ui/accessibility/extensions/colorenhancer/src/background.js

   1 // Copyright 2015 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 /**
   6  * Adds filter script and css to all existing tabs.
   7  *
   8  * TODO(wnwen): Verify content scripts are not being injected multiple times.
   9  */
  10 function injectContentScripts() {
  11   chrome.windows.getAll({'populate': true}, function(windows) {
  12     for (var i = 0; i < windows.length; i++) {
  13       var tabs = windows[i].tabs;
  14       for (var j = 0; j < tabs.length; j++) {
  15         var url = tabs[j].url;
  16         if (isDisallowedUrl(url)) {
  17           continue;
  18         }
  19         chrome.tabs.insertCSS(
  20             tabs[j].id,
  21             {file: 'res/cvd.css'});
  22         chrome.tabs.executeScript(
  23             tabs[j].id,
  24             {file: 'src/common.js'});
  25         chrome.tabs.executeScript(
  26             tabs[j].id,
  27             {file: 'src/cvd.js'});
  28       }
  29     }
  30   });
  31 }
  32
  33 /**
  34  * Updates all existing tabs with config values.
  35  */
  36 function updateTabs() {
  37   chrome.windows.getAll({'populate': true}, function(windows) {
  38     for (var i = 0; i < windows.length; i++) {
  39       var tabs = windows[i].tabs;
  40       for (var j = 0; j < tabs.length; j++) {
  41         var url = tabs[j].url;
  42         if (isDisallowedUrl(url)) {
  43           continue;
  44         }
  45         var msg = {
  46           'delta': getSiteDelta(siteFromUrl(url)),
  47           'severity': getDefaultSeverity(),
  48           'type': getDefaultType(),
  49           'simulate': getDefaultSimulate(),
  50           'enable': getDefaultEnable()
  51         };
  52         debugPrint('updateTabs: sending ' + JSON.stringify(msg) + ' to ' +
  53             siteFromUrl(url));
  54         chrome.tabs.sendRequest(tabs[j].id, msg);
  55       }
  56     }
  57   });
  58 }
  59
  60 /**
  61  * Initial extension loading.
  62  */
  63 (function initialize() {
  64   injectContentScripts();
  65   updateTabs();
  66
  67   chrome.extension.onRequest.addListener(
  68       function(request, sender, sendResponse) {
  69         if (request['init']) {
  70           var delta = getDefaultDelta();
  71           if (sender.tab) {
  72             delta = getSiteDelta(siteFromUrl(sender.tab.url));
  73           }
  74
  75           var msg = {
  76             'delta': delta,
  77             'severity': getDefaultSeverity(),
  78             'type': getDefaultType(),
  79             'simulate': getDefaultSimulate(),
  80             'enable': getDefaultEnable()
  81           };
  82           sendResponse(msg);
  83         }
  84       });
  85
  86   //TODO(mustaq): Handle uninstall
  87
  88   document.addEventListener('storage', function(evt) {
  89     updateTabs();
  90   }, false);
  91 })();