Adding ChromeVox as a component extensions (enabled only for ChromeOS, for no...

chrome/browser/resources/access_chromevox/chromevox/injected/init.js

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * @fileoverview Initializes the injected content script.
+ */
+
+goog.provide('cvox.ChromeVoxInit');
+
+goog.require('chromevis.ChromeVisLens');
+goog.require('cvox.AndroidDevTtsEngine');
+goog.require('cvox.AndroidEarcons');
+goog.require('cvox.AndroidRelTtsEngine');
+goog.require('cvox.BuildConfig');
+goog.require('cvox.ChromeVox');
+goog.require('cvox.ChromeVoxEventWatcher');
+goog.require('cvox.ChromeVoxKbHandler');
+goog.require('cvox.ChromeVoxNavigationManager');
+goog.require('cvox.ChromeVoxSearch');
+goog.require('cvox.ExtensionBridge');
+goog.require('cvox.LocalEarconsManager');
+goog.require('cvox.LocalTtsManager');
+goog.require('cvox.RemoteEarconsManager');
+goog.require('cvox.RemoteTtsManager');
+goog.require('cvox.SiteSpecificEnhancements');
+goog.require('cvox.TraverseContent');
+
+/**
+ * Initializes cvox.ChromeVox.
+ */
+cvox.ChromeVox.init = function() {
+  if (!goog.isDefAndNotNull(BUILD_TYPE)) {
+    return;
+  }
+
+  // Setup globals
+  cvox.ChromeVox.isActive = true;
+  cvox.ChromeVox.lens = new chromevis.ChromeVisLens();
+  cvox.ChromeVox.traverseContent = new cvox.TraverseContent();
+  cvox.ChromeVox.navigationManager =
+      new cvox.ChromeVoxNavigationManager();
+  cvox.ChromeVox.tts = cvox.ChromeVox.createTtsManager();
+  cvox.ChromeVox.earcons = cvox.ChromeVox.createEarconsManager(
+      cvox.ChromeVox.tts);
+
+  // Initialize common components
+  cvox.ChromeVoxSearch.init();
+
+  // Start the event watchers
+  cvox.ChromeVoxEventWatcher.addEventListeners();
+
+  // Load enhancements
+  cvox.SiteSpecificEnhancements.load();
+
+  // Perform build type specific initialization
+  cvox.ChromeVox.performBuildTypeSpecificInitialization();
+
+  // Read the settings
+  cvox.ChromeVox.loadKeyBindings();
+};
+
+/**
+ * @return {cvox.AbstractTtsManager} New initialized TTS manager.
+ */
+cvox.ChromeVox.createTtsManager = function() {
+  if (BUILD_TYPE == BUILD_TYPE_CHROME) {
+      return new cvox.RemoteTtsManager();
+  } else if (BUILD_TYPE == BUILD_TYPE_ANDROID) {
+      return new cvox.LocalTtsManager([cvox.AndroidRelTtsEngine], null);
+  } else if (BUILD_TYPE == BUILD_TYPE_ANDROID_DEV) {
+      return new cvox.LocalTtsManager([cvox.AndroidDevTtsEngine], null);
+  } else {
+      throw 'Unknown build type: ' + BUILD_TYPE;
+  }
+};
+
+/**
+ * @return {Object} New initialized earcons manager.
+ * @param {cvox.AbstractTtsManager} ttsManager A TTS Manager.
+ */
+cvox.ChromeVox.createEarconsManager = function(ttsManager) {
+  if (BUILD_TYPE == BUILD_TYPE_CHROME) {
+    return new cvox.RemoteEarconsManager();
+  } else if (BUILD_TYPE == BUILD_TYPE_ANDROID ||
+      BUILD_TYPE == BUILD_TYPE_ANDROID_DEV) {
+    return new cvox.LocalEarconsManager([cvox.AndroidEarcons], ttsManager);
+  } else {
+    throw 'Unknown build type: ' + BUILD_TYPE;
+  }
+};
+
+/**
+ * Performs initialization that is build type specific.
+ */
+cvox.ChromeVox.performBuildTypeSpecificInitialization = function() {
+  if (BUILD_TYPE == BUILD_TYPE_CHROME) {
+    // request settings
+    cvox.ExtensionBridge.send({
+      'target': 'Options',
+      'action': 'getSettings'
+    });
+    // Speak the title of the page
+    cvox.ChromeVox.tts.speak(document.title, 0, null);
+  } else if (BUILD_TYPE == BUILD_TYPE_ANDROID ||
+      BUILD_TYPE == BUILD_TYPE_ANDROID_DEV) {
+    /* do nothing */
+  } else {
+    throw 'Unknown build type: ' + BUILD_TYPE;
+  }
+};
+
+/**
+ * Loads the key bindings.
+ */
+cvox.ChromeVox.loadKeyBindings = function() {
+  if (BUILD_TYPE == BUILD_TYPE_CHROME) {
+    cvox.ExtensionBridge.addMessageListener(function(message) {
+      if (message.keyBindings) {
+        cvox.ChromeVoxKbHandler.loadKeyToFunctionsTable(message.keyBindings);
+      }
+    });
+  } else if (BUILD_TYPE == BUILD_TYPE_ANDROID ||
+      BUILD_TYPE == BUILD_TYPE_ANDROID_DEV) {
+    var keyBindings = cvox.ChromeVox.getStringifiedAndroidKeyBindings();
+    cvox.ChromeVoxKbHandler.loadKeyToFunctionsTable(
+        cvox.ChromeVoxJSON.parse(keyBindings, null));
+    return;
+  } else {
+    throw 'Unknown build type: ' + BUILD_TYPE;
+  }
+};
+
+/**
+ * @return {string} The Android key bindings as a JSON string.
+ */
+cvox.ChromeVox.getStringifiedAndroidKeyBindings = function() {
+  // TODO(svetoslavganov): Change the bindings for Android
+  return JSON.stringify({
+     // Stop TTS
+    '#17' : 'stopSpeech', // Ctrl
+
+    // TODO(svetoslavganov): Uncomment the key bindings below once
+    // our handleTab implementation is fixed and the handeShiftTab
+    // is implemented. For now we use the default browser behavior.
+    // TAB/Shift+TAB
+    // '#9' : 'handleTab', // Tab
+    // 'Shift+#9' : 'handleShiftTab',
+
+    // Basic navigation
+    // Note that the arrows are bound this way so they
+    // are consistent with the built-in accessibility support
+    // in the case of disabled JavaScript.
+    '#38' : 'backward',
+    '#40' : 'forward',
+    'Shift+#38' : 'nop', // swallow Shift + up arrow
+    'Shift+#40' : 'nop', // swallow Shift + down arrow
+    '#37' : 'nop', // swallow left arrow
+    '#39' : 'nop', // swallow right arrow
+    'Shift+#37' : 'up',
+    'Shift+#39' : 'down',
+    '#13' : 'actOnCurrentItem', // ENTER
+    'Shift+#16' : 'nop', // swallow Shift
+
+    // General commands
+    'Ctrl+Alt+#191' : 'toggleSearchWidget',      // '/'
+    'Ctrl+Alt+B' : 'showBookmarkManager',
+    'Ctrl+Alt+A' : 'nextTtsEngine',
+    'Ctrl+Alt+#189' : 'decreaseTtsRate',         // '-'
+    'Ctrl+Alt+#187' : 'increaseTtsRate',         // '='
+    'Ctrl+Alt+Shift+#189' : 'decreaseTtsPitch',  // '-'
+    'Ctrl+Alt+Shift+#187' : 'increaseTtsPitch',  // '='
+    'Ctrl+Alt+#219' : 'decreaseTtsVolume',       // '['
+    'Ctrl+Alt+#221' : 'increaseTtsVolume',       // ']'
+
+    // Jump commands
+    'Ctrl+Alt+1' : 'nextHeading1',
+    'Ctrl+Alt+Shift+1' : 'previousHeading1',
+    'Ctrl+Alt+2' : 'nextHeading2',
+    'Ctrl+Alt+Shift+2' : 'previousHeading2',
+    'Ctrl+Alt+3' : 'nextHeading3',
+    'Ctrl+Alt+Shift+3' : 'previousHeading3',
+    'Ctrl+Alt+4' : 'nextHeading4',
+    'Ctrl+Alt+Shift+4' : 'previousHeading4',
+    'Ctrl+Alt+5' : 'nextHeading5',
+    'Ctrl+Alt+Shift+5' : 'previousHeading5',
+    'Ctrl+Alt+6' : 'nextHeading6',
+    'Ctrl+Alt+Shift+6' : 'previousHeading6',
+    'Ctrl+Alt+C' : 'nextCheckbox',
+    'Ctrl+Alt+Shift+C' : 'previousCheckbox',
+    'Ctrl+Alt+E' : 'nextEditText',
+    'Ctrl+Alt+Shift+E' : 'previousEditText',
+    'Ctrl+Alt+F' : 'nextFormField',
+    'Ctrl+Alt+Shift+F' : 'previousFormField',
+    'Ctrl+Alt+G' : 'nextGraphic',
+    'Ctrl+Alt+Shift+G' : 'previousGraphic',
+    'Ctrl+Alt+H' : 'nextHeading',
+    'Ctrl+Alt+Shift+H' : 'previousHeading',
+    'Ctrl+Alt+I' : 'nextListItem',
+    'Ctrl+Alt+Shift+I' : 'previousListItem',
+    'Ctrl+Alt+L' : 'nextLink',
+    'Ctrl+Alt+Shift+L' : 'previousLink',
+    'Ctrl+Alt+N' : 'nextNotLink',
+    'Ctrl+Alt+Shift+N' : 'previousNotLink',
+    'Ctrl+Alt+O' : 'nextList',
+    'Ctrl+Alt+Shift+O' : 'previousList',
+    'Ctrl+Alt+Q' : 'nextBlockquote',
+    'Ctrl+Alt+Shift+Q' : 'previousBlockquote',
+    'Ctrl+Alt+R' : 'nextRadio',
+    'Ctrl+Alt+Shift+R' : 'previousRadio',
+    'Ctrl+Alt+S' : 'nextSlider',
+    'Ctrl+Alt+Shift+S' : 'previousSlider',
+    'Ctrl+Alt+T' : 'nextTable',
+    'Ctrl+Alt+Shift+T' : 'previousTable',
+    'Ctrl+Alt+U' : 'nextButton',
+    'Ctrl+Alt+Shift+U' : 'previousButton',
+    'Ctrl+Alt+X' : 'nextComboBox',
+    'Ctrl+Alt+Shift+X' : 'previousComboBox'
+  });
+};
+
+window.setTimeout(cvox.ChromeVox.init, 0);