Refactorings to reduce dependencies in ChromeVox 2.

chrome/browser/resources/chromeos/chromevox/braille/spans.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 Objects used in spannables as annotations for ARIA values
+ * and selections.
+ */
+
+goog.provide('cvox.ValueSelectionSpan');
+goog.provide('cvox.ValueSpan');
+
+goog.require('cvox.Spannable');
+
+/**
+ * Attached to the value region of a braille spannable.
+ * @param {number} offset The offset of the span into the value.
+ * @constructor
+ */
+cvox.ValueSpan = function(offset) {
+  /**
+   * The offset of the span into the value.
+   * @type {number}
+   */
+  this.offset = offset;
+};
+
+
+/**
+ * Creates a value span from a json serializable object.
+ * @param {!Object} obj The json serializable object to convert.
+ * @return {!cvox.ValueSpan} The value span.
+ */
+cvox.ValueSpan.fromJson = function(obj) {
+  return new cvox.ValueSpan(obj.offset);
+};
+
+
+/**
+ * Converts this object to a json serializable object.
+ * @return {!Object} The JSON representation.
+ */
+cvox.ValueSpan.prototype.toJson = function() {
+  return this;
+};
+
+
+cvox.Spannable.registerSerializableSpan(
+    cvox.ValueSpan,
+    'cvox.ValueSpan',
+    cvox.ValueSpan.fromJson,
+    cvox.ValueSpan.prototype.toJson);
+
+
+/**
+ * Attached to the selected text within a value.
+ * @constructor
+ */
+cvox.ValueSelectionSpan = function() {
+};
+
+
+cvox.Spannable.registerStatelessSerializableSpan(
+    cvox.ValueSelectionSpan,
+    'cvox.ValueSelectionSpan');