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