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.
6var 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};
41