chrome/browser/resources/chromeos/chromevox/walkers/group_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 class for walking "groups". Groups, intuitively, are logical
   7  * collections of dom elements. See AbstractNodeWalker and the
   8  * stopNodeDescent() method here for how groups are defined.
   9  */
  10
  11
  12 goog.provide('cvox.GroupWalker');
  13
  14 goog.require('cvox.AbstractNodeWalker');
  15 goog.require('cvox.BrailleUtil');
  16 goog.require('cvox.CursorSelection');
  17 goog.require('cvox.DescriptionUtil');
  18 goog.require('cvox.DomUtil');
  19 goog.require('cvox.GroupUtil');
  20
  21
  22 /**
  23  * @constructor
  24  * @extends {cvox.AbstractNodeWalker}
  25  */
  26 cvox.GroupWalker = function() {
  27   cvox.AbstractNodeWalker.call(this);
  28 };
  29 goog.inherits(cvox.GroupWalker, cvox.AbstractNodeWalker);
  30
  31
  32 /**
  33  * @override
  34  */
  35 cvox.GroupWalker.prototype.getDescription = function(prevSel, sel) {
  36   return cvox.DescriptionUtil.getCollectionDescription(prevSel, sel);
  37 };
  38
  39
  40 /**
  41  * @override
  42  */
  43 cvox.GroupWalker.prototype.getBraille = function(prevSel, sel) {
  44   throw 'getBraille is unsupported';
  45 };
  46
  47 /**
  48  * @override
  49  */
  50 cvox.GroupWalker.prototype.getGranularityMsg = function() {
  51   return cvox.ChromeVox.msgs.getMsg('group_strategy');
  52 };
  53
  54 /**
  55  * @override
  56  */
  57 cvox.GroupWalker.prototype.stopNodeDescent = function(node) {
  58   return cvox.GroupUtil.isLeafNode(node);
  59 };