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dojo
/
hccss.js

define([
	"require",			// require, require.toUrl
	"./_base/config", // config.blankGif
	"./dom-class", // domClass.add
	"./dom-style", // domStyle.getComputedStyle
	"./has",
	"./domReady",
	"./_base/window" // win.body
], function(require, config, domClass, domStyle, has, domReady, win){

	// module:
	//		dojo/hccss

	/*=====
	return function(){
		// summary:
		//		Test if computer is in high contrast mode (i.e. if browser is not displaying background images).
		//		Defines `has("highcontrast")` and sets `dj_a11y` CSS class on `<body>` if machine is in high contrast mode.
		//		Returns `has()` method;
	};
	=====*/

	// Has() test for when background images aren't displayed.  Don't call has("highcontrast") before dojo/domReady!.
	has.add("highcontrast", function(){
		// note: if multiple documents, doesn't matter which one we use
		var div = win.doc.createElement("div");
		try{
			div.style.cssText = "border: 1px solid; border-color:red green; position: absolute; height: 5px; top: -999px;" +
				"background-image: url(\"" + (config.blankGif || require.toUrl("./resources/blank.gif")) + "\");";
			win.body().appendChild(div);

			var cs = domStyle.getComputedStyle(div),
				bkImg = cs.backgroundImage;
			return cs.borderTopColor == cs.borderRightColor ||
				(bkImg && (bkImg == "none" || bkImg == "url(invalid-url:)" ));
		}catch(e){
			console.warn("hccss: exception detecting high-contrast mode, document is likely hidden: " + e.toString());
			return false;
		}finally{
			if(has("ie") <= 8){
				div.outerHTML = "";		// prevent mixed-content warning, see http://support.microsoft.com/kb/925014
			}else{
				win.body().removeChild(div);
			}
		}
	});

	domReady(function(){
		if(has("highcontrast")){
			domClass.add(win.body(), "dj_a11y");
		}
	});

	return has;
});