chrome/browser/resources/chromeos/keyboard_overlay_accessibility_helper.js

   1 // Copyright (c) 2011 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 // An object to implement keyboard overlay accessibility.
   6 var KeyboardOverlayAccessibilityHelper = {
   7   // Returns true when ChromeVox is loaded and active, false otherwise.
   8   cvoxIsActive: function() {
   9     return window.cvox && window.cvox.Api.isChromeVoxActive();
  10   },
  11   // Speaks all the shortcut with the given modifiers.
  12   maybeSpeakAllShortcuts: function(modifiers) {
  13     if (!this.cvoxIsActive())
  14       return;
  15     cvox.Api.stop();
  16     var keyboardGlyphData = getKeyboardGlyphData();
  17     var shortcutData = getShortcutData();
  18     var layout = getLayouts()[keyboardGlyphData.layoutName];
  19     var keysToShortcutText = {};
  20     for (var i = 0; i < layout.length; ++i) {
  21       var identifier = remapIdentifier(layout[i][0]);
  22       var keyData = keyboardGlyphData.keys[identifier];
  23       var keyLabel = getKeyLabel(keyData, modifiers);
  24       var shortcutId = shortcutData[getAction(keyLabel, modifiers)];
  25       var shortcutText = templateData[shortcutId];
  26       var keysText = modifiers.concat(keyLabel).join(' + ');
  27       if (shortcutText)
  28         keysToShortcutText[keysText] = shortcutText;
  29     }
  30     for (var keysText in keysToShortcutText) {
  31       this.speakShortcut_(keysText, keysToShortcutText[keysText]);
  32     }
  33   },
  34   // Speaks given shortcut description.
  35   speakShortcut_: function(keysText, shortcutText) {
  36     keysText = keysText.toLowerCase();  // For correct pronunciation.
  37     cvox.Api.speak(keysText, 1, {});
  38     cvox.Api.speak(shortcutText, 1, {});
  39   },
  40 };