define([
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"require", // require, require.toUrl
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"./_base/config", // config.blankGif
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"./dom-class", // domClass.add
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"./dom-style", // domStyle.getComputedStyle
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"./has",
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"./domReady",
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"./_base/window" // win.body
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], function(require, config, domClass, domStyle, has, domReady, win){
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// module:
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// dojo/hccss
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/*=====
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return function(){
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// summary:
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// Test if computer is in high contrast mode (i.e. if browser is not displaying background images).
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// Defines `has("highcontrast")` and sets `dj_a11y` CSS class on `<body>` if machine is in high contrast mode.
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// Returns `has()` method;
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};
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=====*/
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// Has() test for when background images aren't displayed. Don't call has("highcontrast") before dojo/domReady!.
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has.add("highcontrast", function(){
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// note: if multiple documents, doesn't matter which one we use
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var div = win.doc.createElement("div");
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div.style.cssText = "border: 1px solid; border-color:red green; position: absolute; height: 5px; top: -999px;" +
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"background-image: url(\"" + (config.blankGif || require.toUrl("./resources/blank.gif")) + "\");";
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win.body().appendChild(div);
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var cs = domStyle.getComputedStyle(div),
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bkImg = cs.backgroundImage,
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hc = (cs.borderTopColor == cs.borderRightColor) ||
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(bkImg && (bkImg == "none" || bkImg == "url(invalid-url:)" ));
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if(has("ie") <= 8){
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div.outerHTML = ""; // prevent mixed-content warning, see http://support.microsoft.com/kb/925014
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}else{
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win.body().removeChild(div);
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}
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return hc;
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});
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domReady(function(){
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if(has("highcontrast")){
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domClass.add(win.body(), "dj_a11y");
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}
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});
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return has;
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});
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