dojo_app/js/library/dojox/gfx/renderer.js

define(["./_base","dojo/_base/lang", "dojo/_base/sniff", "dojo/_base/window", "dojo/_base/config"],
  function(g, lang, has, win, config){
  //>> noBuildResolver
	var currentRenderer = null;

	has.add("vml", function(global, document, element){
		element.innerHTML = "<v:shape adj=\"1\"/>";
		var supported = ("adj" in element.firstChild);
		element.innerHTML = "";
		return supported;
	});

	return {
		// summary:
		//		This module is an AMD loader plugin that loads the appropriate graphics renderer
		//		implementation based on detected environment and current configuration settings.
		
		load: function(id, require, load){
			// tags:
			//      private
			if(currentRenderer && id != "force"){
				load(currentRenderer);
				return;
			}
			var renderer = config.forceGfxRenderer,
				renderers = !renderer && (lang.isString(config.gfxRenderer) ?
					config.gfxRenderer : "svg,vml,canvas,silverlight").split(","),
				silverlightObject, silverlightFlag;

			while(!renderer && renderers.length){
				switch(renderers.shift()){
					case "svg":
						// the next test is from https://github.com/phiggins42/has.js
						if("SVGAngle" in win.global){
							renderer = "svg";
						}
						break;
					case "vml":
						if(has("vml")){
							renderer = "vml";
						}
						break;
					case "silverlight":
						try{
							if(has("ie")){
								silverlightObject = new ActiveXObject("AgControl.AgControl");
								if(silverlightObject && silverlightObject.IsVersionSupported("1.0")){
									silverlightFlag = true;
								}
							}else{
								if(navigator.plugins["Silverlight Plug-In"]){
									silverlightFlag = true;
								}
							}
						}catch(e){
							silverlightFlag = false;
						}finally{
							silverlightObject = null;
						}
						if(silverlightFlag){
							renderer = "silverlight";
						}
						break;
					case "canvas":
						if(win.global.CanvasRenderingContext2D){
							renderer = "canvas";
						}
						break;
				}
			}

			if (renderer === 'canvas' && config.canvasEvents !== false) {
				renderer = "canvasWithEvents";
			}

			if(config.isDebug){
				console.log("gfx renderer = " + renderer);
			}

			function loadRenderer(){
				require(["dojox/gfx/" + renderer], function(module){
					g.renderer = renderer;
					// memorize the renderer module
					currentRenderer = module;
					// now load it
					load(module);
				});
			}
			if(renderer == "svg" && typeof window.svgweb != "undefined"){
				window.svgweb.addOnLoad(loadRenderer);
			}else{
				loadRenderer();
			}
		}
	};
});