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/renderer/accessibility/blink_ax_enum_conversion.h"
  13 #include "content/renderer/render_view_impl.h"
  14 #include "third_party/WebKit/public/platform/WebRect.h"
  15 #include "third_party/WebKit/public/platform/WebSize.h"
  16 #include "third_party/WebKit/public/platform/WebString.h"
  17 #include "third_party/WebKit/public/platform/WebVector.h"
  18 #include "third_party/WebKit/public/web/WebAXEnums.h"
  19 #include "third_party/WebKit/public/web/WebAXObject.h"
  20 #include "third_party/WebKit/public/web/WebDocument.h"
  21 #include "third_party/WebKit/public/web/WebDocumentType.h"
  22 #include "third_party/WebKit/public/web/WebElement.h"
  23 #include "third_party/WebKit/public/web/WebFormControlElement.h"
  24 #include "third_party/WebKit/public/web/WebInputElement.h"
  25 #include "third_party/WebKit/public/web/WebLocalFrame.h"
  26 #include "third_party/WebKit/public/web/WebNode.h"
  27 #include "third_party/WebKit/public/web/WebView.h"
  28
  29 using base::ASCIIToUTF16;
  30 using base::UTF16ToUTF8;
  31 using blink::WebAXObject;
  32 using blink::WebDocument;
  33 using blink::WebDocumentType;
  34 using blink::WebElement;
  35 using blink::WebLocalFrame;
  36 using blink::WebNode;
  37 using blink::WebVector;
  38 using blink::WebView;
  39
  40 namespace content {
  41
  42 namespace {
  43
  44 // Returns true if |ancestor| is the first unignored parent of |child|,
  45 // which means that when walking up the parent chain from |child|,
  46 // |ancestor| is the *first* ancestor that isn't marked as
  47 // accessibilityIsIgnored().
  48 bool IsParentUnignoredOf(WebAXObject ancestor,
  49                          WebAXObject child) {
  50   WebAXObject parent = child.parentObject();
  51   while (!parent.isDetached() && parent.accessibilityIsIgnored())
  52     parent = parent.parentObject();
  53   return parent.equals(ancestor);
  54 }
  55
  56 bool IsTrue(std::string html_value) {
  57   return LowerCaseEqualsASCII(html_value, "true");
  58 }
  59
  60 std::string GetEquivalentAriaRoleString(const ui::AXRole role) {
  61   switch (role) {
  62     case ui::AX_ROLE_ARTICLE:
  63       return "article";
  64     case ui::AX_ROLE_BANNER:
  65       return "banner";
  66     case ui::AX_ROLE_COMPLEMENTARY:
  67       return "complementary";
  68     case ui::AX_ROLE_CONTENT_INFO:
  69     case ui::AX_ROLE_FOOTER:
  70       return "contentinfo";
  71     case ui::AX_ROLE_MAIN:
  72       return "main";
  73     case ui::AX_ROLE_NAVIGATION:
  74       return "navigation";
  75     case ui::AX_ROLE_REGION:
  76       return "region";
  77     default:
  78       break;
  79   }
  80
  81   return std::string();
  82 }
  83
  84 void AddIntListAttributeFromWebObjects(ui::AXIntListAttribute attr,
  85                                        WebVector<WebAXObject> objects,
  86                                        ui::AXNodeData* dst) {
  87   std::vector<int32> ids;
  88   for(size_t i = 0; i < objects.size(); i++)
  89     ids.push_back(objects[i].axID());
  90   if (ids.size() > 0)
  91     dst->AddIntListAttribute(attr, ids);
  92 }
  93
  94 }  // Anonymous namespace
  95
  96 BlinkAXTreeSource::BlinkAXTreeSource(RenderViewImpl* render_view)
  97     : render_view_(render_view) {
  98 }
  99
 100 BlinkAXTreeSource::~BlinkAXTreeSource() {
 101 }
 102
 103 bool BlinkAXTreeSource::IsInTree(blink::WebAXObject node) const {
 104   const blink::WebAXObject& root = GetRoot();
 105   while (IsValid(node)) {
 106     if (node.equals(root))
 107       return true;
 108     node = GetParent(node);
 109   }
 110   return false;
 111 }
 112
 113 blink::WebAXObject BlinkAXTreeSource::GetRoot() const {
 114   return GetMainDocument().accessibilityObject();
 115 }
 116
 117 blink::WebAXObject BlinkAXTreeSource::GetFromId(int32 id) const {
 118   return GetMainDocument().accessibilityObjectFromID(id);
 119 }
 120
 121 int32 BlinkAXTreeSource::GetId(blink::WebAXObject node) const {
 122   return node.axID();
 123 }
 124
 125 void BlinkAXTreeSource::GetChildren(
 126     blink::WebAXObject parent,
 127     std::vector<blink::WebAXObject>* out_children) const {
 128   bool is_iframe = false;
 129   WebNode node = parent.node();
 130   if (!node.isNull() && node.isElementNode()) {
 131     WebElement element = node.to<WebElement>();
 132     is_iframe = (element.tagName() == ASCIIToUTF16("IFRAME"));
 133   }
 134
 135   for (unsigned i = 0; i < parent.childCount(); i++) {
 136     blink::WebAXObject child = parent.childAt(i);
 137
 138     // The child may be invalid due to issues in blink accessibility code.
 139     if (child.isDetached())
 140       continue;
 141
 142     // Skip children whose parent isn't |parent|.
 143     // As an exception, include children of an iframe element.
 144     if (!is_iframe && !IsParentUnignoredOf(parent, child))
 145       continue;
 146
 147     out_children->push_back(child);
 148   }
 149 }
 150
 151 blink::WebAXObject BlinkAXTreeSource::GetParent(
 152     blink::WebAXObject node) const {
 153   // Blink returns ignored objects when walking up the parent chain,
 154   // we have to skip those here. Also, stop when we get to the root
 155   // element.
 156   blink::WebAXObject root = GetRoot();
 157   do {
 158     if (node.equals(root))
 159       return blink::WebAXObject();
 160     node = node.parentObject();
 161   } while (!node.isDetached() && node.accessibilityIsIgnored());
 162
 163   return node;
 164 }
 165
 166 bool BlinkAXTreeSource::IsValid(blink::WebAXObject node) const {
 167   return !node.isDetached();  // This also checks if it's null.
 168 }
 169
 170 bool BlinkAXTreeSource::IsEqual(blink::WebAXObject node1,
 171                                 blink::WebAXObject node2) const {
 172   return node1.equals(node2);
 173 }
 174
 175 blink::WebAXObject BlinkAXTreeSource::GetNull() const {
 176   return blink::WebAXObject();
 177 }
 178
 179 void BlinkAXTreeSource::SerializeNode(blink::WebAXObject src,
 180                                       ui::AXNodeData* dst) const {
 181   dst->role = AXRoleFromBlink(src.role());
 182   dst->state = AXStateFromBlink(src);
 183   dst->location = src.boundingBoxRect();
 184   dst->id = src.axID();
 185   std::string name = UTF16ToUTF8(src.title());
 186
 187   std::string value;
 188   if (src.valueDescription().length()) {
 189     dst->AddStringAttribute(ui::AX_ATTR_VALUE,
 190                             UTF16ToUTF8(src.valueDescription()));
 191   } else {
 192     dst->AddStringAttribute(ui::AX_ATTR_VALUE, UTF16ToUTF8(src.stringValue()));
 193   }
 194
 195   if (dst->role == ui::AX_ROLE_COLOR_WELL) {
 196     int r, g, b;
 197     src.colorValue(r, g, b);
 198     dst->AddIntAttribute(ui::AX_ATTR_COLOR_VALUE_RED, r);
 199     dst->AddIntAttribute(ui::AX_ATTR_COLOR_VALUE_GREEN, g);
 200     dst->AddIntAttribute(ui::AX_ATTR_COLOR_VALUE_BLUE, b);
 201   }
 202
 203   if (dst->role == ui::AX_ROLE_INLINE_TEXT_BOX) {
 204     dst->AddIntAttribute(ui::AX_ATTR_TEXT_DIRECTION,
 205                          AXTextDirectionFromBlink(src.textDirection()));
 206
 207     WebVector<int> src_character_offsets;
 208     src.characterOffsets(src_character_offsets);
 209     std::vector<int32> character_offsets;
 210     character_offsets.reserve(src_character_offsets.size());
 211     for (size_t i = 0; i < src_character_offsets.size(); ++i)
 212       character_offsets.push_back(src_character_offsets[i]);
 213     dst->AddIntListAttribute(ui::AX_ATTR_CHARACTER_OFFSETS, character_offsets);
 214
 215     WebVector<int> src_word_starts;
 216     WebVector<int> src_word_ends;
 217     src.wordBoundaries(src_word_starts, src_word_ends);
 218     std::vector<int32> word_starts;
 219     std::vector<int32> word_ends;
 220     word_starts.reserve(src_word_starts.size());
 221     word_ends.reserve(src_word_starts.size());
 222     for (size_t i = 0; i < src_word_starts.size(); ++i) {
 223       word_starts.push_back(src_word_starts[i]);
 224       word_ends.push_back(src_word_ends[i]);
 225     }
 226     dst->AddIntListAttribute(ui::AX_ATTR_WORD_STARTS, word_starts);
 227     dst->AddIntListAttribute(ui::AX_ATTR_WORD_ENDS, word_ends);
 228   }
 229
 230   if (src.accessKey().length()) {
 231     dst->AddStringAttribute(ui::AX_ATTR_ACCESS_KEY,
 232     UTF16ToUTF8(src.accessKey()));
 233   }
 234   if (src.actionVerb().length())
 235     dst->AddStringAttribute(ui::AX_ATTR_ACTION, UTF16ToUTF8(src.actionVerb()));
 236   if (src.isAriaReadOnly())
 237     dst->AddBoolAttribute(ui::AX_ATTR_ARIA_READONLY, true);
 238   if (src.isButtonStateMixed())
 239     dst->AddBoolAttribute(ui::AX_ATTR_BUTTON_MIXED, true);
 240   if (src.canSetValueAttribute())
 241     dst->AddBoolAttribute(ui::AX_ATTR_CAN_SET_VALUE, true);
 242   if (src.accessibilityDescription().length()) {
 243     dst->AddStringAttribute(ui::AX_ATTR_DESCRIPTION,
 244                             UTF16ToUTF8(src.accessibilityDescription()));
 245   }
 246   if (src.hasComputedStyle()) {
 247     dst->AddStringAttribute(ui::AX_ATTR_DISPLAY,
 248                             UTF16ToUTF8(src.computedStyleDisplay()));
 249   }
 250   if (src.helpText().length())
 251     dst->AddStringAttribute(ui::AX_ATTR_HELP, UTF16ToUTF8(src.helpText()));
 252   if (src.keyboardShortcut().length()) {
 253     dst->AddStringAttribute(ui::AX_ATTR_SHORTCUT,
 254                             UTF16ToUTF8(src.keyboardShortcut()));
 255   }
 256   if (!src.titleUIElement().isDetached()) {
 257     dst->AddIntAttribute(ui::AX_ATTR_TITLE_UI_ELEMENT,
 258                          src.titleUIElement().axID());
 259   }
 260   if (!src.ariaActiveDescendant().isDetached()) {
 261     dst->AddIntAttribute(ui::AX_ATTR_ACTIVEDESCENDANT_ID,
 262                          src.ariaActiveDescendant().axID());
 263   }
 264
 265   if (!src.url().isEmpty())
 266     dst->AddStringAttribute(ui::AX_ATTR_URL, src.url().spec());
 267
 268   if (dst->role == ui::AX_ROLE_HEADING)
 269     dst->AddIntAttribute(ui::AX_ATTR_HIERARCHICAL_LEVEL, src.headingLevel());
 270   else if ((dst->role == ui::AX_ROLE_TREE_ITEM ||
 271             dst->role == ui::AX_ROLE_ROW) &&
 272            src.hierarchicalLevel() > 0) {
 273     dst->AddIntAttribute(ui::AX_ATTR_HIERARCHICAL_LEVEL,
 274                          src.hierarchicalLevel());
 275   }
 276
 277   // Treat the active list box item as focused.
 278   if (dst->role == ui::AX_ROLE_LIST_BOX_OPTION &&
 279       src.isSelectedOptionActive()) {
 280     dst->state |= (1 << ui::AX_STATE_FOCUSED);
 281   }
 282
 283   if (src.canvasHasFallbackContent())
 284     dst->AddBoolAttribute(ui::AX_ATTR_CANVAS_HAS_FALLBACK, true);
 285
 286   WebNode node = src.node();
 287   bool is_iframe = false;
 288   std::string live_atomic;
 289   std::string live_busy;
 290   std::string live_status;
 291   std::string live_relevant;
 292
 293   if (!node.isNull() && node.isElementNode()) {
 294     WebElement element = node.to<WebElement>();
 295     is_iframe = (element.tagName() == ASCIIToUTF16("IFRAME"));
 296
 297     if (LowerCaseEqualsASCII(element.getAttribute("aria-expanded"), "true"))
 298       dst->state |= (1 << ui::AX_STATE_EXPANDED);
 299
 300     // TODO(ctguil): The tagName in WebKit is lower cased but
 301     // HTMLElement::nodeName calls localNameUpper. Consider adding
 302     // a WebElement method that returns the original lower cased tagName.
 303     dst->AddStringAttribute(
 304         ui::AX_ATTR_HTML_TAG,
 305         StringToLowerASCII(UTF16ToUTF8(element.tagName())));
 306     for (unsigned i = 0; i < element.attributeCount(); ++i) {
 307       std::string name = StringToLowerASCII(UTF16ToUTF8(
 308           element.attributeLocalName(i)));
 309       std::string value = UTF16ToUTF8(element.attributeValue(i));
 310       dst->html_attributes.push_back(std::make_pair(name, value));
 311     }
 312
 313     if (dst->role == ui::AX_ROLE_EDITABLE_TEXT ||
 314         dst->role == ui::AX_ROLE_TEXT_AREA ||
 315         dst->role == ui::AX_ROLE_TEXT_FIELD) {
 316       dst->AddIntAttribute(ui::AX_ATTR_TEXT_SEL_START, src.selectionStart());
 317       dst->AddIntAttribute(ui::AX_ATTR_TEXT_SEL_END, src.selectionEnd());
 318
 319       WebVector<int> src_line_breaks;
 320       src.lineBreaks(src_line_breaks);
 321       if (src_line_breaks.size() > 0) {
 322         std::vector<int32> line_breaks;
 323         line_breaks.reserve(src_line_breaks.size());
 324         for (size_t i = 0; i < src_line_breaks.size(); ++i)
 325           line_breaks.push_back(src_line_breaks[i]);
 326         dst->AddIntListAttribute(ui::AX_ATTR_LINE_BREAKS, line_breaks);
 327       }
 328     }
 329
 330     // ARIA role.
 331     if (element.hasAttribute("role")) {
 332       dst->AddStringAttribute(ui::AX_ATTR_ROLE,
 333                               UTF16ToUTF8(element.getAttribute("role")));
 334     } else {
 335       std::string role = GetEquivalentAriaRoleString(dst->role);
 336       if (!role.empty())
 337         dst->AddStringAttribute(ui::AX_ATTR_ROLE, role);
 338     }
 339
 340     // Live region attributes
 341     live_atomic = UTF16ToUTF8(element.getAttribute("aria-atomic"));
 342     live_busy = UTF16ToUTF8(element.getAttribute("aria-busy"));
 343     live_status = UTF16ToUTF8(element.getAttribute("aria-live"));
 344     live_relevant = UTF16ToUTF8(element.getAttribute("aria-relevant"));
 345   }
 346
 347   // Walk up the parent chain to set live region attributes of containers
 348   std::string container_live_atomic;
 349   std::string container_live_busy;
 350   std::string container_live_status;
 351   std::string container_live_relevant;
 352   WebAXObject container_accessible = src;
 353   while (!container_accessible.isDetached()) {
 354     WebNode container_node = container_accessible.node();
 355     if (!container_node.isNull() && container_node.isElementNode()) {
 356       WebElement container_elem = container_node.to<WebElement>();
 357       if (container_elem.hasAttribute("aria-atomic") &&
 358           container_live_atomic.empty()) {
 359         container_live_atomic =
 360             UTF16ToUTF8(container_elem.getAttribute("aria-atomic"));
 361       }
 362       if (container_elem.hasAttribute("aria-busy") &&
 363           container_live_busy.empty()) {
 364         container_live_busy =
 365             UTF16ToUTF8(container_elem.getAttribute("aria-busy"));
 366       }
 367       if (container_elem.hasAttribute("aria-live") &&
 368           container_live_status.empty()) {
 369         container_live_status =
 370             UTF16ToUTF8(container_elem.getAttribute("aria-live"));
 371       }
 372       if (container_elem.hasAttribute("aria-relevant") &&
 373           container_live_relevant.empty()) {
 374         container_live_relevant =
 375             UTF16ToUTF8(container_elem.getAttribute("aria-relevant"));
 376       }
 377     }
 378     container_accessible = container_accessible.parentObject();
 379   }
 380
 381   if (!live_atomic.empty())
 382     dst->AddBoolAttribute(ui::AX_ATTR_LIVE_ATOMIC, IsTrue(live_atomic));
 383   if (!live_busy.empty())
 384     dst->AddBoolAttribute(ui::AX_ATTR_LIVE_BUSY, IsTrue(live_busy));
 385   if (!live_status.empty())
 386     dst->AddStringAttribute(ui::AX_ATTR_LIVE_STATUS, live_status);
 387   if (!live_relevant.empty())
 388     dst->AddStringAttribute(ui::AX_ATTR_LIVE_RELEVANT, live_relevant);
 389
 390   if (!container_live_atomic.empty()) {
 391     dst->AddBoolAttribute(ui::AX_ATTR_CONTAINER_LIVE_ATOMIC,
 392                           IsTrue(container_live_atomic));
 393   }
 394   if (!container_live_busy.empty()) {
 395     dst->AddBoolAttribute(ui::AX_ATTR_CONTAINER_LIVE_BUSY,
 396                           IsTrue(container_live_busy));
 397   }
 398   if (!container_live_status.empty()) {
 399     dst->AddStringAttribute(ui::AX_ATTR_CONTAINER_LIVE_STATUS,
 400                             container_live_status);
 401   }
 402   if (!container_live_relevant.empty()) {
 403     dst->AddStringAttribute(ui::AX_ATTR_CONTAINER_LIVE_RELEVANT,
 404                             container_live_relevant);
 405   }
 406
 407   if (dst->role == ui::AX_ROLE_PROGRESS_INDICATOR ||
 408       dst->role == ui::AX_ROLE_SCROLL_BAR ||
 409       dst->role == ui::AX_ROLE_SLIDER ||
 410       dst->role == ui::AX_ROLE_SPIN_BUTTON) {
 411     dst->AddFloatAttribute(ui::AX_ATTR_VALUE_FOR_RANGE, src.valueForRange());
 412     dst->AddFloatAttribute(ui::AX_ATTR_MAX_VALUE_FOR_RANGE,
 413                            src.maxValueForRange());
 414     dst->AddFloatAttribute(ui::AX_ATTR_MIN_VALUE_FOR_RANGE,
 415                            src.minValueForRange());
 416   }
 417
 418   if (dst->role == ui::AX_ROLE_DOCUMENT ||
 419       dst->role == ui::AX_ROLE_WEB_AREA) {
 420     dst->AddStringAttribute(ui::AX_ATTR_HTML_TAG, "#document");
 421     const WebDocument& document = src.document();
 422     if (name.empty())
 423       name = UTF16ToUTF8(document.title());
 424     dst->AddStringAttribute(ui::AX_ATTR_DOC_TITLE,
 425                             UTF16ToUTF8(document.title()));
 426     dst->AddStringAttribute(ui::AX_ATTR_DOC_URL, document.url().spec());
 427     dst->AddStringAttribute(
 428         ui::AX_ATTR_DOC_MIMETYPE,
 429         document.isXHTMLDocument() ? "text/xhtml" : "text/html");
 430     dst->AddBoolAttribute(ui::AX_ATTR_DOC_LOADED, src.isLoaded());
 431     dst->AddFloatAttribute(ui::AX_ATTR_DOC_LOADING_PROGRESS,
 432                            src.estimatedLoadingProgress());
 433
 434     const WebDocumentType& doctype = document.doctype();
 435     if (!doctype.isNull()) {
 436       dst->AddStringAttribute(ui::AX_ATTR_DOC_DOCTYPE,
 437                               UTF16ToUTF8(doctype.name()));
 438     }
 439
 440     const gfx::Size& scroll_offset = document.frame()->scrollOffset();
 441     dst->AddIntAttribute(ui::AX_ATTR_SCROLL_X, scroll_offset.width());
 442     dst->AddIntAttribute(ui::AX_ATTR_SCROLL_Y, scroll_offset.height());
 443
 444     const gfx::Size& min_offset = document.frame()->minimumScrollOffset();
 445     dst->AddIntAttribute(ui::AX_ATTR_SCROLL_X_MIN, min_offset.width());
 446     dst->AddIntAttribute(ui::AX_ATTR_SCROLL_Y_MIN, min_offset.height());
 447
 448     const gfx::Size& max_offset = document.frame()->maximumScrollOffset();
 449     dst->AddIntAttribute(ui::AX_ATTR_SCROLL_X_MAX, max_offset.width());
 450     dst->AddIntAttribute(ui::AX_ATTR_SCROLL_Y_MAX, max_offset.height());
 451   }
 452
 453   if (dst->role == ui::AX_ROLE_TABLE) {
 454     int column_count = src.columnCount();
 455     int row_count = src.rowCount();
 456     if (column_count > 0 && row_count > 0) {
 457       std::set<int32> unique_cell_id_set;
 458       std::vector<int32> cell_ids;
 459       std::vector<int32> unique_cell_ids;
 460       dst->AddIntAttribute(ui::AX_ATTR_TABLE_COLUMN_COUNT, column_count);
 461       dst->AddIntAttribute(ui::AX_ATTR_TABLE_ROW_COUNT, row_count);
 462       WebAXObject header = src.headerContainerObject();
 463       if (!header.isDetached())
 464         dst->AddIntAttribute(ui::AX_ATTR_TABLE_HEADER_ID, header.axID());
 465       for (int i = 0; i < column_count * row_count; ++i) {
 466         WebAXObject cell = src.cellForColumnAndRow(
 467             i % column_count, i / column_count);
 468         int cell_id = -1;
 469         if (!cell.isDetached()) {
 470           cell_id = cell.axID();
 471           if (unique_cell_id_set.find(cell_id) == unique_cell_id_set.end()) {
 472             unique_cell_id_set.insert(cell_id);
 473             unique_cell_ids.push_back(cell_id);
 474           }
 475         }
 476         cell_ids.push_back(cell_id);
 477       }
 478       dst->AddIntListAttribute(ui::AX_ATTR_CELL_IDS, cell_ids);
 479       dst->AddIntListAttribute(ui::AX_ATTR_UNIQUE_CELL_IDS, unique_cell_ids);
 480     }
 481   }
 482
 483   if (dst->role == ui::AX_ROLE_ROW) {
 484     dst->AddIntAttribute(ui::AX_ATTR_TABLE_ROW_INDEX, src.rowIndex());
 485     WebAXObject header = src.rowHeader();
 486     if (!header.isDetached())
 487       dst->AddIntAttribute(ui::AX_ATTR_TABLE_ROW_HEADER_ID, header.axID());
 488   }
 489
 490   if (dst->role == ui::AX_ROLE_COLUMN) {
 491     dst->AddIntAttribute(ui::AX_ATTR_TABLE_COLUMN_INDEX, src.columnIndex());
 492     WebAXObject header = src.columnHeader();
 493     if (!header.isDetached())
 494       dst->AddIntAttribute(ui::AX_ATTR_TABLE_COLUMN_HEADER_ID, header.axID());
 495   }
 496
 497   if (dst->role == ui::AX_ROLE_CELL ||
 498       dst->role == ui::AX_ROLE_ROW_HEADER ||
 499       dst->role == ui::AX_ROLE_COLUMN_HEADER) {
 500     dst->AddIntAttribute(ui::AX_ATTR_TABLE_CELL_COLUMN_INDEX,
 501                          src.cellColumnIndex());
 502     dst->AddIntAttribute(ui::AX_ATTR_TABLE_CELL_COLUMN_SPAN,
 503                          src.cellColumnSpan());
 504     dst->AddIntAttribute(ui::AX_ATTR_TABLE_CELL_ROW_INDEX, src.cellRowIndex());
 505     dst->AddIntAttribute(ui::AX_ATTR_TABLE_CELL_ROW_SPAN, src.cellRowSpan());
 506   }
 507
 508   dst->AddStringAttribute(ui::AX_ATTR_NAME, name);
 509
 510   // Add the ids of *indirect* children - those who are children of this node,
 511   // but whose parent is *not* this node. One example is a table
 512   // cell, which is a child of both a row and a column. Because the cell's
 513   // parent is the row, the row adds it as a child, and the column adds it
 514   // as an indirect child.
 515   int child_count = src.childCount();
 516   for (int i = 0; i < child_count; ++i) {
 517     WebAXObject child = src.childAt(i);
 518     std::vector<int32> indirect_child_ids;
 519     if (!is_iframe && !child.isDetached() && !IsParentUnignoredOf(src, child))
 520       indirect_child_ids.push_back(child.axID());
 521     if (indirect_child_ids.size() > 0) {
 522       dst->AddIntListAttribute(
 523           ui::AX_ATTR_INDIRECT_CHILD_IDS, indirect_child_ids);
 524     }
 525   }
 526
 527   WebVector<WebAXObject> controls;
 528   if (src.ariaControls(controls))
 529     AddIntListAttributeFromWebObjects(ui::AX_ATTR_CONTROLS_IDS, controls, dst);
 530
 531   WebVector<WebAXObject> describedby;
 532   if (src.ariaDescribedby(describedby)) {
 533     AddIntListAttributeFromWebObjects(
 534         ui::AX_ATTR_DESCRIBEDBY_IDS, describedby, dst);
 535   }
 536
 537   WebVector<WebAXObject> flowTo;
 538   if (src.ariaFlowTo(flowTo))
 539     AddIntListAttributeFromWebObjects(ui::AX_ATTR_FLOWTO_IDS, flowTo, dst);
 540
 541   WebVector<WebAXObject> labelledby;
 542   if (src.ariaLabelledby(labelledby)) {
 543     AddIntListAttributeFromWebObjects(
 544         ui::AX_ATTR_LABELLEDBY_IDS, labelledby, dst);
 545   }
 546
 547   WebVector<WebAXObject> owns;
 548   if (src.ariaOwns(owns))
 549     AddIntListAttributeFromWebObjects(ui::AX_ATTR_OWNS_IDS, owns, dst);
 550 }
 551
 552 blink::WebDocument BlinkAXTreeSource::GetMainDocument() const {
 553   WebView* view = render_view_->GetWebView();
 554   WebLocalFrame* main_frame =
 555       view ? view->mainFrame()->toWebLocalFrame() : NULL;
 556
 557   if (main_frame)
 558     return main_frame->document();
 559
 560   return WebDocument();
 561 }
 562
 563 }  // namespace content