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

chrome/browser/resources/access_chromevox/audio/background/earcons.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 Earcons library that uses the HTML5 Audio element to play back
+ * auditory cues.
+ */
+
+goog.provide('cvox.ChromeVoxEarcons');
+
+goog.require('cvox.AbstractEarcons');
+
+/**
+ * @constructor
+ * @extends {cvox.AbstractEarcons}
+ */
+cvox.ChromeVoxEarcons = function() {
+  //Inherit AbstractEarcons
+  cvox.AbstractEarcons.call(this);
+
+  this.audioMap = new Object();
+};
+goog.inherits(cvox.ChromeVoxEarcons, cvox.AbstractEarcons);
+
+/**
+ * @return {string} The human-readable name of the earcon set.
+ */
+cvox.ChromeVoxEarcons.prototype.getName = function() {
+  return 'ChromeVox earcons';
+};
+
+/**
+ * @return {string} The base URL for loading earcons.
+ */
+cvox.ChromeVoxEarcons.prototype.getBaseUrl = function() {
+  return cvox.ChromeVoxEarcons.BASE_URL;
+};
+
+/**
+ * Plays the specified earcon sound.
+ * @param {number} earcon The earcon index.
+ */
+cvox.ChromeVoxEarcons.prototype.playEarcon = function(earcon) {
+  cvox.ChromeVoxEarcons.superClass_.playEarcon.call(this, earcon);
+  this.currentAudio = this.audioMap[earcon];
+  if (!this.currentAudio) {
+    var earconMap = this.getEarconMap();
+    if (!earconMap || !earconMap[earcon]) {
+      return;
+    }
+    this.currentAudio = new Audio(this.getBaseUrl() + earconMap[earcon]);
+    this.audioMap[earcon] = this.currentAudio;
+  }
+  try {
+    this.currentAudio.currentTime = 0;
+  } catch (e) {
+  }
+  if (this.currentAudio.paused) {
+    this.currentAudio.play();
+  }
+};
+
+/**
+ * @return {Object} The earcon map which is lazy initialized.
+ */
+cvox.ChromeVoxEarcons.prototype.getEarconMap = function() {
+  if (this.earconMap) {
+    return this.earconMap;
+  }
+  this.earconMap = new Object();
+  this.earconMap[cvox.AbstractEarcons.ALERT_MODAL] = 'alert_modal.ogg';
+  this.earconMap[cvox.AbstractEarcons.ALERT_NONMODAL] =
+      'alert_nonmodal.ogg';
+  this.earconMap[cvox.AbstractEarcons.BULLET] = 'bullet.ogg';
+  this.earconMap[cvox.AbstractEarcons.BUSY_PROGRESS_LOOP] =
+      'busy_progress_loop.ogg';
+  this.earconMap[cvox.AbstractEarcons.BUSY_WORKING_LOOP] =
+      'busy_working_loop.ogg';
+  this.earconMap[cvox.AbstractEarcons.BUTTON] = 'button.ogg';
+  this.earconMap[cvox.AbstractEarcons.CHECK_OFF] = 'check_off.ogg';
+  this.earconMap[cvox.AbstractEarcons.CHECK_ON] = 'check_on.ogg';
+  this.earconMap[cvox.AbstractEarcons.COLLAPSED] = 'collapsed.ogg';
+  this.earconMap[cvox.AbstractEarcons.EDITABLE_TEXT] = 'editable_text.ogg';
+  this.earconMap[cvox.AbstractEarcons.ELLIPSIS] = 'ellipsis.ogg';
+  this.earconMap[cvox.AbstractEarcons.EXPANDED] = 'expanded.ogg';
+  this.earconMap[cvox.AbstractEarcons.FONT_CHANGE] = 'font_change.ogg';
+  this.earconMap[cvox.AbstractEarcons.INVALID_KEYPRESS] =
+      'invalid_keypress.ogg';
+  this.earconMap[cvox.AbstractEarcons.LINK] = 'link.ogg';
+  this.earconMap[cvox.AbstractEarcons.LISTBOX] = 'listbox.ogg';
+  this.earconMap[cvox.AbstractEarcons.NEW_MAIL] = 'new_mail.ogg';
+  this.earconMap[cvox.AbstractEarcons.OBJECT_CLOSE] = 'object_close.ogg';
+  this.earconMap[cvox.AbstractEarcons.OBJECT_DELETE] = 'object_delete.ogg';
+  this.earconMap[cvox.AbstractEarcons.OBJECT_DESELECT] =
+      'object_deselect.ogg';
+  this.earconMap[cvox.AbstractEarcons.OBJECT_OPEN] = 'object_open.ogg';
+  this.earconMap[cvox.AbstractEarcons.OBJECT_SELECT] = 'object_select.ogg';
+  this.earconMap[cvox.AbstractEarcons.PARAGRAPH_BREAK] =
+      'paragraph_break.ogg';
+  this.earconMap[cvox.AbstractEarcons.SEARCH_HIT] = 'search_hit.ogg';
+  this.earconMap[cvox.AbstractEarcons.SEARCH_MISS] = 'search_miss.ogg';
+  this.earconMap[cvox.AbstractEarcons.SECTION] = 'section.ogg';
+  this.earconMap[cvox.AbstractEarcons.TASK_SUCCESS] = 'task_success.ogg';
+  this.earconMap[cvox.AbstractEarcons.WRAP] = 'wrap.ogg';
+  this.earconMap[cvox.AbstractEarcons.WRAP_EDGE] = 'wrap_edge.ogg';
+
+  return this.earconMap;
+};
+
+/**
+ * The base URL for  loading eracons.
+ * @type {string}
+ */
+cvox.ChromeVoxEarcons.BASE_URL = 'earcons/';