content/renderer/accessibility/blink_ax_tree_source.cc

   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 #include "content/renderer/accessibility/blink_ax_tree_source.h"
   6
   7 #include <set>
   8
   9 #include "base/strings/string_number_conversions.h"
  10 #include "base/strings/string_util.h"
  11 #include "base/strings/utf_string_conversions.h"
  12 #include "content/common/accessibility_messages.h"
  13 #include "content/renderer/accessibility/blink_ax_enum_conversion.h"
  14 #include "content/renderer/accessibility/renderer_accessibility.h"
  15 #include "content/renderer/browser_plugin/browser_plugin.h"
  16 #include "content/renderer/render_frame_impl.h"
  17 #include "content/renderer/render_frame_proxy.h"
  18 #include "content/renderer/render_view_impl.h"
  19 #include "third_party/WebKit/public/platform/WebRect.h"
  20 #include "third_party/WebKit/public/platform/WebSize.h"
  21 #include "third_party/WebKit/public/platform/WebString.h"
  22 #include "third_party/WebKit/public/platform/WebVector.h"
  23 #include "third_party/WebKit/public/web/WebAXEnums.h"
  24 #include "third_party/WebKit/public/web/WebAXObject.h"
  25 #include "third_party/WebKit/public/web/WebDocument.h"
  26 #include "third_party/WebKit/public/web/WebDocumentType.h"
  27 #include "third_party/WebKit/public/web/WebElement.h"
  28 #include "third_party/WebKit/public/web/WebFormControlElement.h"
  29 #include "third_party/WebKit/public/web/WebFrame.h"
  30 #include "third_party/WebKit/public/web/WebLocalFrame.h"
  31 #include "third_party/WebKit/public/web/WebNode.h"
  32 #include "third_party/WebKit/public/web/WebPlugin.h"
  33 #include "third_party/WebKit/public/web/WebPluginContainer.h"
  34 #include "third_party/WebKit/public/web/WebView.h"
  35
  36 using base::ASCIIToUTF16;
  37 using base::UTF16ToUTF8;
  38 using blink::WebAXObject;
  39 using blink::WebDocument;
  40 using blink::WebDocumentType;
  41 using blink::WebElement;
  42 using blink::WebFrame;
  43 using blink::WebLocalFrame;
  44 using blink::WebNode;
  45 using blink::WebPlugin;
  46 using blink::WebPluginContainer;
  47 using blink::WebVector;
  48 using blink::WebView;
  49
  50 namespace content {
  51
  52 namespace {
  53
  54 // Returns true if |ancestor| is the first unignored parent of |child|,
  55 // which means that when walking up the parent chain from |child|,
  56 // |ancestor| is the *first* ancestor that isn't marked as
  57 // accessibilityIsIgnored().
  58 bool IsParentUnignoredOf(WebAXObject ancestor,
  59                          WebAXObject child) {
  60   WebAXObject parent = child.parentObject();
  61   while (!parent.isDetached() && parent.accessibilityIsIgnored())
  62     parent = parent.parentObject();
  63   return parent.equals(ancestor);
  64 }
  65
  66 std::string GetEquivalentAriaRoleString(const ui::AXRole role) {
  67   switch (role) {
  68     case ui::AX_ROLE_ARTICLE:
  69       return "article";
  70     case ui::AX_ROLE_BANNER:
  71       return "banner";
  72     case ui::AX_ROLE_BUTTON:
  73       return "button";
  74     case ui::AX_ROLE_COMPLEMENTARY:
  75       return "complementary";
  76     case ui::AX_ROLE_FIGURE:
  77       return "figure";
  78     case ui::AX_ROLE_FOOTER:
  79       return "contentinfo";
  80     case ui::AX_ROLE_HEADING:
  81       return "heading";
  82     case ui::AX_ROLE_IMAGE:
  83       return "img";
  84     case ui::AX_ROLE_MAIN:
  85       return "main";
  86     case ui::AX_ROLE_NAVIGATION:
  87       return "navigation";
  88     case ui::AX_ROLE_RADIO_BUTTON:
  89       return "radio";
  90     case ui::AX_ROLE_REGION:
  91       return "region";
  92     case ui::AX_ROLE_SLIDER:
  93       return "slider";
  94     default:
  95       break;
  96   }
  97
  98   return std::string();
  99 }
 100
 101 void AddIntListAttributeFromWebObjects(ui::AXIntListAttribute attr,
 102                                        WebVector<WebAXObject> objects,
 103                                        AXContentNodeData* dst) {
 104   std::vector<int32> ids;
 105   for(size_t i = 0; i < objects.size(); i++)
 106     ids.push_back(objects[i].axID());
 107   if (ids.size() > 0)
 108     dst->AddIntListAttribute(attr, ids);
 109 }
 110
 111 }  // Anonymous namespace
 112
 113 BlinkAXTreeSource::BlinkAXTreeSource(RenderFrameImpl* render_frame)
 114     : render_frame_(render_frame),
 115       accessibility_focus_id_(-1) {
 116 }
 117
 118 BlinkAXTreeSource::~BlinkAXTreeSource() {
 119 }
 120
 121 void BlinkAXTreeSource::SetRoot(blink::WebAXObject root) {
 122   root_ = root;
 123 }
 124
 125 bool BlinkAXTreeSource::IsInTree(blink::WebAXObject node) const {
 126   const blink::WebAXObject& root = GetRoot();
 127   while (IsValid(node)) {
 128     if (node.equals(root))
 129       return true;
 130     node = GetParent(node);
 131   }
 132   return false;
 133 }
 134
 135 blink::WebAXObject BlinkAXTreeSource::GetRoot() const {
 136   if (!root_.isNull())
 137     return root_;
 138   return GetMainDocument().accessibilityObject();
 139 }
 140
 141 blink::WebAXObject BlinkAXTreeSource::GetFromId(int32 id) const {
 142   return GetMainDocument().accessibilityObjectFromID(id);
 143 }
 144
 145 int32 BlinkAXTreeSource::GetId(blink::WebAXObject node) const {
 146   return node.axID();
 147 }
 148
 149 void BlinkAXTreeSource::GetChildren(
 150     blink::WebAXObject parent,
 151     std::vector<blink::WebAXObject>* out_children) const {
 152   if (parent.role() == blink::WebAXRoleStaticText) {
 153     blink::WebAXObject ancestor = parent;
 154     while (!ancestor.isDetached()) {
 155       if (ancestor.axID() == accessibility_focus_id_) {
 156         parent.loadInlineTextBoxes();
 157         break;
 158       }
 159       ancestor = ancestor.parentObject();
 160     }
 161   }
 162
 163   bool is_iframe = false;
 164   WebNode node = parent.node();
 165   if (!node.isNull() && node.isElementNode()) {
 166     WebElement element = node.to<WebElement>();
 167     is_iframe = (element.tagName() == ASCIIToUTF16("IFRAME"));
 168   }
 169
 170   for (unsigned i = 0; i < parent.childCount(); i++) {
 171     blink::WebAXObject child = parent.childAt(i);
 172
 173     // The child may be invalid due to issues in blink accessibility code.
 174     if (child.isDetached())
 175       continue;
 176
 177     // Skip children whose parent isn't |parent|.
 178     // As an exception, include children of an iframe element.
 179     if (!is_iframe && !IsParentUnignoredOf(parent, child))
 180       continue;
 181
 182     out_children->push_back(child);
 183   }
 184 }
 185
 186 blink::WebAXObject BlinkAXTreeSource::GetParent(
 187     blink::WebAXObject node) const {
 188   // Blink returns ignored objects when walking up the parent chain,
 189   // we have to skip those here. Also, stop when we get to the root
 190   // element.
 191   blink::WebAXObject root = GetRoot();
 192   do {
 193     if (node.equals(root))
 194       return blink::WebAXObject();
 195     node = node.parentObject();
 196   } while (!node.isDetached() && node.accessibilityIsIgnored());
 197
 198   return node;
 199 }
 200
 201 bool BlinkAXTreeSource::IsValid(blink::WebAXObject node) const {
 202   return !node.isDetached();  // This also checks if it's null.
 203 }
 204
 205 bool BlinkAXTreeSource::IsEqual(blink::WebAXObject node1,
 206                                 blink::WebAXObject node2) const {
 207   return node1.equals(node2);
 208 }
 209
 210 blink::WebAXObject BlinkAXTreeSource::GetNull() const {
 211   return blink::WebAXObject();
 212 }
 213
 214 void BlinkAXTreeSource::SerializeNode(blink::WebAXObject src,
 215                                       AXContentNodeData* dst) const {
 216   dst->role = AXRoleFromBlink(src.role());
 217   dst->state = AXStateFromBlink(src);
 218   dst->location = src.boundingBoxRect();
 219   dst->id = src.axID();
 220   std::string name = UTF16ToUTF8(base::StringPiece16(src.deprecatedTitle()));
 221
 222   std::string value;
 223   if (src.valueDescription().length()) {
 224     dst->AddStringAttribute(ui::AX_ATTR_VALUE,
 225                             UTF16ToUTF8(base::StringPiece16(
 226                                 src.valueDescription())));
 227   } else {
 228     dst->AddStringAttribute(
 229         ui::AX_ATTR_VALUE,
 230         UTF16ToUTF8(base::StringPiece16(src.stringValue())));
 231   }
 232
 233   if (dst->role == ui::AX_ROLE_COLOR_WELL)
 234     dst->AddIntAttribute(ui::AX_ATTR_COLOR_VALUE, src.colorValue());
 235
 236
 237   // Text attributes.
 238   if (src.backgroundColor())
 239     dst->AddIntAttribute(ui::AX_ATTR_BACKGROUND_COLOR, src.backgroundColor());
 240
 241   if (src.color())
 242     dst->AddIntAttribute(ui::AX_ATTR_COLOR, src.color());
 243
 244   // Font size is in pixels.
 245   if (src.fontSize())
 246     dst->AddFloatAttribute(ui::AX_ATTR_FONT_SIZE, src.fontSize());
 247
 248   if (src.invalidState()) {
 249     dst->AddIntAttribute(ui::AX_ATTR_INVALID_STATE,
 250                          AXInvalidStateFromBlink(src.invalidState()));
 251   }
 252   if (src.invalidState() == blink::WebAXInvalidStateOther) {
 253     dst->AddStringAttribute(
 254         ui::AX_ATTR_ARIA_INVALID_VALUE,
 255         UTF16ToUTF8(base::StringPiece16(src.ariaInvalidValue())));
 256   }
 257
 258   if (src.textDirection()) {
 259     dst->AddIntAttribute(ui::AX_ATTR_TEXT_DIRECTION,
 260                          AXTextDirectionFromBlink(src.textDirection()));
 261   }
 262
 263   if (src.textStyle()) {
 264     dst->AddIntAttribute(ui::AX_ATTR_TEXT_STYLE,
 265                          AXTextStyleFromBlink(src.textStyle()));
 266   }
 267
 268
 269   if (dst->role == ui::AX_ROLE_INLINE_TEXT_BOX) {
 270     WebVector<int> src_character_offsets;
 271     src.characterOffsets(src_character_offsets);
 272     std::vector<int32> character_offsets;
 273     character_offsets.reserve(src_character_offsets.size());
 274     for (size_t i = 0; i < src_character_offsets.size(); ++i)
 275       character_offsets.push_back(src_character_offsets[i]);
 276     dst->AddIntListAttribute(ui::AX_ATTR_CHARACTER_OFFSETS, character_offsets);
 277
 278     WebVector<int> src_word_starts;
 279     WebVector<int> src_word_ends;
 280     src.wordBoundaries(src_word_starts, src_word_ends);
 281     std::vector<int32> word_starts;
 282     std::vector<int32> word_ends;
 283     word_starts.reserve(src_word_starts.size());
 284     word_ends.reserve(src_word_starts.size());
 285     for (size_t i = 0; i < src_word_starts.size(); ++i) {
 286       word_starts.push_back(src_word_starts[i]);
 287       word_ends.push_back(src_word_ends[i]);
 288     }
 289     dst->AddIntListAttribute(ui::AX_ATTR_WORD_STARTS, word_starts);
 290     dst->AddIntListAttribute(ui::AX_ATTR_WORD_ENDS, word_ends);
 291   }
 292
 293   if (src.accessKey().length()) {
 294     dst->AddStringAttribute(ui::AX_ATTR_ACCESS_KEY,
 295     UTF16ToUTF8(base::StringPiece16(src.accessKey())));
 296   }
 297
 298   if (src.actionVerb().length())
 299     dst->AddStringAttribute(
 300         ui::AX_ATTR_ACTION,
 301         UTF16ToUTF8(base::StringPiece16(src.actionVerb())));
 302   if (src.ariaAutoComplete().length())
 303     dst->AddStringAttribute(
 304         ui::AX_ATTR_AUTO_COMPLETE,
 305         UTF16ToUTF8(base::StringPiece16(src.ariaAutoComplete())));
 306   if (src.isAriaReadOnly())
 307     dst->AddBoolAttribute(ui::AX_ATTR_ARIA_READONLY, true);
 308   if (src.isButtonStateMixed())
 309     dst->AddBoolAttribute(ui::AX_ATTR_BUTTON_MIXED, true);
 310   if (src.canSetValueAttribute())
 311     dst->AddBoolAttribute(ui::AX_ATTR_CAN_SET_VALUE, true);
 312   if (src.deprecatedAccessibilityDescription().length()) {
 313     dst->AddStringAttribute(
 314         ui::AX_ATTR_DESCRIPTION,
 315         UTF16ToUTF8(base::StringPiece16(
 316             src.deprecatedAccessibilityDescription())));
 317   }
 318   if (src.hasComputedStyle()) {
 319     dst->AddStringAttribute(
 320         ui::AX_ATTR_DISPLAY,
 321         UTF16ToUTF8(base::StringPiece16(src.computedStyleDisplay())));
 322   }
 323   if (src.deprecatedHelpText().length())
 324     dst->AddStringAttribute(
 325         ui::AX_ATTR_HELP,
 326         UTF16ToUTF8(base::StringPiece16((src.deprecatedHelpText()))));
 327   if (src.deprecatedPlaceholder().length()) {
 328     dst->AddStringAttribute(
 329         ui::AX_ATTR_PLACEHOLDER,
 330         UTF16ToUTF8(base::StringPiece16(src.deprecatedPlaceholder())));
 331   }
 332   if (src.keyboardShortcut().length()) {
 333     dst->AddStringAttribute(
 334         ui::AX_ATTR_SHORTCUT,
 335         UTF16ToUTF8(base::StringPiece16(src.keyboardShortcut())));
 336   }
 337   if (!src.deprecatedTitleUIElement().isDetached()) {
 338     dst->AddIntAttribute(ui::AX_ATTR_TITLE_UI_ELEMENT,
 339                          src.deprecatedTitleUIElement().axID());
 340   }
 341   if (!src.ariaActiveDescendant().isDetached()) {
 342     dst->AddIntAttribute(ui::AX_ATTR_ACTIVEDESCENDANT_ID,
 343                          src.ariaActiveDescendant().axID());
 344   }
 345
 346   if (!src.url().isEmpty())
 347     dst->AddStringAttribute(ui::AX_ATTR_URL, src.url().spec());
 348
 349   if (dst->role == ui::AX_ROLE_HEADING)
 350     dst->AddIntAttribute(ui::AX_ATTR_HIERARCHICAL_LEVEL, src.headingLevel());
 351   else if ((dst->role == ui::AX_ROLE_TREE_ITEM ||
 352             dst->role == ui::AX_ROLE_ROW) &&
 353            src.hierarchicalLevel() > 0) {
 354     dst->AddIntAttribute(ui::AX_ATTR_HIERARCHICAL_LEVEL,
 355                          src.hierarchicalLevel());
 356   }
 357
 358   if (src.setSize())
 359     dst->AddIntAttribute(ui::AX_ATTR_SET_SIZE, src.setSize());
 360
 361   if (src.posInSet())
 362     dst->AddIntAttribute(ui::AX_ATTR_POS_IN_SET, src.posInSet());
 363
 364   // Treat the active list box item as focused.
 365   if (dst->role == ui::AX_ROLE_LIST_BOX_OPTION &&
 366       src.isSelectedOptionActive()) {
 367     dst->state |= (1 << ui::AX_STATE_FOCUSED);
 368   }
 369
 370   if (src.canvasHasFallbackContent())
 371     dst->AddBoolAttribute(ui::AX_ATTR_CANVAS_HAS_FALLBACK, true);
 372
 373   WebNode node = src.node();
 374   bool is_iframe = false;
 375
 376   if (!node.isNull() && node.isElementNode()) {
 377     WebElement element = node.to<WebElement>();
 378     is_iframe = (element.tagName() == ASCIIToUTF16("IFRAME"));
 379
 380     // TODO(ctguil): The tagName in WebKit is lower cased but
 381     // HTMLElement::nodeName calls localNameUpper. Consider adding
 382     // a WebElement method that returns the original lower cased tagName.
 383     dst->AddStringAttribute(
 384         ui::AX_ATTR_HTML_TAG,
 385         base::StringToLowerASCII(UTF16ToUTF8(
 386             base::StringPiece16(element.tagName()))));
 387     for (unsigned i = 0; i < element.attributeCount(); ++i) {
 388       std::string name = base::StringToLowerASCII(UTF16ToUTF8(
 389           base::StringPiece16(element.attributeLocalName(i))));
 390       std::string value =
 391           UTF16ToUTF8(base::StringPiece16(element.attributeValue(i)));
 392       dst->html_attributes.push_back(std::make_pair(name, value));
 393     }
 394
 395     if (!src.isReadOnly() || dst->role == ui::AX_ROLE_TEXT_FIELD) {
 396       dst->AddIntAttribute(ui::AX_ATTR_TEXT_SEL_START, src.selectionStart());
 397       dst->AddIntAttribute(ui::AX_ATTR_TEXT_SEL_END, src.selectionEnd());
 398
 399       WebVector<int> src_line_breaks;
 400       src.lineBreaks(src_line_breaks);
 401       if (src_line_breaks.size() > 0) {
 402         std::vector<int32> line_breaks;
 403         line_breaks.reserve(src_line_breaks.size());
 404         for (size_t i = 0; i < src_line_breaks.size(); ++i)
 405           line_breaks.push_back(src_line_breaks[i]);
 406         dst->AddIntListAttribute(ui::AX_ATTR_LINE_BREAKS, line_breaks);
 407       }
 408     }
 409
 410     // ARIA role.
 411     if (element.hasAttribute("role")) {
 412       dst->AddStringAttribute(
 413           ui::AX_ATTR_ROLE,
 414           UTF16ToUTF8(base::StringPiece16(element.getAttribute("role"))));
 415     } else {
 416       std::string role = GetEquivalentAriaRoleString(dst->role);
 417       if (!role.empty())
 418         dst->AddStringAttribute(ui::AX_ATTR_ROLE, role);
 419       else if (dst->role == ui::AX_ROLE_TIME)
 420         dst->AddStringAttribute(ui::AX_ATTR_ROLE, "time");
 421     }
 422
 423     // Browser plugin (used in a <webview>).
 424     BrowserPlugin* browser_plugin = BrowserPlugin::GetFromNode(element);
 425     if (browser_plugin) {
 426       dst->AddContentIntAttribute(
 427           AX_CONTENT_ATTR_CHILD_BROWSER_PLUGIN_INSTANCE_ID,
 428           browser_plugin->browser_plugin_instance_id());
 429     }
 430
 431     // Out-of-process iframe.
 432     if (is_iframe) {
 433       WebFrame* frame = WebFrame::fromFrameOwnerElement(element);
 434
 435       if (frame && frame->isWebRemoteFrame()) {
 436         RenderFrameProxy* render_frame_proxy =
 437             RenderFrameProxy::FromWebFrame(frame);
 438         DCHECK(render_frame_proxy);
 439         dst->AddContentIntAttribute(
 440             AX_CONTENT_ATTR_CHILD_ROUTING_ID,
 441             render_frame_proxy->routing_id());
 442       }
 443     }
 444   }
 445
 446   if (src.isInLiveRegion()) {
 447     dst->AddBoolAttribute(ui::AX_ATTR_LIVE_ATOMIC, src.liveRegionAtomic());
 448     dst->AddBoolAttribute(ui::AX_ATTR_LIVE_BUSY, src.liveRegionBusy());
 449     if (src.liveRegionBusy())
 450       dst->state |= (1 << ui::AX_STATE_BUSY);
 451     if (!src.liveRegionStatus().isEmpty()) {
 452       dst->AddStringAttribute(
 453           ui::AX_ATTR_LIVE_STATUS,
 454           UTF16ToUTF8(base::StringPiece16(src.liveRegionStatus())));
 455     }
 456     dst->AddStringAttribute(
 457         ui::AX_ATTR_LIVE_RELEVANT,
 458         UTF16ToUTF8(base::StringPiece16(src.liveRegionRelevant())));
 459     dst->AddBoolAttribute(ui::AX_ATTR_CONTAINER_LIVE_ATOMIC,
 460                           src.containerLiveRegionAtomic());
 461     dst->AddBoolAttribute(ui::AX_ATTR_CONTAINER_LIVE_BUSY,
 462                           src.containerLiveRegionBusy());
 463     dst->AddStringAttribute(
 464         ui::AX_ATTR_CONTAINER_LIVE_STATUS,
 465         UTF16ToUTF8(base::StringPiece16(src.containerLiveRegionStatus())));
 466     dst->AddStringAttribute(
 467         ui::AX_ATTR_CONTAINER_LIVE_RELEVANT,
 468         UTF16ToUTF8(base::StringPiece16(src.containerLiveRegionRelevant())));
 469   }
 470
 471   if (dst->role == ui::AX_ROLE_PROGRESS_INDICATOR ||
 472       dst->role == ui::AX_ROLE_METER ||
 473       dst->role == ui::AX_ROLE_SCROLL_BAR ||
 474       dst->role == ui::AX_ROLE_SLIDER ||
 475       dst->role == ui::AX_ROLE_SPIN_BUTTON) {
 476     dst->AddFloatAttribute(ui::AX_ATTR_VALUE_FOR_RANGE, src.valueForRange());
 477     dst->AddFloatAttribute(ui::AX_ATTR_MAX_VALUE_FOR_RANGE,
 478                            src.maxValueForRange());
 479     dst->AddFloatAttribute(ui::AX_ATTR_MIN_VALUE_FOR_RANGE,
 480                            src.minValueForRange());
 481   }
 482
 483   if (dst->role == ui::AX_ROLE_WEB_AREA) {
 484     dst->AddStringAttribute(ui::AX_ATTR_HTML_TAG, "#document");
 485     const WebDocument& document = src.document();
 486     if (name.empty())
 487       name = UTF16ToUTF8(base::StringPiece16(document.title()));
 488     dst->AddStringAttribute(
 489         ui::AX_ATTR_DOC_TITLE,
 490         UTF16ToUTF8(base::StringPiece16(document.title())));
 491     dst->AddStringAttribute(ui::AX_ATTR_DOC_URL, document.url().spec());
 492     dst->AddStringAttribute(
 493         ui::AX_ATTR_DOC_MIMETYPE,
 494         document.isXHTMLDocument() ? "text/xhtml" : "text/html");
 495     dst->AddBoolAttribute(ui::AX_ATTR_DOC_LOADED, src.isLoaded());
 496     dst->AddFloatAttribute(ui::AX_ATTR_DOC_LOADING_PROGRESS,
 497                            src.estimatedLoadingProgress());
 498
 499     const WebDocumentType& doctype = document.doctype();
 500     if (!doctype.isNull()) {
 501       dst->AddStringAttribute(
 502           ui::AX_ATTR_DOC_DOCTYPE,
 503           UTF16ToUTF8(base::StringPiece16(doctype.name())));
 504     }
 505
 506     // Get the tree ID for this frame and possibly the parent frame.
 507     WebLocalFrame* web_frame = document.frame();
 508     if (web_frame) {
 509       RenderFrame* render_frame = RenderFrame::FromWebFrame(web_frame);
 510       dst->AddContentIntAttribute(
 511           AX_CONTENT_ATTR_ROUTING_ID,
 512           render_frame->GetRoutingID());
 513
 514       // Get the tree ID for the parent frame, if it's remote.
 515       // (If it's local, it's already part of this same tree.)
 516       blink::WebFrame* parent_web_frame = web_frame->parent();
 517       if (parent_web_frame && parent_web_frame->isWebRemoteFrame()) {
 518         RenderFrameProxy* parent_render_frame_proxy =
 519             RenderFrameProxy::FromWebFrame(parent_web_frame);
 520         dst->AddContentIntAttribute(
 521             AX_CONTENT_ATTR_PARENT_ROUTING_ID,
 522             parent_render_frame_proxy->routing_id());
 523       }
 524     }
 525   }
 526
 527   if (dst->role == ui::AX_ROLE_TABLE) {
 528     int column_count = src.columnCount();
 529     int row_count = src.rowCount();
 530     if (column_count > 0 && row_count > 0) {
 531       std::set<int32> unique_cell_id_set;
 532       std::vector<int32> cell_ids;
 533       std::vector<int32> unique_cell_ids;
 534       dst->AddIntAttribute(ui::AX_ATTR_TABLE_COLUMN_COUNT, column_count);
 535       dst->AddIntAttribute(ui::AX_ATTR_TABLE_ROW_COUNT, row_count);
 536       WebAXObject header = src.headerContainerObject();
 537       if (!header.isDetached())
 538         dst->AddIntAttribute(ui::AX_ATTR_TABLE_HEADER_ID, header.axID());
 539       for (int i = 0; i < column_count * row_count; ++i) {
 540         WebAXObject cell = src.cellForColumnAndRow(
 541             i % column_count, i / column_count);
 542         int cell_id = -1;
 543         if (!cell.isDetached()) {
 544           cell_id = cell.axID();
 545           if (unique_cell_id_set.find(cell_id) == unique_cell_id_set.end()) {
 546             unique_cell_id_set.insert(cell_id);
 547             unique_cell_ids.push_back(cell_id);
 548           }
 549         }
 550         cell_ids.push_back(cell_id);
 551       }
 552       dst->AddIntListAttribute(ui::AX_ATTR_CELL_IDS, cell_ids);
 553       dst->AddIntListAttribute(ui::AX_ATTR_UNIQUE_CELL_IDS, unique_cell_ids);
 554     }
 555   }
 556
 557   if (dst->role == ui::AX_ROLE_ROW) {
 558     dst->AddIntAttribute(ui::AX_ATTR_TABLE_ROW_INDEX, src.rowIndex());
 559     WebAXObject header = src.rowHeader();
 560     if (!header.isDetached())
 561       dst->AddIntAttribute(ui::AX_ATTR_TABLE_ROW_HEADER_ID, header.axID());
 562   }
 563
 564   if (dst->role == ui::AX_ROLE_COLUMN) {
 565     dst->AddIntAttribute(ui::AX_ATTR_TABLE_COLUMN_INDEX, src.columnIndex());
 566     WebAXObject header = src.columnHeader();
 567     if (!header.isDetached())
 568       dst->AddIntAttribute(ui::AX_ATTR_TABLE_COLUMN_HEADER_ID, header.axID());
 569   }
 570
 571   if (dst->role == ui::AX_ROLE_CELL ||
 572       dst->role == ui::AX_ROLE_ROW_HEADER ||
 573       dst->role == ui::AX_ROLE_COLUMN_HEADER) {
 574     dst->AddIntAttribute(ui::AX_ATTR_TABLE_CELL_COLUMN_INDEX,
 575                          src.cellColumnIndex());
 576     dst->AddIntAttribute(ui::AX_ATTR_TABLE_CELL_COLUMN_SPAN,
 577                          src.cellColumnSpan());
 578     dst->AddIntAttribute(ui::AX_ATTR_TABLE_CELL_ROW_INDEX, src.cellRowIndex());
 579     dst->AddIntAttribute(ui::AX_ATTR_TABLE_CELL_ROW_SPAN, src.cellRowSpan());
 580   }
 581
 582   if ((dst->role == ui::AX_ROLE_ROW_HEADER ||
 583       dst->role == ui::AX_ROLE_COLUMN_HEADER) && src.sortDirection()) {
 584     dst->AddIntAttribute(ui::AX_ATTR_SORT_DIRECTION,
 585                          AXSortDirectionFromBlink(src.sortDirection()));
 586   }
 587
 588   dst->AddStringAttribute(ui::AX_ATTR_NAME, name);
 589
 590   // Add the ids of *indirect* children - those who are children of this node,
 591   // but whose parent is *not* this node. One example is a table
 592   // cell, which is a child of both a row and a column. Because the cell's
 593   // parent is the row, the row adds it as a child, and the column adds it
 594   // as an indirect child.
 595   int child_count = src.childCount();
 596   for (int i = 0; i < child_count; ++i) {
 597     WebAXObject child = src.childAt(i);
 598     std::vector<int32> indirect_child_ids;
 599     if (!is_iframe && !child.isDetached() && !IsParentUnignoredOf(src, child))
 600       indirect_child_ids.push_back(child.axID());
 601     if (indirect_child_ids.size() > 0) {
 602       dst->AddIntListAttribute(
 603           ui::AX_ATTR_INDIRECT_CHILD_IDS, indirect_child_ids);
 604     }
 605   }
 606
 607   WebVector<WebAXObject> controls;
 608   if (src.ariaControls(controls))
 609     AddIntListAttributeFromWebObjects(ui::AX_ATTR_CONTROLS_IDS, controls, dst);
 610
 611   WebVector<WebAXObject> describedby;
 612   if (src.deprecatedAriaDescribedby(describedby)) {
 613     AddIntListAttributeFromWebObjects(
 614         ui::AX_ATTR_DESCRIBEDBY_IDS, describedby, dst);
 615   }
 616
 617   WebVector<WebAXObject> flowTo;
 618   if (src.ariaFlowTo(flowTo))
 619     AddIntListAttributeFromWebObjects(ui::AX_ATTR_FLOWTO_IDS, flowTo, dst);
 620
 621   WebVector<WebAXObject> labelledby;
 622   if (src.deprecatedAriaLabelledby(labelledby)) {
 623     AddIntListAttributeFromWebObjects(
 624         ui::AX_ATTR_LABELLEDBY_IDS, labelledby, dst);
 625   }
 626
 627   WebVector<WebAXObject> owns;
 628   if (src.ariaOwns(owns))
 629     AddIntListAttributeFromWebObjects(ui::AX_ATTR_OWNS_IDS, owns, dst);
 630
 631
 632   if (src.isScrollableContainer()) {
 633     const gfx::Point& scrollOffset = src.scrollOffset();
 634     dst->AddIntAttribute(ui::AX_ATTR_SCROLL_X, scrollOffset.x());
 635     dst->AddIntAttribute(ui::AX_ATTR_SCROLL_Y, scrollOffset.y());
 636
 637     const gfx::Point& minScrollOffset = src.minimumScrollOffset();
 638     dst->AddIntAttribute(ui::AX_ATTR_SCROLL_X_MIN, minScrollOffset.x());
 639     dst->AddIntAttribute(ui::AX_ATTR_SCROLL_Y_MIN, minScrollOffset.y());
 640
 641     const gfx::Point& maxScrollOffset = src.maximumScrollOffset();
 642     dst->AddIntAttribute(ui::AX_ATTR_SCROLL_X_MAX, maxScrollOffset.x());
 643     dst->AddIntAttribute(ui::AX_ATTR_SCROLL_Y_MAX, maxScrollOffset.y());
 644   }
 645 }
 646
 647 blink::WebDocument BlinkAXTreeSource::GetMainDocument() const {
 648   if (render_frame_ && render_frame_->GetWebFrame())
 649     return render_frame_->GetWebFrame()->document();
 650   return WebDocument();
 651 }
 652
 653 }  // namespace content