chrome/browser/resources/chromeos/chromevox/common/braille_text_handler.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 goog.provide('cvox.BrailleTextHandler');
   6
   7 goog.require('cvox.BrailleInterface');
   8 goog.require('cvox.BrailleUtil');
   9 goog.require('cvox.ChromeVox');
  10 goog.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  */
  23 cvox.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  */
  44 cvox.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 };