braille_text_handler.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
5goog.provide('cvox.BrailleTextHandler');
6
7goog.require('cvox.BrailleInterface');
8goog.require('cvox.BrailleUtil');
9goog.require('cvox.ChromeVox');
10goog.require('cvox.NavBraille');
11
12/**
13 * @fileoverview Updates braille display contents following text changes.
14 *
15 */
16
17/**
18 * Represents an editable text region.
19 *
20 * @constructor
21 * @param {!cvox.BrailleInterface} braille Braille interface.
22 */
23cvox.BrailleTextHandler = function(braille) {
24  /**
25   * Braille interface used to produce output.
26   * @type {!cvox.BrailleInterface}
27   * @private
28   */
29  this.braille_ = braille;
30};
31
32
33/**
34 * Called by controller class when text changes.
35 * @param {string} line The text of the line.
36 * @param {number} start The 0-based index starting selection.
37 * @param {number} end The 0-based index ending selection.
38 * @param {boolean} multiline True if the text comes from a multi line text
39 * field.
40 * @param {Element} element DOM node which line comes from.
41 * @param {number} lineStart Start offset of line (might be > 0 for multiline
42 * fields).
43 */
44cvox.BrailleTextHandler.prototype.changed = function(
45    line, start, end, multiline, element, lineStart) {
46  var content;
47  if (multiline) {
48    var spannable = cvox.BrailleUtil.createValue(line, start, end, lineStart);
49    if (element) {
50      spannable.setSpan(element, 0, line.length);
51    }
52    content = new cvox.NavBraille({text: spannable,
53                                   startIndex: start,
54                                   endIndex: end});
55  } else {
56    if (cvox.ChromeVox.navigationManager) {
57      content = cvox.ChromeVox.navigationManager.getBraille();
58    }
59  }
60  if (content) {
61    this.braille_.write(content);
62  }
63};
64