| 1 | define([ |
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| 2 | "require", // require, require.toUrl |
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| 3 | "./_base/config", // config.blankGif |
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| 4 | "./dom-class", // domClass.add |
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| 5 | "./dom-style", // domStyle.getComputedStyle |
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| 6 | "./has", |
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| 7 | "./domReady", |
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| 8 | "./_base/window" // win.body |
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| 9 | ], function(require, config, domClass, domStyle, has, domReady, win){ |
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| 10 | |
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| 11 | // module: |
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| 12 | // dojo/hccss |
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| 13 | |
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| 14 | /*===== |
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| 15 | return function(){ |
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| 16 | // summary: |
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| 17 | // Test if computer is in high contrast mode (i.e. if browser is not displaying background images). |
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| 18 | // Defines `has("highcontrast")` and sets `dj_a11y` CSS class on `<body>` if machine is in high contrast mode. |
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| 19 | // Returns `has()` method; |
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| 20 | }; |
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| 21 | =====*/ |
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| 22 | |
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| 23 | // Has() test for when background images aren't displayed. Don't call has("highcontrast") before dojo/domReady!. |
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| 24 | has.add("highcontrast", function(){ |
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| 25 | // note: if multiple documents, doesn't matter which one we use |
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| 26 | var div = win.doc.createElement("div"); |
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| 27 | div.style.cssText = "border: 1px solid; border-color:red green; position: absolute; height: 5px; top: -999px;" + |
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| 28 | "background-image: url(" + (config.blankGif || require.toUrl("./resources/blank.gif")) + ");"; |
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| 29 | win.body().appendChild(div); |
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| 30 | |
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| 31 | var cs = domStyle.getComputedStyle(div), |
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| 32 | bkImg = cs.backgroundImage, |
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| 33 | hc = (cs.borderTopColor == cs.borderRightColor) || |
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| 34 | (bkImg && (bkImg == "none" || bkImg == "url(invalid-url:)" )); |
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| 35 | |
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| 36 | if(has("ie") <= 8){ |
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| 37 | div.outerHTML = ""; // prevent mixed-content warning, see http://support.microsoft.com/kb/925014 |
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| 38 | }else{ |
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| 39 | win.body().removeChild(div); |
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| 40 | } |
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| 41 | |
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| 42 | return hc; |
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| 43 | }); |
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| 44 | |
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| 45 | domReady(function(){ |
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| 46 | if(has("highcontrast")){ |
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| 47 | domClass.add(win.body(), "dj_a11y"); |
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| 48 | } |
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| 49 | }); |
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| 50 | |
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| 51 | return has; |
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| 52 | }); |
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