chrome/browser/resources/chromeos/chromevox/walkers/object_walker.js

   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
  10 goog.provide('cvox.ObjectWalker');
  11
  12 goog.require('cvox.AbstractNodeWalker');
  13 goog.require('cvox.BrailleUtil');
  14 goog.require('cvox.DescriptionUtil');
  15
  16 /**
  17  * @constructor
  18  * @extends {cvox.AbstractNodeWalker}
  19  */
  20 cvox.ObjectWalker = function() {
  21   goog.base(this);
  22 };
  23 goog.inherits(cvox.ObjectWalker, cvox.AbstractNodeWalker);
  24
  25 /**
  26  * @override
  27  */
  28 cvox.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  */
  36 cvox.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  */
  47 cvox.ObjectWalker.prototype.getBraille = function(prevSel, sel) {
  48   throw 'getBraille is unsupported';
  49 };
  50
  51 /**
  52  * @override
  53  */
  54 cvox.ObjectWalker.prototype.getGranularityMsg = function() {
  55   return cvox.ChromeVox.msgs.getMsg('object_strategy');
  56 };