Revert of Rename AXObject to AXObjectImpl in modules/ and web/

third_party/WebKit/Source/modules/accessibility/AXObjectImpl.h

-/*
- * Copyright (C) 2008, 2009, 2011 Apple Inc. All rights reserved.
- * Copyright (C) 2008 Nuanti Ltd.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1.  Redistributions of source code must retain the above copyright
- *     notice, this list of conditions and the following disclaimer.
- * 2.  Redistributions in binary form must reproduce the above copyright
- *     notice, this list of conditions and the following disclaimer in the
- *     documentation and/or other materials provided with the distribution.
- * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
- *     its contributors may be used to endorse or promote products derived
- *     from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef AXObjectImpl_h
-#define AXObjectImpl_h
-
-#include "core/editing/VisiblePosition.h"
-#include "core/editing/markers/DocumentMarker.h"
-#include "core/inspector/protocol/Accessibility.h"
-#include "modules/ModulesExport.h"
-#include "platform/geometry/FloatQuad.h"
-#include "platform/geometry/LayoutRect.h"
-#include "platform/graphics/Color.h"
-#include "platform/wtf/Forward.h"
-#include "platform/wtf/Vector.h"
-
-class SkMatrix44;
-
-namespace blink {
-
-class AXObjectImpl;
-class AXObjectCacheImpl;
-class Element;
-class FrameView;
-class IntPoint;
-class Node;
-class LayoutObject;
-class ScrollableArea;
-
-enum class AOMStringProperty;
-
-typedef unsigned AXID;
-
-enum AccessibilityRole {
-  kUnknownRole = 0,
-  kAbbrRole,  // No mapping to ARIA role.
-  kAlertDialogRole,
-  kAlertRole,
-  kAnchorRole,      // No mapping to ARIA role.
-  kAnnotationRole,  // No mapping to ARIA role.
-  kApplicationRole,
-  kArticleRole,
-  kAudioRole,  // No mapping to ARIA role.
-  kBannerRole,
-  kBlockquoteRole,     // No mapping to ARIA role.
-  kBusyIndicatorRole,  // No mapping to ARIA role.
-  kButtonRole,
-  kCanvasRole,   // No mapping to ARIA role.
-  kCaptionRole,  // No mapping to ARIA role.
-  kCellRole,
-  kCheckBoxRole,
-  kColorWellRole,  // No mapping to ARIA role.
-  kColumnHeaderRole,
-  kColumnRole,  // No mapping to ARIA role.
-  kComboBoxRole,
-  kComplementaryRole,
-  kContentInfoRole,
-  kDateRole,      // No mapping to ARIA role.
-  kDateTimeRole,  // No mapping to ARIA role.
-  kDefinitionRole,
-  kDescriptionListDetailRole,  // No mapping to ARIA role.
-  kDescriptionListRole,        // No mapping to ARIA role.
-  kDescriptionListTermRole,    // No mapping to ARIA role.
-  kDetailsRole,                // No mapping to ARIA role.
-  kDialogRole,
-  kDirectoryRole,
-  kDisclosureTriangleRole,  // No mapping to ARIA role.
-  kDivRole,                 // No mapping to ARIA role.
-  kDocumentRole,
-  kEmbeddedObjectRole,  // No mapping to ARIA role.
-  kFeedRole,
-  kFigcaptionRole,  // No mapping to ARIA role.
-  kFigureRole,
-  kFooterRole,
-  kFormRole,
-  kGridRole,
-  kGroupRole,
-  kHeadingRole,
-  kIframePresentationalRole,  // No mapping to ARIA role.
-  kIframeRole,                // No mapping to ARIA role.
-  kIgnoredRole,               // No mapping to ARIA role.
-  kImageMapLinkRole,          // No mapping to ARIA role.
-  kImageMapRole,              // No mapping to ARIA role.
-  kImageRole,
-  kInlineTextBoxRole,  // No mapping to ARIA role.
-  kInputTimeRole,      // No mapping to ARIA role.
-  kLabelRole,
-  kLegendRole,     // No mapping to ARIA role.
-  kLineBreakRole,  // No mapping to ARIA role.
-  kLinkRole,
-  kListBoxOptionRole,
-  kListBoxRole,
-  kListItemRole,
-  kListMarkerRole,  // No mapping to ARIA role.
-  kListRole,
-  kLogRole,
-  kMainRole,
-  kMarkRole,  // No mapping to ARIA role.
-  kMarqueeRole,
-  kMathRole,
-  kMenuBarRole,
-  kMenuButtonRole,
-  kMenuItemRole,
-  kMenuItemCheckBoxRole,
-  kMenuItemRadioRole,
-  kMenuListOptionRole,
-  kMenuListPopupRole,
-  kMenuRole,
-  kMeterRole,
-  kNavigationRole,
-  kNoneRole,  // No mapping to ARIA role.
-  kNoteRole,
-  kOutlineRole,    // No mapping to ARIA role.
-  kParagraphRole,  // No mapping to ARIA role.
-  kPopUpButtonRole,
-  kPreRole,  // No mapping to ARIA role.
-  kPresentationalRole,
-  kProgressIndicatorRole,
-  kRadioButtonRole,
-  kRadioGroupRole,
-  kRegionRole,
-  kRootWebAreaRole,  // No mapping to ARIA role.
-  kRowHeaderRole,
-  kRowRole,
-  kRubyRole,        // No mapping to ARIA role.
-  kRulerRole,       // No mapping to ARIA role.
-  kSVGRootRole,     // No mapping to ARIA role.
-  kScrollAreaRole,  // No mapping to ARIA role.
-  kScrollBarRole,
-  kSeamlessWebAreaRole,  // No mapping to ARIA role.
-  kSearchRole,
-  kSearchBoxRole,
-  kSliderRole,
-  kSliderThumbRole,     // No mapping to ARIA role.
-  kSpinButtonPartRole,  // No mapping to ARIA role.
-  kSpinButtonRole,
-  kSplitterRole,
-  kStaticTextRole,  // No mapping to ARIA role.
-  kStatusRole,
-  kSwitchRole,
-  kTabGroupRole,  // No mapping to ARIA role.
-  kTabListRole,
-  kTabPanelRole,
-  kTabRole,
-  kTableHeaderContainerRole,  // No mapping to ARIA role.
-  kTableRole,
-  kTermRole,
-  kTextFieldRole,
-  kTimeRole,  // No mapping to ARIA role.
-  kTimerRole,
-  kToggleButtonRole,
-  kToolbarRole,
-  kTreeGridRole,
-  kTreeItemRole,
-  kTreeRole,
-  kUserInterfaceTooltipRole,
-  kVideoRole,    // No mapping to ARIA role.
-  kWebAreaRole,  // No mapping to ARIA role.
-  kWindowRole,   // No mapping to ARIA role.
-  kNumRoles
-};
-
-enum AccessibilityTextSource {
-  kAlternativeText,
-  kChildrenText,
-  kSummaryText,
-  kHelpText,
-  kVisibleText,
-  kTitleTagText,
-  kPlaceholderText,
-  kLabelByElementText,
-};
-
-enum AccessibilityState {
-  kAXBusyState,
-  kAXCheckedState,
-  kAXEnabledState,
-  kAXExpandedState,
-  kAXFocusableState,
-  kAXFocusedState,
-  kAXHaspopupState,
-  kAXHoveredState,
-  kAXInvisibleState,
-  kAXLinkedState,
-  kAXMultilineState,
-  kAXMultiselectableState,
-  kAXOffscreenState,
-  kAXPressedState,
-  kAXProtectedState,
-  kAXReadonlyState,
-  kAXRequiredState,
-  kAXSelectableState,
-  kAXSelectedState,
-  kAXVerticalState,
-  kAXVisitedState
-};
-
-class AccessibilityText final
-    : public GarbageCollectedFinalized<AccessibilityText> {
-  WTF_MAKE_NONCOPYABLE(AccessibilityText);
-
- public:
-  DEFINE_INLINE_TRACE() { visitor->Trace(text_element_); }
-
- private:
-  AccessibilityText(const String& text,
-                    const AccessibilityTextSource& source,
-                    AXObjectImpl* element)
-      : text_(text), text_element_(element) {}
-
-  String text_;
-  Member<AXObjectImpl> text_element_;
-};
-
-enum AccessibilityOrientation {
-  kAccessibilityOrientationUndefined = 0,
-  kAccessibilityOrientationVertical,
-  kAccessibilityOrientationHorizontal,
-};
-
-enum AXObjectInclusion {
-  kIncludeObject,
-  kIgnoreObject,
-  kDefaultBehavior,
-};
-
-enum class AXSupportedAction {
-  kNone = 0,
-  kActivate,
-  kCheck,
-  kClick,
-  kJump,
-  kOpen,
-  kPress,
-  kSelect,
-  kUncheck
-};
-
-enum AccessibilityButtonState {
-  kButtonStateOff = 0,
-  kButtonStateOn,
-  kButtonStateMixed,
-};
-
-enum AccessibilityTextDirection {
-  kAccessibilityTextDirectionLTR,
-  kAccessibilityTextDirectionRTL,
-  kAccessibilityTextDirectionTTB,
-  kAccessibilityTextDirectionBTT
-};
-
-enum SortDirection {
-  kSortDirectionUndefined = 0,
-  kSortDirectionNone,
-  kSortDirectionAscending,
-  kSortDirectionDescending,
-  kSortDirectionOther
-};
-
-enum AccessibilityExpanded {
-  kExpandedUndefined = 0,
-  kExpandedCollapsed,
-  kExpandedExpanded,
-};
-
-enum AccessibilityOptionalBool {
-  kOptionalBoolUndefined = 0,
-  kOptionalBoolTrue,
-  kOptionalBoolFalse
-};
-
-enum AriaCurrentState {
-  kAriaCurrentStateUndefined = 0,
-  kAriaCurrentStateFalse,
-  kAriaCurrentStateTrue,
-  kAriaCurrentStatePage,
-  kAriaCurrentStateStep,
-  kAriaCurrentStateLocation,
-  kAriaCurrentStateDate,
-  kAriaCurrentStateTime
-};
-
-enum InvalidState {
-  kInvalidStateUndefined = 0,
-  kInvalidStateFalse,
-  kInvalidStateTrue,
-  kInvalidStateSpelling,
-  kInvalidStateGrammar,
-  kInvalidStateOther
-};
-
-enum TextStyle {
-  kTextStyleNone = 0,
-  kTextStyleBold = 1 << 0,
-  kTextStyleItalic = 1 << 1,
-  kTextStyleUnderline = 1 << 2,
-  kTextStyleLineThrough = 1 << 3
-};
-
-enum TextUnderElementMode {
-  kTextUnderElementAll,
-  kTextUnderElementAny  // If the text is unimportant, just whether or not it's
-                        // present
-};
-
-enum class AXBoolAttribute {};
-
-enum class AXStringAttribute {
-  kAriaKeyShortcuts,
-  kAriaRoleDescription,
-};
-
-enum class AXObjectAttribute {
-  kAriaActiveDescendant,
-  kAriaErrorMessage,
-};
-
-enum class AXObjectVectorAttribute {
-  kAriaControls,
-  kAriaDetails,
-  kAriaFlowTo,
-};
-
-class AXSparseAttributeClient {
- public:
-  virtual void AddBoolAttribute(AXBoolAttribute, bool) = 0;
-  virtual void AddStringAttribute(AXStringAttribute, const String&) = 0;
-  virtual void AddObjectAttribute(AXObjectAttribute, AXObjectImpl&) = 0;
-  virtual void AddObjectVectorAttribute(AXObjectVectorAttribute,
-                                        HeapVector<Member<AXObjectImpl>>&) = 0;
-};
-
-// The source of the accessible name of an element. This is needed
-// because on some platforms this determines how the accessible name
-// is exposed.
-enum AXNameFrom {
-  kAXNameFromUninitialized = -1,
-  kAXNameFromAttribute = 0,
-  kAXNameFromAttributeExplicitlyEmpty,
-  kAXNameFromCaption,
-  kAXNameFromContents,
-  kAXNameFromPlaceholder,
-  kAXNameFromRelatedElement,
-  kAXNameFromValue,
-  kAXNameFromTitle,
-};
-
-// The potential native HTML-based text (name, description or placeholder)
-// sources for an element.  See
-// http://rawgit.com/w3c/aria/master/html-aam/html-aam.html#accessible-name-and-description-calculation
-enum AXTextFromNativeHTML {
-  kAXTextFromNativeHTMLUninitialized = -1,
-  kAXTextFromNativeHTMLFigcaption,
-  kAXTextFromNativeHTMLLabel,
-  kAXTextFromNativeHTMLLabelFor,
-  kAXTextFromNativeHTMLLabelWrapped,
-  kAXTextFromNativeHTMLLegend,
-  kAXTextFromNativeHTMLTableCaption,
-  kAXTextFromNativeHTMLTitleElement,
-};
-
-// The source of the accessible description of an element. This is needed
-// because on some platforms this determines how the accessible description
-// is exposed.
-enum AXDescriptionFrom {
-  kAXDescriptionFromUninitialized = -1,
-  kAXDescriptionFromAttribute = 0,
-  kAXDescriptionFromContents,
-  kAXDescriptionFromRelatedElement,
-};
-
-enum AXIgnoredReason {
-  kAXActiveModalDialog,
-  kAXAncestorDisallowsChild,
-  kAXAncestorIsLeafNode,
-  kAXAriaHidden,
-  kAXAriaHiddenRoot,
-  kAXEmptyAlt,
-  kAXEmptyText,
-  kAXInert,
-  kAXInheritsPresentation,
-  kAXLabelContainer,
-  kAXLabelFor,
-  kAXNotRendered,
-  kAXNotVisible,
-  kAXPresentationalRole,
-  kAXProbablyPresentational,
-  kAXStaticTextUsedAsNameFor,
-  kAXUninteresting
-};
-
-class IgnoredReason {
-  DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
-
- public:
-  AXIgnoredReason reason;
-  Member<const AXObjectImpl> related_object;
-
-  explicit IgnoredReason(AXIgnoredReason reason)
-      : reason(reason), related_object(nullptr) {}
-
-  IgnoredReason(AXIgnoredReason r, const AXObjectImpl* obj)
-      : reason(r), related_object(obj) {}
-
-  DEFINE_INLINE_TRACE() { visitor->Trace(related_object); }
-};
-
-class NameSourceRelatedObject
-    : public GarbageCollectedFinalized<NameSourceRelatedObject> {
-  WTF_MAKE_NONCOPYABLE(NameSourceRelatedObject);
-
- public:
-  WeakMember<AXObjectImpl> object;
-  String text;
-
-  NameSourceRelatedObject(AXObjectImpl* object, String text)
-      : object(object), text(text) {}
-
-  DEFINE_INLINE_TRACE() { visitor->Trace(object); }
-};
-
-typedef HeapVector<Member<NameSourceRelatedObject>> AXRelatedObjectVector;
-class NameSource {
-  DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
-
- public:
-  String text;
-  bool superseded = false;
-  bool invalid = false;
-  AXNameFrom type = kAXNameFromUninitialized;
-  const QualifiedName& attribute;
-  AtomicString attribute_value;
-  AXTextFromNativeHTML native_source = kAXTextFromNativeHTMLUninitialized;
-  AXRelatedObjectVector related_objects;
-
-  NameSource(bool superseded, const QualifiedName& attr)
-      : superseded(superseded), attribute(attr) {}
-
-  explicit NameSource(bool superseded)
-      : superseded(superseded), attribute(QualifiedName::Null()) {}
-
-  DEFINE_INLINE_TRACE() { visitor->Trace(related_objects); }
-};
-
-class DescriptionSource {
-  DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
-
- public:
-  String text;
-  bool superseded = false;
-  bool invalid = false;
-  AXDescriptionFrom type = kAXDescriptionFromUninitialized;
-  const QualifiedName& attribute;
-  AtomicString attribute_value;
-  AXTextFromNativeHTML native_source = kAXTextFromNativeHTMLUninitialized;
-  AXRelatedObjectVector related_objects;
-
-  DescriptionSource(bool superseded, const QualifiedName& attr)
-      : superseded(superseded), attribute(attr) {}
-
-  explicit DescriptionSource(bool superseded)
-      : superseded(superseded), attribute(QualifiedName::Null()) {}
-
-  DEFINE_INLINE_TRACE() { visitor->Trace(related_objects); }
-};
-
-}  // namespace blink
-
-WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::IgnoredReason);
-WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::NameSource);
-WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::DescriptionSource);
-
-namespace blink {
-
-class MODULES_EXPORT AXObjectImpl
-    : public GarbageCollectedFinalized<AXObjectImpl> {
-  WTF_MAKE_NONCOPYABLE(AXObjectImpl);
-
- public:
-  typedef HeapVector<Member<AXObjectImpl>> AXObjectVector;
-
-  struct AXRange {
-    DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
-    // The deepest descendant in which the range starts.
-    // (nullptr means the current object.)
-    Persistent<AXObjectImpl> anchor_object;
-    // The number of characters and child objects in the anchor object
-    // before the range starts.
-    int anchor_offset;
-    // When the same character offset could correspond to two possible
-    // cursor positions, upstream means it's on the previous line rather
-    // than the next line.
-    TextAffinity anchor_affinity;
-
-    // The deepest descendant in which the range ends.
-    // (nullptr means the current object.)
-    Persistent<AXObjectImpl> focus_object;
-    // The number of characters and child objects in the focus object
-    // before the range ends.
-    int focus_offset;
-    // When the same character offset could correspond to two possible
-    // cursor positions, upstream means it's on the previous line rather
-    // than the next line.
-    TextAffinity focus_affinity;
-
-    AXRange()
-        : anchor_object(nullptr),
-          anchor_offset(-1),
-          anchor_affinity(TextAffinity::kUpstream),
-          focus_object(nullptr),
-          focus_offset(-1),
-          focus_affinity(TextAffinity::kDownstream) {}
-
-    AXRange(int start_offset, int end_offset)
-        : anchor_object(nullptr),
-          anchor_offset(start_offset),
-          anchor_affinity(TextAffinity::kUpstream),
-          focus_object(nullptr),
-          focus_offset(end_offset),
-          focus_affinity(TextAffinity::kDownstream) {}
-
-    AXRange(AXObjectImpl* anchor_object,
-            int anchor_offset,
-            TextAffinity anchor_affinity,
-            AXObjectImpl* focus_object,
-            int focus_offset,
-            TextAffinity focus_affinity)
-        : anchor_object(anchor_object),
-          anchor_offset(anchor_offset),
-          anchor_affinity(anchor_affinity),
-          focus_object(focus_object),
-          focus_offset(focus_offset),
-          focus_affinity(focus_affinity) {}
-
-    bool IsValid() const {
-      return ((anchor_object && focus_object) ||
-              (!anchor_object && !focus_object)) &&
-             anchor_offset >= 0 && focus_offset >= 0;
-    }
-
-    // Determines if the range only refers to text offsets under the current
-    // object.
-    bool IsSimple() const {
-      return anchor_object == focus_object || !anchor_object || !focus_object;
-    }
-  };
-
- protected:
-  AXObjectImpl(AXObjectCacheImpl&);
-
- public:
-  virtual ~AXObjectImpl();
-  DECLARE_VIRTUAL_TRACE();
-
-  static unsigned NumberOfLiveAXObjects() { return number_of_live_ax_objects_; }
-
-  // After constructing an AXObjectImpl, it must be given a
-  // unique ID, then added to AXObjectCacheImpl, and finally init() must
-  // be called last.
-  void SetAXObjectID(AXID ax_object_id) { id_ = ax_object_id; }
-  virtual void Init() {}
-
-  // When the corresponding WebCore object that this AXObjectImpl
-  // wraps is deleted, it must be detached.
-  virtual void Detach();
-  virtual bool IsDetached() const;
-
-  // If the parent of this object is known, this can be faster than using
-  // computeParent().
-  virtual void SetParent(AXObjectImpl* parent) { parent_ = parent; }
-
-  // The AXObjectCacheImpl that owns this object, and its unique ID within this
-  // cache.
-  AXObjectCacheImpl& AxObjectCache() const {
-    DCHECK(ax_object_cache_);
-    return *ax_object_cache_;
-  }
-
-  AXID AxObjectID() const { return id_; }
-
-  // Wrappers that retrieve either an Accessibility Object Model property,
-  // or the equivalent ARIA attribute, in that order.
-  // TODO(dmazzoni): Add equivalents for other types of properties besides
-  // just strings.
-  const AtomicString& GetAOMPropertyOrARIAAttribute(AOMStringProperty) const;
-
-  virtual void GetSparseAXAttributes(AXSparseAttributeClient&) const {}
-
-  // Determine subclass type.
-  virtual bool IsAXNodeObject() const { return false; }
-  virtual bool IsAXLayoutObject() const { return false; }
-  virtual bool IsAXInlineTextBox() const { return false; }
-  virtual bool IsAXListBox() const { return false; }
-  virtual bool IsAXListBoxOption() const { return false; }
-  virtual bool IsAXRadioInput() const { return false; }
-  virtual bool IsAXSVGRoot() const { return false; }
-
-  // Check object role or purpose.
-  virtual AccessibilityRole RoleValue() const { return role_; }
-  bool IsARIATextControl() const;
-  virtual bool IsARIATreeGridRow() const { return false; }
-  virtual bool IsAXTable() const { return false; }
-  virtual bool IsAnchor() const { return false; }
-  bool IsButton() const;
-  bool IsCheckable() const;
-  bool IsCanvas() const { return RoleValue() == kCanvasRole; }
-  bool IsCheckbox() const { return RoleValue() == kCheckBoxRole; }
-  bool IsCheckboxOrRadio() const { return IsCheckbox() || IsRadioButton(); }
-  bool IsColorWell() const { return RoleValue() == kColorWellRole; }
-  bool IsComboBox() const { return RoleValue() == kComboBoxRole; }
-  virtual bool IsControl() const { return false; }
-  virtual bool IsDataTable() const { return false; }
-  virtual bool IsEmbeddedObject() const { return false; }
-  virtual bool IsFieldset() const { return false; }
-  virtual bool IsHeading() const { return false; }
-  virtual bool IsImage() const { return false; }
-  virtual bool IsImageMapLink() const { return false; }
-  virtual bool IsInputImage() const { return false; }
-  bool IsLandmarkRelated() const;
-  virtual bool IsLink() const { return false; }
-  virtual bool IsInPageLinkTarget() const { return false; }
-  virtual bool IsList() const { return false; }
-  virtual bool IsMenu() const { return false; }
-  virtual bool IsMenuButton() const { return false; }
-  virtual bool IsMenuList() const { return false; }
-  virtual bool IsMenuListOption() const { return false; }
-  virtual bool IsMenuListPopup() const { return false; }
-  bool IsMenuRelated() const;
-  virtual bool IsMeter() const { return false; }
-  virtual bool IsMockObject() const { return false; }
-  virtual bool IsNativeSpinButton() const { return false; }
-  virtual bool IsNativeTextControl() const {
-    return false;
-  }  // input or textarea
-  virtual bool IsNonNativeTextControl() const {
-    return false;
-  }  // contenteditable or role=textbox
-  virtual bool IsPasswordField() const { return false; }
-  virtual bool IsPasswordFieldAndShouldHideValue() const;
-  bool IsPresentational() const {
-    return RoleValue() == kNoneRole || RoleValue() == kPresentationalRole;
-  }
-  virtual bool IsProgressIndicator() const { return false; }
-  bool IsRadioButton() const { return RoleValue() == kRadioButtonRole; }
-  bool IsRange() const {
-    return RoleValue() == kProgressIndicatorRole ||
-           RoleValue() == kScrollBarRole || RoleValue() == kSliderRole ||
-           RoleValue() == kSpinButtonRole;
-  }
-  bool IsScrollbar() const { return RoleValue() == kScrollBarRole; }
-  virtual bool IsSlider() const { return false; }
-  virtual bool IsNativeSlider() const { return false; }
-  virtual bool IsSpinButton() const { return RoleValue() == kSpinButtonRole; }
-  virtual bool IsSpinButtonPart() const { return false; }
-  bool IsTabItem() const { return RoleValue() == kTabRole; }
-  virtual bool IsTableCell() const { return false; }
-  virtual bool IsTableRow() const { return false; }
-  virtual bool IsTextControl() const { return false; }
-  virtual bool IsTableCol() const { return false; }
-  bool IsTree() const { return RoleValue() == kTreeRole; }
-  bool IsWebArea() const { return RoleValue() == kWebAreaRole; }
-
-  // Check object state.
-  virtual bool IsClickable() const;
-  virtual bool IsCollapsed() const { return false; }
-  virtual bool IsEnabled() const { return false; }
-  virtual AccessibilityExpanded IsExpanded() const {
-    return kExpandedUndefined;
-  }
-  virtual bool IsFocused() const { return false; }
-  virtual bool IsHovered() const { return false; }
-  virtual bool IsLinked() const { return false; }
-  virtual bool IsLoaded() const { return false; }
-  virtual bool IsModal() const { return false; }
-  virtual bool IsMultiSelectable() const { return false; }
-  virtual bool IsOffScreen() const { return false; }
-  virtual bool IsPressed() const { return false; }
-  virtual bool IsReadOnly() const { return false; }
-  virtual bool IsRequired() const { return false; }
-  virtual bool IsSelected() const { return false; }
-  virtual bool IsSelectedOptionActive() const { return false; }
-  virtual bool IsVisible() const { return true; }
-  virtual bool IsVisited() const { return false; }
-
-  // Check whether certain properties can be modified.
-  virtual bool CanSetFocusAttribute() const { return false; }
-  virtual bool CanSetValueAttribute() const { return false; }
-  virtual bool CanSetSelectedAttribute() const { return false; }
-
-  // Whether objects are ignored, i.e. not included in the tree.
-  bool AccessibilityIsIgnored() const;
-  typedef HeapVector<IgnoredReason> IgnoredReasons;
-  virtual bool ComputeAccessibilityIsIgnored(IgnoredReasons* = nullptr) const {
-    return true;
-  }
-  bool AccessibilityIsIgnoredByDefault(IgnoredReasons* = nullptr) const;
-  AXObjectInclusion AccessibilityPlatformIncludesObject() const;
-  virtual AXObjectInclusion DefaultObjectInclusion(
-      IgnoredReasons* = nullptr) const;
-  bool IsInertOrAriaHidden() const;
-  const AXObjectImpl* AriaHiddenRoot() const;
-  bool ComputeIsInertOrAriaHidden(IgnoredReasons* = nullptr) const;
-  bool IsDescendantOfLeafNode() const;
-  AXObjectImpl* LeafNodeAncestor() const;
-  bool IsDescendantOfDisabledNode() const;
-  const AXObjectImpl* DisabledAncestor() const;
-  bool LastKnownIsIgnoredValue();
-  void SetLastKnownIsIgnoredValue(bool);
-  bool HasInheritedPresentationalRole() const;
-  bool IsPresentationalChild() const;
-  bool AncestorExposesActiveDescendant() const;
-  bool ComputeAncestorExposesActiveDescendant() const;
-
-  //
-  // Accessible name calculation
-  //
-
-  // Retrieves the accessible name of the object, an enum indicating where the
-  // name was derived from, and a list of objects that were used to derive the
-  // name, if any.
-  virtual String GetName(AXNameFrom&, AXObjectVector* name_objects) const;
-
-  typedef HeapVector<NameSource> NameSources;
-  // Retrieves the accessible name of the object and a list of all potential
-  // sources for the name, indicating which were used.
-  virtual String GetName(NameSources*) const;
-
-  typedef HeapVector<DescriptionSource> DescriptionSources;
-  // Takes the result of nameFrom from calling |name|, above, and retrieves the
-  // accessible description of the object, which is secondary to |name|, an enum
-  // indicating where the description was derived from, and a list of objects
-  // that were used to derive the description, if any.
-  virtual String Description(AXNameFrom,
-                             AXDescriptionFrom&,
-                             AXObjectVector* description_objects) const {
-    return String();
-  }
-
-  // Same as above, but returns a list of all potential sources for the
-  // description, indicating which were used.
-  virtual String Description(AXNameFrom,
-                             AXDescriptionFrom&,
-                             DescriptionSources*,
-                             AXRelatedObjectVector*) const {
-    return String();
-  }
-
-  // Takes the result of nameFrom and descriptionFrom from calling |name| and
-  // |description|, above, and retrieves the placeholder of the object, if
-  // present and if it wasn't already exposed by one of the two functions above.
-  virtual String Placeholder(AXNameFrom) const { return String(); }
-
-  // Internal functions used by name and description, above.
-  typedef HeapHashSet<Member<const AXObjectImpl>> AXObjectSet;
-  virtual String TextAlternative(bool recursive,
-                                 bool in_aria_labelled_by_traversal,
-                                 AXObjectSet& visited,
-                                 AXNameFrom& name_from,
-                                 AXRelatedObjectVector* related_objects,
-                                 NameSources* name_sources) const {
-    return String();
-  }
-  virtual String TextFromDescendants(AXObjectSet& visited,
-                                     bool recursive) const {
-    return String();
-  }
-
-  // Returns result of Accessible Name Calculation algorithm.
-  // This is a simpler high-level interface to |name| used by Inspector.
-  String ComputedName() const;
-
-  // Internal function used to determine whether the result of calling |name| on
-  // this object would return text that came from the an HTML label element or
-  // not. This is intended to be faster than calling |name| or
-  // |textAlternative|, and without side effects (it won't call
-  // axObjectCache->getOrCreate).
-  virtual bool NameFromLabelElement() const { return false; }
-
-  //
-  // Properties of static elements.
-  //
-
-  virtual const AtomicString& AccessKey() const { return g_null_atom; }
-  RGBA32 BackgroundColor() const;
-  virtual RGBA32 ComputeBackgroundColor() const { return Color::kTransparent; }
-  virtual RGBA32 GetColor() const { return Color::kBlack; }
-  // Used by objects of role ColorWellRole.
-  virtual RGBA32 ColorValue() const { return Color::kTransparent; }
-  virtual bool CanvasHasFallbackContent() const { return false; }
-  virtual String FontFamily() const { return g_null_atom; }
-  // Font size is in pixels.
-  virtual float FontSize() const { return 0.0f; }
-  // Value should be 1-based. 0 means not supported.
-  virtual int HeadingLevel() const { return 0; }
-  // Value should be 1-based. 0 means not supported.
-  virtual unsigned HierarchicalLevel() const { return 0; }
-  // Return the content of an image or canvas as an image data url in
-  // PNG format. If |maxSize| is not empty and if the image is larger than
-  // those dimensions, the image will be resized proportionally first to fit.
-  virtual String ImageDataUrl(const IntSize& max_size) const {
-    return g_null_atom;
-  }
-  virtual AXObjectImpl* InPageLinkTarget() const { return nullptr; }
-  virtual AccessibilityOrientation Orientation() const;
-  virtual String GetText() const { return String(); }
-  virtual AccessibilityTextDirection GetTextDirection() const {
-    return kAccessibilityTextDirectionLTR;
-  }
-  virtual int TextLength() const { return 0; }
-  virtual TextStyle GetTextStyle() const { return kTextStyleNone; }
-  virtual AXObjectVector RadioButtonsInGroup() const {
-    return AXObjectVector();
-  }
-  virtual KURL Url() const { return KURL(); }
-
-  // Load inline text boxes for just this node, even if
-  // settings->inlineTextBoxAccessibilityEnabled() is false.
-  virtual void LoadInlineTextBoxes() {}
-
-  // Walk the AXObjects on the same line. This is supported on any
-  // object type but primarily intended to be used for inline text boxes.
-  virtual AXObjectImpl* NextOnLine() const { return nullptr; }
-  virtual AXObjectImpl* PreviousOnLine() const { return nullptr; }
-
-  // For all node objects. The start and end character offset of each
-  // marker, such as spelling or grammar error.
-  virtual void Markers(Vector<DocumentMarker::MarkerType>&,
-                       Vector<AXRange>&) const {}
-  // For an inline text box.
-  // The integer horizontal pixel offset of each character in the string;
-  // negative values for RTL.
-  virtual void TextCharacterOffsets(Vector<int>&) const {}
-  // The start and end character offset of each word in the object's text.
-  virtual void GetWordBoundaries(Vector<AXRange>&) const {}
-
-  // Properties of interactive elements.
-  AXSupportedAction Action() const;
-  AccessibilityButtonState CheckedState() const;
-  virtual AriaCurrentState GetAriaCurrentState() const {
-    return kAriaCurrentStateUndefined;
-  }
-  virtual InvalidState GetInvalidState() const {
-    return kInvalidStateUndefined;
-  }
-  // Only used when invalidState() returns InvalidStateOther.
-  virtual String AriaInvalidValue() const { return String(); }
-  virtual String ValueDescription() const { return String(); }
-  virtual float ValueForRange() const { return 0.0f; }
-  virtual float MaxValueForRange() const { return 0.0f; }
-  virtual float MinValueForRange() const { return 0.0f; }
-  virtual String StringValue() const { return String(); }
-
-  // ARIA attributes.
-  virtual AXObjectImpl* ActiveDescendant() { return nullptr; }
-  virtual String AriaAutoComplete() const { return String(); }
-  virtual void AriaOwnsElements(AXObjectVector& owns) const {}
-  virtual void AriaDescribedbyElements(AXObjectVector&) const {}
-  virtual void AriaLabelledbyElements(AXObjectVector&) const {}
-  virtual bool AriaHasPopup() const { return false; }
-  virtual bool IsEditable() const { return false; }
-  bool IsMultiline() const;
-  virtual bool IsRichlyEditable() const { return false; }
-  bool AriaPressedIsPresent() const;
-  virtual AccessibilityRole AriaRoleAttribute() const { return kUnknownRole; }
-  virtual bool AriaRoleHasPresentationalChildren() const { return false; }
-  virtual AXObjectImpl* AncestorForWhichThisIsAPresentationalChild() const {
-    return 0;
-  }
-  bool SupportsActiveDescendant() const;
-  bool SupportsARIAAttributes() const;
-  virtual bool SupportsARIADragging() const { return false; }
-  virtual bool SupportsARIADropping() const { return false; }
-  virtual bool SupportsARIAFlowTo() const { return false; }
-  virtual bool SupportsARIAOwns() const { return false; }
-  bool SupportsRangeValue() const;
-  virtual SortDirection GetSortDirection() const {
-    return kSortDirectionUndefined;
-  }
-
-  // Returns 0-based index.
-  int IndexInParent() const;
-
-  // Value should be 1-based. 0 means not supported.
-  virtual int PosInSet() const { return 0; }
-  virtual int SetSize() const { return 0; }
-  bool SupportsSetSizeAndPosInSet() const;
-
-  // ARIA live-region features.
-  bool IsLiveRegion() const;
-  AXObjectImpl* LiveRegionRoot() const;
-  virtual const AtomicString& LiveRegionStatus() const { return g_null_atom; }
-  virtual const AtomicString& LiveRegionRelevant() const { return g_null_atom; }
-  virtual bool LiveRegionAtomic() const { return false; }
-  virtual bool LiveRegionBusy() const { return false; }
-
-  const AtomicString& ContainerLiveRegionStatus() const;
-  const AtomicString& ContainerLiveRegionRelevant() const;
-  bool ContainerLiveRegionAtomic() const;
-  bool ContainerLiveRegionBusy() const;
-
-  // Every object's bounding box is returned relative to a
-  // container object (which is guaranteed to be an ancestor) and
-  // optionally a transformation matrix that needs to be applied too.
-  // To compute the absolute bounding box of an element, start with its
-  // boundsInContainer and apply the transform. Then as long as its container is
-  // not null, walk up to its container and offset by the container's offset
-  // from origin, the container's scroll position if any, and apply the
-  // container's transform.  Do this until you reach the root of the tree.
-  virtual void GetRelativeBounds(AXObjectImpl** out_container,
-                                 FloatRect& out_bounds_in_container,
-                                 SkMatrix44& out_container_transform) const;
-
-  // Get the bounds in frame-relative coordinates as a LayoutRect.
-  LayoutRect GetBoundsInFrameCoordinates() const;
-
-  // Explicitly set an object's bounding rect and offset container.
-  void SetElementRect(LayoutRect r, AXObjectImpl* container) {
-    explicit_element_rect_ = r;
-    explicit_container_id_ = container->AxObjectID();
-  }
-
-  // Hit testing.
-  // Called on the root AX object to return the deepest available element.
-  virtual AXObjectImpl* AccessibilityHitTest(const IntPoint&) const {
-    return 0;
-  }
-  // Called on the AX object after the layout tree determines which is the right
-  // AXLayoutObject.
-  virtual AXObjectImpl* ElementAccessibilityHitTest(const IntPoint&) const;
-
-  // High-level accessibility tree access. Other modules should only use these
-  // functions.
-  const AXObjectVector& Children();
-  AXObjectImpl* ParentObject() const;
-  AXObjectImpl* ParentObjectIfExists() const;
-  virtual AXObjectImpl* ComputeParent() const = 0;
-  virtual AXObjectImpl* ComputeParentIfExists() const { return 0; }
-  AXObjectImpl* CachedParentObject() const { return parent_; }
-  AXObjectImpl* ParentObjectUnignored() const;
-
-  // Low-level accessibility tree exploration, only for use within the
-  // accessibility module.
-  virtual AXObjectImpl* RawFirstChild() const { return 0; }
-  virtual AXObjectImpl* RawNextSibling() const { return 0; }
-  virtual void AddChildren() {}
-  virtual bool CanHaveChildren() const { return true; }
-  bool HasChildren() const { return have_children_; }
-  virtual void UpdateChildrenIfNecessary();
-  virtual bool NeedsToUpdateChildren() const { return false; }
-  virtual void SetNeedsToUpdateChildren() {}
-  virtual void ClearChildren();
-  virtual void DetachFromParent() { parent_ = 0; }
-  virtual AXObjectImpl* ScrollBar(AccessibilityOrientation) { return 0; }
-
-  // Properties of the object's owning document or page.
-  virtual double EstimatedLoadingProgress() const { return 0; }
-
-  // DOM and layout tree access.
-  virtual Node* GetNode() const { return 0; }
-  virtual LayoutObject* GetLayoutObject() const { return 0; }
-  virtual Document* GetDocument() const;
-  virtual FrameView* DocumentFrameView() const;
-  virtual Element* AnchorElement() const { return 0; }
-  virtual Element* ActionElement() const { return 0; }
-  String Language() const;
-  bool HasAttribute(const QualifiedName&) const;
-  const AtomicString& GetAttribute(const QualifiedName&) const;
-
-  // Methods that retrieve or manipulate the current selection.
-
-  // Get the current selection from anywhere in the accessibility tree.
-  virtual AXRange Selection() const { return AXRange(); }
-  // Gets only the start and end offsets of the selection computed using the
-  // current object as the starting point. Returns a null selection if there is
-  // no selection in the subtree rooted at this object.
-  virtual AXRange SelectionUnderObject() const { return AXRange(); }
-  virtual void SetSelection(const AXRange&) {}
-
-  // Scrollable containers.
-  bool IsScrollableContainer() const;
-  IntPoint GetScrollOffset() const;
-  IntPoint MinimumScrollOffset() const;
-  IntPoint MaximumScrollOffset() const;
-  void SetScrollOffset(const IntPoint&) const;
-
-  // If this object itself scrolls, return its ScrollableArea.
-  virtual ScrollableArea* GetScrollableAreaIfScrollable() const { return 0; }
-
-  // Modify or take an action on an object.
-  virtual void Increment() {}
-  virtual void Decrement() {}
-  bool PerformDefaultAction() { return Press(); }
-  virtual bool Press();
-  // Make this object visible by scrolling as many nested scrollable views as
-  // needed.
-  void ScrollToMakeVisible() const;
-  // Same, but if the whole object can't be made visible, try for this subrect,
-  // in local coordinates.
-  void ScrollToMakeVisibleWithSubFocus(const IntRect&) const;
-  // Scroll this object to a given point in global coordinates of the top-level
-  // window.
-  void ScrollToGlobalPoint(const IntPoint&) const;
-  virtual void SetFocused(bool) {}
-  virtual void SetSelected(bool) {}
-  virtual void SetSequentialFocusNavigationStartingPoint();
-  virtual void SetValue(const String&) {}
-  virtual void SetValue(float) {}
-
-  // Notifications that this object may have changed.
-  virtual void ChildrenChanged() {}
-  virtual void HandleActiveDescendantChanged() {}
-  virtual void HandleAriaExpandedChanged() {}
-  void NotifyIfIgnoredValueChanged();
-  virtual void SelectionChanged();
-  virtual void TextChanged() {}
-  virtual void UpdateAccessibilityRole() {}
-
-  // Text metrics. Most of these should be deprecated, needs major cleanup.
-  virtual VisiblePosition VisiblePositionForIndex(int) const {
-    return VisiblePosition();
-  }
-  int LineForPosition(const VisiblePosition&) const;
-  virtual int Index(const VisiblePosition&) const { return -1; }
-  virtual void LineBreaks(Vector<int>&) const {}
-
-  // Static helper functions.
-  static bool IsARIAControl(AccessibilityRole);
-  static bool IsARIAInput(AccessibilityRole);
-  static AccessibilityRole AriaRoleToWebCoreRole(const String&);
-  static const AtomicString& RoleName(AccessibilityRole);
-  static const AtomicString& InternalRoleName(AccessibilityRole);
-  static bool IsInsideFocusableElementOrARIAWidget(const Node&);
-
- protected:
-  AXID id_;
-  AXObjectVector children_;
-  mutable bool have_children_;
-  AccessibilityRole role_;
-  AXObjectInclusion last_known_is_ignored_value_;
-  LayoutRect explicit_element_rect_;
-  AXID explicit_container_id_;
-
-  // Used only inside textAlternative():
-  static String CollapseWhitespace(const String&);
-  static String RecursiveTextAlternative(const AXObjectImpl&,
-                                         bool in_aria_labelled_by_traversal,
-                                         AXObjectSet& visited);
-  bool IsHiddenForTextAlternativeCalculation() const;
-  String AriaTextAlternative(bool recursive,
-                             bool in_aria_labelled_by_traversal,
-                             AXObjectSet& visited,
-                             AXNameFrom&,
-                             AXRelatedObjectVector*,
-                             NameSources*,
-                             bool* found_text_alternative) const;
-  String TextFromElements(bool in_aria_labelled_by_traversal,
-                          AXObjectSet& visited,
-                          HeapVector<Member<Element>>& elements,
-                          AXRelatedObjectVector* related_objects) const;
-  void TokenVectorFromAttribute(Vector<String>&, const QualifiedName&) const;
-  void ElementsFromAttribute(HeapVector<Member<Element>>& elements,
-                             const QualifiedName&) const;
-  void AriaLabelledbyElementVector(HeapVector<Member<Element>>& elements) const;
-  String TextFromAriaLabelledby(AXObjectSet& visited,
-                                AXRelatedObjectVector* related_objects) const;
-  String TextFromAriaDescribedby(AXRelatedObjectVector* related_objects) const;
-
-  virtual const AXObjectImpl* InheritsPresentationalRoleFrom() const {
-    return 0;
-  }
-
-  virtual bool NameFromContents() const;
-
-  AccessibilityRole ButtonRoleType() const;
-
-  virtual LayoutObject* LayoutObjectForRelativeBounds() const {
-    return nullptr;
-  }
-
-  mutable Member<AXObjectImpl> parent_;
-
-  // The following cached attribute values (the ones starting with m_cached*)
-  // are only valid if m_lastModificationCount matches
-  // AXObjectCacheImpl::modificationCount().
-  mutable int last_modification_count_;
-  mutable RGBA32 cached_background_color_;
-  mutable bool cached_is_ignored_ : 1;
-  mutable bool cached_is_inert_or_aria_hidden_ : 1;
-  mutable bool cached_is_descendant_of_leaf_node_ : 1;
-  mutable bool cached_is_descendant_of_disabled_node_ : 1;
-  mutable bool cached_has_inherited_presentational_role_ : 1;
-  mutable bool cached_is_presentational_child_ : 1;
-  mutable bool cached_ancestor_exposes_active_descendant_ : 1;
-  mutable Member<AXObjectImpl> cached_live_region_root_;
-
-  Member<AXObjectCacheImpl> ax_object_cache_;
-
-  // Updates the cached attribute values. This may be recursive, so to prevent
-  // deadlocks,
-  // functions called here may only search up the tree (ancestors), not down.
-  void UpdateCachedAttributeValuesIfNeeded() const;
-
- private:
-  static bool IsNativeInputInMixedState(const Node*);
-  static bool IncludesARIAWidgetRole(const String&);
-  static bool HasInteractiveARIAAttribute(const Element&);
-
-  static unsigned number_of_live_ax_objects_;
-};
-
-#define DEFINE_AX_OBJECT_TYPE_CASTS(thisType, predicate)               \
-  DEFINE_TYPE_CASTS(thisType, AXObjectImpl, object, object->predicate, \
-                    object.predicate)
-
-}  // namespace blink
-
-#endif  // AXObjectImpl_h