mirror of
https://github.com/Alfresco/alfresco-community-repo.git
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838e7d5381
git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@5282 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
104 lines
3.5 KiB
JavaScript
104 lines
3.5 KiB
JavaScript
/*
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Copyright (c) 2004-2006, The Dojo Foundation
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All Rights Reserved.
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Licensed under the Academic Free License version 2.1 or above OR the
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modified BSD license. For more information on Dojo licensing, see:
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http://dojotoolkit.org/community/licensing.shtml
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*/
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dojo.provide("dojo.a11y");
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dojo.require("dojo.uri.*");
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dojo.require("dojo.html.common");
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dojo.a11y = {
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// imgPath: String path to the test image for determining if images are displayed or not
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// doAccessibleCheck: Boolean if true will perform check for need to create accessible widgets
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// accessible: Boolean uninitialized when null (accessible check has not been performed)
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// if true generate accessible widgets
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imgPath:dojo.uri.dojoUri("src/widget/templates/images"),
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doAccessibleCheck: true,
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accessible: null,
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checkAccessible: function(){
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// summary:
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// perform check for accessibility if accessibility checking is turned
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// on and the accessibility test has not been performed yet
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if(this.accessible === null){
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this.accessible = false; //default
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if(this.doAccessibleCheck == true){
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this.accessible = this.testAccessible();
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}
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}
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return this.accessible; /* Boolean */
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},
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testAccessible: function(){
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// summary:
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// Always perform the accessibility check to determine if high
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// contrast mode is on or display of images are turned off. Currently only checks
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// in IE and Mozilla.
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this.accessible = false; //default
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if (dojo.render.html.ie || dojo.render.html.mozilla){
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var div = document.createElement("div");
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//div.style.color="rgb(153,204,204)";
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div.style.backgroundImage = "url(\"" + this.imgPath + "/tab_close.gif\")";
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// must add to hierarchy before can view currentStyle below
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dojo.body().appendChild(div);
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// in FF and IE the value for the current background style of the added div
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// will be "none" in high contrast mode
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// in FF the return value will be url(invalid-url:) when running over http
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var bkImg = null;
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if (window.getComputedStyle ) {
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var cStyle = getComputedStyle(div, "");
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bkImg = cStyle.getPropertyValue("background-image");
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}else{
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bkImg = div.currentStyle.backgroundImage;
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}
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var bUseImgElem = false;
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if (bkImg != null && (bkImg == "none" || bkImg == "url(invalid-url:)" )) {
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this.accessible = true;
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}
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/*
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if(this.accessible == false && document.images){
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// test if images are off in IE
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var testImg = new Image();
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if(testImg.fileSize) {
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testImg.src = this.imgPath + "/tab_close.gif";
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if(testImg.fileSize < 0){
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this.accessible = true;
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}
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}
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}*/
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dojo.body().removeChild(div);
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}
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return this.accessible; /* Boolean */
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},
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setCheckAccessible: function(/* Boolean */ bTest){
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// summary:
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// Set whether or not to check for accessibility mode. Default value
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// of module is true - perform check for accessibility modes.
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// bTest: Boolean - true to check; false to turn off checking
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this.doAccessibleCheck = bTest;
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},
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setAccessibleMode: function(){
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// summary:
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// perform the accessibility check and sets the correct mode to load
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// a11y widgets. Only runs if test for accessiiblity has not been performed yet.
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// Call testAccessible() to force the test.
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if (this.accessible === null){
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if (this.checkAccessible()){
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dojo.render.html.prefixes.unshift("a11y");
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}
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}
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return this.accessible; /* Boolean */
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}
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};
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//dojo.hostenv.modulesLoadedListeners.unshift(function() { dojo.a11y.setAccessibleMode(); });
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//dojo.event.connect("before", dojo.hostenv, "makeWidgets", dojo.a11y, "setAccessibleMode");
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