenceElement.style.display = "none";
            document.body.appendChild(referenceElement);
        }
        referenceElement.className = className;
    } 

    
    if (!isc.allowDuplicateStyles) checkMultiples = false;

    

    // Check the array of style rules from any styleSheets 
    // - This will include <STYLE> tags in the doc
    // - Start with the most recently loaded
    var styleObj, styleObjs = checkMultiples ? [] : null;
    for (var i = document.styleSheets.length - 1; i >= 0; i--) {
        var rules = this._getCSSRules(document.styleSheets[i]);

        
        if (rules == null) continue; // stylesheet inaccessible

        // iterate backward through style declarations, since last wins
        for (var j = rules.length - 1; j >= 0; j--) {
            var selectorText = rules[j].selectorText;

            // @import css tags result in entries with no 'selectorText' property.            
            if (selectorText == null) continue;

            
            if (isc.Browser.isSafari && 530.17 > isc.Browser.safariVersion && isc.Browser.safariVersion >= 312) {
                selectorText += ", " + selectorText.toLowerCase()
            }

            if (this._matchesSelector(referenceElement, selectorText)) {
                var styleObj = rules[j].style;
                if (checkMultiples) styleObjs[styleObjs.length] = styleObj;
                else return styleObj;
            }
        }
    }
    if (checkMultiples && styleObjs.length > 0) return styleObjs;
    return null;
},

// retrieve the css rules property from a stylesheet definition
_getCSSRules : function (styleSheet) {
    
    if (!this._fetchStyle) {

        // "cssRules" in Moz, "rules" in IE.
        this._fetchStyle = function (sheet) {
            try {
                return sheet.rules || sheet.cssRules;
            } catch (e) {
                isc.Page._remoteStyleSheet = true;
            }
        };

    }
    return this._fetchStyle(styleSheet);
},





//>	@classMethod Element.getStyleText()	([A])
// Gets the raw CSS style text associated with a CSS className. For example, if you have
// defined the following class:<br><br>
// <code>.cellSelected {font-family:Verdana; font-size:10px; background-color:#FFFF99;<br>
// border-top:1px solid #FFFF99;<br>
// border-bottom:1px solid #FFFF99;<br>
// }</code><br><br>
// Then calling getStyleText("cellSelected") will return:<br><br>
// <code>font-family:Verdana; font-size:10px; background-color:#FFFF99;<br>
// border-top:1px solid #FFFF99; border-bottom:1px solid #FFFF99;</code>
//		@group	drawing
//
//      @param  className   (string)       The CSS ClassName for which you wish to get the style
//      @param  [checkMultiples]    (boolean)   If specified this will ensure we check for 
//                                          multiple definitions of the same className and pick
//                                          up cssText from each definition. False by default.
//                                          No effect if isc.allowDuplicateStyles is false.
//      @return (string)       The cssText property of this CSS style rule
//<
_cssTextCache:{},
_$semi:";",
getStyleText : function (className, checkMultiples) {

    
    if (!isc.allowDuplicateStyles) checkMultiples = false;
    

    
    
    // check cache.
    
    var cache = this._cssTextCache,
        cssText = cache[className];
    if (cssText != null) return cssText;

    var style = this.getStyleDeclaration(className, checkMultiples); 
    
    // if we didn't find anything, return the empty string (rather than null)
    if (style == null) {
        
        if (!isc.Browser.isSafari || isc.Page.isLoaded()) 
            this._cssTextCache[className] = isc.emptyString;
        return isc.emptyString;
    }

    // "style" will be an array if we checked multiple styles
    
    
    if (checkMultiples) {
        for (var i = style.length-1; i >-1; i--) {        
            var actualStyle = style[i];
            var currentCssText = actualStyle.cssText;
            if (currentCssText == null) continue;
            if (!isc.endsWith(currentCssText, this._$semi)) currentCssText += this._$semi;
            if (cssText == null) cssText = currentCssText;
            else cssText += currentCssText;
        }
        if (cssText == null) cssText = isc._emptyString;
    } else {
        cssText = (style.cssText || isc._emptyString);
    }
        
    // ensure it ends with a semicolon so it can be appended to
    if (!isc.endsWith(cssText, isc.semi)) cssText += isc.semi;
    // cache it and return it
    
    return (cache[className] = cssText);
},


// wipe out any cached CSS information
// helper for Canvas._clearCSSCaches
_clearCSSCaches : function () {
    //isc.Log.logWarn("styleCache is: " + isc.echoFull(isc.Element._styleCache));

    // wipe out the central style definition caches
    isc.Element._styleCache = {};
    isc.Element._cssTextCache = {};

    // wipe out central edge size caches
    isc.Element._borderSizeCache = isc.Element._marginsCache = 
        isc.Element._padSizeCache = null;
},

// Border, Padding and Margin on css classes
// --------------------------------------------------------------------------------------------
// We provide the static Element class methods to handle getting border and padding 
// thicknesses on each side ('getTopBorderSize()', 'getBottomBorderSize()', 'getTopPadding()',
// etc.) for css classes from their classNames.





//>	@classMethod	Element._getTopMargin()
// Get the size of the top margin for the style passed in.
//
//  @param  className   (string)    className to test for margin size
//  @return             (number)    size of top margin in pixels
//<
_getTopMargin : function (className) {
    return this._calculateMargins(className).top;
},

//>	@classMethod	Element._getBottomMargin()
// Get the size of the bottom margin for the style passed in.
//
//  @param  className   (string)    className to test for margin
//  @return             (number)    size of bottom margin in pixels
//<
_getBottomMargin : function (className) {
    return this._calculateMargins(className).bottom;
},

//>	@classMethod	Element._getLeftMargin()
// Get the size of the left margin for the style passed in.
//
//  @param  className   (string)    className to test for margin size
//  @return             (number)    size of left margin in pixels
//<
_getLeftMargin : function (className) {
    return this._calculateMargins(className).left;
},

//>	@classMethod	Element._getRightMargin()
// Get the size of the right margin for the style passed in.
//
//  @param  className   (string)    className to test for margin size
//  @return             (number)    size of right margin in pixels
//<
_getRightMargin : function (className) {
    return this._calculateMargins(className).right;
},

//>	@classMethod	Element._calculateMargins()
// Calculate the sizes of the margins on each side for the css class passed in.
//
//  @param  className   (string)    className to test for margin sizes
//  @return             (object)    Object with 'left', 'right', 'top', 'bottom' defined as the 
//                                  sizes of the margin on each side
//<
_calculateMargins : function (className) {

    if (this._marginsCache == null) this._marginsCache = {};
    else if (this._marginsCache[className] != null) {
        return this._marginsCache[className];
    }        
    var margins = {top:0, bottom:0, left:0, right:0},
        styleObject = isc.Element.getStyleEdges(className);

    if (styleObject == null) return margins;
    
    var topMarginString = styleObject.marginTop,
        bottomMarginString = styleObject.marginBottom,
        leftMarginString = styleObject.marginLeft,
        rightMarginString = styleObject.marginRight,
        pxString = isc.px;
    if (isc.isA.String(topMarginString) && isc.endsWith(topMarginString, pxString)) 
        margins.top = parseInt(topMarginString);

    if (isc.isA.String(bottomMarginString) && isc.endsWith(bottomMarginString, pxString)) 
        margins.bottom = parseInt(bottomMarginString);
        
    if (isc.isA.String(leftMarginString) && isc.endsWith(leftMarginString, pxString)) 
        margins.left = parseInt(leftMarginString);
        
    if (isc.isA.String(rightMarginString) && isc.endsWith(rightMarginString, pxString)) 
        margins.right = parseInt(rightMarginString);
        
    this._marginsCache[className] = margins;        

    return margins;

},

//>	@classMethod	Element._getTopBorderSize()
// Get the size of the top border for the style passed in.
//
//  @param  className   (string)    className to test for border size
//  @return             (number)    size of top border in pixels
//<
_getTopBorderSize : function (className) {
    return this._calculateBorderSize(className).top;
},

//>	@classMethod	Element._getBottomBorderSize()
// Get the size of the bottom border for the style passed in.
//
//  @param  className   (string)    className to test for border size
//  @return             (number)    size of bottom border in pixels
//<
_getBottomBorderSize : function (className) {
    return this._calculateBorderSize(className).bottom;
},

//>	@classMethod	Element._getLeftBorderSize()
// Get the size of the left border for the style passed in.
//
//  @param  className   (string)    className to test for border size
//  @return             (number)    size of left border in pixels
//<
_getLeftBorderSize : function (className) {
    return this._calculateBorderSize(className).left;
},

//>	@classMethod	Element._getRightBorderSize()
// Get the size of the right border for the style passed in.
//
//  @param  className   (string)    className to test for border size
//  @return             (number)    size of right border in pixels
//<
_getRightBorderSize : function (className) {
    return this._calculateBorderSize(className).right;
},

//>	@classMethod	Element._calculateBorderSize()
// Calculate the sizes of the borders on each side for the css class passed in.
//
//  @param  className   (string)    className to test for border sizes
//  @return             (object)    Object with 'left', 'right', 'top', 'bottom' defined as the 
//                                  sizes of the border on each side
//<
_calculateBorderSize : function (className) {

    if (this._borderSizeCache == null) this._borderSizeCache = {};
    else if (this._borderSizeCache[className] != null) {
        return this._borderSizeCache[className];
    }        

    var borderSize = {top:0, bottom:0, left:0, right:0},
        styleObject = isc.Element.getStyleEdges(className);

    if (styleObject == null) return borderSize;
    
    var topBorderString = styleObject.borderTopWidth,
        bottomBorderString = styleObject.borderBottomWidth,
        leftBorderString = styleObject.borderLeftWidth,
        rightBorderString = styleObject.borderRightWidth,
        pxString = isc.px;
        
    if (isc.isA.String(topBorderString) && isc.endsWith(topBorderString, pxString)) 
        borderSize.top = parseInt(topBorderString);

    if (isc.isA.String(bottomBorderString) && isc.endsWith(bottomBorderString, pxString)) 
        borderSize.bottom = parseInt(bottomBorderString);
        
    if (isc.isA.String(leftBorderString) && isc.endsWith(leftBorderString, pxString)) 
        borderSize.left = parseInt(leftBorderString);
        
    if (isc.isA.String(rightBorderString) && isc.endsWith(rightBorderString, pxString)) 
        borderSize.right = parseInt(rightBorderString);
    
    this._borderSizeCache[className] = borderSize;        

    return borderSize;

},

//>	@classMethod	Element._getVBorderSize()
// Get the total vertical border size for the style passed in. (Top border size + bottom border size)
//
//  @param  className   (string)    className to test for padding size
//  @return             (number)    total size of vertical (top and bottom) borders in pixels
//<
_getVBorderSize : function (className) {
    return this._getTopBorderSize(className) + this._getBottomBorderSize(className);
},

//>	@classMethod	Element._getHBorderSize()
// Get the total horizontal border size for the style passed in. 
// (Left border size + Right border size)
//
//  @param  className   (string)    className to test for padding size
//  @return             (number)    total size of horizontal (left and right) borders in pixels
//<
_getHBorderSize : function (className) {
    return this._getLeftBorderSize(className) + this._getRightBorderSize(className);
},

//>	@classMethod	Element._getTopPadding()
// Get the size of the top padding for the style passed in.
//
//  @param  className   (string)    className to test for padding size
//  @param  [explicit]  (boolean)   If no passed, when no padding was specified, return null
//                                  rather than true.
//  @return             (number)    size of top padding in pixels
//<
_getTopPadding : function (className, explicit) {
    var padding = this._calculatePadding(className);
    if (explicit && padding.nullTop) return null;
    return padding.top;
},

//>	@classMethod	Element._getBottomPadding()
// Get the size of the bottom padding for the style passed in.
//
//  @param  className   (string)    className to test for padding size
//  @param  [explicit]  (boolean)   If passed, when no padding was specified, return null
//                                  rather than true.
//  @return             (number)    size of bottom padding in pixels
//<
_getBottomPadding : function (className, explicit) {
    var padding = this._calculatePadding(className);
    if (explicit && padding.nullBottom) return null;
    return padding.bottom;
},

//>	@classMethod	Element._getLeftPadding()
// Get the size of the left padding for the style passed in.
//
//  @param  className   (string)    className to test for padding size
//  @param  [explicit]  (boolean)   If passed, when no padding was specified, return null
//                                  rather than true.
//  @return             (number)    size of left padding in pixels
//<
_getLeftPadding : function (className, explicit) {
    var padding = this._calculatePadding(className);
    if (explicit && padding.nullLeft) return null;
    return padding.left;
},

//>	@classMethod	Element._getRightPadding()
// Get the size of the right padding for the style passed in.
//
//  @param  className   (string)    className to test for padding size
//  @param  [explicit]  (boolean)   If passed, when no padding was specified, return null
//                                  rather than true.
//  @return             (number)    size of right padding in pixels
//<
_getRightPadding : function (className, explicit) {
    var padding = this._calculatePadding(className);
    if (explicit && padding.nullRight) return null;
    return padding.right;
},

//>	@classMethod	Element._calculatePadding()
// Calculate the sizes of the padding on each side for the css class passed in.
//
//  @param  className   (string)    className to test for padding sizes
//  @return             (object)    Object with 'left', 'right', 'top', 'bottom' defined as the 
//                                  sizes of the padding on each side
//<
_calculatePadding : function (className) {
    if (this._padSizeCache == null) this._padSizeCache = {};
    else if (this._padSizeCache[className] != null) {
        return this._padSizeCache[className];
    }

    var padSize = {top:0, bottom:0, left:0, right:0},
        styleObject = isc.Element.getStyleEdges(className);
        
    if (styleObject == null) {
        padSize.nullLeft = true; padSize.nullRight = true;
        padSize.nullTop = true; padSize.nullBottom = true;
        return padSize;
    }
    
    var topPadding = styleObject.paddingTop,
        bottomPadding = styleObject.paddingBottom,
        leftPadding = styleObject.paddingLeft,
        rightPadding = styleObject.paddingRight,
        pxString = isc.px;

    // In some cases we will want to know whether a style contains specified padding *at all*,
    // as opposed to explicit zero.
    padSize.nullTop = (topPadding == null || topPadding == isc.emptyString);
    padSize.nullBottom = (bottomPadding == null || bottomPadding == isc.emptyString)
    padSize.nullLeft = (leftPadding == null || leftPadding == isc.emptyString);
    padSize.nullRight = (rightPadding == null || rightPadding == isc.emptyString);
        
    if (isc.isA.String(topPadding) && isc.endsWith(topPadding, pxString)) 
        padSize.top = parseInt(topPadding);

    if (isc.isA.String(bottomPadding) && isc.endsWith(bottomPadding, pxString)) 
        padSize.bottom = parseInt(bottomPadding);
        
    if (isc.isA.String(leftPadding) && isc.endsWith(leftPadding, pxString)) 
        padSize.left = parseInt(leftPadding);
        
    if (isc.isA.String(rightPadding) && isc.endsWith(rightPadding, pxString)) 
        padSize.right = parseInt(rightPadding);

    this._padSizeCache[className] = padSize;

    return padSize;
    
},

//>	@classMethod	Element._getVPadding()
// Get the total size of the vertical padding for the style passed in.
//
//  @param  className   (string)    className to test for padding size
//  @return             (number)    size of vertical padding in pixels
//<
_getVPadding : function (className) {
    return this._getTopPadding(className) + this._getBottomPadding(className);
},

//>	@classMethod	Element._getHPadding()
// Get the total size of the horizontal padding for the style passed in.
//
//  @param  className   (string)    className to test for padding size
//  @return             (number)    size of horizontal padding in pixels
//<
_getHPadding : function (className) {
    return this._getLeftPadding(className) + this._getRightPadding(className);
},

//>	@classMethod	Element._getVBorderPad()
// Get the total size of the padding and border for this style, for the vertical axis.
//
//  @param  className   (string)    className to test for VBorderPad
//  @return             (number)    size of VBorderPad in pixels
//<
_getVBorderPad : function (className) {
    return this._getVBorderSize(className) + this._getVPadding(className);
},

//>	@classMethod	Element._getHBorderPad()
// Get the total size of the padding and border for this style, for the horizontal axis.
//
//  @param  className   (string)    className to test for HBorderPad
//  @return             (number)    size of HBorderPad in pixels
//<
_getHBorderPad : function (className) {
    return this._getHBorderSize(className) + this._getHPadding(className);
},

// ----------------------

// getNativeScrollbarSize()
// 
// If the browser is showing native scrollbars, we have no way of knowing their thickness by
// default. This can be set at the OS level (via the Control Panel in windows), and the 
// defaults vary based on which OS is being used.
// This method determines the size of the scrollbars by writing a DIV into the DOM and 
// examining it

getNativeScrollbarSize : function () {
    if (isc.Element._nativeScrollbarSize == null) {
        if (isc.Browser.isMobileWebkit) {
            // native scrollbars don't exist in iPhone
            return (isc.Element._nativeScrollbarSize = 0);
        }
        var elementHTML = "<div id=isc_ScrollbarTest " 
                            + "style='position:absolute;top:-100px;border:0px;padding:0px;margin:0px;height:100px;width:100px;overflow:scroll;'>"
                            + isc.nbsp // XHTML
                            + "</div>";
        this.createAbsoluteElement(elementHTML);
        var sbTest = this.get('isc_ScrollbarTest');
        isc.Element._nativeScrollbarSize = parseInt(sbTest.style.height) - sbTest.clientHeight;

        // At this point we've determined the scrollbar size, and can clear the test div out 
        // from the DOM
        this.clear(sbTest);
    }

    return isc.Element._nativeScrollbarSize;
},

// ---------------------------------------------------------------------------------------




// Return CSS to transform by degrees around an origin

_transformCSSName: (isc.Element.vendorStylePrefix + "Transform" in document.documentElement.style
                    ? isc.Element.vendorCSSPrefix + "transform"
                    : "transform"),
_transformOriginCSSName: (isc.Element.vendorStylePrefix + "TransformOrigin" in document.documentElement.style
                          ? isc.Element.vendorCSSPrefix + "transform-origin"
                          : "transform-origin"),
getRotationCSS : function (degrees, origin) {
    degrees = +degrees;
    
    var prefix = this.vendorCSSPrefix;
    
    var text = this._transformCSSName + ": rotate(" + degrees.toFixed(3) + "deg);";
    if (origin != null) {
        text += this._transformOriginCSSName + ": " + origin + ";";
    }
    return text;
},

_transformStyleName: (isc.Element.vendorStylePrefix + "Transform" in document.documentElement.style
                      ? isc.Element.vendorStylePrefix + "Transform"
                      : "transform"),
_transformOriginStyleName: (isc.Element.vendorStylePrefix + "TransformOrigin" in document.documentElement.style
                            ? isc.Element.vendorStylePrefix + "TransformOrigin"
                            : "transformOrigin"),
_updateTransformStyle : function (sourceElement, transformFunctions, origin) {
    

    var handle = sourceElement.getClipHandle();
    if (handle == null) return;

    
    sourceElement._$leftCoords = sourceElement._$topCoords = null;
    sourceElement._childrenCoordsChanged();

    if (!transformFunctions) transformFunctions = "none";

    var style = handle.style;
    style[this._transformStyleName] = transformFunctions;
    if (origin != null) {
        style[this._transformOriginStyleName] = origin;
    }
}

});

isc.Element._ElementInit = function () {

    var edgeMask = this._styleEdgeMask = {
            
            borderLeftWidth:"border-left-width", 
            borderRightWidth:"border-right-width", 
            borderTopWidth:"border-top-width", 
            borderBottomWidth:"border-bottom-width",
            marginLeft:"margin-left",
            marginRight:"margin-right",
            marginTop:"margin-top",
            marginBottom:"margin-bottom",

            
            paddingLeft:"padding-left", 
            paddingRight:"padding-right",
            paddingTop:"padding-top", 
            paddingBottom:"padding-bottom"
    }

    var fullMask = this._styleFullMask = isc.addProperties({
            position:"position", 
            overflow:"overflow",
            top:"top",
            left:"left",
            width:"width",
            height:"height",
            
            // display - block vs. inline (etc.)
            display:"display"
    }, edgeMask);

    if (isc.Browser.isIE || isc.Browser.isOpera) {
        this._styleFullMaskArray = isc.getKeys(fullMask);
        this._styleEdgeMaskArray = isc.getKeys(edgeMask);
    }
}
isc.Element._ElementInit();




//> @groupDef domIntegration
// SmartClient provides a huge variety of pre-built components and allows you to create new
// components via combining and composing the existing components.  However in rare cases, it can
// make sense to write code that works directly with raw HTML and the browser's DOM (document
// object model) APIs.  This level of coding is also involved when integrating third-party
// JavaScript components into SmartClient applications.
// <P>
// First, a warning: when you use HTML and the DOM directly, all of SmartClient's guarantees of
// cross-browser consistent behavior no longer apply.  When you use SmartClient's API, SmartClient
// is automatically compensating for many, many browser bugs - not just trivial things like
// different property names or missing utility methods, but problems where browsers fail to fire
// certain events, report sizes wrong only in certain modes with certain styling, or bugs that
// only occur with specific timing.
// <P>
// Before deciding to do direct HTML coding, consider whether you really want to expose yourself
// to all of these possible issues.  If you can achieve the same look and feel and behavior
// through SmartClient's APIs, that's usually best.
// <P>
// <h3>Adding or modifying the DOM</h3>
// <P>
// The DOM structures used by SmartClient necessarily differ by browser in order to work around
// each browser's specific bugs.  This DOM structure is intentionally undocumented because it is
// subject to change without notice - in may be necessary to modify the DOM structure to work
// around the bugs in each new browser release.
// <P>
// Instead of trying to modify the SmartClient-generated DOM, you should always <b>add new
// elements</b>.  For a new standalone component that will be based on direct use of HTML, you
// usually do this by subclassing Canvas and overriding +link{Canvas.getInnerHTML()} and returning
// an HTML string representing the components you want to create.
// <P>
// You can use a similar approach anywhere HTML is allowed in a widget property: formatting APIs
// for StaticTextItem, DetailViewer, TileGrid, and other DataBoundComponents, as well as places
// such as +link{tab.title} or +link{button.title}.
// <P>
// <h3>Third-party components</h3>
// <P>
// Most third-party JavaScript components have the ability to generate their HTML content into a
// DOM element specified by ID, or to replace such an element with new HTML.  This is true of
// Google Maps, +externalLink{http://ckeditor.com,CKEditor} and many other libraries.
// <P>
// To use this form of integration, implement a +link{canvas.getInnerHTML()} function that returns
// a DOM element with a known ID, then have the third-party library target that DOM element once
// the Canvas is drawn.  For example, CKEDITOR.replace() takes the ID of a &lt;textarea&gt;
// element, and the following code would create a &lt;textarea&gt; and have the CKEditor replace
// it with a CKEditor widget: 
// <smartclient>
// <pre>
// isc.defineClass("CKEditor", "Canvas");
// isc.CKEditor.addProperties({
//     // write out a textarea with a known ID
//     getInnerHTML : function () {
//         return "&lt;textarea style="width:100%;height:100%" ID='" + 
//                           this.getID() + "_ckEditor" + "'>&lt;/textarea>";
//     },
//     // call superclass method to draw, then have CKEditor replace the textarea we
//     // wrote out with the CKEditor widget
//     draw : function () {
//         if (!this.readyToDraw()) return this;
//         this.Super("draw", arguments);
//         CKEDITOR.replace(this.getID() + "_ckEditor";
//         return this;
//     },
//     redrawOnResize:false // see next section
// });
// </pre>
// </smartclient>
// <smartgwt>
// <pre>
// public class CKEditor extends Canvas {
// 
//     private static native void replace(String id) &#47;*-{
//         $wnd.CKEDITOR.replace(id);
//     }-*&#47;;
// 
//     public CKEditor() {
//         setRedrawOnResize(false);
//     }
// 
//     &#64;Override
//     public String getInnerHTML() {
//         return "&lt;textarea id='" + getID() + "_ckEditor' style='width:100%;height:100%'>&lt;/textarea>";
//     }
// 
//     &#64;Override
//     protected void onDraw() {
//         CKEditor.replace(getID() + "_ckEditor");
//     }
// }
// </pre>
// </smartgwt>
// <P>
// This same approach can be used when you want to insert third-party generated HTML into just a
// specific part of a SmartClient widget.  For example, you might want to insert 
// +externalLink{https://www.google.com/search?q=jquery+sparklines,JQuery 'sparklines'}, which are
// essentially miniature charts, into cells of a ListGrid.  You could use
// +link{listGridField.formatCellValue,a cell formatter} to write out &lt;div&gt; elements with
// known IDs into the cells, then target them with JQuery.
// <P>
// <h3>Resizing and Redraw</h3>
// <P>
// When implementing <code>canvas.getInnerHTML()</code>, your getInnerHTML() function will be
// called every time the component redraw()s, and the new HTML will replace the old.  This is also
// true of something like a ListGrid cell formatter.
// <P>
// Also by default, your component will redraw() if it is resized.  In the example above with
// CKEditor, we wouldn't want this because it would wipe out the CKEditor widget every time it was
// resized, so we set +link{canvas.redrawOnResize} to false.  In other circumstances you may want
// to redraw on every resize in order to generate new HTML.
// <P>
// If you do not redraw HTML on resize, you either have to write the HTML in a way that makes it
// flow into available space (width/height 100% may be enough here) <b>or</b> you need to manually
// resize the DOM element when the +link{canvas.resized,resized event} fires.  
// <P>
// In the latter case, you should adjust the size of the DOM element to match the
// +link{canvas.getInnerWidth(),inner width} and 
// +link{canvas.getInnerHeight(),inner height} of the containing Canvas.  The "inner" dimensions
// are the dimensions after border and margins have been subtracted, so this will work even if a
// border is added to your Canvas subclass via CSS or +link{canvas.setBorder()}.
// <P>
// <h3>Other redraws</h3>
// <P>
// Once you have set +link{canvas.redrawOnResize} to false you may still see redraws from other
// sources.  Generally this would be from code in your application which calls
// +link{canvas.redraw()} or +link{canvas.markForRedraw()} unnecessarily.  To troubleshoot, you
// can enable the "redraws" log category in the Developer Console - this will log the source of
// any redraws in the system.
// <P>
// <h3>Masking during drags</h3>
// <P>
// Third-party components that utilize iframes, browser plugins or other special elements will
// "swallow" events such that SmartClient never receives them.  This is a problem whenever a
// drag interaction goes over the component, including drag resizing of the component itself.
// To avoid this issue, set +link{canvas.useDragMask} for any component that contains an iframe
// or browser plugin, or that appears to be swallowing events during drag.  The telltale sign
// is that when the mouse goes over the plugin, the visual effect of the drag (differs by
// +link{canvas.dragAppearance}) stops updating or stutters.
// <P>
// <h3>Overflow &amp; Auto-Sizing</h3>
// <P>
// Consider which +link{canvas.overflow} setting to use for your custom component:
// <ul>
// <li> <code>overflow:"hidden"</code> is the most common.  In the context of third-party
// components, it means the component is prepared to render itself at any requested size (above
// a minimum). 
// <li> <code>overflow:"visible"</code> means you want SmartClient to attempt to automatically
// determine a minimum size based on the HTML content generated by the custom component
// <li> <code>overflow:"auto"</code> is similar to <code>overflow:"hidden"</code>, but means
// your custom component needs SmartClient to create scrollbars whenever its HTML content does
// not fit in the allocated space.
// </ul>
// Note that with the automatic measurement of HTML content enabled by
// <code>overflow:"visible"</code> or <code>overflow:"auto"</code>, if you make on-the-fly
// modifications to the HTML you returned from <code>getInnerHTML()</code>, there is no
// cross-browser-reliable way for the Canvas to detect this and auto-size again.  Instead, call
// +link{canvas.adjustForContent()} to trigger auto-sizing again.
// <P>
// <h3>zIndex</h3>
// <P>
// zIndex values control what component is rendered "on top" when multiple components appear in
// the same area of the page.
// <P>
// To work around various browser issues, SmartClient components use a very high range of
// zIndex values.  If a component creates pop-up widgets such as hovers or floating toolbars
// via direct HTML/DOM usage, these pop-up widgets will appear <b>behind</b> all SmartClient
// components unless they set a very high zIndex.  
// <P>
// For your own custom HTML/DOM components, the simplest strategy is to create pop-up widgets
// based on SmartClient components, even if they are triggered by interacting with
// hand-created HTML.  For example, even if you've written some kind of advanced SVG-based data
// visualization component, you can still implement pop-up configuration dialogs based on the
// SmartClient +link{Window} class; there's no reason to implement such dialogs directly in
// low-level HTML/DOM code.
// <P>
// If a third-party widget is creating pop-ups you don't directly control, you may be able to
// configure the third-party widget to use a certain zIndex range, or you may be able to
// directly reach into the widget's DOM and modify zIndexes that way.  You can use
// +link{canvas.getZIndex()} to discover the zIndex of any SmartClient widget you need to
// appear above, then set a higher value.
// <P>
// Finally, as a last resort and completely unsupported approach, you can modify the zIndex
// range used by SmartClient using the following JavaScript code:
// <pre>
// isc.Canvas.addClassProperties({
//    // default zIndex for the next item to be drawn
//    _nextZIndex:200000,
//
//    // zIndex of the next item to be sent to the back
//    _SMALL_Z_INDEX:199950,
//
//    // zIndex of the next item to be brought to the front
//    _BIG_Z_INDEX:800000
// });
// </pre>
// <P>
// <h3>Other issues</h3>
// <P>
// There are several other issues, listed below, for which there really is no general strategy
// for solving the issue, although some general pointers are provided.
// <P>
// Because of problems like these, it's a very very bad idea to freely intermix components from
// multiple component libraries.  While mixing components may appear to be an appealing
// strategy and you may experience apparent success with early attempts, the issues below will
// ultimately prevent you from completing an application of sufficient quality for enterprise
// use.
// <P>
// In the following discussion, "third-party widgets" should be understood to include
// widgets that you write using direct DOM/HTML techniques.
// <ul>
// <li> <b>tabbing order / accessibility</b>: a correct tabbing order that visits all
// components on the page is a requirement for your application to be considered accessible, as
// is ARIA markup (for more information, see +link{groupDef:accessibility}).  Third-party
// widgets may completely lack ARIA markup, such that you may be required to modify them or
// reach into their DOM to add ARIA attributes.  It may be necessary to add manual keyDown or
// keyPress event handlers to handle focus moving from SmartClient components to third-party
// widgets and back.
//
// <li> <b>modality</b>: aside from zIndex issues covered above, modality means that the tab
// order should be a closed loop that reaches only active widgets, which can create additional
// complexity in getting tabbing to work correctly.  Also, keyboard shortcuts should be
// disabled for inactive widgets; this may require calls to
// +link{EventHandler.targetIsMasked()} to make third-party widgets respect SmartClient
// modality, or may require calls to +link{Canvas.showClickMask()} to cause SmartClient
// components to consider themselves inactive when a third-party widget opens a pop-up that is
// intended to be modal.  Multi-layered modality, such as a modal window that in turn pops a
// modal dialog, is yet more complex.
//
// <li> <b>bad CSS</b>: some third-party widgets introduce CSS selectors that target, for
// example, every table cell on the entire page.  This very bad practice will interfere with
// SmartClient (or any other HTML on the page).  This may require modifying the third-party
// component, or extensively modifying SmartClient CSS to reverse any changes caused by
// third-party CSS.  For example, it may be necessary to modify every SmartClient CSS style
// that may be applied to a table cell to reverse a change in padding for all table cells that
// is introduced by bad third-party CSS.
//
// <li> <b>skinning</b>: third-party widgets may lack sufficient skinning APIs to allow you to match
// look and feel to SmartGWT, which may necessitate creating a custom SmartGWT skin to match
// the look and feel of third-party widgets (see +link{groupDef:skinning,Skinning Overview})
//
// <li> <b>event interference</b>: third-party widgets may register page-wide event handling
// logic that conflicts with or destroys similar event handling logic in SmartClient.  For best
// results, load third-party JavaScript libraries <b>before</b> SmartClient since SmartClient
// makes a best effort to preserve any previously installed handlers and allows such handlers to
// cancel native browser behaviors if they do so.
//
// <li> <b>RTL / i18n</b>: third party widgets may not allow all user-visible messages to be
// replaced, a requirement for internationalization / localization, or they may not support
// RTL/BIDI (Right-To-Left / Bi-Directional) rendering
// </ul>
//
// Because of issues like the above, not all of which may be resolvable for some third-party
// widgets, we recommend the following overall approach:
// <ul>
// <li> avoid using third-party widgets if you can build equivalent functionality in
//      SmartClient
// <li> if the third-party component is completely non-interactive, either does not require
//      ARIA markup or already includes such markup, and there are no conflicting look and feel
//      issues, go ahead and use it
// <li> if you anticipate issues, consider the 
// +externalLink{http://www.smartclient.com/services/index.jsp#features,Feature Sponsorship Program} 
//      as a means of getting new supported functionality added to SmartClient
// <li> search for existing posts and/or ask about the feasibility of integration on the
//      +externalLink{http://forums.smartclient.com/,SmartClient Forums}.
// <li> finally, you could attempt to tackle the issues above on your own.  To avoid wasting
//      time on dead ends, we would recommend assessing the amount of work involved in fixing
//      <b>all</b> problems that need to be solved before attempting actual fixes for any one issue.
// </ul>
//
// @title DOM Integration &amp; Third-party Components
// @treeLocation Concepts
// @visibility external
//<
