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   BrowserAccessibilityAndroid* parent =
 198       static_cast<BrowserAccessibilityAndroid*>(GetParent());
 199   if (parent && parent->IsHeading())
 200     return true;
 201
 202   return (GetRole() == ui::AX_ROLE_COLUMN_HEADER ||
 203           GetRole() == ui::AX_ROLE_HEADING ||
 204           GetRole() == ui::AX_ROLE_ROW_HEADER);
 205 }
 206
 207 bool BrowserAccessibilityAndroid::IsHierarchical() const {
 208   return (GetRole() == ui::AX_ROLE_LIST ||
 209           GetRole() == ui::AX_ROLE_DESCRIPTION_LIST ||
 210           GetRole() == ui::AX_ROLE_TREE);
 211 }
 212
 213 bool BrowserAccessibilityAndroid::IsLink() const {
 214   return (GetRole() == ui::AX_ROLE_LINK ||
 215          GetRole() == ui::AX_ROLE_IMAGE_MAP_LINK);
 216 }
 217
 218 bool BrowserAccessibilityAndroid::IsMultiLine() const {
 219   return GetRole() == ui::AX_ROLE_TEXT_AREA;
 220 }
 221
 222 bool BrowserAccessibilityAndroid::IsPassword() const {
 223   return HasState(ui::AX_STATE_PROTECTED);
 224 }
 225
 226 bool BrowserAccessibilityAndroid::IsRangeType() const {
 227   return (GetRole() == ui::AX_ROLE_PROGRESS_INDICATOR ||
 228           GetRole() == ui::AX_ROLE_METER ||
 229           GetRole() == ui::AX_ROLE_SCROLL_BAR ||
 230           GetRole() == ui::AX_ROLE_SLIDER);
 231 }
 232
 233 bool BrowserAccessibilityAndroid::IsScrollable() const {
 234   int dummy;
 235   return GetIntAttribute(ui::AX_ATTR_SCROLL_X_MAX, &dummy);
 236 }
 237
 238 bool BrowserAccessibilityAndroid::IsSelected() const {
 239   return HasState(ui::AX_STATE_SELECTED);
 240 }
 241
 242 bool BrowserAccessibilityAndroid::IsSlider() const {
 243   return GetRole() == ui::AX_ROLE_SLIDER;
 244 }
 245
 246 bool BrowserAccessibilityAndroid::IsVisibleToUser() const {
 247   return !HasState(ui::AX_STATE_INVISIBLE);
 248 }
 249
 250 bool BrowserAccessibilityAndroid::CanOpenPopup() const {
 251   return HasState(ui::AX_STATE_HASPOPUP);
 252 }
 253
 254 const char* BrowserAccessibilityAndroid::GetClassName() const {
 255   const char* class_name = NULL;
 256
 257   switch (GetRole()) {
 258     case ui::AX_ROLE_SPIN_BUTTON:
 259     case ui::AX_ROLE_TEXT_AREA:
 260     case ui::AX_ROLE_TEXT_FIELD:
 261       class_name = "android.widget.EditText";
 262       break;
 263     case ui::AX_ROLE_SLIDER:
 264       class_name = "android.widget.SeekBar";
 265       break;
 266     case ui::AX_ROLE_COLOR_WELL:
 267     case ui::AX_ROLE_COMBO_BOX:
 268     case ui::AX_ROLE_DATE:
 269     case ui::AX_ROLE_POP_UP_BUTTON:
 270     case ui::AX_ROLE_TIME:
 271       class_name = "android.widget.Spinner";
 272       break;
 273     case ui::AX_ROLE_BUTTON:
 274     case ui::AX_ROLE_MENU_BUTTON:
 275       class_name = "android.widget.Button";
 276       break;
 277     case ui::AX_ROLE_CHECK_BOX:
 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_AREA:
 347       case ui::AX_ROLE_TEXT_FIELD:
 348         return value;
 349     }
 350   }
 351
 352   // For color wells, the color is stored in separate attributes.
 353   // Perhaps we could return color names in the future?
 354   if (GetRole() == ui::AX_ROLE_COLOR_WELL) {
 355     int red = GetIntAttribute(ui::AX_ATTR_COLOR_VALUE_RED);
 356     int green = GetIntAttribute(ui::AX_ATTR_COLOR_VALUE_GREEN);
 357     int blue = GetIntAttribute(ui::AX_ATTR_COLOR_VALUE_BLUE);
 358     return base::UTF8ToUTF16(
 359         base::StringPrintf("#%02X%02X%02X", red, green, blue));
 360   }
 361
 362   // Always prefer visible text if this is a link. Sites sometimes add
 363   // a "title" attribute to a link with more information, but we can't
 364   // lose the link text.
 365   base::string16 name = GetString16Attribute(ui::AX_ATTR_NAME);
 366   if (!name.empty() && GetRole() == ui::AX_ROLE_LINK)
 367     return name;
 368
 369   // If there's no text value, the basic rule is: prefer description
 370   // (aria-labelledby or aria-label), then help (title), then name
 371   // (inner text), then value (control value).  However, if
 372   // title_elem_id is set, that means there's a label element
 373   // supplying the name and then name takes precedence over help.
 374   // TODO(dmazzoni): clean this up by providing more granular labels in
 375   // Blink, making the platform-specific mapping to accessible text simpler.
 376   base::string16 description = GetString16Attribute(ui::AX_ATTR_DESCRIPTION);
 377   base::string16 help = GetString16Attribute(ui::AX_ATTR_HELP);
 378
 379   base::string16 placeholder;
 380   switch (GetRole()) {
 381     case ui::AX_ROLE_DATE:
 382     case ui::AX_ROLE_TEXT_AREA:
 383     case ui::AX_ROLE_TEXT_FIELD:
 384     case ui::AX_ROLE_TIME:
 385       GetHtmlAttribute("placeholder", &placeholder);
 386   }
 387
 388   int title_elem_id = GetIntAttribute(
 389       ui::AX_ATTR_TITLE_UI_ELEMENT);
 390   base::string16 text;
 391   if (!description.empty())
 392     text = description;
 393   else if (title_elem_id && !name.empty())
 394     text = name;
 395   else if (!help.empty())
 396     text = help;
 397   else if (!name.empty())
 398     text = name;
 399   else if (!placeholder.empty())
 400     text = placeholder;
 401   else if (!value.empty())
 402     text = value;
 403   else if (title_elem_id) {
 404     BrowserAccessibility* title_elem =
 405           manager()->GetFromID(title_elem_id);
 406     if (title_elem)
 407       text = static_cast<BrowserAccessibilityAndroid*>(title_elem)->GetText();
 408   }
 409
 410   // This is called from PlatformIsLeaf, so don't call PlatformChildCount
 411   // from within this!
 412   if (text.empty() &&
 413       (HasOnlyStaticTextChildren() ||
 414        (IsFocusable() && HasOnlyTextAndImageChildren()))) {
 415     for (uint32 i = 0; i < InternalChildCount(); i++) {
 416       BrowserAccessibility* child = InternalGetChild(i);
 417       text += static_cast<BrowserAccessibilityAndroid*>(child)->GetText();
 418     }
 419   }
 420
 421   if (text.empty() && (IsLink() || GetRole() == ui::AX_ROLE_IMAGE)) {
 422     base::string16 url = GetString16Attribute(ui::AX_ATTR_URL);
 423     // Given a url like http://foo.com/bar/baz.png, just return the
 424     // base name, e.g., "baz".
 425     int trailing_slashes = 0;
 426     while (url.size() - trailing_slashes > 0 &&
 427            url[url.size() - trailing_slashes - 1] == '/') {
 428       trailing_slashes++;
 429     }
 430     if (trailing_slashes)
 431       url = url.substr(0, url.size() - trailing_slashes);
 432     size_t slash_index = url.rfind('/');
 433     if (slash_index != std::string::npos)
 434       url = url.substr(slash_index + 1);
 435     size_t dot_index = url.rfind('.');
 436     if (dot_index != std::string::npos)
 437       url = url.substr(0, dot_index);
 438     text = url;
 439   }
 440
 441   return text;
 442 }
 443
 444 int BrowserAccessibilityAndroid::GetItemIndex() const {
 445   int index = 0;
 446   switch (GetRole()) {
 447     case ui::AX_ROLE_LIST_ITEM:
 448     case ui::AX_ROLE_LIST_BOX_OPTION:
 449     case ui::AX_ROLE_TREE_ITEM:
 450       index = GetIndexInParent();
 451       break;
 452     case ui::AX_ROLE_SLIDER:
 453     case ui::AX_ROLE_PROGRESS_INDICATOR: {
 454       // Return a percentage here for live feedback in an AccessibilityEvent.
 455       // The exact value is returned in RangeCurrentValue.
 456       float min = GetFloatAttribute(ui::AX_ATTR_MIN_VALUE_FOR_RANGE);
 457       float max = GetFloatAttribute(ui::AX_ATTR_MAX_VALUE_FOR_RANGE);
 458       float value = GetFloatAttribute(ui::AX_ATTR_VALUE_FOR_RANGE);
 459       if (max > min && value >= min && value <= max)
 460         index = static_cast<int>(((value - min)) * 100 / (max - min));
 461       break;
 462     }
 463   }
 464   return index;
 465 }
 466
 467 int BrowserAccessibilityAndroid::GetItemCount() const {
 468   int count = 0;
 469   switch (GetRole()) {
 470     case ui::AX_ROLE_LIST:
 471     case ui::AX_ROLE_LIST_BOX:
 472     case ui::AX_ROLE_DESCRIPTION_LIST:
 473       count = PlatformChildCount();
 474       break;
 475     case ui::AX_ROLE_SLIDER:
 476     case ui::AX_ROLE_PROGRESS_INDICATOR:
 477       // An AccessibilityEvent can only return integer information about a
 478       // seek control, so we return a percentage. The real range is returned
 479       // in RangeMin and RangeMax.
 480       count = 100;
 481       break;
 482   }
 483   return count;
 484 }
 485
 486 int BrowserAccessibilityAndroid::GetScrollX() const {
 487   int value = 0;
 488   GetIntAttribute(ui::AX_ATTR_SCROLL_X, &value);
 489   return value;
 490 }
 491
 492 int BrowserAccessibilityAndroid::GetScrollY() const {
 493   int value = 0;
 494   GetIntAttribute(ui::AX_ATTR_SCROLL_Y, &value);
 495   return value;
 496 }
 497
 498 int BrowserAccessibilityAndroid::GetMaxScrollX() const {
 499   int value = 0;
 500   GetIntAttribute(ui::AX_ATTR_SCROLL_X_MAX, &value);
 501   return value;
 502 }
 503
 504 int BrowserAccessibilityAndroid::GetMaxScrollY() const {
 505   int value = 0;
 506   GetIntAttribute(ui::AX_ATTR_SCROLL_Y_MAX, &value);
 507   return value;
 508 }
 509
 510 int BrowserAccessibilityAndroid::GetTextChangeFromIndex() const {
 511   size_t index = 0;
 512   while (index < old_value_.length() &&
 513          index < new_value_.length() &&
 514          old_value_[index] == new_value_[index]) {
 515     index++;
 516   }
 517   return index;
 518 }
 519
 520 int BrowserAccessibilityAndroid::GetTextChangeAddedCount() const {
 521   size_t old_len = old_value_.length();
 522   size_t new_len = new_value_.length();
 523   size_t left = 0;
 524   while (left < old_len &&
 525          left < new_len &&
 526          old_value_[left] == new_value_[left]) {
 527     left++;
 528   }
 529   size_t right = 0;
 530   while (right < old_len &&
 531          right < new_len &&
 532          old_value_[old_len - right - 1] == new_value_[new_len - right - 1]) {
 533     right++;
 534   }
 535   return (new_len - left - right);
 536 }
 537
 538 int BrowserAccessibilityAndroid::GetTextChangeRemovedCount() const {
 539   size_t old_len = old_value_.length();
 540   size_t new_len = new_value_.length();
 541   size_t left = 0;
 542   while (left < old_len &&
 543          left < new_len &&
 544          old_value_[left] == new_value_[left]) {
 545     left++;
 546   }
 547   size_t right = 0;
 548   while (right < old_len &&
 549          right < new_len &&
 550          old_value_[old_len - right - 1] == new_value_[new_len - right - 1]) {
 551     right++;
 552   }
 553   return (old_len - left - right);
 554 }
 555
 556 base::string16 BrowserAccessibilityAndroid::GetTextChangeBeforeText() const {
 557   return old_value_;
 558 }
 559
 560 int BrowserAccessibilityAndroid::GetSelectionStart() const {
 561   int sel_start = 0;
 562   GetIntAttribute(ui::AX_ATTR_TEXT_SEL_START, &sel_start);
 563   return sel_start;
 564 }
 565
 566 int BrowserAccessibilityAndroid::GetSelectionEnd() const {
 567   int sel_end = 0;
 568   GetIntAttribute(ui::AX_ATTR_TEXT_SEL_END, &sel_end);
 569   return sel_end;
 570 }
 571
 572 int BrowserAccessibilityAndroid::GetEditableTextLength() const {
 573   base::string16 value = GetString16Attribute(ui::AX_ATTR_VALUE);
 574   return value.length();
 575 }
 576
 577 int BrowserAccessibilityAndroid::AndroidInputType() const {
 578   std::string html_tag = GetStringAttribute(
 579       ui::AX_ATTR_HTML_TAG);
 580   if (html_tag != "input")
 581     return ANDROID_TEXT_INPUTTYPE_TYPE_NULL;
 582
 583   std::string type;
 584   if (!GetHtmlAttribute("type", &type))
 585     return ANDROID_TEXT_INPUTTYPE_TYPE_TEXT;
 586
 587   if (type.empty() || type == "text" || type == "search")
 588     return ANDROID_TEXT_INPUTTYPE_TYPE_TEXT;
 589   else if (type == "date")
 590     return ANDROID_TEXT_INPUTTYPE_TYPE_DATETIME_DATE;
 591   else if (type == "datetime" || type == "datetime-local")
 592     return ANDROID_TEXT_INPUTTYPE_TYPE_DATETIME;
 593   else if (type == "email")
 594     return ANDROID_TEXT_INPUTTYPE_TYPE_TEXT_WEB_EMAIL;
 595   else if (type == "month")
 596     return ANDROID_TEXT_INPUTTYPE_TYPE_DATETIME_DATE;
 597   else if (type == "number")
 598     return ANDROID_TEXT_INPUTTYPE_TYPE_NUMBER;
 599   else if (type == "password")
 600     return ANDROID_TEXT_INPUTTYPE_TYPE_TEXT_WEB_PASSWORD;
 601   else if (type == "tel")
 602     return ANDROID_TEXT_INPUTTYPE_TYPE_PHONE;
 603   else if (type == "time")
 604     return ANDROID_TEXT_INPUTTYPE_TYPE_DATETIME_TIME;
 605   else if (type == "url")
 606     return ANDROID_TEXT_INPUTTYPE_TYPE_TEXT_URI;
 607   else if (type == "week")
 608     return ANDROID_TEXT_INPUTTYPE_TYPE_DATETIME;
 609
 610   return ANDROID_TEXT_INPUTTYPE_TYPE_NULL;
 611 }
 612
 613 int BrowserAccessibilityAndroid::AndroidLiveRegionType() const {
 614   std::string live = GetStringAttribute(
 615       ui::AX_ATTR_LIVE_STATUS);
 616   if (live == "polite")
 617     return ANDROID_VIEW_VIEW_ACCESSIBILITY_LIVE_REGION_POLITE;
 618   else if (live == "assertive")
 619     return ANDROID_VIEW_VIEW_ACCESSIBILITY_LIVE_REGION_ASSERTIVE;
 620   return ANDROID_VIEW_VIEW_ACCESSIBILITY_LIVE_REGION_NONE;
 621 }
 622
 623 int BrowserAccessibilityAndroid::AndroidRangeType() const {
 624   return ANDROID_VIEW_ACCESSIBILITY_RANGE_TYPE_FLOAT;
 625 }
 626
 627 int BrowserAccessibilityAndroid::RowCount() const {
 628   if (GetRole() == ui::AX_ROLE_GRID ||
 629       GetRole() == ui::AX_ROLE_TABLE) {
 630     return CountChildrenWithRole(ui::AX_ROLE_ROW);
 631   }
 632
 633   if (GetRole() == ui::AX_ROLE_LIST ||
 634       GetRole() == ui::AX_ROLE_LIST_BOX ||
 635       GetRole() == ui::AX_ROLE_DESCRIPTION_LIST ||
 636       GetRole() == ui::AX_ROLE_TREE) {
 637     return PlatformChildCount();
 638   }
 639
 640   return 0;
 641 }
 642
 643 int BrowserAccessibilityAndroid::ColumnCount() const {
 644   if (GetRole() == ui::AX_ROLE_GRID ||
 645       GetRole() == ui::AX_ROLE_TABLE) {
 646     return CountChildrenWithRole(ui::AX_ROLE_COLUMN);
 647   }
 648   return 0;
 649 }
 650
 651 int BrowserAccessibilityAndroid::RowIndex() const {
 652   if (GetRole() == ui::AX_ROLE_LIST_ITEM ||
 653       GetRole() == ui::AX_ROLE_LIST_BOX_OPTION ||
 654       GetRole() == ui::AX_ROLE_TREE_ITEM) {
 655     return GetIndexInParent();
 656   }
 657
 658   return GetIntAttribute(ui::AX_ATTR_TABLE_CELL_ROW_INDEX);
 659 }
 660
 661 int BrowserAccessibilityAndroid::RowSpan() const {
 662   return GetIntAttribute(ui::AX_ATTR_TABLE_CELL_ROW_SPAN);
 663 }
 664
 665 int BrowserAccessibilityAndroid::ColumnIndex() const {
 666   return GetIntAttribute(ui::AX_ATTR_TABLE_CELL_COLUMN_INDEX);
 667 }
 668
 669 int BrowserAccessibilityAndroid::ColumnSpan() const {
 670   return GetIntAttribute(ui::AX_ATTR_TABLE_CELL_COLUMN_SPAN);
 671 }
 672
 673 float BrowserAccessibilityAndroid::RangeMin() const {
 674   return GetFloatAttribute(ui::AX_ATTR_MIN_VALUE_FOR_RANGE);
 675 }
 676
 677 float BrowserAccessibilityAndroid::RangeMax() const {
 678   return GetFloatAttribute(ui::AX_ATTR_MAX_VALUE_FOR_RANGE);
 679 }
 680
 681 float BrowserAccessibilityAndroid::RangeCurrentValue() const {
 682   return GetFloatAttribute(ui::AX_ATTR_VALUE_FOR_RANGE);
 683 }
 684
 685 void BrowserAccessibilityAndroid::GetGranularityBoundaries(
 686     int granularity,
 687     std::vector<int32>* starts,
 688     std::vector<int32>* ends,
 689     int offset) {
 690   switch (granularity) {
 691     case ANDROID_ACCESSIBILITY_NODE_INFO_MOVEMENT_GRANULARITY_LINE:
 692       GetLineBoundaries(starts, ends, offset);
 693       break;
 694     case ANDROID_ACCESSIBILITY_NODE_INFO_MOVEMENT_GRANULARITY_WORD:
 695       GetWordBoundaries(starts, ends, offset);
 696       break;
 697     default:
 698       NOTREACHED();
 699   }
 700 }
 701
 702 void BrowserAccessibilityAndroid::GetLineBoundaries(
 703     std::vector<int32>* line_starts,
 704     std::vector<int32>* line_ends,
 705     int offset) {
 706   // If this node has no children, treat it as all one line.
 707   if (GetText().size() > 0 && !InternalChildCount()) {
 708     line_starts->push_back(offset);
 709     line_ends->push_back(offset + GetText().size());
 710   }
 711
 712   // If this is a static text node, get the line boundaries from the
 713   // inline text boxes if possible.
 714   if (GetRole() == ui::AX_ROLE_STATIC_TEXT) {
 715     int last_y = 0;
 716     for (uint32 i = 0; i < InternalChildCount(); i++) {
 717       BrowserAccessibilityAndroid* child =
 718           static_cast<BrowserAccessibilityAndroid*>(InternalGetChild(i));
 719       CHECK_EQ(ui::AX_ROLE_INLINE_TEXT_BOX, child->GetRole());
 720       // TODO(dmazzoni): replace this with a proper API to determine
 721       // if two inline text boxes are on the same line. http://crbug.com/421771
 722       int y = child->GetLocation().y();
 723       if (i == 0) {
 724         line_starts->push_back(offset);
 725       } else if (y != last_y) {
 726         line_ends->push_back(offset);
 727         line_starts->push_back(offset);
 728       }
 729       offset += child->GetText().size();
 730       last_y = y;
 731     }
 732     line_ends->push_back(offset);
 733     return;
 734   }
 735
 736   // Otherwise, call GetLineBoundaries recursively on the children.
 737   for (uint32 i = 0; i < InternalChildCount(); i++) {
 738     BrowserAccessibilityAndroid* child =
 739         static_cast<BrowserAccessibilityAndroid*>(InternalGetChild(i));
 740     child->GetLineBoundaries(line_starts, line_ends, offset);
 741     offset += child->GetText().size();
 742   }
 743 }
 744
 745 void BrowserAccessibilityAndroid::GetWordBoundaries(
 746     std::vector<int32>* word_starts,
 747     std::vector<int32>* word_ends,
 748     int offset) {
 749   if (GetRole() == ui::AX_ROLE_INLINE_TEXT_BOX) {
 750     const std::vector<int32>& starts = GetIntListAttribute(
 751         ui::AX_ATTR_WORD_STARTS);
 752     const std::vector<int32>& ends = GetIntListAttribute(
 753         ui::AX_ATTR_WORD_ENDS);
 754     for (size_t i = 0; i < starts.size(); ++i) {
 755       word_starts->push_back(offset + starts[i]);
 756       word_ends->push_back(offset + ends[i]);
 757     }
 758     return;
 759   }
 760
 761   base::string16 concatenated_text;
 762   for (uint32 i = 0; i < InternalChildCount(); i++) {
 763     BrowserAccessibilityAndroid* child =
 764         static_cast<BrowserAccessibilityAndroid*>(InternalGetChild(i));
 765     base::string16 child_text = child->GetText();
 766     concatenated_text += child->GetText();
 767   }
 768
 769   base::string16 text = GetText();
 770   if (text.empty() || concatenated_text == text) {
 771     // Great - this node is just the concatenation of its children, so
 772     // we can get the word boundaries recursively.
 773     for (uint32 i = 0; i < InternalChildCount(); i++) {
 774       BrowserAccessibilityAndroid* child =
 775           static_cast<BrowserAccessibilityAndroid*>(InternalGetChild(i));
 776       child->GetWordBoundaries(word_starts, word_ends, offset);
 777       offset += child->GetText().size();
 778     }
 779   } else {
 780     // This node has its own accessible text that doesn't match its
 781     // visible text - like alt text for an image or something with an
 782     // aria-label, so split the text into words locally.
 783     base::i18n::BreakIterator iter(text, base::i18n::BreakIterator::BREAK_WORD);
 784     if (!iter.Init())
 785       return;
 786     while (iter.Advance()) {
 787       if (iter.IsWord()) {
 788         word_starts->push_back(iter.prev());
 789         word_ends->push_back(iter.pos());
 790       }
 791     }
 792   }
 793 }
 794
 795 bool BrowserAccessibilityAndroid::HasFocusableChild() const {
 796   // This is called from PlatformIsLeaf, so don't call PlatformChildCount
 797   // from within this!
 798   for (uint32 i = 0; i < InternalChildCount(); i++) {
 799     BrowserAccessibility* child = InternalGetChild(i);
 800     if (child->HasState(ui::AX_STATE_FOCUSABLE))
 801       return true;
 802     if (static_cast<BrowserAccessibilityAndroid*>(child)->HasFocusableChild())
 803       return true;
 804   }
 805   return false;
 806 }
 807
 808 bool BrowserAccessibilityAndroid::HasOnlyStaticTextChildren() const {
 809   // This is called from PlatformIsLeaf, so don't call PlatformChildCount
 810   // from within this!
 811   for (uint32 i = 0; i < InternalChildCount(); i++) {
 812     BrowserAccessibility* child = InternalGetChild(i);
 813     if (child->GetRole() != ui::AX_ROLE_STATIC_TEXT)
 814       return false;
 815   }
 816   return true;
 817 }
 818
 819 bool BrowserAccessibilityAndroid::HasOnlyTextAndImageChildren() const {
 820   // This is called from PlatformIsLeaf, so don't call PlatformChildCount
 821   // from within this!
 822   for (uint32 i = 0; i < InternalChildCount(); i++) {
 823     BrowserAccessibility* child = InternalGetChild(i);
 824     if (child->GetRole() != ui::AX_ROLE_STATIC_TEXT &&
 825         child->GetRole() != ui::AX_ROLE_IMAGE) {
 826       return false;
 827     }
 828   }
 829   return true;
 830 }
 831
 832 bool BrowserAccessibilityAndroid::IsIframe() const {
 833   base::string16 html_tag = GetString16Attribute(
 834       ui::AX_ATTR_HTML_TAG);
 835   return html_tag == base::ASCIIToUTF16("iframe");
 836 }
 837
 838 void BrowserAccessibilityAndroid::OnDataChanged() {
 839   BrowserAccessibility::OnDataChanged();
 840
 841   if (IsEditableText()) {
 842     base::string16 value = GetString16Attribute(ui::AX_ATTR_VALUE);
 843     if (value != new_value_) {
 844       old_value_ = new_value_;
 845       new_value_ = value;
 846     }
 847   }
 848
 849   if (GetRole() == ui::AX_ROLE_ALERT && first_time_)
 850     manager()->NotifyAccessibilityEvent(ui::AX_EVENT_ALERT, this);
 851
 852   base::string16 live;
 853   if (GetString16Attribute(
 854       ui::AX_ATTR_CONTAINER_LIVE_STATUS, &live)) {
 855     NotifyLiveRegionUpdate(live);
 856   }
 857
 858   first_time_ = false;
 859 }
 860
 861 void BrowserAccessibilityAndroid::NotifyLiveRegionUpdate(
 862     base::string16& aria_live) {
 863   if (!EqualsASCII(aria_live, aria_strings::kAriaLivePolite) &&
 864       !EqualsASCII(aria_live, aria_strings::kAriaLiveAssertive))
 865     return;
 866
 867   base::string16 text = GetText();
 868   if (cached_text_ != text) {
 869     if (!text.empty()) {
 870       manager()->NotifyAccessibilityEvent(ui::AX_EVENT_SHOW,
 871                                          this);
 872     }
 873     cached_text_ = text;
 874   }
 875 }
 876
 877 int BrowserAccessibilityAndroid::CountChildrenWithRole(ui::AXRole role) const {
 878   int count = 0;
 879   for (uint32 i = 0; i < PlatformChildCount(); i++) {
 880     if (PlatformGetChild(i)->GetRole() == role)
 881       count++;
 882   }
 883   return count;
 884 }
 885
 886 }  // namespace content