Use new earcons in ChromeVox Next.

chrome/browser/resources/chromeos/chromevox/cvox2/background/earcons_background.js

+// Copyright 2015 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 EarconEngine to play back
+ * auditory cues.
+ *
+ */
+
+
+goog.provide('Cvox2EarconsBackground');

[Peter Lundblad, 2015/09/07 21:15:53]

Do we need the cvox2 and background parts of this name?  Everything
cvox2 we put unqualified in the top-level namespace and everything
(perhpas with some exceptions) in cvox2 should happen in the background page.

[dmazzoni, 2015/09/07 23:43:04]

Open to suggestions, but for a short period of time we need to switch between
two earcon implementations so I want it to be clear.

[dmazzoni, 2015/09/22 19:18:17]

After discussing with David I renamed the old class so now we have
ClassicEarcons and NextEarcons. How does that sound?

+
+goog.require('EarconEngine');
+goog.require('cvox.AbstractEarcons');
+
+
+/**
+ * @constructor
+ * @extends {cvox.AbstractEarcons}
+ */
+Cvox2EarconsBackground = function() {
+  goog.base(this);

[Peter Lundblad, 2015/09/07 21:15:53]

I've stopped using this for new code. Just .call the base cosntructor.

[dmazzoni, 2015/09/22 19:18:17]

Done.

+
+  /** @type {EarconEngine} The ChromeVox Next earcon engine. */
+  this.engine_ = new EarconEngine();
+};
+goog.inherits(Cvox2EarconsBackground, cvox.AbstractEarcons);

[Peter Lundblad, 2015/09/07 21:15:52]

And this.

[dmazzoni, 2015/09/22 19:18:17]

Done.

+
+
+/**
+ * @return {string} The human-readable name of the earcon set.
+ */
+Cvox2EarconsBackground.prototype.getName = function() {
+  return 'ChromeVox Next earcons';
+};
+
+
+/**
+ * @override
+ */
+Cvox2EarconsBackground.prototype.playEarcon = function(earcon) {
+  goog.base(this, 'playEarcon', earcon);
+  if (!this.enabled) {
+    return;
+  }
+  if (window['console']) {
+    window['console']['log']('Earcon ' + earcon);
+  }
+
+  switch (earcon) {
+    case cvox.Earcon.ALERT_MODAL:
+    case cvox.Earcon.ALERT_NONMODAL:
+      this.engine_.onAlert();
+      break;
+    case cvox.Earcon.BUTTON:
+      this.engine_.onButton();
+      break;
+    case cvox.Earcon.CHECK_OFF:
+      this.engine_.onCheckOff();
+      break;
+    case cvox.Earcon.CHECK_ON:
+      this.engine_.onCheckOn();
+      break;
+    case cvox.Earcon.EDITABLE_TEXT:
+      this.engine_.onTextField();
+      break;
+    case cvox.Earcon.INVALID_KEYPRESS:
+      break;
+    case cvox.Earcon.LINK:
+      this.engine_.onLink();
+      break;
+    case cvox.Earcon.LISTBOX:
+      this.engine_.onSelect();
+      break;
+    case cvox.Earcon.LIST_ITEM:
+    case cvox.Earcon.LONG_DESC:
+    case cvox.Earcon.MATH:
+    case cvox.Earcon.OBJECT_CLOSE:
+    case cvox.Earcon.OBJECT_ENTER:
+    case cvox.Earcon.OBJECT_EXIT:
+    case cvox.Earcon.OBJECT_OPEN:
+    case cvox.Earcon.OBJECT_SELECT:
+    case cvox.Earcon.PAGE_FINISH_LOADING:
+      this.engine_.cancelProgress();
+      break;
+    case cvox.Earcon.PAGE_START_LOADING:
+      this.engine_.startProgress();

[Peter Lundblad, 2015/09/07 21:15:53]

How does this work if there's more than one page loading at the same time?

[dmazzoni, 2015/09/22 19:18:18]

Added a TODO. I want this to only matter when the page has focus, but we need
better focus tracking to be able to do that.

+      break;
+    case cvox.Earcon.POP_UP_BUTTON:
+      this.engine_.onPopUpButton();
+      break;
+    case cvox.Earcon.RECOVER_FOCUS:
+    case cvox.Earcon.SELECTION:
+      this.engine_.onSelection();
+      break;
+    case cvox.Earcon.SELECTION_REVERSE:
+      this.engine_.onSelectionReverse();
+      break;
+    case cvox.Earcon.SKIP:
+      this.engine_.onSkim();
+      break;
+    case cvox.Earcon.SLIDER:
+      this.engine_.onSlider();
+      break;
+    case cvox.Earcon.WRAP:
+    case cvox.Earcon.WRAP_EDGE:
+      this.engine_.onWrap();
+      break;
+  }
+};