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_FIELD;
 176 }
 177
 178 bool BrowserAccessibilityAndroid::IsEnabled() const {
 179   return HasState(ui::AX_STATE_ENABLED);
 180 }
 181
 182 bool BrowserAccessibilityAndroid::IsFocusable() const {
 183   bool focusable = HasState(ui::AX_STATE_FOCUSABLE);
 184   if (IsIframe() ||
 185       GetRole() == ui::AX_ROLE_WEB_AREA) {
 186     focusable = false;
 187   }
 188   return focusable;
 189 }
 190
 191 bool BrowserAccessibilityAndroid::IsFocused() const {
 192   return manager()->GetFocus(manager()->GetRoot()) == this;
 193 }
 194
 195 bool BrowserAccessibilityAndroid::IsHeading() const {
 196   BrowserAccessibilityAndroid* parent =
 197       static_cast<BrowserAccessibilityAndroid*>(GetParent());
 198   if (parent && parent->IsHeading())
 199     return true;
 200
 201   return (GetRole() == ui::AX_ROLE_COLUMN_HEADER ||
 202           GetRole() == ui::AX_ROLE_HEADING ||
 203           GetRole() == ui::AX_ROLE_ROW_HEADER);
 204 }
 205
 206 bool BrowserAccessibilityAndroid::IsHierarchical() const {
 207   return (GetRole() == ui::AX_ROLE_LIST ||
 208           GetRole() == ui::AX_ROLE_DESCRIPTION_LIST ||
 209           GetRole() == ui::AX_ROLE_TREE);
 210 }
 211
 212 bool BrowserAccessibilityAndroid::IsLink() const {
 213   return (GetRole() == ui::AX_ROLE_LINK ||
 214          GetRole() == ui::AX_ROLE_IMAGE_MAP_LINK);
 215 }
 216
 217 bool BrowserAccessibilityAndroid::IsMultiLine() const {
 218   return HasState(ui::AX_STATE_MULTILINE);
 219 }
 220
 221 bool BrowserAccessibilityAndroid::IsPassword() const {
 222   return HasState(ui::AX_STATE_PROTECTED);
 223 }
 224
 225 bool BrowserAccessibilityAndroid::IsRangeType() const {
 226   return (GetRole() == ui::AX_ROLE_PROGRESS_INDICATOR ||
 227           GetRole() == ui::AX_ROLE_METER ||
 228           GetRole() == ui::AX_ROLE_SCROLL_BAR ||
 229           GetRole() == ui::AX_ROLE_SLIDER);
 230 }
 231
 232 bool BrowserAccessibilityAndroid::IsScrollable() const {
 233   int dummy;
 234   return GetIntAttribute(ui::AX_ATTR_SCROLL_X_MAX, &dummy);
 235 }
 236
 237 bool BrowserAccessibilityAndroid::IsSelected() const {
 238   return HasState(ui::AX_STATE_SELECTED);
 239 }
 240
 241 bool BrowserAccessibilityAndroid::IsSlider() const {
 242   return GetRole() == ui::AX_ROLE_SLIDER;
 243 }
 244
 245 bool BrowserAccessibilityAndroid::IsVisibleToUser() const {
 246   return !HasState(ui::AX_STATE_INVISIBLE);
 247 }
 248
 249 bool BrowserAccessibilityAndroid::CanOpenPopup() const {
 250   return HasState(ui::AX_STATE_HASPOPUP);
 251 }
 252
 253 const char* BrowserAccessibilityAndroid::GetClassName() const {
 254   const char* class_name = NULL;
 255
 256   switch (GetRole()) {
 257     case ui::AX_ROLE_SEARCH_BOX:
 258     case ui::AX_ROLE_SPIN_BUTTON:
 259     case ui::AX_ROLE_TEXT_FIELD:
 260       class_name = "android.widget.EditText";
 261       break;
 262     case ui::AX_ROLE_SLIDER:
 263       class_name = "android.widget.SeekBar";
 264       break;
 265     case ui::AX_ROLE_COLOR_WELL:
 266     case ui::AX_ROLE_COMBO_BOX:
 267     case ui::AX_ROLE_DATE:
 268     case ui::AX_ROLE_POP_UP_BUTTON:
 269     case ui::AX_ROLE_TIME:
 270       class_name = "android.widget.Spinner";
 271       break;
 272     case ui::AX_ROLE_BUTTON:
 273     case ui::AX_ROLE_MENU_BUTTON:
 274       class_name = "android.widget.Button";
 275       break;
 276     case ui::AX_ROLE_CHECK_BOX:
 277     case ui::AX_ROLE_SWITCH:
 278       class_name = "android.widget.CheckBox";
 279       break;
 280     case ui::AX_ROLE_RADIO_BUTTON:
 281       class_name = "android.widget.RadioButton";
 282       break;
 283     case ui::AX_ROLE_TOGGLE_BUTTON:
 284       class_name = "android.widget.ToggleButton";
 285       break;
 286     case ui::AX_ROLE_CANVAS:
 287     case ui::AX_ROLE_IMAGE:
 288     case ui::AX_ROLE_SVG_ROOT:
 289       class_name = "android.widget.Image";
 290       break;
 291     case ui::AX_ROLE_METER:
 292     case ui::AX_ROLE_PROGRESS_INDICATOR:
 293       class_name = "android.widget.ProgressBar";
 294       break;
 295     case ui::AX_ROLE_TAB_LIST:
 296       class_name = "android.widget.TabWidget";
 297       break;
 298     case ui::AX_ROLE_GRID:
 299     case ui::AX_ROLE_TABLE:
 300       class_name = "android.widget.GridView";
 301       break;
 302     case ui::AX_ROLE_LIST:
 303     case ui::AX_ROLE_LIST_BOX:
 304     case ui::AX_ROLE_DESCRIPTION_LIST:
 305       class_name = "android.widget.ListView";
 306       break;
 307     case ui::AX_ROLE_DIALOG:
 308       class_name = "android.app.Dialog";
 309       break;
 310     case ui::AX_ROLE_ROOT_WEB_AREA:
 311       class_name = "android.webkit.WebView";
 312       break;
 313     case ui::AX_ROLE_MENU_ITEM:
 314     case ui::AX_ROLE_MENU_ITEM_CHECK_BOX:
 315     case ui::AX_ROLE_MENU_ITEM_RADIO:
 316       class_name = "android.view.MenuItem";
 317       break;
 318     default:
 319       class_name = "android.view.View";
 320       break;
 321   }
 322
 323   return class_name;
 324 }
 325
 326 base::string16 BrowserAccessibilityAndroid::GetText() const {
 327   if (IsIframe() ||
 328       GetRole() == ui::AX_ROLE_WEB_AREA) {
 329     return base::string16();
 330   }
 331
 332   // See comment in browser_accessibility_win.cc for details.
 333   // The difference here is that we can only expose one accessible
 334   // name on Android, not 2 or 3 like on Windows or Mac.
 335
 336   // First, always return the |value| attribute if this is an
 337   // input field.
 338   base::string16 value = GetString16Attribute(ui::AX_ATTR_VALUE);
 339   if (!value.empty()) {
 340     if (HasState(ui::AX_STATE_EDITABLE))
 341       return value;
 342
 343     switch (GetRole()) {
 344       case ui::AX_ROLE_COMBO_BOX:
 345       case ui::AX_ROLE_POP_UP_BUTTON:
 346       case ui::AX_ROLE_TEXT_FIELD:
 347         return value;
 348     }
 349   }
 350
 351   // For color wells, the color is stored in separate attributes.
 352   // Perhaps we could return color names in the future?
 353   if (GetRole() == ui::AX_ROLE_COLOR_WELL) {
 354     int red = GetIntAttribute(ui::AX_ATTR_COLOR_VALUE_RED);
 355     int green = GetIntAttribute(ui::AX_ATTR_COLOR_VALUE_GREEN);
 356     int blue = GetIntAttribute(ui::AX_ATTR_COLOR_VALUE_BLUE);
 357     return base::UTF8ToUTF16(
 358         base::StringPrintf("#%02X%02X%02X", red, green, blue));
 359   }
 360
 361   // Always prefer visible text if this is a link. Sites sometimes add
 362   // a "title" attribute to a link with more information, but we can't
 363   // lose the link text.
 364   base::string16 name = GetString16Attribute(ui::AX_ATTR_NAME);
 365   if (!name.empty() && GetRole() == ui::AX_ROLE_LINK)
 366     return name;
 367
 368   // If there's no text value, the basic rule is: prefer description
 369   // (aria-labelledby or aria-label), then help (title), then name
 370   // (inner text), then value (control value).  However, if
 371   // title_elem_id is set, that means there's a label element
 372   // supplying the name and then name takes precedence over help.
 373   // TODO(dmazzoni): clean this up by providing more granular labels in
 374   // Blink, making the platform-specific mapping to accessible text simpler.
 375   base::string16 description = GetString16Attribute(ui::AX_ATTR_DESCRIPTION);
 376   base::string16 help = GetString16Attribute(ui::AX_ATTR_HELP);
 377
 378   base::string16 placeholder;
 379   switch (GetRole()) {
 380     case ui::AX_ROLE_DATE:
 381     case ui::AX_ROLE_TEXT_FIELD:
 382     case ui::AX_ROLE_TIME:
 383       GetHtmlAttribute("placeholder", &placeholder);
 384   }
 385
 386   int title_elem_id = GetIntAttribute(
 387       ui::AX_ATTR_TITLE_UI_ELEMENT);
 388   base::string16 text;
 389   if (!description.empty())
 390     text = description;
 391   else if (title_elem_id && !name.empty())
 392     text = name;
 393   else if (!help.empty())
 394     text = help;
 395   else if (!name.empty())
 396     text = name;
 397   else if (!placeholder.empty())
 398     text = placeholder;
 399   else if (!value.empty())
 400     text = value;
 401   else if (title_elem_id) {
 402     BrowserAccessibility* title_elem =
 403           manager()->GetFromID(title_elem_id);
 404     if (title_elem)
 405       text = static_cast<BrowserAccessibilityAndroid*>(title_elem)->GetText();
 406   }
 407
 408   // This is called from PlatformIsLeaf, so don't call PlatformChildCount
 409   // from within this!
 410   if (text.empty() &&
 411       (HasOnlyStaticTextChildren() ||
 412        (IsFocusable() && HasOnlyTextAndImageChildren()))) {
 413     for (uint32 i = 0; i < InternalChildCount(); i++) {
 414       BrowserAccessibility* child = InternalGetChild(i);
 415       text += static_cast<BrowserAccessibilityAndroid*>(child)->GetText();
 416     }
 417   }
 418
 419   if (text.empty() && (IsLink() || GetRole() == ui::AX_ROLE_IMAGE)) {
 420     base::string16 url = GetString16Attribute(ui::AX_ATTR_URL);
 421     // Given a url like http://foo.com/bar/baz.png, just return the
 422     // base name, e.g., "baz".
 423     int trailing_slashes = 0;
 424     while (url.size() - trailing_slashes > 0 &&
 425            url[url.size() - trailing_slashes - 1] == '/') {
 426       trailing_slashes++;
 427     }
 428     if (trailing_slashes)
 429       url = url.substr(0, url.size() - trailing_slashes);
 430     size_t slash_index = url.rfind('/');
 431     if (slash_index != std::string::npos)
 432       url = url.substr(slash_index + 1);
 433     size_t dot_index = url.rfind('.');
 434     if (dot_index != std::string::npos)
 435       url = url.substr(0, dot_index);
 436     text = url;
 437   }
 438
 439   return text;
 440 }
 441
 442 int BrowserAccessibilityAndroid::GetItemIndex() const {
 443   int index = 0;
 444   switch (GetRole()) {
 445     case ui::AX_ROLE_LIST_ITEM:
 446     case ui::AX_ROLE_LIST_BOX_OPTION:
 447     case ui::AX_ROLE_TREE_ITEM:
 448       index = GetIndexInParent();
 449       break;
 450     case ui::AX_ROLE_SLIDER:
 451     case ui::AX_ROLE_PROGRESS_INDICATOR: {
 452       // Return a percentage here for live feedback in an AccessibilityEvent.
 453       // The exact value is returned in RangeCurrentValue.
 454       float min = GetFloatAttribute(ui::AX_ATTR_MIN_VALUE_FOR_RANGE);
 455       float max = GetFloatAttribute(ui::AX_ATTR_MAX_VALUE_FOR_RANGE);
 456       float value = GetFloatAttribute(ui::AX_ATTR_VALUE_FOR_RANGE);
 457       if (max > min && value >= min && value <= max)
 458         index = static_cast<int>(((value - min)) * 100 / (max - min));
 459       break;
 460     }
 461   }
 462   return index;
 463 }
 464
 465 int BrowserAccessibilityAndroid::GetItemCount() const {
 466   int count = 0;
 467   switch (GetRole()) {
 468     case ui::AX_ROLE_LIST:
 469     case ui::AX_ROLE_LIST_BOX:
 470     case ui::AX_ROLE_DESCRIPTION_LIST:
 471       count = PlatformChildCount();
 472       break;
 473     case ui::AX_ROLE_SLIDER:
 474     case ui::AX_ROLE_PROGRESS_INDICATOR:
 475       // An AccessibilityEvent can only return integer information about a
 476       // seek control, so we return a percentage. The real range is returned
 477       // in RangeMin and RangeMax.
 478       count = 100;
 479       break;
 480   }
 481   return count;
 482 }
 483
 484 int BrowserAccessibilityAndroid::GetScrollX() const {
 485   int value = 0;
 486   GetIntAttribute(ui::AX_ATTR_SCROLL_X, &value);
 487   return value;
 488 }
 489
 490 int BrowserAccessibilityAndroid::GetScrollY() const {
 491   int value = 0;
 492   GetIntAttribute(ui::AX_ATTR_SCROLL_Y, &value);
 493   return value;
 494 }
 495
 496 int BrowserAccessibilityAndroid::GetMaxScrollX() const {
 497   int value = 0;
 498   GetIntAttribute(ui::AX_ATTR_SCROLL_X_MAX, &value);
 499   return value;
 500 }
 501
 502 int BrowserAccessibilityAndroid::GetMaxScrollY() const {
 503   int value = 0;
 504   GetIntAttribute(ui::AX_ATTR_SCROLL_Y_MAX, &value);
 505   return value;
 506 }
 507
 508 int BrowserAccessibilityAndroid::GetTextChangeFromIndex() const {
 509   size_t index = 0;
 510   while (index < old_value_.length() &&
 511          index < new_value_.length() &&
 512          old_value_[index] == new_value_[index]) {
 513     index++;
 514   }
 515   return index;
 516 }
 517
 518 int BrowserAccessibilityAndroid::GetTextChangeAddedCount() const {
 519   size_t old_len = old_value_.length();
 520   size_t new_len = new_value_.length();
 521   size_t left = 0;
 522   while (left < old_len &&
 523          left < new_len &&
 524          old_value_[left] == new_value_[left]) {
 525     left++;
 526   }
 527   size_t right = 0;
 528   while (right < old_len &&
 529          right < new_len &&
 530          old_value_[old_len - right - 1] == new_value_[new_len - right - 1]) {
 531     right++;
 532   }
 533   return (new_len - left - right);
 534 }
 535
 536 int BrowserAccessibilityAndroid::GetTextChangeRemovedCount() const {
 537   size_t old_len = old_value_.length();
 538   size_t new_len = new_value_.length();
 539   size_t left = 0;
 540   while (left < old_len &&
 541          left < new_len &&
 542          old_value_[left] == new_value_[left]) {
 543     left++;
 544   }
 545   size_t right = 0;
 546   while (right < old_len &&
 547          right < new_len &&
 548          old_value_[old_len - right - 1] == new_value_[new_len - right - 1]) {
 549     right++;
 550   }
 551   return (old_len - left - right);
 552 }
 553
 554 base::string16 BrowserAccessibilityAndroid::GetTextChangeBeforeText() const {
 555   return old_value_;
 556 }
 557
 558 int BrowserAccessibilityAndroid::GetSelectionStart() const {
 559   int sel_start = 0;
 560   GetIntAttribute(ui::AX_ATTR_TEXT_SEL_START, &sel_start);
 561   return sel_start;
 562 }
 563
 564 int BrowserAccessibilityAndroid::GetSelectionEnd() const {
 565   int sel_end = 0;
 566   GetIntAttribute(ui::AX_ATTR_TEXT_SEL_END, &sel_end);
 567   return sel_end;
 568 }
 569
 570 int BrowserAccessibilityAndroid::GetEditableTextLength() const {
 571   base::string16 value = GetString16Attribute(ui::AX_ATTR_VALUE);
 572   return value.length();
 573 }
 574
 575 int BrowserAccessibilityAndroid::AndroidInputType() const {
 576   std::string html_tag = GetStringAttribute(
 577       ui::AX_ATTR_HTML_TAG);
 578   if (html_tag != "input")
 579     return ANDROID_TEXT_INPUTTYPE_TYPE_NULL;
 580
 581   std::string type;
 582   if (!GetHtmlAttribute("type", &type))
 583     return ANDROID_TEXT_INPUTTYPE_TYPE_TEXT;
 584
 585   if (type.empty() || type == "text" || type == "search")
 586     return ANDROID_TEXT_INPUTTYPE_TYPE_TEXT;
 587   else if (type == "date")
 588     return ANDROID_TEXT_INPUTTYPE_TYPE_DATETIME_DATE;
 589   else if (type == "datetime" || type == "datetime-local")
 590     return ANDROID_TEXT_INPUTTYPE_TYPE_DATETIME;
 591   else if (type == "email")
 592     return ANDROID_TEXT_INPUTTYPE_TYPE_TEXT_WEB_EMAIL;
 593   else if (type == "month")
 594     return ANDROID_TEXT_INPUTTYPE_TYPE_DATETIME_DATE;
 595   else if (type == "number")
 596     return ANDROID_TEXT_INPUTTYPE_TYPE_NUMBER;
 597   else if (type == "password")
 598     return ANDROID_TEXT_INPUTTYPE_TYPE_TEXT_WEB_PASSWORD;
 599   else if (type == "tel")
 600     return ANDROID_TEXT_INPUTTYPE_TYPE_PHONE;
 601   else if (type == "time")
 602     return ANDROID_TEXT_INPUTTYPE_TYPE_DATETIME_TIME;
 603   else if (type == "url")
 604     return ANDROID_TEXT_INPUTTYPE_TYPE_TEXT_URI;
 605   else if (type == "week")
 606     return ANDROID_TEXT_INPUTTYPE_TYPE_DATETIME;
 607
 608   return ANDROID_TEXT_INPUTTYPE_TYPE_NULL;
 609 }
 610
 611 int BrowserAccessibilityAndroid::AndroidLiveRegionType() const {
 612   std::string live = GetStringAttribute(
 613       ui::AX_ATTR_LIVE_STATUS);
 614   if (live == "polite")
 615     return ANDROID_VIEW_VIEW_ACCESSIBILITY_LIVE_REGION_POLITE;
 616   else if (live == "assertive")
 617     return ANDROID_VIEW_VIEW_ACCESSIBILITY_LIVE_REGION_ASSERTIVE;
 618   return ANDROID_VIEW_VIEW_ACCESSIBILITY_LIVE_REGION_NONE;
 619 }
 620
 621 int BrowserAccessibilityAndroid::AndroidRangeType() const {
 622   return ANDROID_VIEW_ACCESSIBILITY_RANGE_TYPE_FLOAT;
 623 }
 624
 625 int BrowserAccessibilityAndroid::RowCount() const {
 626   if (GetRole() == ui::AX_ROLE_GRID ||
 627       GetRole() == ui::AX_ROLE_TABLE) {
 628     return CountChildrenWithRole(ui::AX_ROLE_ROW);
 629   }
 630
 631   if (GetRole() == ui::AX_ROLE_LIST ||
 632       GetRole() == ui::AX_ROLE_LIST_BOX ||
 633       GetRole() == ui::AX_ROLE_DESCRIPTION_LIST ||
 634       GetRole() == ui::AX_ROLE_TREE) {
 635     return PlatformChildCount();
 636   }
 637
 638   return 0;
 639 }
 640
 641 int BrowserAccessibilityAndroid::ColumnCount() const {
 642   if (GetRole() == ui::AX_ROLE_GRID ||
 643       GetRole() == ui::AX_ROLE_TABLE) {
 644     return CountChildrenWithRole(ui::AX_ROLE_COLUMN);
 645   }
 646   return 0;
 647 }
 648
 649 int BrowserAccessibilityAndroid::RowIndex() const {
 650   if (GetRole() == ui::AX_ROLE_LIST_ITEM ||
 651       GetRole() == ui::AX_ROLE_LIST_BOX_OPTION ||
 652       GetRole() == ui::AX_ROLE_TREE_ITEM) {
 653     return GetIndexInParent();
 654   }
 655
 656   return GetIntAttribute(ui::AX_ATTR_TABLE_CELL_ROW_INDEX);
 657 }
 658
 659 int BrowserAccessibilityAndroid::RowSpan() const {
 660   return GetIntAttribute(ui::AX_ATTR_TABLE_CELL_ROW_SPAN);
 661 }
 662
 663 int BrowserAccessibilityAndroid::ColumnIndex() const {
 664   return GetIntAttribute(ui::AX_ATTR_TABLE_CELL_COLUMN_INDEX);
 665 }
 666
 667 int BrowserAccessibilityAndroid::ColumnSpan() const {
 668   return GetIntAttribute(ui::AX_ATTR_TABLE_CELL_COLUMN_SPAN);
 669 }
 670
 671 float BrowserAccessibilityAndroid::RangeMin() const {
 672   return GetFloatAttribute(ui::AX_ATTR_MIN_VALUE_FOR_RANGE);
 673 }
 674
 675 float BrowserAccessibilityAndroid::RangeMax() const {
 676   return GetFloatAttribute(ui::AX_ATTR_MAX_VALUE_FOR_RANGE);
 677 }
 678
 679 float BrowserAccessibilityAndroid::RangeCurrentValue() const {
 680   return GetFloatAttribute(ui::AX_ATTR_VALUE_FOR_RANGE);
 681 }
 682
 683 void BrowserAccessibilityAndroid::GetGranularityBoundaries(
 684     int granularity,
 685     std::vector<int32>* starts,
 686     std::vector<int32>* ends,
 687     int offset) {
 688   switch (granularity) {
 689     case ANDROID_ACCESSIBILITY_NODE_INFO_MOVEMENT_GRANULARITY_LINE:
 690       GetLineBoundaries(starts, ends, offset);
 691       break;
 692     case ANDROID_ACCESSIBILITY_NODE_INFO_MOVEMENT_GRANULARITY_WORD:
 693       GetWordBoundaries(starts, ends, offset);
 694       break;
 695     default:
 696       NOTREACHED();
 697   }
 698 }
 699
 700 void BrowserAccessibilityAndroid::GetLineBoundaries(
 701     std::vector<int32>* line_starts,
 702     std::vector<int32>* line_ends,
 703     int offset) {
 704   // If this node has no children, treat it as all one line.
 705   if (GetText().size() > 0 && !InternalChildCount()) {
 706     line_starts->push_back(offset);
 707     line_ends->push_back(offset + GetText().size());
 708   }
 709
 710   // If this is a static text node, get the line boundaries from the
 711   // inline text boxes if possible.
 712   if (GetRole() == ui::AX_ROLE_STATIC_TEXT) {
 713     int last_y = 0;
 714     for (uint32 i = 0; i < InternalChildCount(); i++) {
 715       BrowserAccessibilityAndroid* child =
 716           static_cast<BrowserAccessibilityAndroid*>(InternalGetChild(i));
 717       CHECK_EQ(ui::AX_ROLE_INLINE_TEXT_BOX, child->GetRole());
 718       // TODO(dmazzoni): replace this with a proper API to determine
 719       // if two inline text boxes are on the same line. http://crbug.com/421771
 720       int y = child->GetLocation().y();
 721       if (i == 0) {
 722         line_starts->push_back(offset);
 723       } else if (y != last_y) {
 724         line_ends->push_back(offset);
 725         line_starts->push_back(offset);
 726       }
 727       offset += child->GetText().size();
 728       last_y = y;
 729     }
 730     line_ends->push_back(offset);
 731     return;
 732   }
 733
 734   // Otherwise, call GetLineBoundaries recursively on the children.
 735   for (uint32 i = 0; i < InternalChildCount(); i++) {
 736     BrowserAccessibilityAndroid* child =
 737         static_cast<BrowserAccessibilityAndroid*>(InternalGetChild(i));
 738     child->GetLineBoundaries(line_starts, line_ends, offset);
 739     offset += child->GetText().size();
 740   }
 741 }
 742
 743 void BrowserAccessibilityAndroid::GetWordBoundaries(
 744     std::vector<int32>* word_starts,
 745     std::vector<int32>* word_ends,
 746     int offset) {
 747   if (GetRole() == ui::AX_ROLE_INLINE_TEXT_BOX) {
 748     const std::vector<int32>& starts = GetIntListAttribute(
 749         ui::AX_ATTR_WORD_STARTS);
 750     const std::vector<int32>& ends = GetIntListAttribute(
 751         ui::AX_ATTR_WORD_ENDS);
 752     for (size_t i = 0; i < starts.size(); ++i) {
 753       word_starts->push_back(offset + starts[i]);
 754       word_ends->push_back(offset + ends[i]);
 755     }
 756     return;
 757   }
 758
 759   base::string16 concatenated_text;
 760   for (uint32 i = 0; i < InternalChildCount(); i++) {
 761     BrowserAccessibilityAndroid* child =
 762         static_cast<BrowserAccessibilityAndroid*>(InternalGetChild(i));
 763     base::string16 child_text = child->GetText();
 764     concatenated_text += child->GetText();
 765   }
 766
 767   base::string16 text = GetText();
 768   if (text.empty() || concatenated_text == text) {
 769     // Great - this node is just the concatenation of its children, so
 770     // we can get the word boundaries recursively.
 771     for (uint32 i = 0; i < InternalChildCount(); i++) {
 772       BrowserAccessibilityAndroid* child =
 773           static_cast<BrowserAccessibilityAndroid*>(InternalGetChild(i));
 774       child->GetWordBoundaries(word_starts, word_ends, offset);
 775       offset += child->GetText().size();
 776     }
 777   } else {
 778     // This node has its own accessible text that doesn't match its
 779     // visible text - like alt text for an image or something with an
 780     // aria-label, so split the text into words locally.
 781     base::i18n::BreakIterator iter(text, base::i18n::BreakIterator::BREAK_WORD);
 782     if (!iter.Init())
 783       return;
 784     while (iter.Advance()) {
 785       if (iter.IsWord()) {
 786         word_starts->push_back(iter.prev());
 787         word_ends->push_back(iter.pos());
 788       }
 789     }
 790   }
 791 }
 792
 793 bool BrowserAccessibilityAndroid::HasFocusableChild() const {
 794   // This is called from PlatformIsLeaf, so don't call PlatformChildCount
 795   // from within this!
 796   for (uint32 i = 0; i < InternalChildCount(); i++) {
 797     BrowserAccessibility* child = InternalGetChild(i);
 798     if (child->HasState(ui::AX_STATE_FOCUSABLE))
 799       return true;
 800     if (static_cast<BrowserAccessibilityAndroid*>(child)->HasFocusableChild())
 801       return true;
 802   }
 803   return false;
 804 }
 805
 806 bool BrowserAccessibilityAndroid::HasOnlyStaticTextChildren() const {
 807   // This is called from PlatformIsLeaf, so don't call PlatformChildCount
 808   // from within this!
 809   for (uint32 i = 0; i < InternalChildCount(); i++) {
 810     BrowserAccessibility* child = InternalGetChild(i);
 811     if (child->GetRole() != ui::AX_ROLE_STATIC_TEXT)
 812       return false;
 813   }
 814   return true;
 815 }
 816
 817 bool BrowserAccessibilityAndroid::HasOnlyTextAndImageChildren() const {
 818   // This is called from PlatformIsLeaf, so don't call PlatformChildCount
 819   // from within this!
 820   for (uint32 i = 0; i < InternalChildCount(); i++) {
 821     BrowserAccessibility* child = InternalGetChild(i);
 822     if (child->GetRole() != ui::AX_ROLE_STATIC_TEXT &&
 823         child->GetRole() != ui::AX_ROLE_IMAGE) {
 824       return false;
 825     }
 826   }
 827   return true;
 828 }
 829
 830 bool BrowserAccessibilityAndroid::IsIframe() const {
 831   base::string16 html_tag = GetString16Attribute(
 832       ui::AX_ATTR_HTML_TAG);
 833   return html_tag == base::ASCIIToUTF16("iframe");
 834 }
 835
 836 void BrowserAccessibilityAndroid::OnDataChanged() {
 837   BrowserAccessibility::OnDataChanged();
 838
 839   if (IsEditableText()) {
 840     base::string16 value = GetString16Attribute(ui::AX_ATTR_VALUE);
 841     if (value != new_value_) {
 842       old_value_ = new_value_;
 843       new_value_ = value;
 844     }
 845   }
 846
 847   if (GetRole() == ui::AX_ROLE_ALERT && first_time_)
 848     manager()->NotifyAccessibilityEvent(ui::AX_EVENT_ALERT, this);
 849
 850   base::string16 live;
 851   if (GetString16Attribute(
 852       ui::AX_ATTR_CONTAINER_LIVE_STATUS, &live)) {
 853     NotifyLiveRegionUpdate(live);
 854   }
 855
 856   first_time_ = false;
 857 }
 858
 859 void BrowserAccessibilityAndroid::NotifyLiveRegionUpdate(
 860     base::string16& aria_live) {
 861   if (!EqualsASCII(aria_live, aria_strings::kAriaLivePolite) &&
 862       !EqualsASCII(aria_live, aria_strings::kAriaLiveAssertive))
 863     return;
 864
 865   base::string16 text = GetText();
 866   if (cached_text_ != text) {
 867     if (!text.empty()) {
 868       manager()->NotifyAccessibilityEvent(ui::AX_EVENT_SHOW,
 869                                          this);
 870     }
 871     cached_text_ = text;
 872   }
 873 }
 874
 875 int BrowserAccessibilityAndroid::CountChildrenWithRole(ui::AXRole role) const {
 876   int count = 0;
 877   for (uint32 i = 0; i < PlatformChildCount(); i++) {
 878     if (PlatformGetChild(i)->GetRole() == role)
 879       count++;
 880   }
 881   return count;
 882 }
 883
 884 }  // namespace content