content/browser/accessibility/browser_accessibility_android.cc

   1 // Copyright 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 #include "content/browser/accessibility/browser_accessibility_android.h"
   6
   7 #include "base/i18n/break_iterator.h"
   8 #include "base/strings/string_util.h"
   9 #include "base/strings/stringprintf.h"
  10 #include "base/strings/utf_string_conversions.h"
  11 #include "content/browser/accessibility/browser_accessibility_manager_android.h"
  12 #include "content/common/accessibility_messages.h"
  13
  14 namespace {
  15
  16 // These are enums from android.text.InputType in Java:
  17 enum {
  18   ANDROID_TEXT_INPUTTYPE_TYPE_NULL = 0,
  19   ANDROID_TEXT_INPUTTYPE_TYPE_DATETIME = 0x4,
  20   ANDROID_TEXT_INPUTTYPE_TYPE_DATETIME_DATE = 0x14,
  21   ANDROID_TEXT_INPUTTYPE_TYPE_DATETIME_TIME = 0x24,
  22   ANDROID_TEXT_INPUTTYPE_TYPE_NUMBER = 0x2,
  23   ANDROID_TEXT_INPUTTYPE_TYPE_PHONE = 0x3,
  24   ANDROID_TEXT_INPUTTYPE_TYPE_TEXT = 0x1,
  25   ANDROID_TEXT_INPUTTYPE_TYPE_TEXT_URI = 0x11,
  26   ANDROID_TEXT_INPUTTYPE_TYPE_TEXT_WEB_EDIT_TEXT = 0xa1,
  27   ANDROID_TEXT_INPUTTYPE_TYPE_TEXT_WEB_EMAIL = 0xd1,
  28   ANDROID_TEXT_INPUTTYPE_TYPE_TEXT_WEB_PASSWORD = 0xe1
  29 };
  30
  31 // These are enums from android.view.View in Java:
  32 enum {
  33   ANDROID_VIEW_VIEW_ACCESSIBILITY_LIVE_REGION_NONE = 0,
  34   ANDROID_VIEW_VIEW_ACCESSIBILITY_LIVE_REGION_POLITE = 1,
  35   ANDROID_VIEW_VIEW_ACCESSIBILITY_LIVE_REGION_ASSERTIVE = 2
  36 };
  37
  38 // These are enums from
  39 // android.view.accessibility.AccessibilityNodeInfo.RangeInfo in Java:
  40 enum {
  41   ANDROID_VIEW_ACCESSIBILITY_RANGE_TYPE_FLOAT = 1
  42 };
  43
  44 }  // namespace
  45
  46 namespace content {
  47
  48 // static
  49 BrowserAccessibility* BrowserAccessibility::Create() {
  50   return new BrowserAccessibilityAndroid();
  51 }
  52
  53 BrowserAccessibilityAndroid::BrowserAccessibilityAndroid() {
  54   first_time_ = true;
  55 }
  56
  57 bool BrowserAccessibilityAndroid::IsNative() const {
  58   return true;
  59 }
  60
  61 void BrowserAccessibilityAndroid::OnLocationChanged() {
  62   manager()->NotifyAccessibilityEvent(ui::AX_EVENT_LOCATION_CHANGED, this);
  63 }
  64
  65 bool BrowserAccessibilityAndroid::PlatformIsLeaf() const {
  66   if (InternalChildCount() == 0)
  67     return true;
  68
  69   // Iframes are always allowed to contain children.
  70   if (IsIframe() ||
  71       GetRole() == ui::AX_ROLE_ROOT_WEB_AREA ||
  72       GetRole() == ui::AX_ROLE_WEB_AREA) {
  73     return false;
  74   }
  75
  76   // If it has a focusable child, we definitely can't leave out children.
  77   if (HasFocusableChild())
  78     return false;
  79
  80   // Date and time controls should drop their children.
  81   if (GetRole() == ui::AX_ROLE_DATE || GetRole() == ui::AX_ROLE_TIME)
  82     return true;
  83
  84   // Headings with text can drop their children.
  85   base::string16 name = GetText();
  86   if (GetRole() == ui::AX_ROLE_HEADING && !name.empty())
  87     return true;
  88
  89   // Focusable nodes with text can drop their children.
  90   if (HasState(ui::AX_STATE_FOCUSABLE) && !name.empty())
  91     return true;
  92
  93   // Nodes with only static text as children can drop their children.
  94   if (HasOnlyStaticTextChildren())
  95     return true;
  96
  97   return BrowserAccessibility::PlatformIsLeaf();
  98 }
  99
 100 bool BrowserAccessibilityAndroid::CanScrollForward() const {
 101   if (!IsSlider())
 102     return false;
 103
 104   float value = GetFloatAttribute(ui::AX_ATTR_VALUE_FOR_RANGE);
 105   float max = GetFloatAttribute(ui::AX_ATTR_MAX_VALUE_FOR_RANGE);
 106   return value < max;
 107 }
 108
 109 bool BrowserAccessibilityAndroid::CanScrollBackward() const {
 110   if (!IsSlider())
 111     return false;
 112
 113   float value = GetFloatAttribute(ui::AX_ATTR_VALUE_FOR_RANGE);
 114   float min = GetFloatAttribute(ui::AX_ATTR_MIN_VALUE_FOR_RANGE);
 115   return value > min;
 116 }
 117
 118 bool BrowserAccessibilityAndroid::IsCheckable() const {
 119   bool checkable = false;
 120   bool is_aria_pressed_defined;
 121   bool is_mixed;
 122   GetAriaTristate("aria-pressed", &is_aria_pressed_defined, &is_mixed);
 123   if (GetRole() == ui::AX_ROLE_CHECK_BOX ||
 124       GetRole() == ui::AX_ROLE_RADIO_BUTTON ||
 125       GetRole() == ui::AX_ROLE_MENU_ITEM_CHECK_BOX ||
 126       GetRole() == ui::AX_ROLE_MENU_ITEM_RADIO ||
 127       is_aria_pressed_defined) {
 128     checkable = true;
 129   }
 130   if (HasState(ui::AX_STATE_CHECKED))
 131     checkable = true;
 132   return checkable;
 133 }
 134
 135 bool BrowserAccessibilityAndroid::IsChecked() const {
 136   return (HasState(ui::AX_STATE_CHECKED) || HasState(ui::AX_STATE_PRESSED));
 137 }
 138
 139 bool BrowserAccessibilityAndroid::IsClickable() const {
 140   if (!PlatformIsLeaf())
 141     return false;
 142
 143   return IsFocusable() || !GetText().empty();
 144 }
 145
 146 bool BrowserAccessibilityAndroid::IsCollection() const {
 147   return (GetRole() == ui::AX_ROLE_GRID ||
 148           GetRole() == ui::AX_ROLE_LIST ||
 149           GetRole() == ui::AX_ROLE_LIST_BOX ||
 150           GetRole() == ui::AX_ROLE_DESCRIPTION_LIST ||
 151           GetRole() == ui::AX_ROLE_TABLE ||
 152           GetRole() == ui::AX_ROLE_TREE);
 153 }
 154
 155 bool BrowserAccessibilityAndroid::IsCollectionItem() const {
 156   return (GetRole() == ui::AX_ROLE_CELL ||
 157           GetRole() == ui::AX_ROLE_COLUMN_HEADER ||
 158           GetRole() == ui::AX_ROLE_DESCRIPTION_LIST_TERM ||
 159           GetRole() == ui::AX_ROLE_LIST_BOX_OPTION ||
 160           GetRole() == ui::AX_ROLE_LIST_ITEM ||
 161           GetRole() == ui::AX_ROLE_ROW_HEADER ||
 162           GetRole() == ui::AX_ROLE_TREE_ITEM);
 163 }
 164
 165 bool BrowserAccessibilityAndroid::IsContentInvalid() const {
 166   std::string invalid;
 167   return GetHtmlAttribute("aria-invalid", &invalid);
 168 }
 169
 170 bool BrowserAccessibilityAndroid::IsDismissable() const {
 171   return false;  // No concept of "dismissable" on the web currently.
 172 }
 173
 174 bool BrowserAccessibilityAndroid::IsEditableText() const {
 175   return (GetRole() == ui::AX_ROLE_TEXT_AREA ||
 176           GetRole() == ui::AX_ROLE_TEXT_FIELD);
 177 }
 178
 179 bool BrowserAccessibilityAndroid::IsEnabled() const {
 180   return HasState(ui::AX_STATE_ENABLED);
 181 }
 182
 183 bool BrowserAccessibilityAndroid::IsFocusable() const {
 184   bool focusable = HasState(ui::AX_STATE_FOCUSABLE);
 185   if (IsIframe() ||
 186       GetRole() == ui::AX_ROLE_WEB_AREA) {
 187     focusable = false;
 188   }
 189   return focusable;
 190 }
 191
 192 bool BrowserAccessibilityAndroid::IsFocused() const {
 193   return manager()->GetFocus(manager()->GetRoot()) == this;
 194 }
 195
 196 bool BrowserAccessibilityAndroid::IsHeading() const {
 197   return (GetRole() == ui::AX_ROLE_COLUMN_HEADER ||
 198           GetRole() == ui::AX_ROLE_HEADING ||
 199           GetRole() == ui::AX_ROLE_ROW_HEADER);
 200 }
 201
 202 bool BrowserAccessibilityAndroid::IsHierarchical() const {
 203   return (GetRole() == ui::AX_ROLE_LIST ||
 204           GetRole() == ui::AX_ROLE_DESCRIPTION_LIST ||
 205           GetRole() == ui::AX_ROLE_TREE);
 206 }
 207
 208 bool BrowserAccessibilityAndroid::IsLink() const {
 209   return (GetRole() == ui::AX_ROLE_LINK ||
 210          GetRole() == ui::AX_ROLE_IMAGE_MAP_LINK);
 211 }
 212
 213 bool BrowserAccessibilityAndroid::IsMultiLine() const {
 214   return GetRole() == ui::AX_ROLE_TEXT_AREA;
 215 }
 216
 217 bool BrowserAccessibilityAndroid::IsPassword() const {
 218   return HasState(ui::AX_STATE_PROTECTED);
 219 }
 220
 221 bool BrowserAccessibilityAndroid::IsRangeType() const {
 222   return (GetRole() == ui::AX_ROLE_PROGRESS_INDICATOR ||
 223           GetRole() == ui::AX_ROLE_METER ||
 224           GetRole() == ui::AX_ROLE_SCROLL_BAR ||
 225           GetRole() == ui::AX_ROLE_SLIDER);
 226 }
 227
 228 bool BrowserAccessibilityAndroid::IsScrollable() const {
 229   int dummy;
 230   return GetIntAttribute(ui::AX_ATTR_SCROLL_X_MAX, &dummy);
 231 }
 232
 233 bool BrowserAccessibilityAndroid::IsSelected() const {
 234   return HasState(ui::AX_STATE_SELECTED);
 235 }
 236
 237 bool BrowserAccessibilityAndroid::IsSlider() const {
 238   return GetRole() == ui::AX_ROLE_SLIDER;
 239 }
 240
 241 bool BrowserAccessibilityAndroid::IsVisibleToUser() const {
 242   return !HasState(ui::AX_STATE_INVISIBLE);
 243 }
 244
 245 bool BrowserAccessibilityAndroid::CanOpenPopup() const {
 246   return HasState(ui::AX_STATE_HASPOPUP);
 247 }
 248
 249 const char* BrowserAccessibilityAndroid::GetClassName() const {
 250   const char* class_name = NULL;
 251
 252   switch (GetRole()) {
 253     case ui::AX_ROLE_SPIN_BUTTON:
 254     case ui::AX_ROLE_TEXT_AREA:
 255     case ui::AX_ROLE_TEXT_FIELD:
 256       class_name = "android.widget.EditText";
 257       break;
 258     case ui::AX_ROLE_SLIDER:
 259       class_name = "android.widget.SeekBar";
 260       break;
 261     case ui::AX_ROLE_COLOR_WELL:
 262     case ui::AX_ROLE_COMBO_BOX:
 263     case ui::AX_ROLE_DATE:
 264     case ui::AX_ROLE_POP_UP_BUTTON:
 265     case ui::AX_ROLE_TIME:
 266       class_name = "android.widget.Spinner";
 267       break;
 268     case ui::AX_ROLE_BUTTON:
 269     case ui::AX_ROLE_MENU_BUTTON:
 270       class_name = "android.widget.Button";
 271       break;
 272     case ui::AX_ROLE_CHECK_BOX:
 273       class_name = "android.widget.CheckBox";
 274       break;
 275     case ui::AX_ROLE_RADIO_BUTTON:
 276       class_name = "android.widget.RadioButton";
 277       break;
 278     case ui::AX_ROLE_TOGGLE_BUTTON:
 279       class_name = "android.widget.ToggleButton";
 280       break;
 281     case ui::AX_ROLE_CANVAS:
 282     case ui::AX_ROLE_IMAGE:
 283     case ui::AX_ROLE_SVG_ROOT:
 284       class_name = "android.widget.Image";
 285       break;
 286     case ui::AX_ROLE_METER:
 287     case ui::AX_ROLE_PROGRESS_INDICATOR:
 288       class_name = "android.widget.ProgressBar";
 289       break;
 290     case ui::AX_ROLE_TAB_LIST:
 291       class_name = "android.widget.TabWidget";
 292       break;
 293     case ui::AX_ROLE_GRID:
 294     case ui::AX_ROLE_TABLE:
 295       class_name = "android.widget.GridView";
 296       break;
 297     case ui::AX_ROLE_LIST:
 298     case ui::AX_ROLE_LIST_BOX:
 299     case ui::AX_ROLE_DESCRIPTION_LIST:
 300       class_name = "android.widget.ListView";
 301       break;
 302     case ui::AX_ROLE_DIALOG:
 303       class_name = "android.app.Dialog";
 304       break;
 305     case ui::AX_ROLE_ROOT_WEB_AREA:
 306       class_name = "android.webkit.WebView";
 307       break;
 308     case ui::AX_ROLE_MENU_ITEM:
 309     case ui::AX_ROLE_MENU_ITEM_CHECK_BOX:
 310     case ui::AX_ROLE_MENU_ITEM_RADIO:
 311       class_name = "android.view.MenuItem";
 312       break;
 313     default:
 314       class_name = "android.view.View";
 315       break;
 316   }
 317
 318   return class_name;
 319 }
 320
 321 base::string16 BrowserAccessibilityAndroid::GetText() const {
 322   if (IsIframe() ||
 323       GetRole() == ui::AX_ROLE_WEB_AREA) {
 324     return base::string16();
 325   }
 326
 327   // See comment in browser_accessibility_win.cc for details.
 328   // The difference here is that we can only expose one accessible
 329   // name on Android, not 2 or 3 like on Windows or Mac.
 330
 331   // First, always return the |value| attribute if this is an
 332   // input field.
 333   if (!value().empty()) {
 334     if (HasState(ui::AX_STATE_EDITABLE))
 335       return base::UTF8ToUTF16(value());
 336
 337     switch (GetRole()) {
 338       case ui::AX_ROLE_COMBO_BOX:
 339       case ui::AX_ROLE_POP_UP_BUTTON:
 340       case ui::AX_ROLE_TEXT_AREA:
 341       case ui::AX_ROLE_TEXT_FIELD:
 342         return base::UTF8ToUTF16(value());
 343     }
 344   }
 345
 346   // For color wells, the color is stored in separate attributes.
 347   // Perhaps we could return color names in the future?
 348   if (GetRole() == ui::AX_ROLE_COLOR_WELL) {
 349     int red = GetIntAttribute(ui::AX_ATTR_COLOR_VALUE_RED);
 350     int green = GetIntAttribute(ui::AX_ATTR_COLOR_VALUE_GREEN);
 351     int blue = GetIntAttribute(ui::AX_ATTR_COLOR_VALUE_BLUE);
 352     return base::UTF8ToUTF16(
 353         base::StringPrintf("#%02X%02X%02X", red, green, blue));
 354   }
 355
 356   // Always prefer visible text if this is a link. Sites sometimes add
 357   // a "title" attribute to a link with more information, but we can't
 358   // lose the link text.
 359   if (!name().empty() && GetRole() == ui::AX_ROLE_LINK)
 360     return base::UTF8ToUTF16(name());
 361
 362   // If there's no text value, the basic rule is: prefer description
 363   // (aria-labelledby or aria-label), then help (title), then name
 364   // (inner text), then value (control value).  However, if
 365   // title_elem_id is set, that means there's a label element
 366   // supplying the name and then name takes precedence over help.
 367   // TODO(dmazzoni): clean this up by providing more granular labels in
 368   // Blink, making the platform-specific mapping to accessible text simpler.
 369   base::string16 description = GetString16Attribute(ui::AX_ATTR_DESCRIPTION);
 370   base::string16 help = GetString16Attribute(ui::AX_ATTR_HELP);
 371
 372   base::string16 placeholder;
 373   switch (GetRole()) {
 374     case ui::AX_ROLE_DATE:
 375     case ui::AX_ROLE_TEXT_AREA:
 376     case ui::AX_ROLE_TEXT_FIELD:
 377     case ui::AX_ROLE_TIME:
 378       GetHtmlAttribute("placeholder", &placeholder);
 379   }
 380
 381   int title_elem_id = GetIntAttribute(
 382       ui::AX_ATTR_TITLE_UI_ELEMENT);
 383   base::string16 text;
 384   if (!description.empty())
 385     text = description;
 386   else if (title_elem_id && !name().empty())
 387     text = base::UTF8ToUTF16(name());
 388   else if (!help.empty())
 389     text = help;
 390   else if (!name().empty())
 391     text = base::UTF8ToUTF16(name());
 392   else if (!placeholder.empty())
 393     text = placeholder;
 394   else if (!value().empty())
 395     text = base::UTF8ToUTF16(value());
 396   else if (title_elem_id) {
 397     BrowserAccessibility* title_elem =
 398           manager()->GetFromID(title_elem_id);
 399     if (title_elem)
 400       text = static_cast<BrowserAccessibilityAndroid*>(title_elem)->GetText();
 401   }
 402
 403   // This is called from PlatformIsLeaf, so don't call PlatformChildCount
 404   // from within this!
 405   if (text.empty() &&
 406       (HasOnlyStaticTextChildren() ||
 407        (IsFocusable() && HasOnlyTextAndImageChildren()))) {
 408     for (uint32 i = 0; i < InternalChildCount(); i++) {
 409       BrowserAccessibility* child = InternalGetChild(i);
 410       text += static_cast<BrowserAccessibilityAndroid*>(child)->GetText();
 411     }
 412   }
 413
 414   if (text.empty() && (IsLink() || GetRole() == ui::AX_ROLE_IMAGE)) {
 415     base::string16 url = GetString16Attribute(ui::AX_ATTR_URL);
 416     // Given a url like http://foo.com/bar/baz.png, just return the
 417     // base name, e.g., "baz".
 418     int trailing_slashes = 0;
 419     while (url.size() - trailing_slashes > 0 &&
 420            url[url.size() - trailing_slashes - 1] == '/') {
 421       trailing_slashes++;
 422     }
 423     if (trailing_slashes)
 424       url = url.substr(0, url.size() - trailing_slashes);
 425     size_t slash_index = url.rfind('/');
 426     if (slash_index != std::string::npos)
 427       url = url.substr(slash_index + 1);
 428     size_t dot_index = url.rfind('.');
 429     if (dot_index != std::string::npos)
 430       url = url.substr(0, dot_index);
 431     text = url;
 432   }
 433
 434   return text;
 435 }
 436
 437 int BrowserAccessibilityAndroid::GetItemIndex() const {
 438   int index = 0;
 439   switch (GetRole()) {
 440     case ui::AX_ROLE_LIST_ITEM:
 441     case ui::AX_ROLE_LIST_BOX_OPTION:
 442     case ui::AX_ROLE_TREE_ITEM:
 443       index = GetIndexInParent();
 444       break;
 445     case ui::AX_ROLE_SLIDER:
 446     case ui::AX_ROLE_PROGRESS_INDICATOR: {
 447       // Return a percentage here for live feedback in an AccessibilityEvent.
 448       // The exact value is returned in RangeCurrentValue.
 449       float min = GetFloatAttribute(ui::AX_ATTR_MIN_VALUE_FOR_RANGE);
 450       float max = GetFloatAttribute(ui::AX_ATTR_MAX_VALUE_FOR_RANGE);
 451       float value = GetFloatAttribute(ui::AX_ATTR_VALUE_FOR_RANGE);
 452       if (max > min && value >= min && value <= max)
 453         index = static_cast<int>(((value - min)) * 100 / (max - min));
 454       break;
 455     }
 456   }
 457   return index;
 458 }
 459
 460 int BrowserAccessibilityAndroid::GetItemCount() const {
 461   int count = 0;
 462   switch (GetRole()) {
 463     case ui::AX_ROLE_LIST:
 464     case ui::AX_ROLE_LIST_BOX:
 465     case ui::AX_ROLE_DESCRIPTION_LIST:
 466       count = PlatformChildCount();
 467       break;
 468     case ui::AX_ROLE_SLIDER:
 469     case ui::AX_ROLE_PROGRESS_INDICATOR:
 470       // An AccessibilityEvent can only return integer information about a
 471       // seek control, so we return a percentage. The real range is returned
 472       // in RangeMin and RangeMax.
 473       count = 100;
 474       break;
 475   }
 476   return count;
 477 }
 478
 479 int BrowserAccessibilityAndroid::GetScrollX() const {
 480   int value = 0;
 481   GetIntAttribute(ui::AX_ATTR_SCROLL_X, &value);
 482   return value;
 483 }
 484
 485 int BrowserAccessibilityAndroid::GetScrollY() const {
 486   int value = 0;
 487   GetIntAttribute(ui::AX_ATTR_SCROLL_Y, &value);
 488   return value;
 489 }
 490
 491 int BrowserAccessibilityAndroid::GetMaxScrollX() const {
 492   int value = 0;
 493   GetIntAttribute(ui::AX_ATTR_SCROLL_X_MAX, &value);
 494   return value;
 495 }
 496
 497 int BrowserAccessibilityAndroid::GetMaxScrollY() const {
 498   int value = 0;
 499   GetIntAttribute(ui::AX_ATTR_SCROLL_Y_MAX, &value);
 500   return value;
 501 }
 502
 503 int BrowserAccessibilityAndroid::GetTextChangeFromIndex() const {
 504   size_t index = 0;
 505   while (index < old_value_.length() &&
 506          index < new_value_.length() &&
 507          old_value_[index] == new_value_[index]) {
 508     index++;
 509   }
 510   return index;
 511 }
 512
 513 int BrowserAccessibilityAndroid::GetTextChangeAddedCount() const {
 514   size_t old_len = old_value_.length();
 515   size_t new_len = new_value_.length();
 516   size_t left = 0;
 517   while (left < old_len &&
 518          left < new_len &&
 519          old_value_[left] == new_value_[left]) {
 520     left++;
 521   }
 522   size_t right = 0;
 523   while (right < old_len &&
 524          right < new_len &&
 525          old_value_[old_len - right - 1] == new_value_[new_len - right - 1]) {
 526     right++;
 527   }
 528   return (new_len - left - right);
 529 }
 530
 531 int BrowserAccessibilityAndroid::GetTextChangeRemovedCount() const {
 532   size_t old_len = old_value_.length();
 533   size_t new_len = new_value_.length();
 534   size_t left = 0;
 535   while (left < old_len &&
 536          left < new_len &&
 537          old_value_[left] == new_value_[left]) {
 538     left++;
 539   }
 540   size_t right = 0;
 541   while (right < old_len &&
 542          right < new_len &&
 543          old_value_[old_len - right - 1] == new_value_[new_len - right - 1]) {
 544     right++;
 545   }
 546   return (old_len - left - right);
 547 }
 548
 549 base::string16 BrowserAccessibilityAndroid::GetTextChangeBeforeText() const {
 550   return old_value_;
 551 }
 552
 553 int BrowserAccessibilityAndroid::GetSelectionStart() const {
 554   int sel_start = 0;
 555   GetIntAttribute(ui::AX_ATTR_TEXT_SEL_START, &sel_start);
 556   return sel_start;
 557 }
 558
 559 int BrowserAccessibilityAndroid::GetSelectionEnd() const {
 560   int sel_end = 0;
 561   GetIntAttribute(ui::AX_ATTR_TEXT_SEL_END, &sel_end);
 562   return sel_end;
 563 }
 564
 565 int BrowserAccessibilityAndroid::GetEditableTextLength() const {
 566   return value().length();
 567 }
 568
 569 int BrowserAccessibilityAndroid::AndroidInputType() const {
 570   std::string html_tag = GetStringAttribute(
 571       ui::AX_ATTR_HTML_TAG);
 572   if (html_tag != "input")
 573     return ANDROID_TEXT_INPUTTYPE_TYPE_NULL;
 574
 575   std::string type;
 576   if (!GetHtmlAttribute("type", &type))
 577     return ANDROID_TEXT_INPUTTYPE_TYPE_TEXT;
 578
 579   if (type.empty() || type == "text" || type == "search")
 580     return ANDROID_TEXT_INPUTTYPE_TYPE_TEXT;
 581   else if (type == "date")
 582     return ANDROID_TEXT_INPUTTYPE_TYPE_DATETIME_DATE;
 583   else if (type == "datetime" || type == "datetime-local")
 584     return ANDROID_TEXT_INPUTTYPE_TYPE_DATETIME;
 585   else if (type == "email")
 586     return ANDROID_TEXT_INPUTTYPE_TYPE_TEXT_WEB_EMAIL;
 587   else if (type == "month")
 588     return ANDROID_TEXT_INPUTTYPE_TYPE_DATETIME_DATE;
 589   else if (type == "number")
 590     return ANDROID_TEXT_INPUTTYPE_TYPE_NUMBER;
 591   else if (type == "password")
 592     return ANDROID_TEXT_INPUTTYPE_TYPE_TEXT_WEB_PASSWORD;
 593   else if (type == "tel")
 594     return ANDROID_TEXT_INPUTTYPE_TYPE_PHONE;
 595   else if (type == "time")
 596     return ANDROID_TEXT_INPUTTYPE_TYPE_DATETIME_TIME;
 597   else if (type == "url")
 598     return ANDROID_TEXT_INPUTTYPE_TYPE_TEXT_URI;
 599   else if (type == "week")
 600     return ANDROID_TEXT_INPUTTYPE_TYPE_DATETIME;
 601
 602   return ANDROID_TEXT_INPUTTYPE_TYPE_NULL;
 603 }
 604
 605 int BrowserAccessibilityAndroid::AndroidLiveRegionType() const {
 606   std::string live = GetStringAttribute(
 607       ui::AX_ATTR_LIVE_STATUS);
 608   if (live == "polite")
 609     return ANDROID_VIEW_VIEW_ACCESSIBILITY_LIVE_REGION_POLITE;
 610   else if (live == "assertive")
 611     return ANDROID_VIEW_VIEW_ACCESSIBILITY_LIVE_REGION_ASSERTIVE;
 612   return ANDROID_VIEW_VIEW_ACCESSIBILITY_LIVE_REGION_NONE;
 613 }
 614
 615 int BrowserAccessibilityAndroid::AndroidRangeType() const {
 616   return ANDROID_VIEW_ACCESSIBILITY_RANGE_TYPE_FLOAT;
 617 }
 618
 619 int BrowserAccessibilityAndroid::RowCount() const {
 620   if (GetRole() == ui::AX_ROLE_GRID ||
 621       GetRole() == ui::AX_ROLE_TABLE) {
 622     return CountChildrenWithRole(ui::AX_ROLE_ROW);
 623   }
 624
 625   if (GetRole() == ui::AX_ROLE_LIST ||
 626       GetRole() == ui::AX_ROLE_LIST_BOX ||
 627       GetRole() == ui::AX_ROLE_DESCRIPTION_LIST ||
 628       GetRole() == ui::AX_ROLE_TREE) {
 629     return PlatformChildCount();
 630   }
 631
 632   return 0;
 633 }
 634
 635 int BrowserAccessibilityAndroid::ColumnCount() const {
 636   if (GetRole() == ui::AX_ROLE_GRID ||
 637       GetRole() == ui::AX_ROLE_TABLE) {
 638     return CountChildrenWithRole(ui::AX_ROLE_COLUMN);
 639   }
 640   return 0;
 641 }
 642
 643 int BrowserAccessibilityAndroid::RowIndex() const {
 644   if (GetRole() == ui::AX_ROLE_LIST_ITEM ||
 645       GetRole() == ui::AX_ROLE_LIST_BOX_OPTION ||
 646       GetRole() == ui::AX_ROLE_TREE_ITEM) {
 647     return GetIndexInParent();
 648   }
 649
 650   return GetIntAttribute(ui::AX_ATTR_TABLE_CELL_ROW_INDEX);
 651 }
 652
 653 int BrowserAccessibilityAndroid::RowSpan() const {
 654   return GetIntAttribute(ui::AX_ATTR_TABLE_CELL_ROW_SPAN);
 655 }
 656
 657 int BrowserAccessibilityAndroid::ColumnIndex() const {
 658   return GetIntAttribute(ui::AX_ATTR_TABLE_CELL_COLUMN_INDEX);
 659 }
 660
 661 int BrowserAccessibilityAndroid::ColumnSpan() const {
 662   return GetIntAttribute(ui::AX_ATTR_TABLE_CELL_COLUMN_SPAN);
 663 }
 664
 665 float BrowserAccessibilityAndroid::RangeMin() const {
 666   return GetFloatAttribute(ui::AX_ATTR_MIN_VALUE_FOR_RANGE);
 667 }
 668
 669 float BrowserAccessibilityAndroid::RangeMax() const {
 670   return GetFloatAttribute(ui::AX_ATTR_MAX_VALUE_FOR_RANGE);
 671 }
 672
 673 float BrowserAccessibilityAndroid::RangeCurrentValue() const {
 674   return GetFloatAttribute(ui::AX_ATTR_VALUE_FOR_RANGE);
 675 }
 676
 677 void BrowserAccessibilityAndroid::GetGranularityBoundaries(
 678     int granularity,
 679     std::vector<int32>* starts,
 680     std::vector<int32>* ends,
 681     int offset) {
 682   switch (granularity) {
 683     case ANDROID_ACCESSIBILITY_NODE_INFO_MOVEMENT_GRANULARITY_LINE:
 684       GetLineBoundaries(starts, ends, offset);
 685       break;
 686     case ANDROID_ACCESSIBILITY_NODE_INFO_MOVEMENT_GRANULARITY_WORD:
 687       GetWordBoundaries(starts, ends, offset);
 688       break;
 689     default:
 690       NOTREACHED();
 691   }
 692 }
 693
 694 void BrowserAccessibilityAndroid::GetLineBoundaries(
 695     std::vector<int32>* line_starts,
 696     std::vector<int32>* line_ends,
 697     int offset) {
 698   // If this node has no children, treat it as all one line.
 699   if (GetText().size() > 0 && !InternalChildCount()) {
 700     line_starts->push_back(offset);
 701     line_ends->push_back(offset + GetText().size());
 702   }
 703
 704   // If this is a static text node, get the line boundaries from the
 705   // inline text boxes if possible.
 706   if (GetRole() == ui::AX_ROLE_STATIC_TEXT) {
 707     int last_y = 0;
 708     for (uint32 i = 0; i < InternalChildCount(); i++) {
 709       BrowserAccessibilityAndroid* child =
 710           static_cast<BrowserAccessibilityAndroid*>(InternalGetChild(i));
 711       CHECK_EQ(ui::AX_ROLE_INLINE_TEXT_BOX, child->GetRole());
 712       // TODO(dmazzoni): replace this with a proper API to determine
 713       // if two inline text boxes are on the same line. http://crbug.com/421771
 714       int y = child->GetLocation().y();
 715       if (i == 0) {
 716         line_starts->push_back(offset);
 717       } else if (y != last_y) {
 718         line_ends->push_back(offset);
 719         line_starts->push_back(offset);
 720       }
 721       offset += child->GetText().size();
 722       last_y = y;
 723     }
 724     line_ends->push_back(offset);
 725     return;
 726   }
 727
 728   // Otherwise, call GetLineBoundaries recursively on the children.
 729   for (uint32 i = 0; i < InternalChildCount(); i++) {
 730     BrowserAccessibilityAndroid* child =
 731         static_cast<BrowserAccessibilityAndroid*>(InternalGetChild(i));
 732     child->GetLineBoundaries(line_starts, line_ends, offset);
 733     offset += child->GetText().size();
 734   }
 735 }
 736
 737 void BrowserAccessibilityAndroid::GetWordBoundaries(
 738     std::vector<int32>* word_starts,
 739     std::vector<int32>* word_ends,
 740     int offset) {
 741   if (GetRole() == ui::AX_ROLE_INLINE_TEXT_BOX) {
 742     const std::vector<int32>& starts = GetIntListAttribute(
 743         ui::AX_ATTR_WORD_STARTS);
 744     const std::vector<int32>& ends = GetIntListAttribute(
 745         ui::AX_ATTR_WORD_ENDS);
 746     for (size_t i = 0; i < starts.size(); ++i) {
 747       word_starts->push_back(offset + starts[i]);
 748       word_ends->push_back(offset + ends[i]);
 749     }
 750     return;
 751   }
 752
 753   base::string16 concatenated_text;
 754   for (uint32 i = 0; i < InternalChildCount(); i++) {
 755     BrowserAccessibilityAndroid* child =
 756         static_cast<BrowserAccessibilityAndroid*>(InternalGetChild(i));
 757     base::string16 child_text = child->GetText();
 758     concatenated_text += child->GetText();
 759   }
 760
 761   base::string16 text = GetText();
 762   if (text.empty() || concatenated_text == text) {
 763     // Great - this node is just the concatenation of its children, so
 764     // we can get the word boundaries recursively.
 765     for (uint32 i = 0; i < InternalChildCount(); i++) {
 766       BrowserAccessibilityAndroid* child =
 767           static_cast<BrowserAccessibilityAndroid*>(InternalGetChild(i));
 768       child->GetWordBoundaries(word_starts, word_ends, offset);
 769       offset += child->GetText().size();
 770     }
 771   } else {
 772     // This node has its own accessible text that doesn't match its
 773     // visible text - like alt text for an image or something with an
 774     // aria-label, so split the text into words locally.
 775     base::i18n::BreakIterator iter(text, base::i18n::BreakIterator::BREAK_WORD);
 776     if (!iter.Init())
 777       return;
 778     while (iter.Advance()) {
 779       if (iter.IsWord()) {
 780         word_starts->push_back(iter.prev());
 781         word_ends->push_back(iter.pos());
 782       }
 783     }
 784   }
 785 }
 786
 787 bool BrowserAccessibilityAndroid::HasFocusableChild() const {
 788   // This is called from PlatformIsLeaf, so don't call PlatformChildCount
 789   // from within this!
 790   for (uint32 i = 0; i < InternalChildCount(); i++) {
 791     BrowserAccessibility* child = InternalGetChild(i);
 792     if (child->HasState(ui::AX_STATE_FOCUSABLE))
 793       return true;
 794     if (static_cast<BrowserAccessibilityAndroid*>(child)->HasFocusableChild())
 795       return true;
 796   }
 797   return false;
 798 }
 799
 800 bool BrowserAccessibilityAndroid::HasOnlyStaticTextChildren() const {
 801   // This is called from PlatformIsLeaf, so don't call PlatformChildCount
 802   // from within this!
 803   for (uint32 i = 0; i < InternalChildCount(); i++) {
 804     BrowserAccessibility* child = InternalGetChild(i);
 805     if (child->GetRole() != ui::AX_ROLE_STATIC_TEXT)
 806       return false;
 807   }
 808   return true;
 809 }
 810
 811 bool BrowserAccessibilityAndroid::HasOnlyTextAndImageChildren() const {
 812   // This is called from PlatformIsLeaf, so don't call PlatformChildCount
 813   // from within this!
 814   for (uint32 i = 0; i < InternalChildCount(); i++) {
 815     BrowserAccessibility* child = InternalGetChild(i);
 816     if (child->GetRole() != ui::AX_ROLE_STATIC_TEXT &&
 817         child->GetRole() != ui::AX_ROLE_IMAGE) {
 818       return false;
 819     }
 820   }
 821   return true;
 822 }
 823
 824 bool BrowserAccessibilityAndroid::IsIframe() const {
 825   base::string16 html_tag = GetString16Attribute(
 826       ui::AX_ATTR_HTML_TAG);
 827   return html_tag == base::ASCIIToUTF16("iframe");
 828 }
 829
 830 void BrowserAccessibilityAndroid::OnDataChanged() {
 831   BrowserAccessibility::OnDataChanged();
 832
 833   if (IsEditableText()) {
 834     if (base::UTF8ToUTF16(value()) != new_value_) {
 835       old_value_ = new_value_;
 836       new_value_ = base::UTF8ToUTF16(value());
 837     }
 838   }
 839
 840   if (GetRole() == ui::AX_ROLE_ALERT && first_time_)
 841     manager()->NotifyAccessibilityEvent(ui::AX_EVENT_ALERT, this);
 842
 843   base::string16 live;
 844   if (GetString16Attribute(
 845       ui::AX_ATTR_CONTAINER_LIVE_STATUS, &live)) {
 846     NotifyLiveRegionUpdate(live);
 847   }
 848
 849   first_time_ = false;
 850 }
 851
 852 void BrowserAccessibilityAndroid::NotifyLiveRegionUpdate(
 853     base::string16& aria_live) {
 854   if (!EqualsASCII(aria_live, aria_strings::kAriaLivePolite) &&
 855       !EqualsASCII(aria_live, aria_strings::kAriaLiveAssertive))
 856     return;
 857
 858   base::string16 text = GetText();
 859   if (cached_text_ != text) {
 860     if (!text.empty()) {
 861       manager()->NotifyAccessibilityEvent(ui::AX_EVENT_SHOW,
 862                                          this);
 863     }
 864     cached_text_ = text;
 865   }
 866 }
 867
 868 int BrowserAccessibilityAndroid::CountChildrenWithRole(ui::AXRole role) const {
 869   int count = 0;
 870   for (uint32 i = 0; i < PlatformChildCount(); i++) {
 871     if (PlatformGetChild(i)->GetRole() == role)
 872       count++;
 873   }
 874   return count;
 875 }
 876
 877 }  // namespace content