content/browser/resources/accessibility/accessibility.js

   1 // Copyright (c) 2013 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 cr.define('accessibility', function() {
   6   'use strict';
   7
   8   // Keep in sync with view_message_enums.h
   9   var AccessibilityModeFlag = {
  10     Platform: 1 << 0,
  11     FullTree: 1 << 1
  12   }
  13
  14   var AccessibilityMode = {
  15     Off: 0,
  16     Complete:
  17         AccessibilityModeFlag.Platform | AccessibilityModeFlag.FullTree,
  18     EditableTextOnly: AccessibilityModeFlag.Platform,
  19     TreeOnly: AccessibilityModeFlag.FullTree
  20   }
  21
  22   function isAccessibilityComplete(mode) {
  23     return ((mode & AccessibilityMode.Complete) == AccessibilityMode.Complete);
  24   }
  25
  26   function requestData() {
  27     var xhr = new XMLHttpRequest();
  28     xhr.open('GET', 'targets-data.json', false);
  29     xhr.send(null);
  30     if (xhr.status === 200) {
  31       console.log(xhr.responseText);
  32       return JSON.parse(xhr.responseText);
  33     }
  34     return [];
  35   }
  36
  37   // TODO(aboxhall): add a mechanism to request individual and global a11y
  38   // mode, xhr them on toggle... or just re-requestData and be smarter about
  39   // ID-ing rows?
  40
  41   function toggleAccessibility(data, element) {
  42     chrome.send('toggleAccessibility',
  43                 [String(data.processId), String(data.routeId)]);
  44     var a11y_was_on = (element.textContent.match(/on/) != null);
  45     element.textContent = ' accessibility ' + (a11y_was_on ? ' off' : ' on');
  46     var row = element.parentElement;
  47     if (a11y_was_on) {
  48       while (row.lastChild != element)
  49         row.removeChild(row.lastChild);
  50     } else {
  51       row.appendChild(document.createTextNode(' | '));
  52       row.appendChild(createShowAccessibilityTreeElement(data, row, false));
  53     }
  54   }
  55
  56   function requestAccessibilityTree(data, element) {
  57     chrome.send('requestAccessibilityTree',
  58                 [String(data.processId), String(data.routeId)]);
  59   }
  60
  61   function toggleGlobalAccessibility() {
  62     chrome.send('toggleGlobalAccessibility');
  63     document.location.reload(); // FIXME see TODO above
  64   }
  65
  66   function initialize() {
  67     console.log('initialize');
  68     var data = requestData();
  69
  70     addGlobalAccessibilityModeToggle(data['global_a11y_mode']);
  71
  72     $('pages').textContent = '';
  73
  74     var list = data['list'];
  75     for (var i = 0; i < list.length; i++) {
  76       addToPagesList(list[i]);
  77     }
  78   }
  79
  80   function addGlobalAccessibilityModeToggle(global_a11y_mode) {
  81     var full_a11y_on = isAccessibilityComplete(global_a11y_mode);
  82     $('toggle_global').textContent = (full_a11y_on ? 'on' : 'off');
  83     $('toggle_global').addEventListener('click',
  84                                         toggleGlobalAccessibility);
  85   }
  86
  87   function addToPagesList(data) {
  88     // TODO: iterate through data and pages rows instead
  89     var id = data['processId'] + '.' + data['routeId'];
  90     var row = document.createElement('div');
  91     row.className = 'row';
  92     row.id = id;
  93     formatRow(row, data);
  94
  95     row.processId = data.processId;
  96     row.routeId = data.routeId;
  97
  98     var list = $('pages');
  99     list.appendChild(row);
 100   }
 101
 102   function formatRow(row, data) {
 103     if (!('url' in data)) {
 104       if ('error' in data) {
 105         row.appendChild(createErrorMessageElement(data, row));
 106         return;
 107       }
 108     }
 109     var properties = ['favicon_url', 'name', 'url'];
 110     for (var j = 0; j < properties.length; j++)
 111       row.appendChild(formatValue(data, properties[j]));
 112
 113     row.appendChild(createToggleAccessibilityElement(data));
 114     if (isAccessibilityComplete(data['a11y_mode'])) {
 115       row.appendChild(document.createTextNode(' | '));
 116       if ('tree' in data) {
 117         row.appendChild(createShowAccessibilityTreeElement(data, row, true));
 118         row.appendChild(document.createTextNode(' | '));
 119         row.appendChild(createHideAccessibilityTreeElement(row.id));
 120         row.appendChild(createAccessibilityTreeElement(data));
 121       }
 122       else {
 123         row.appendChild(createShowAccessibilityTreeElement(data, row, false));
 124         if ('error' in data)
 125           row.appendChild(createErrorMessageElement(data, row));
 126       }
 127     }
 128   }
 129
 130   function formatValue(data, property) {
 131     var value = data[property];
 132
 133     if (property == 'favicon_url') {
 134       var faviconElement = document.createElement('img');
 135       if (value)
 136         faviconElement.src = value;
 137       faviconElement.alt = "";
 138       return faviconElement;
 139     }
 140
 141     var text = value ? String(value) : '';
 142     if (text.length > 100)
 143       text = text.substring(0, 100) + '\u2026';  // ellipsis
 144
 145     var span = document.createElement('span');
 146     span.textContent = ' ' + text + ' ';
 147     span.className = property;
 148     return span;
 149   }
 150
 151   function createToggleAccessibilityElement(data) {
 152     var link = document.createElement('a');
 153     link.setAttribute('href', '#');
 154     var full_a11y_on = isAccessibilityComplete(data['a11y_mode']);
 155     link.textContent = 'accessibility ' + (full_a11y_on ? 'on' : 'off');
 156     link.addEventListener('click',
 157                           toggleAccessibility.bind(this, data, link));
 158     return link;
 159   }
 160
 161   function createShowAccessibilityTreeElement(data, row, opt_refresh) {
 162     var link = document.createElement('a');
 163     link.setAttribute('href', '#');
 164     if (opt_refresh)
 165       link.textContent = 'refresh accessibility tree';
 166     else
 167       link.textContent = 'show accessibility tree';
 168     link.id = row.id + ':showTree';
 169     link.addEventListener('click',
 170                           requestAccessibilityTree.bind(this, data, link));
 171     return link;
 172   }
 173
 174   function createHideAccessibilityTreeElement(id) {
 175     var link = document.createElement('a');
 176     link.setAttribute('href', '#');
 177     link.textContent = 'hide accessibility tree';
 178     link.addEventListener('click',
 179                           function() {
 180         $(id + ':showTree').textContent = 'show accessibility tree';
 181         var existingTreeElements = $(id).getElementsByTagName('pre');
 182         for (var i = 0; i < existingTreeElements.length; i++)
 183           $(id).removeChild(existingTreeElements[i]);
 184         var row = $(id);
 185         while (row.lastChild != $(id + ':showTree'))
 186           row.removeChild(row.lastChild);
 187     });
 188     return link;
 189   }
 190
 191   function createErrorMessageElement(data) {
 192     var errorMessageElement = document.createElement('div');
 193     var errorMessage = data.error;
 194     errorMessageElement.innerHTML = errorMessage + '&nbsp;';
 195     var closeLink = document.createElement('a');
 196     closeLink.href='#';
 197     closeLink.textContent = '[close]';
 198     closeLink.addEventListener('click', function() {
 199         var parentElement = errorMessageElement.parentElement;
 200         parentElement.removeChild(errorMessageElement);
 201         if (parentElement.childElementCount == 0)
 202           parentElement.parentElement.removeChild(parentElement);
 203     });
 204     errorMessageElement.appendChild(closeLink);
 205     return errorMessageElement;
 206   }
 207
 208   function showTree(data) {
 209     var id = data.processId + '.' + data.routeId;
 210     var row = $(id);
 211     if (!row)
 212       return;
 213
 214     row.textContent = '';
 215     formatRow(row, data);
 216   }
 217
 218   function createAccessibilityTreeElement(data) {
 219     var treeElement = document.createElement('pre');
 220     var tree = data.tree;
 221     treeElement.textContent = tree;
 222     return treeElement;
 223   }
 224
 225   return {
 226     initialize: initialize,
 227     showTree: showTree
 228   };
 229 });
 230
 231 document.addEventListener('DOMContentLoaded', accessibility.initialize);