fisheyelist.js

dojo与json创建无限级树的时候,当在父结点下添加了一个新结点,我怎么让父亲结点重新调用json加载一下子结点内容.

/*
	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");
dojo.provide("dojo.widget.html.FisheyeList");
dojo.provide("dojo.widget.html.FisheyeListItem");

//
// 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.dom");
dojo.require("dojo.html");
dojo.require("dojo.style");
dojo.require("dojo.event");

dojo.widget.tags.addParseTreeHandler("dojo:FisheyeList");
dojo.widget.tags.addParseTreeHandler("dojo:FisheyeListItem");

dojo.widget.html.FisheyeList = function(){
	dojo.widget.HtmlWidget.call(this);
}
dojo.inherits(dojo.widget.html.FisheyeList, dojo.widget.HtmlWidget);

dojo.lang.extend(dojo.widget.html.FisheyeList, {

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

	EDGE: {
		CENTER: 0,
		LEFT: 1,
		RIGHT: 2,
		TOP: 3,
		BOTTOM: 4
	},

	isContainer: true,
	snarfChildDomOutput: true,
	
	pos: {x: -1, y: -1},		// current cursor position, relative to the grid
	
	// for conservative trigger mode, when triggered, timerScale is gradually increased from 0 to 1
	timerScale: 1.0,

	/////////////////////////////////////////////////////////////////
	//
	// i spy OPTIONS!!!!
	//

	itemWidth: 40,
	itemHeight: 40,

	itemMaxWidth: 150,
	itemMaxHeight: 150,

	orientation: 'horizontal',
	
	conservativeTrigger: false,		// don't active menu until mouse is over an image (macintosh style)

	effectUnits: 2,
	itemPadding: 10,

	attachEdge: 'center',
	labelEdge: 'bottom',

	enableCrappySvgSupport: false,


	//
	//
	//
	/////////////////////////////////////////////////////////////////

	fillInTemplate: function(args, frag) {
		//dojo.debug(this.orientation);

		dojo.html.disableSelection(this.domNode);

		this.isHorizontal = (this.orientation == 'horizontal') ? 1 : 0;
		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(args, frag) {
		this.initializePositioning();

		//
		// in liberal trigger mode, activate menu whenever mouse is close
		//
		if( !this.conservativeTrigger ){
			dojo.event.connect(document.documentElement, "onmousemove", this, "mouseHandler");
		}
		
		// 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(e){
		// clicking over an object inside of body causes this event to fire; ignore that case
		if( dojo.html.overElement(document.body, e) ){
			return;
		}
		this.setDormant(e);
	},

	// when mouse moves out of menu's range
	setDormant: function(e){
		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, "mouseHandler");
		}
		this.onGridMouseMove(-1, -1);
	},

	// when mouse is moved into menu's range
	setActive: function(e){
		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, "mouseHandler");

			this.timerScale=0.0;

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

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

	// when mouse is moved
	mouseHandler: function(e) {
		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){
		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;
		}