
/*

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

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

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

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

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

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

*/


//> @class RangeSlider
// A "double slider" allowing the user to select a range via two draggable thumbs.
//
//@treeLocation Client Reference/Control
//
// @visibility external
//<

//> @attr rangeSlider.startThumb (AutoChild Snapbar : null : IR)
// Thumb for the start of the range.
//
// @visibility external
//<

//> @attr rangeSlider.endThumb (AutoChild Snapbar : null : IR)
// Thumb for the end of the range
//
// @visibility external
//<

//> @method rangeSlider.changed()
// Notification fired when the selected range is changed by the end user.
//
// @param startValue (float) new start value
// @param endValue (float) new end value
// @param isDragging (boolean) whether the user is still in the middle of a drag, so that
//  expensive operations can be avoided if needed
//
// @visibility external
//<

//> @attr rangeSlider.track (AutoChild Canvas : null : IR)
// Optional track of the RangeSlider.  Set <code>showTrack</code> false to avoid showing
// a track so the RangeSlider can be superimposed over something else.
//
// @visibility external
//<

//> @attr rangeSlider.scrollbar (AutoChild Scrollbar : null : IR)
// Optional Scrollbar shown as a second way of adjusting the range.
//
// @visibility external
//<

isc.defineClass("RangeSlider", isc.Canvas);

isc.RangeSlider.addClassProperties({
    
    _epsilon: 1e-6
});

isc.RangeSlider.addProperties ({

//> @attr rangeSlider.vertical (boolean : false : IR)
// Whether the rangeSlider should be vertical or horizontal.  Default is horizontal.
//
// @visibility external
//<
    vertical: false,

//> @attr rangeSlider.minValue (float : 0 : IRW)
// Set the minimum value (left/top of slider).
//
// @visibility external
//<
    minValue: 0,

//> @attr rangeSlider.maxValue (float : 0 : IRW)
// Set the maximum value (right/bottom of slider).
//
// @visibility external
//<
    maxValue: 0,

//> @attr rangeSlider.startValue (float : 0 : IRW)
// The beginning of the selected range.
//
// @visibility external
//<
    startValue: 0,

//> @attr rangeSlider.endValue (float : 0 : IRW)
// The end of the selected range.
//
// @visibility external
//<
    endValue:0,
    
 // @attr rangeSlider.baseStyle (CSSStyleName : "rangeSlider" : IR)
 // Base style name for CSS styles applied to the background of the rangeSlider.  The following
 // suffixes are applied for different areas of the slider:
 // <ul>
 // <li> "Start": area of the slider before the startThumb
 // <li> "Selected": area of the slider between the thumbs (the selected range)
 // <li> "End": area of the slider after the endThumb
 // </ul>
 // .. and the following suffixes are applied in addition according to the slider's dynamic state:
 // <ul>
 // <li> "Over": if the mouse is over the segment
 // <li> "Down": if the mouse is down on the segment
 // </ul>
 // For example, if the mouse is down in the area before the start thumb, that area will have the
 // CSS style "rangeSliderStartDown".
 //
 // @visibility external
 //<
    baseStyle:"rangeSlider",
    
    overflow:"hidden",
    thumbSize:"7px",
    
    labelStartDefaults: {
    	_constructor:isc.Label,
    	wrap:false,
    	overflow:"hidden"
    },

    startThumbDefaults: {
    	_constructor:isc.Snapbar, 
        wrap:false,  
        overflow:"hidden", 
        canDrag:true,
        keepInParentRect: true,
        canCollapse:false,
        showGrip:true,
        showClosedGrip:false,
        _canDragWhenTargetIsHidden:true,

        dragStart : function() {
            this.creator.oldStartValue = this.creator.startValue;
            this.creator.dragpoint = this.creator.vertical?isc.Event.mouseDownEvent.y:isc.Event.mouseDownEvent.x;

            this.creator.isDragging = true;

            this.creator.fireChangedEvent();
        },
        
        dragMove : function() {
        	// get pixel range and convert it to value range
            var val = this.creator.vertical?this.creator.getValuesForPixels(isc.Event.lastEvent.y-this.creator.dragpoint):
            	this.creator.getValuesForPixels(isc.Event.lastEvent.x-this.creator.dragpoint);

            this.creator.setStartValue(this.creator.oldStartValue+val);
            
            this.creator.fireChangedEvent();
            
            return true;
        },

        dragStop : function() {
            this.creator.isDragging = false;
            this.creator.fireChangedEvent();
        }
     },

    labelDragDefaults: {
        _constructor:isc.Label,
        overflow:"hidden",
        canDrag:true,
        keepInParentRect: true,
        dragAppearance:"none",

        dragMove : function() {
        	
        	// get pixel range and convert it to value range
            var val = this.creator.vertical?this.creator.getValuesForPixels(isc.Event.lastEvent.y-this.creator.dragpoint):
            	this.creator.getValuesForPixels(isc.Event.lastEvent.x-this.creator.dragpoint);

            this.creator.setValues(this.creator.oldStartValue+val, this.creator.oldEndValue+val);
            
            this.creator.fireChangedEvent();

            return true;
        },

        dragStart : function() {
        	this.creator.oldStartValue = this.creator.startValue;
            this.creator.oldEndValue = this.creator.endValue;

            this.creator.dragpoint = this.creator.vertical?isc.Event.mouseDownEvent.y:isc.Event.mouseDownEvent.x;

            this.creator.isDragging = true;

            this.creator.fireChangedEvent();
        },

        dragStop : function() {
            this.creator.isDragging = false;

            this.creator.fireChangedEvent();
        }
    },

    labelEndDefaults: {
        _constructor:isc.Label,
        overflow:"hidden"
    },

    endThumbDefaults: {
        _constructor:isc.Snapbar, 
        canDrag:true,
        overflow:"hidden", 
        keepInParentRect: true,
        canCollapse:false,
        showGrip:true,
        _canDragWhenTargetIsHidden:true,

        dragStart : function() {
            this.creator.oldEndValue = this.creator.endValue;
            this.creator.dragpoint = this.creator.vertical?isc.Event.mouseDownEvent.y:isc.Event.mouseDownEvent.x;

            this.creator.isDragging = true;
            this.creator.fireChangedEvent();
        },

        dragMove : function() {
        	// get pixel range and convert it to value range
            var val = this.creator.vertical?this.creator.getValuesForPixels(isc.Event.lastEvent.y-this.creator.dragpoint):
            	this.creator.getValuesForPixels(isc.Event.lastEvent.x-this.creator.dragpoint);

            this.creator.setEndValue(this.creator.oldEndValue+val);

            if (this.creator.scrollbar) {
                this.creator.scrollbar.moveThumb();
            }

            this.creator.fireChangedEvent();
            return true;
        },

        
        dragStop : function() {
            this.creator.isDragging = false;

            this.creator.fireChangedEvent();
        }
     },


    scrollbarDefaults: {
        thumbDragStop : function() {
            this.Super("thumbDragStop",	arguments);
            this.creator.thumbdragging = false;
            this.creator.isDragging = false;
           
            this.creator.updatePositions();
            this.creator.fireChangedEvent();
        },

        thumbDragStart : function() {
            this.Super("thumbDragStart",	arguments);
            this.creator.thumbdragging = true;
            this.creator.isDragging = true;
            
            this.creator.oldStartValue = this.creator.startValue;
            this.creator.oldEndValue = this.creator.endValue;

            this.creator.dragpoint = this.getEventCoord();
            this.creator.fireChangedEvent();
        }
    }
});

isc.RangeSlider.addMethods ({
	
    initWidget : function() {
        this.Super("initWidget", arguments);
        
        // value sanity checks
        if (this.maxValue < this.minValue) { 
            var x = this.minValue;
            this.minValue = this.maxValue;
            this.maxValue = x;
        }

        if (this.startValue < this.minValue) {
            this.startValue = this.minValue;
        }

        if (this.endValue > this.maxValue) {
            this.endValue = this.endValue;
        }
        
        // lazily initialize track defaults
        if (!this.trackDefaults) {
        	isc.RangeSlider.setInstanceProperty("trackDefaults", this.getTrackDefaults());
        }
        	
        // create the controls either vertically or horizontally
        if (this.vertical) {
            this.createControls(true);
        }
        else {
            this.createControls();
        }
    },
    
    // return the default properties for the track.
    getTrackDefaults : function() {
    	
    	return {
    		overflow:"hidden", 
	        showDisabled:true,
	        cacheImageSizes: false,
	    	_constructor:isc.Slider.getInstanceProperty("trackConstructor"),
	    	capSize:isc.Slider.getInstanceProperty("trackCapSize"),
	    	skinImgDir:isc.Slider.getInstanceProperty("skinImgDir"),
	    	imageType:isc.Slider.getInstanceProperty("trackImageType"),
	    	trackSrc : isc.Slider.getInstanceProperty("trackSrc")
    	};    
    },

    // overwrite resized so track size and thumb positions are updated on resize
    resized : function() {
        this.Super("resized", arguments);

        if (this.showTrack) {
            if (this.vertical) {
                this.track.setWidth(isc.Slider.getInstanceProperty("trackWidth"));
                this.track.setHeight(this.height);
            } else {
                this.track.setHeight(isc.Slider.getInstanceProperty("trackWidth"));
                this.track.setWidth(this.width);
            }
        }

    	this.updatePositions();
    },

    // create the child controls and set up the callback functions
    createControls : function(vertical) {
        var that =  this;
        var remaining;
        var trackWidth = isc.Slider.getInstanceProperty("trackWidth");

        if (vertical) {
            this.scrollbar = this.addAutoChild("scrollbar", { 
                _constructor:this.scrollbarConstructor, 
                vertical:true, 
                height:"100%"
            });

            if (this.scrollbar) {
                remaining = this.getWidth() - this.scrollbar.getWidth();
                this.scrollbar.setLeft(remaining);
                this.scrollbar.setTop(0);
            } else {
                remaining = this.getWidth()
            }
            
            this.labelStart = this.addAutoChild("labelStart", {
                width:remaining,
                baseStyle:this.baseStyle+"Start"
            });

            this.labelDrag = this.addAutoChild("labelDrag", { 
                width:remaining,
                baseStyle:this.baseStyle+"Selected"
            });

            this.labelEnd = this.addAutoChild("labelEnd", { 
                width:remaining,
                baseStyle:that.baseStyle+"End"
            });

            this.startThumb = this.addAutoChild("startThumb", { 
                height:this.thumbSize, 
                width:remaining,
                target:this.labelStart,
                vertical:false
            });

            this.endThumb = this.addAutoChild("endThumb", { 
                height:this.thumbSize, 
                width:remaining,
                target:this.labelEnd,
                vertical:false,
                
                makeLabel:function() {
                	this.Super("makeLabel", arguments);
                    this.label.addMethods({
                    	getCustomState : function () {
                    		// don't show closed state if showClosedGrip is set to false
                    		if (isc.Snapbar.getInstanceProperty("showClosedGrip")) {
                    			return "closed";
                    		}
                    	}
                    });
                }
            });

            this.track = this.addAutoChild("track", {
            	left:Math.round(remaining/2-trackWidth/2),
            	width:trackWidth, 
            	height:this.height,
            	vertical:this.vertical,
            	
        		src:"[SKIN]"+(this.vertical? "v" : "h")+isc.Slider.getInstanceProperty("trackSrc"),
                styleName:isc.Slider.getInstanceProperty((this.vertical ? "v" : "h") + "TrackStyle")
        	});
        } else {
            this.scrollbar = this.addAutoChild("scrollbar", { 
                _constructor:isc.Scrollbar, 
                vertical:false, 
                width:"100%"
            });

            if (this.scrollbar) {
                remaining = this.getHeight() - this.scrollbar.getHeight();
                this.scrollbar.setLeft(0);
                this.scrollbar.setTop(remaining);
            } else {
                remaining = this.getHeight();
            }

            this.labelStart = this.addAutoChild("labelStart", {
                height:remaining,
                baseStyle:this.baseStyle+"Start"
            });

            this.labelDrag = this.addAutoChild("labelDrag", { 
                height:remaining,
                baseStyle:this.baseStyle+"Selected"
            });

            this.labelEnd = this.addAutoChild("labelEnd", { 
                height:remaining,
                baseStyle:this.baseStyle+"End"
            });

            this.startThumb = this.addAutoChild("startThumb", { 
                width:this.thumbSize, 
                height:remaining,
                target:this.labelStart
            });

            this.endThumb = this.addAutoChild("endThumb", { 
                width:this.thumbSize, 
                height:remaining,
                target:this.labelEnd,
                
                makeLabel:function() {
                	this.Super("makeLabel", arguments);
                    this.label.addMethods({
                    	getCustomState : function () {
                    		// don't show closed state if showClosedGrip is set to false
                    		if (isc.Snapbar.getInstanceProperty("showClosedGrip")) {
                    			return "closed";
                    		}
                    	}
                    });
                }
            });

            this.track = this.addAutoChild("track", {
            	top:Math.round(remaining/2-trackWidth/2),
            	height:trackWidth, 
            	width:this.width,
            	vertical:this.vertical,
            	
        		src:"[SKIN]"+(this.vertical? "v" : "h")+isc.Slider.getInstanceProperty("trackSrc"),
                styleName:isc.Slider.getInstanceProperty((this.vertical ? "v" : "h") + "TrackStyle")
        	});
            
        };

        if (this.track) {
        	this.track.sendToBack();
        }

        if (this.scrollbar) {
            this.scrollbar.setScrollTarget(this);
        }
        
        this.updatePositions();

    },

    // called when mouse-up happens on the control.
    // this is not called when dragging happens
    mouseUp : function() {
        
        if (this.vertical) {
			var val = this.getOffsetY()-this.startThumb.getHeight();
		} else {
			var val = this.getOffsetX()-this.startThumb.getWidth();
		}

        this.slideSelectedRangeByPoints(val);

        this.fireChangedEvent();
    },

    // slide the selected range to so it's middle point will be at given point
    // values are clamped at  [minValue,maxValue] range
    slideSelectedRangeByPoints : function (pixels) {
        var val = this.getValuesForPixels(pixels);
        
		// compute it's middle value
		var avg = (this.endValue-this.startValue)/2;
		
		// simulate dragging so values are clamped instead of ignored if they're
		// outside of bounds
		this.isDragging = true;

		this.setValues(val-avg+this.minValue, val+avg+this.minValue);

		this.isDragging = false;
    },

    // this is called when the user drags the scrollbar
    // scroll the scrollbar to a ratio. If the scrollbar is at either one of its
    // ends, then the entire selected range is slided out - if dragging - or
    // it has both startValue and endValue 0,0 or maxValue, maxValue
    scrollToRatio : function(vertical, ratio, reason) {

    	// compute the ratio of how much was thumb dragged vs the track size, since 
    	// we need to know how much we need to move the selected range towards min or max value
        var dragratio = (this.scrollbar.getEventCoord() - this.dragpoint)/(this.scrollbar.trackSize());
        var val = this.getValueForScrollRatio(dragratio);
        this.setValues(this.oldStartValue+val,this.oldEndValue+val);

    	this.fireChangedEvent();
    },

    // scroll by a small amount (20px) when scroll buttons are clicked
    scrollByDelta : function(vertical, direction, reason) {
        var range = this.endValue-this.startValue;

        // compute the value/pixel ratio, without the width/height of the splitter bars
        if (this.vertical) {
            var w = this.getHeight()-this.startThumb.getHeight()-this.endThumb.getHeight();
            
        } else {
            var w = this.getWidth()-this.startThumb.getWidth()-this.endThumb.getWidth();
        }

        var ratio =  (this.maxValue-this.minValue)/w;
        
        // compute how much of range is 20 pixels and move the range
        var amount = 20*ratio*direction;

        var start = this.startValue + amount;
        var end = this.endValue + amount;

        // make sure when end is reached, rage is not changed
        if (start<this.minValue) {
            start = this.minValue;
            end = this.minValue + range;
        }

        if (end>this.maxValue) {
            end = this.maxValue;
            start = this.maxValue-range;
        }

        this.isDragging = true;

        this.setValues(start, end);
        this.isDragging = false;
        this.fireChangedEvent();
    },

    // scroll by a viewport (the selected range)
    scrollByPage : function(vertical, direction, reason) {
        // compute the width of viewport and either add it or remove it from 
        // the start value and end value
        var amount = Math.max((this.endValue-this.startValue),0)*direction;

        var start = this.startValue + amount;
        var end = this.endValue + amount;

        // make sure when end is reached, rage is not changed
        if (start<this.minValue) {
            start = this.minValue;
            end = this.minValue + Math.abs(amount);
        }

        if (end>this.maxValue) {
            end = this.maxValue;
            start = this.maxValue-Math.abs(amount);
        }

        this.isDragging = true;

        this.setValues(start, end);
        this.isDragging = false;
        this.fireChangedEvent();
    },

    
    getViewportRatio : function (vertical) {
        var range = this.maxValue - this.minValue,
            selectedRange = 0;
        if (this.thumbdragging) {
            selectedRange = this.oldEndValue - this.oldStartValue;
        } else {
            selectedRange = this.endValue - this.startValue;
        }
        return (Math.abs(range) < isc.RangeSlider._epsilon ? 0 : selectedRange / range);
    },

    
    getScrollRatio : function (vertical) {
        var range = this.maxValue - this.minValue,
            selectedRange = this.endValue - this.startValue;
        return (
            Math.abs(range - selectedRange) < isc.RangeSlider._epsilon
                ? 0 : (this.startValue - this.minValue) / (range - selectedRange));
    },

    // Convert a scroll ratio to a value.
    getValueForScrollRatio : function(val) {
        return val * (this.maxValue - this.minValue);
    },

    // convert a length in pixels in length in values
    getValuesForPixels : function(val) {

        if (this.vertical) {
            return val*(this.maxValue-this.minValue)/(this.getHeight());
        }
        else {
            return val*(this.maxValue-this.minValue)/(this.getWidth());
        }
    },

    // recompute the position of all components according to the current
    // minValue, maxValue, startValue, endValue
    // this will implicitly resize also the scrollbar in concordance with
    // the ratio of the selected range vs minValue-maxValue range
    updatePositions : function() {

        // compute the pixel/value ratio, without the width/height of the splitter bars
        if (this.vertical) {
            var w = this.getHeight()-this.startThumb.getHeight()-this.endThumb.getHeight();
            
        } else {
            var w = this.getWidth()-this.startThumb.getWidth()-this.endThumb.getWidth();
        }
        
        // make sure we have a valid ratio and we don't divide by 0 if this.minValue = this.maxValue
        var ratio = 0;

        if (this.maxValue-this.minValue > 0) {
            ratio =  w/(this.maxValue-this.minValue);
        }

        // compute the width of each segment
        var d1 = Math.round((this.startValue-this.minValue)*ratio);
        var d2 = Math.round((this.endValue-this.startValue)*ratio);
        var d3 = Math.round((this.maxValue-this.endValue)*ratio);
        var sum = Math.round((this.startValue-this.minValue+this.endValue-this.startValue)*ratio);
        
        if (this.vertical) {

        	if (d1 == 0) {
        		this.startThumb.target = this.labelDrag;
        	} else {
        		this.labelStart.show();
        		
                this.labelStart.setTop(0);
                this.labelStart.setHeight(d1);
        	}

        	if (d2 == 0) {
        		this.labelDrag.hide();
        	} else {
        		this.labelDrag.show();
                this.labelDrag.setHeight(d2);
                this.labelDrag.setTop(d1+this.startThumb.getHeight());       		
        	}

        	if (d3 == 0) {
        		this.labelEnd.hide();
        	} else {
        		this.labelEnd.show();
        		this.labelEnd.setTop(sum+this.startThumb.getHeight()+this.endThumb.getHeight());
                this.labelEnd.setHeight(d3);
        	}

            this.startThumb.setTop(d1);
            this.endThumb.setTop(sum+this.startThumb.getHeight());
        } 
        else {

        	if (d1 == 0) {
        		this.labelStart.hide();
        	}
        	else {
    			this.labelStart.show();
    			
        		this.labelStart.setLeft(0);
                this.labelStart.setWidth(d1);
        	}
        	
            if (d2 == 0) {
            	this.labelDrag.hide();
            }
            else {
            	this.labelDrag.show();
            	
            	this.labelDrag.setWidth(d2);
                this.labelDrag.setLeft(d1+this.startThumb.getWidth());
            } 
            	

            if (d3 == 0) {
            	this.labelEnd.hide();
            } else {
            	this.labelEnd.show();
            	
                this.labelEnd.setLeft(sum+this.startThumb.getWidth()+this.endThumb.getWidth());
                this.labelEnd.setWidth(d3);
            }

            this.startThumb.setLeft(d1);
            this.endThumb.setLeft(sum+this.startThumb.getWidth());
        }
        
        if (this.scrollbar) {
            this.scrollbar.setThumb();
        }
    },

    // clamp a given value to the allowed [minValue maxValue] range
    clampToMinMax : function (value) {
        if (value<=this.minValue) {
            value = this.minValue;
        }
        if (value >= this.maxValue) {
            value = this.maxValue;
        }

        return value;
    },

    // check if a value is in the allowed [minValue maxValue] range
    isInMinMaxRange : function(value) {
        if (value<this.minValue) {
            return false;
        }
        if (value > this.maxValue) {
            return false;
        }

        return true;
    },
    
    // set both startValue and endValue of the selected area simultaneously.
    // if change of values occurs while dragging , then we're clamping to 
    // [minValue maxValue] range
    // if no dragging occurs, then change is made by user request and we accept
    setValues : function (startv, endv) {

        if (this.isDragging) {
            startv = this.clampToMinMax(startv);
            endv = this.clampToMinMax(endv);
            
            this.startValue = startv;
            this.endValue = endv;
            
            this.updatePositions();
        } else {
            if (this.isInMinMaxRange(startv) && this.isInMinMaxRange(endv) &&
            		startv<=endv) {
                this.startValue = startv;
                this.endValue = endv;
                
                this.updatePositions();
            }

            // otherwise ignore
        }
    },
    
    // if change of startValue occurs while dragging , then we're clamping to 
    // [minValue maxValue] range
    // if no dragging occurs, then change is made by user request and we accept
    // the values only if they're legal
    setStartValue : function (value) {

        if (this.isDragging) {
            value = this.clampToMinMax(value);
            if (value >= this.endValue) {
                value =  this.endValue;
            }
            this.startValue = value;
            this.updatePositions();
        } else {
            if (this.isInMinMaxRange(value) && value <= this.endValue) {
                this.startValue = value;
                this.updatePositions();
            } else {
                isc.logWarn("Ignoring setStartValue to "+value+" (out of range).");
            }
        }
    },

    // if change of endValue occurs while dragging , then we're clamping to 
    // [minValue maxValue] range
    // if no dragging occurs, then change is made by user request and we accept
    // the values only if they're legal
    setEndValue : function( value ) {
        if (this.isDragging) {
            value = this.clampToMinMax(value);
            if (value <= this.startValue) {
                value =  this.startValue;
            }
            this.endValue = value;
            this.updatePositions();
        } else {
            if (this.isInMinMaxRange(value) && value >= this.startValue) {
                this.endValue = value;
                this.updatePositions();
            } else {
                isc.logWarn("Ignoring setEndValue to "+value+" (out of range).");
            }
        }
    },
    
    getStartValue : function() {
    	return this.startValue;
    },
    
    getEndValue : function() {
    	return this.endValue;
    },
    
    setMinValue : function(value) {
        this.minValue = value;
        this.updatePositions();
    },

    setMaxValue : function (value) {
        this.maxValue = value;
        this.updatePositions();
    },
    
    getMinValue : function() {
    	return this.minValue;
    },
    
    getMaxValue : function() {
    	return this.maxValue;
    },
    
    fireChangedEvent : function() {
        this.changed(this.startValue, this.endValue, this.isDragging);
    },

    changed : function (startValue, endValue, isDragging) {}
});
