framework/images/webapp/images/dojo/src/widget/FisheyeList.js

/*
	Copyright (c) 2004-2006, The Dojo Foundation
	All Rights Reserved.

	Licensed under the Academic Free License version 2.1 or above OR the
	modified BSD license. For more information on Dojo licensing, see:

		http://dojotoolkit.org/community/licensing.shtml
*/

dojo.provide("dojo.widget.FisheyeList");

//
// TODO
// fix SVG support, and turn it on only if the browser supports it
// fix really long labels in vertical mode
//

dojo.require("dojo.widget.*");
dojo.require("dojo.widget.HtmlWidget");
dojo.require("dojo.html.style");
dojo.require("dojo.html.selection");
dojo.require("dojo.html.util");
dojo.require("dojo.event.*");


dojo.widget.defineWidget(
	"dojo.widget.FisheyeList",
	dojo.widget.HtmlWidget,
function(){
	/*
	 * summary
	 *	Menu similar to the fish eye menu on the Mac OS
	 * usage
	 *	<div dojoType="FisheyeList"
	 *	itemWidth="40" itemHeight="40"
	 *	itemMaxWidth="150" itemMaxHeight="150"
	 *	orientation="horizontal"
	 *	effectUnits="2"
	 *	itemPadding="10"
	 *	attachEdge="center"
	 *	labelEdge="bottom">
	 *
	 *		<div dojoType="FisheyeListItem"
	 *			id="item1"
	 *			onclick="alert('click on' + this.caption + '(from widget id ' + this.widgetId + ')!');"
	 *			caption="Item 1"
	 *			iconsrc="images/fisheye_1.png">
	 *		</div>
	 *		...
	 *	</div>
	 */

	this.pos = {x: -1, y: -1};		// current cursor position, relative to the grid

	this.EDGE = {
		CENTER: 0,
		LEFT: 1,
		RIGHT: 2,
		TOP: 3,
		BOTTOM: 4
	};

	// for conservative trigger mode, when triggered, timerScale is gradually increased from 0 to 1
	this.timerScale = 1.0;

},
{
	templateString: '<div class="dojoHtmlFisheyeListBar"></div>',
	templateCssPath: dojo.uri.dojoUri("src/widget/templates/FisheyeList.css"),

	isContainer: true,
	snarfChildDomOutput: true,

	// itemWidth: Integer
	//	width of menu item (in pixels) in it's dormant state (when the mouse is far away)
	itemWidth: 40,

	// itemHeight: Integer
	//	height of menu item (in pixels) in it's dormant state (when the mouse is far away)
	itemHeight: 40,

	// itemMaxWidth: Integer
	//	width of menu item (in pixels) in it's fully enlarged state (when the mouse is directly over it)
	itemMaxWidth: 150,

	// itemMaxHeight: Integer
	//	height of menu item (in pixels) in it's fully enlarged state (when the mouse is directly over it)
	itemMaxHeight: 150,


	// orientation: String
	//	orientation of the menu, either "horizontal" or "vertical"
	orientation: 'horizontal',

	// conservativeTrigger: Boolean
	//	if true, don't start enlarging menu items until mouse is over an image;
	//	if false, start enlarging menu items as the mouse moves near them.
	conservativeTrigger: false,

	// effectUnits: Number
	//	controls how much reaction the menu makes, relative to the distance of the mouse from the menu
	effectUnits: 2,

	// itemPadding: Integer
	//	padding (in pixels) betweeen each menu item
	itemPadding: 10,

	// attachEdge: String
	//	controls the border that the menu items don't expand past;
	//	for example, if set to "top", then the menu items will drop downwards as they expand.
	// values
	//	"center", "left", "right", "top", "bottom".
	attachEdge: 'center',

	// labelEdge: String
	//	controls were the labels show up in relation to the menu item icons
	// values
	//	"center", "left", "right", "top", "bottom".
	labelEdge: 'bottom',

	// enableCrappySvgSupportBoolean
	//	for browsers that support svg, use the svg image (specified in FisheyeListIem.svgSrc)
	//	rather than the iconSrc image attribute
	enableCrappySvgSupport: false,

	fillInTemplate: function() {
		dojo.html.disableSelection(this.domNode);

		this.isHorizontal = (this.orientation == 'horizontal');
		this.selectedNode = -1;

		this.isOver = false;
		this.hitX1 = -1;
		this.hitY1 = -1;
		this.hitX2 = -1;
		this.hitY2 = -1;

		//
		// only some edges make sense...
		//
		this.anchorEdge = this._toEdge(this.attachEdge, this.EDGE.CENTER);
		this.labelEdge  = this._toEdge(this.labelEdge,  this.EDGE.TOP);

		if ( this.isHorizontal && (this.anchorEdge == this.EDGE.LEFT  )){ this.anchorEdge = this.EDGE.CENTER; }
		if ( this.isHorizontal && (this.anchorEdge == this.EDGE.RIGHT )){ this.anchorEdge = this.EDGE.CENTER; }
		if (!this.isHorizontal && (this.anchorEdge == this.EDGE.TOP   )){ this.anchorEdge = this.EDGE.CENTER; }
		if (!this.isHorizontal && (this.anchorEdge == this.EDGE.BOTTOM)){ this.anchorEdge = this.EDGE.CENTER; }

		if (this.labelEdge == this.EDGE.CENTER){ this.labelEdge = this.EDGE.TOP; }
		if ( this.isHorizontal && (this.labelEdge == this.EDGE.LEFT  )){ this.labelEdge = this.EDGE.TOP; }
		if ( this.isHorizontal && (this.labelEdge == this.EDGE.RIGHT )){ this.labelEdge = this.EDGE.TOP; }
		if (!this.isHorizontal && (this.labelEdge == this.EDGE.TOP   )){ this.labelEdge = this.EDGE.LEFT; }
		if (!this.isHorizontal && (this.labelEdge == this.EDGE.BOTTOM)){ this.labelEdge = this.EDGE.LEFT; }

		//
		// figure out the proximity size
		//
		this.proximityLeft   = this.itemWidth  * (this.effectUnits - 0.5);
		this.proximityRight  = this.itemWidth  * (this.effectUnits - 0.5);
		this.proximityTop    = this.itemHeight * (this.effectUnits - 0.5);
		this.proximityBottom = this.itemHeight * (this.effectUnits - 0.5);

		if (this.anchorEdge == this.EDGE.LEFT){
			this.proximityLeft = 0;
		}
		if (this.anchorEdge == this.EDGE.RIGHT){
			this.proximityRight = 0;
		}
		if (this.anchorEdge == this.EDGE.TOP){
			this.proximityTop = 0;
		}
		if (this.anchorEdge == this.EDGE.BOTTOM){
			this.proximityBottom = 0;
		}
		if (this.anchorEdge == this.EDGE.CENTER){
			this.proximityLeft   /= 2;
			this.proximityRight  /= 2;
			this.proximityTop    /= 2;
			this.proximityBottom /= 2;
		}
	},

	postCreate: function() {
		this._initializePositioning();

		//
		// in liberal trigger mode, activate menu whenever mouse is close
		//
		if( !this.conservativeTrigger ){
			dojo.event.connect(document.documentElement, "onmousemove", this, "_onMouseMove");
		}

		// Deactivate the menu if mouse is moved off screen (doesn't work for FF?)
		dojo.event.connect(document.documentElement, "onmouseout", this, "_onBodyOut");
		dojo.event.connect(this, "addChild", this, "_initializePositioning");
	},

	_initializePositioning: function(){
		this.itemCount = this.children.length;

		this.barWidth  = (this.isHorizontal ? this.itemCount : 1) * this.itemWidth;
		this.barHeight = (this.isHorizontal ? 1 : this.itemCount) * this.itemHeight;

		this.totalWidth  = this.proximityLeft + this.proximityRight  + this.barWidth;
		this.totalHeight = this.proximityTop  + this.proximityBottom + this.barHeight;

		//
		// calculate effect ranges for each item
		//
		for (var i=0; i<this.children.length; i++){

			this.children[i].posX = this.itemWidth  * (this.isHorizontal ? i : 0);
			this.children[i].posY = this.itemHeight * (this.isHorizontal ? 0 : i);

			this.children[i].cenX = this.children[i].posX + (this.itemWidth  / 2);
			this.children[i].cenY = this.children[i].posY + (this.itemHeight / 2);

			var isz = this.isHorizontal ? this.itemWidth : this.itemHeight;
			var r = this.effectUnits * isz;
			var c = this.isHorizontal ? this.children[i].cenX : this.children[i].cenY;
			var lhs = this.isHorizontal ? this.proximityLeft : this.proximityTop;
			var rhs = this.isHorizontal ? this.proximityRight : this.proximityBottom;
			var siz = this.isHorizontal ? this.barWidth : this.barHeight;

			var range_lhs = r;
			var range_rhs = r;

			if (range_lhs > c+lhs){ range_lhs = c+lhs; }
			if (range_rhs > (siz-c+rhs)){ range_rhs = siz-c+rhs; }

			this.children[i].effectRangeLeft = range_lhs / isz;
			this.children[i].effectRangeRght = range_rhs / isz;

			//dojo.debug('effect range for '+i+' is '+range_lhs+'/'+range_rhs);
		}

		//
		// create the bar
		//
		this.domNode.style.width = this.barWidth + 'px';
		this.domNode.style.height = this.barHeight + 'px';

		//
		// position the items
		//
		for (var i=0; i<this.children.length; i++){
			var itm = this.children[i];
			var elm = itm.domNode;
			elm.style.left   = itm.posX + 'px';
			elm.style.top    = itm.posY + 'px';
			elm.style.width  = this.itemWidth + 'px';
			elm.style.height = this.itemHeight + 'px';

			if ( itm.svgNode ) {
				itm.svgNode.style.position = 'absolute';
				itm.svgNode.style.left = this.itemPadding+'%';
				itm.svgNode.style.top = this.itemPadding+'%';
				itm.svgNode.style.width = (100 - 2 * this.itemPadding) + '%';
				itm.svgNode.style.height = (100 - 2 * this.itemPadding) + '%';
				itm.svgNode.style.zIndex = 1;

				itm.svgNode.setSize(this.itemWidth, this.itemHeight);
			} else {
				itm.imgNode.style.left = this.itemPadding+'%';
				itm.imgNode.style.top = this.itemPadding+'%';
				itm.imgNode.style.width = (100 - 2 * this.itemPadding) + '%';
				itm.imgNode.style.height = (100 - 2 * this.itemPadding) + '%';
			}
		}

		//
		// calc the grid
		//
		this._calcHitGrid();
	},

	_onBodyOut: function(/*Event*/ e){
		// clicking over an object inside of body causes this event to fire; ignore that case
		if( dojo.html.overElement(dojo.body(), e) ){
			return;
		}
		this._setDormant(e);
	},

	_setDormant: function(/*Event*/ e){
		// summary: called when mouse moves out of menu's range

		if( !this.isOver ){ return; }	// already dormant?
		this.isOver = false;

		if ( this.conservativeTrigger ) {
			// user can't re-trigger the menu expansion
			// until he mouses over a icon again
			dojo.event.disconnect(document.documentElement, "onmousemove", this, "_onMouseMove");
		}
		this._onGridMouseMove(-1, -1);
	},

	_setActive: function(/*Event*/ e){
		// summary: called when mouse is moved into menu's range

		if( this.isOver ){ return; }	// already activated?
		this.isOver = true;

		if ( this.conservativeTrigger ) {
			// switch event handlers so that we handle mouse events from anywhere near
			// the menu
			dojo.event.connect(document.documentElement, "onmousemove", this, "_onMouseMove");

			this.timerScale=0.0;

			// call mouse handler to do some initial necessary calculations/positioning
			this._onMouseMove(e);

			// slowly expand the icon size so it isn't jumpy
			this._expandSlowly();
		}
	},

	_onMouseMove: function(/*Event*/ e) {
		// summary: called when mouse is moved
		if ((e.pageX >= this.hitX1) && (e.pageX <= this.hitX2) &&
			(e.pageY >= this.hitY1) && (e.pageY <= this.hitY2)){
			if( !this.isOver ){
				this._setActive(e);
			}
			this._onGridMouseMove(e.pageX-this.hitX1, e.pageY-this.hitY1);
		}else{
			if (this.isOver){
				this._setDormant(e);
			}
		}
	},

	onResized: function() {
		this._calcHitGrid();
	},

	_onGridMouseMove: function(x, y){
		// summary: called when mouse is moved in the vicinity of the menu
		this.pos = {x:x, y:y};
		this._paint();
	},

	_paint: function(){
		var x=this.pos.x;
		var y=this.pos.y;

		if( this.itemCount <= 0 ){ return; }

		//
		// figure out our main index
		//
		var pos = this.isHorizontal ? x : y;
		var prx = this.isHorizontal ? this.proximityLeft : this.proximityTop;
		var siz = this.isHorizontal ? this.itemWidth : this.itemHeight;
		var sim = this.isHorizontal ?
			(1.0-this.timerScale)*this.itemWidth + this.timerScale*this.itemMaxWidth :
			(1.0-this.timerScale)*this.itemHeight + this.timerScale*this.itemMaxHeight ;

		var cen = ((pos - prx) / siz) - 0.5;
		var max_off_cen = (sim / siz) - 0.5;

		if (max_off_cen > this.effectUnits){ max_off_cen = this.effectUnits; }

		//
		// figure out our off-axis weighting
		//
		var off_weight = 0;

		if (this.anchorEdge == this.EDGE.BOTTOM){
			var cen2 = (y - this.proximityTop) / this.itemHeight;
			off_weight = (cen2 > 0.5) ? 1 : y / (this.proximityTop + (this.itemHeight / 2));
		}
		if (this.anchorEdge == this.EDGE.TOP){
			var cen2 = (y - this.proximityTop) / this.itemHeight;
			off_weight = (cen2 < 0.5) ? 1 : (this.totalHeight - y) / (this.proximityBottom + (this.itemHeight / 2));
		}
		if (this.anchorEdge == this.EDGE.RIGHT){
			var cen2 = (x - this.proximityLeft) / this.itemWidth;
			off_weight = (cen2 > 0.5) ? 1 : x / (this.proximityLeft + (this.itemWidth / 2));
		}
		if (this.anchorEdge == this.EDGE.LEFT){
			var cen2 = (x - this.proximityLeft) / this.itemWidth;
			off_weight = (cen2 < 0.5) ? 1 : (this.totalWidth - x) / (this.proximityRight + (this.itemWidth / 2));
		}
		if (this.anchorEdge == this.EDGE.CENTER){
			if (this.isHorizontal){
				off_weight = y / (this.totalHeight);
			}else{
				off_weight = x / (this.totalWidth);
			}

			if (off_weight > 0.5){
				off_weight = 1 - off_weight;
			}

			off_weight *= 2;
		}

		//
		// set the sizes
		//
		for(var i=0; i<this.itemCount; i++){
			var weight = this._weighAt(cen, i);
			if (weight < 0){weight = 0;}
			this._setItemSize(i, weight * off_weight);
		}

		//
		// set the positions
		//

		var main_p = Math.round(cen);
		var offset = 0;

		if (cen < 0){
			main_p = 0;

		}else if (cen > this.itemCount - 1){

			main_p = this.itemCount -1;

		}else{

			offset = (cen - main_p) * ((this.isHorizontal ? this.itemWidth : this.itemHeight) - this.children[main_p].sizeMain);
		}

		this._positionElementsFrom(main_p, offset);
	},

	_weighAt: function(/*Integer*/ cen, /*Integer*/ i){
		var dist = Math.abs(cen - i);
		var limit = ((cen - i) > 0) ? this.children[i].effectRangeRght : this.children[i].effectRangeLeft;
		return (dist > limit) ? 0 : (1 - dist / limit);			// Integer
	},

	_setItemSize: function(p, scale){
		scale *= this.timerScale;
		var w = Math.round(this.itemWidth  + ((this.itemMaxWidth  - this.itemWidth ) * scale));
		var h = Math.round(this.itemHeight + ((this.itemMaxHeight - this.itemHeight) * scale));

		if (this.isHorizontal){

			this.children[p].sizeW = w;
			this.children[p].sizeH = h;

			this.children[p].sizeMain = w;
			this.children[p].sizeOff  = h;

			var y = 0;
			if (this.anchorEdge == this.EDGE.TOP){
				y = (this.children[p].cenY - (this.itemHeight / 2));
			}else if (this.anchorEdge == this.EDGE.BOTTOM){
				y = (this.children[p].cenY - (h - (this.itemHeight / 2)));
			}else{
				y = (this.children[p].cenY - (h / 2));
			}

			this.children[p].usualX = Math.round(this.children[p].cenX - (w / 2));
			this.children[p].domNode.style.top  = y + 'px';
			this.children[p].domNode.style.left  = this.children[p].usualX + 'px';

		}else{

			this.children[p].sizeW = w;
			this.children[p].sizeH = h;

			this.children[p].sizeOff  = w;
			this.children[p].sizeMain = h;

			var x = 0;
			if (this.anchorEdge == this.EDGE.LEFT){
				x = this.children[p].cenX - (this.itemWidth / 2);
			}else if (this.anchorEdge == this.EDGE.RIGHT){
				x = this.children[p].cenX - (w - (this.itemWidth / 2));
			}else{
				x = this.children[p].cenX - (w / 2);
			}

			this.children[p].domNode.style.left = x + 'px';
			this.children[p].usualY = Math.round(this.children[p].cenY - (h / 2));

			this.children[p].domNode.style.top  = this.children[p].usualY + 'px';
		}

		this.children[p].domNode.style.width  = w + 'px';
		this.children[p].domNode.style.height = h + 'px';

		if (this.children[p].svgNode){
			this.children[p].svgNode.setSize(w, h);
		}
	},

	_positionElementsFrom: function(p, offset){

		var pos = 0;

		if (this.isHorizontal){
			pos = Math.round(this.children[p].usualX + offset);
			this.children[p].domNode.style.left = pos + 'px';
		}else{
			pos = Math.round(this.children[p].usualY + offset);
			this.children[p].domNode.style.top = pos + 'px';
		}
		this._positionLabel(this.children[p]);


		//
		// position before
		//
		var bpos = pos;
		for(var i=p-1; i>=0; i--){
			bpos -= this.children[i].sizeMain;

			if (this.isHorizontal){
				this.children[i].domNode.style.left = bpos + 'px';
			}else{
				this.children[i].domNode.style.top = bpos + 'px';
			}
			this._positionLabel(this.children[i]);
		}

		//
		// position after
		//
		var apos = pos;
		for(var i=p+1; i<this.itemCount; i++){
			apos += this.children[i-1].sizeMain;

			if (this.isHorizontal){
				this.children[i].domNode.style.left = apos + 'px';
			}else{
				this.children[i].domNode.style.top = apos + 'px';
			}
			this._positionLabel(this.children[i]);
		}

	},

	_positionLabel: function(itm){

		var x = 0;
		var y = 0;

		var mb = dojo.html.getMarginBox(itm.lblNode);

		if (this.labelEdge == this.EDGE.TOP){
			x = Math.round((itm.sizeW / 2) - (mb.width / 2));
			y = -mb.height;
		}

		if (this.labelEdge == this.EDGE.BOTTOM){
			x = Math.round((itm.sizeW / 2) - (mb.width / 2));
			y = itm.sizeH;
		}

		if (this.labelEdge == this.EDGE.LEFT){
			x = -mb.width;
			y = Math.round((itm.sizeH / 2) - (mb.height / 2));
		}

		if (this.labelEdge == this.EDGE.RIGHT){
			x = itm.sizeW;
			y = Math.round((itm.sizeH / 2) - (mb.height / 2));
		}

		itm.lblNode.style.left = x + 'px';
		itm.lblNode.style.top  = y + 'px';
	},

	_calcHitGrid: function(){

		var pos = dojo.html.getAbsolutePosition(this.domNode, true);

		this.hitX1 = pos.x - this.proximityLeft;
		this.hitY1 = pos.y - this.proximityTop;
		this.hitX2 = this.hitX1 + this.totalWidth;
		this.hitY2 = this.hitY1 + this.totalHeight;

		//dojo.debug(this.hitX1+','+this.hitY1+' // '+this.hitX2+','+this.hitY2);
	},

	_toEdge: function(inp, def){
		return this.EDGE[inp.toUpperCase()] || def;
	},

	_expandSlowly: function(){
		// summary: slowly expand the image to user specified max size
		if( !this.isOver ){ return; }
		this.timerScale += 0.2;
		this._paint();
		if ( this.timerScale<1.0 ) {
			dojo.lang.setTimeout(this, "_expandSlowly", 10);
		}
	},

	destroy: function(){
		// need to disconnect when we destroy
		dojo.event.disconnect(document.documentElement, "onmouseout", this, "_onBodyOut");
		dojo.event.disconnect(document.documentElement, "onmousemove", this, "_onMouseMove");
		dojo.widget.FisheyeList.superclass.destroy.call(this);
	}
});

dojo.widget.defineWidget(
	"dojo.widget.FisheyeListItem",
	dojo.widget.HtmlWidget,
{
	/*
	 * summary
	 *	Menu item inside of a FisheyeList.
	 *	See FisheyeList documentation for details on usage.
	 */

	// iconSrc: String
	//	pathname to image file (jpg, gif, png, etc.) of icon for this menu item
	iconSrc: "",

	// svgSrc: String
	//	pathname to svg file of icon for this menu item
	svgSrc: "",

	// caption: String
	//	label to print next to the icon, when it is moused-over
	caption: "",

	// id: String
	//	will be set to the id of the orginal div element
	id: "",

	_blankImgPath: dojo.uri.dojoUri("src/widget/templates/images/blank.gif"),

	templateString:
		'<div class="dojoHtmlFisheyeListItem">' +
		'  <img class="dojoHtmlFisheyeListItemImage" dojoAttachPoint="imgNode" dojoAttachEvent="onMouseOver;onMouseOut;onClick">' +
		'  <div class="dojoHtmlFisheyeListItemLabel" dojoAttachPoint="lblNode"></div>' +
		'</div>',

	fillInTemplate: function() {
		//
		// set image
		// TODO: turn on/off SVG support based on browser version.
		// this.parent.enableCrappySvgSupport is not available to this function
		//
		if (this.svgSrc != ""){
			this.svgNode = this._createSvgNode(this.svgSrc);
			this.domNode.appendChild(this.svgNode);
			this.imgNode.style.display = 'none';
		} else if((this.iconSrc.toLowerCase().substring(this.iconSrc.length-4)==".png")&&(dojo.render.html.ie)&&(!dojo.render.html.ie70)){
			/* we set the id of the new fisheyeListItem to the id of the div defined in the HTML */
			if (dojo.dom.hasParent(this.imgNode) && this.id != ""){
				var parent = this.imgNode.parentNode;
				parent.setAttribute("id", this.id);
			}
			this.imgNode.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='"+this.iconSrc+"', sizingMethod='scale')";
			this.imgNode.src = this._blankImgPath.toString();
		} else {
			if (dojo.dom.hasParent(this.imgNode) && this.id != ""){
				var parent = this.imgNode.parentNode;
				parent.setAttribute("id", this.id);
			}
			this.imgNode.src = this.iconSrc;
		}

		//
		// Label
		//
		if ( this.lblNode ) {
			this.lblNode.appendChild(document.createTextNode(this.caption));
		}
		dojo.html.disableSelection(this.domNode);
	},

	_createSvgNode: function(src){
		var elm = document.createElement('embed');
		elm.src = src;
		elm.type = 'image/svg+xml';
		//elm.style.border = '1px solid black';
		elm.style.width = '1px';
		elm.style.height = '1px';
		elm.loaded = 0;
		elm.setSizeOnLoad = false;

		elm.onload = function(){
			this.svgRoot = this.getSVGDocument().rootElement;
			this.svgDoc = this.getSVGDocument().documentElement;
			this.zeroWidth = this.svgRoot.width.baseVal.value;
			this.zeroHeight = this.svgRoot.height.baseVal.value;
			this.loaded = true;

			if (this.setSizeOnLoad){
				this.setSize(this.setWidth, this.setHeight);
			}
		}

		elm.setSize = function(w, h){
			if (!this.loaded){
				this.setWidth = w;
				this.setHeight = h;
				this.setSizeOnLoad = true;
				return;
			}

			this.style.width = w+'px';
			this.style.height = h+'px';
			this.svgRoot.width.baseVal.value = w;
			this.svgRoot.height.baseVal.value = h;

			var scale_x = w / this.zeroWidth;
			var scale_y = h / this.zeroHeight;

			for(var i=0; i<this.svgDoc.childNodes.length; i++){
				if (this.svgDoc.childNodes[i].setAttribute){
					this.svgDoc.childNodes[i].setAttribute( "transform", "scale("+scale_x+","+scale_y+")" );
				}
			}
		}

		return elm;
	},

	onMouseOver: function(/*Event*/ e) {
		// summary: callback when user moves mouse over this menu item
		// in conservative mode, don't activate the menu until user mouses over an icon
		if( !this.parent.isOver ){
			this.parent._setActive(e);
		}
		if ( this.caption != "" ) {
			dojo.html.addClass(this.lblNode, "selected");
			this.parent._positionLabel(this);
		}
	},

	onMouseOut: function(/*Event*/ e) {
		// summary: callback when user moves mouse off of this menu item
		dojo.html.removeClass(this.lblNode, "selected");
	},

	onClick: function(/*Event*/ e) {
		// summary: user overridable callback when user clicks this menu item
	}
});