lib/dojo/hccss.js.uncompressed.js

   1 define("dojo/hccss", [
   2         "require",                      // require.toUrl
   3         "./_base/config", // config.blankGif
   4         "./dom-class", // domClass.add
   5         "./dom-style", // domStyle.getComputedStyle
   6         "./has",
   7         "./ready", // ready
   8         "./_base/window" // win.body
   9 ], function(require, config, domClass, domStyle, has, ready, win){
  10
  11         // module:
  12         //              dojo/hccss
  13
  14         /*=====
  15         return function(){
  16                 // summary:
  17                 //              Test if computer is in high contrast mode (i.e. if browser is not displaying background images).
  18                 //              Defines `has("highcontrast")` and sets `dj_a11y` CSS class on `<body>` if machine is in high contrast mode.
  19                 //              Returns `has()` method;
  20         };
  21         =====*/
  22
  23         // Has() test for when background images aren't displayed.  Don't call has("highcontrast") before dojo/domReady!.
  24         has.add("highcontrast", function(){
  25                 // note: if multiple documents, doesn't matter which one we use
  26                 var div = win.doc.createElement("div");
  27                 div.style.cssText = "border: 1px solid; border-color:red green; position: absolute; height: 5px; top: -999px;" +
  28                         "background-image: url(" + (config.blankGif || require.toUrl("./resources/blank.gif")) + ");";
  29                 win.body().appendChild(div);
  30
  31                 var cs = domStyle.getComputedStyle(div),
  32                         bkImg = cs.backgroundImage,
  33                         hc = (cs.borderTopColor == cs.borderRightColor) ||
  34                                 (bkImg && (bkImg == "none" || bkImg == "url(invalid-url:)" ));
  35
  36                 if(has("ie") <= 8){
  37                         div.outerHTML = "";             // prevent mixed-content warning, see http://support.microsoft.com/kb/925014
  38                 }else{
  39                         win.body().removeChild(div);
  40                 }
  41
  42                 return hc;
  43         });
  44
  45         // Priority is 90 to run ahead of parser priority of 100.   For 2.0, remove the ready() call and instead
  46         // change this module to depend on dojo/domReady!
  47         ready(90, function(){
  48                 if(has("highcontrast")){
  49                         domClass.add(win.body(), "dj_a11y");
  50                 }
  51         });
  52
  53         return has;
  54 });