chrome/browser/resources/chromeos/chromevox/braille/spans.js

   1 // Copyright 2015 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 Objects used in spannables as annotations for ARIA values
   7  * and selections.
   8  */
   9
  10 goog.provide('cvox.ExtraCellsSpan');
  11 goog.provide('cvox.ValueSelectionSpan');
  12 goog.provide('cvox.ValueSpan');
  13
  14 goog.require('cvox.Spannable');
  15
  16 /**
  17  * Attached to the value region of a braille spannable.
  18  * @param {number} offset The offset of the span into the value.
  19  * @constructor
  20  */
  21 cvox.ValueSpan = function(offset) {
  22   /**
  23    * The offset of the span into the value.
  24    * @type {number}
  25    */
  26   this.offset = offset;
  27 };
  28
  29
  30 /**
  31  * Creates a value span from a json serializable object.
  32  * @param {!Object} obj The json serializable object to convert.
  33  * @return {!cvox.ValueSpan} The value span.
  34  */
  35 cvox.ValueSpan.fromJson = function(obj) {
  36   return new cvox.ValueSpan(obj.offset);
  37 };
  38
  39
  40 /**
  41  * Converts this object to a json serializable object.
  42  * @return {!Object} The JSON representation.
  43  */
  44 cvox.ValueSpan.prototype.toJson = function() {
  45   return this;
  46 };
  47
  48
  49 cvox.Spannable.registerSerializableSpan(
  50     cvox.ValueSpan,
  51     'cvox.ValueSpan',
  52     cvox.ValueSpan.fromJson,
  53     cvox.ValueSpan.prototype.toJson);
  54
  55
  56 /**
  57  * Attached to the selected text within a value.
  58  * @constructor
  59  */
  60 cvox.ValueSelectionSpan = function() {
  61 };
  62
  63
  64 cvox.Spannable.registerStatelessSerializableSpan(
  65     cvox.ValueSelectionSpan,
  66     'cvox.ValueSelectionSpan');
  67
  68
  69 /**
  70  * Causes raw cells to be added when translating from text to braille.
  71  * This is supported by the {@code cvox.ExpandingBrailleTranslator}
  72  * class.
  73  * @constructor
  74  */
  75 cvox.ExtraCellsSpan = function() {
  76   /** @type {ArrayBuffer} */
  77   this.cells = new Uint8Array(0).buffer;
  78 };