ui/accessibility/extensions/highcontrast/background.js

   1 // Copyright (c) 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 function injectContentScripts() {
   6   chrome.windows.getAll({'populate': true}, function(windows) {
   7     for (var i = 0; i < windows.length; i++) {
   8       var tabs = windows[i].tabs;
   9       for (var j = 0; j < tabs.length; j++) {
  10         var url = tabs[j].url;
  11         if (url.indexOf('chrome') == 0 || url.indexOf('about') == 0) {
  12           continue;
  13         }
  14         chrome.tabs.insertCSS(
  15             tabs[j].id,
  16             {file: 'highcontrast.css', allFrames: true});
  17         chrome.tabs.executeScript(
  18             tabs[j].id,
  19             {file: 'highcontrast.js', allFrames: true});
  20       }
  21     }
  22   });
  23 }
  24
  25 function updateTabs() {
  26   var msg = {
  27     'enabled': getEnabled()
  28   };
  29   chrome.windows.getAll({'populate': true}, function(windows) {
  30     for (var i = 0; i < windows.length; i++) {
  31       var tabs = windows[i].tabs;
  32       for (var j = 0; j < tabs.length; j++) {
  33         var url = tabs[j].url;
  34         if (isDisallowedUrl(url)) {
  35           continue;
  36         }
  37         var msg = {
  38           'enabled': getEnabled(),
  39           'scheme': getSiteScheme(siteFromUrl(url))
  40         };
  41         chrome.tabs.sendRequest(tabs[j].id, msg);
  42       }
  43     }
  44   });
  45 }
  46
  47 function toggleEnabled() {
  48   setEnabled(!getEnabled());
  49   updateTabs();
  50 }
  51
  52 function toggleSite(url) {
  53   var site = siteFromUrl(url);
  54   var scheme = getSiteScheme(site);
  55   if (scheme > 0) {
  56     scheme = 0;
  57   } else if (getDefaultScheme() > 0) {
  58     scheme = getDefaultScheme();
  59   } else {
  60     scheme = DEFAULT_SCHEME;
  61   }
  62   setSiteScheme(site, scheme);
  63   updateTabs();
  64 }
  65
  66 function init() {
  67   injectContentScripts();
  68   updateTabs();
  69
  70   chrome.extension.onRequest.addListener(
  71       function(request, sender, sendResponse) {
  72         if (request['toggle_global']) {
  73           toggleEnabled();
  74         }
  75         if (request['toggle_site']) {
  76           toggleSite(sender.tab ? sender.tab.url : 'www.example.com');
  77         }
  78         if (request['init']) {
  79           var scheme = getDefaultScheme();
  80           if (sender.tab) {
  81             scheme = getSiteScheme(siteFromUrl(sender.tab.url));
  82           }
  83           var msg = {
  84             'enabled': getEnabled(),
  85             'scheme': scheme
  86           };
  87           sendResponse(msg);
  88         }
  89       });
  90
  91   document.addEventListener('storage', function(evt) {
  92     updateTabs();
  93   }, false);
  94
  95   if (navigator.appVersion.indexOf('Mac') != -1) {
  96     chrome.browserAction.setTitle({'title': 'High Contrast (Cmd+Shift+F11)'});
  97   }
  98 }
  99
 100 init();