dojo_app/js/library/dojox/treemap/ScaledLabel.js

define(["dojo/_base/declare", "dojo/dom-geometry", "dojo/dom-construct", "dojo/dom-style"],
	function(declare, domGeom, domConstruct, domStyle) {

	return declare("dojox.treemap.ScaledLabel", null, {
		// summary:
		//		Specializes TreeMap to display scaled leaf labels instead of constant size labels.

		onRendererUpdated: function(evt){
			if(evt.kind == "leaf"){
				var renderer = evt.renderer;
				// start back with default size
				var oldSize = domStyle.get(renderer, "fontSize");
				domStyle.set(renderer.firstChild, "fontSize", oldSize);
				oldSize = parseInt(oldSize);
				var hRatio = 0.75 * domGeom.getContentBox(renderer).w / domGeom.getMarginBox(renderer.firstChild).w;
				var vRatio = domGeom.getContentBox(renderer).h  / domGeom.getMarginBox(renderer.firstChild).h;
				var hDiff = domGeom.getContentBox(renderer).w - domGeom.getMarginBox(renderer.firstChild).w;
				var vDiff = domGeom.getContentBox(renderer).h - domGeom.getMarginBox(renderer.firstChild).h;
				var newSize = Math.floor(oldSize * Math.min(hRatio, vRatio));
				while(vDiff > 0 && hDiff > 0){
					domStyle.set(renderer.firstChild, "fontSize", newSize + "px");
					hDiff = domGeom.getContentBox(renderer).w - domGeom.getMarginBox(renderer.firstChild).w;
					vDiff = domGeom.getContentBox(renderer).h - domGeom.getMarginBox(renderer.firstChild).h;
					oldSize = newSize;
					newSize += 1;
				}
				if(vDiff < 0 || hDiff < 0){
					// back track
					domStyle.set(renderer.firstChild, "fontSize", oldSize + "px");
				}
			}
		},

		createRenderer: function(item, level, kind){
			var renderer = this.inherited(arguments);
			if(kind == "leaf"){
				var p = domConstruct.create("div");
				domStyle.set(p, {
					"position": "absolute",
					"width": "auto"
				});
				domConstruct.place(p, renderer);
			}
			return renderer;
		},
		
		styleRenderer: function(renderer, item, level, kind){
			if (kind != "leaf"){
				this.inherited(arguments);
			}else{
				domStyle.set(renderer, "background", this.getColorForItem(item).toHex());
				renderer.firstChild.innerHTML = this.getLabelForItem(item);
			}
		}
	});
});