object_walker.js revision cedac228d2dd51db4b79ea1e72c7f249408ee061 
1// Copyright 2014 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/**
6 * @fileoverview A JavaScript class for walking the leaf nodes of the dom.
7 */
8
9
10goog.provide('cvox.ObjectWalker');
11
12goog.require('cvox.AbstractNodeWalker');
13goog.require('cvox.BrailleUtil');
14goog.require('cvox.DescriptionUtil');
15
16/**
17 * @constructor
18 * @extends {cvox.AbstractNodeWalker}
19 */
20cvox.ObjectWalker = function() {
21  goog.base(this);
22};
23goog.inherits(cvox.ObjectWalker, cvox.AbstractNodeWalker);
24
25/**
26 * @override
27 */
28cvox.ObjectWalker.prototype.stopNodeDescent = function(node) {
29  return cvox.DomUtil.isLeafNode(node);
30};
31
32// TODO(dtseng): Causes a circular dependency if put into AbstractNodeWalker.
33/**
34 * @override
35 */
36cvox.AbstractNodeWalker.prototype.getDescription = function(prevSel, sel) {
37  return cvox.DescriptionUtil.getDescriptionFromNavigation(
38      prevSel.end.node,
39      sel.start.node,
40      true,
41      cvox.ChromeVox.verbosity);
42};
43
44/**
45 * @override
46 */
47cvox.ObjectWalker.prototype.getBraille = function(prevSel, sel) {
48  throw 'getBraille is unsupported';
49};
50
51/**
52 * @override
53 */
54cvox.ObjectWalker.prototype.getGranularityMsg = function() {
55  return cvox.ChromeVox.msgs.getMsg('object_strategy');
56};
57