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AXObjectCache.h
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AXObjectCache.h
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/*
* Copyright (C) 2003, 2006, 2007, 2008, 2009, 2010, 2011, 2015 Apple Inc. All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 INC. OR
* 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.
*/
#pragma once
#include "AXTextStateChangeIntent.h"
#include "AccessibilityObject.h"
#include "Range.h"
#include "Timer.h"
#include "VisibleUnits.h"
#include <limits.h>
#include <wtf/Forward.h>
#include <wtf/HashMap.h>
#include <wtf/HashSet.h>
#include <wtf/ListHashSet.h>
#include <wtf/RefPtr.h>
namespace WebCore {
class Document;
class HTMLAreaElement;
class HTMLTextFormControlElement;
class Node;
class Page;
class RenderBlock;
class RenderObject;
class RenderText;
class ScrollView;
class VisiblePosition;
class Widget;
struct TextMarkerData {
AXID axID { 0 };
Node* node { nullptr };
int offset { 0 };
int characterStartIndex { 0 };
int characterOffset { 0 };
bool ignored { false };
EAffinity affinity { DOWNSTREAM };
};
struct CharacterOffset {
Node* node;
int startIndex;
int offset;
int remainingOffset;
CharacterOffset(Node* n = nullptr, int startIndex = 0, int offset = 0, int remaining = 0)
: node(n)
, startIndex(startIndex)
, offset(offset)
, remainingOffset(remaining)
{ }
int remaining() const { return remainingOffset; }
bool isNull() const { return !node; }
bool isEqual(CharacterOffset& other) const
{
if (isNull() || other.isNull())
return false;
return node == other.node && startIndex == other.startIndex && offset == other.offset;
}
};
class AXComputedObjectAttributeCache {
public:
AccessibilityObjectInclusion getIgnored(AXID) const;
void setIgnored(AXID, AccessibilityObjectInclusion);
private:
struct CachedAXObjectAttributes {
CachedAXObjectAttributes() : ignored(DefaultBehavior) { }
AccessibilityObjectInclusion ignored;
};
HashMap<AXID, CachedAXObjectAttributes> m_idMapping;
};
struct VisiblePositionIndex {
int value = -1;
RefPtr<ContainerNode> scope;
};
struct VisiblePositionIndexRange {
VisiblePositionIndex startIndex;
VisiblePositionIndex endIndex;
bool isNull() const { return startIndex.value == -1 || endIndex.value == -1; }
};
class AccessibilityReplacedText {
public:
AccessibilityReplacedText() { }
AccessibilityReplacedText(const VisibleSelection&);
void postTextStateChangeNotification(AXObjectCache*, AXTextEditType, const String&, const VisibleSelection&);
const VisiblePositionIndexRange& replacedRange() { return m_replacedRange; }
protected:
String m_replacedText;
VisiblePositionIndexRange m_replacedRange;
};
#if !PLATFORM(COCOA)
enum AXTextChange { AXTextInserted, AXTextDeleted, AXTextAttributesChanged };
#endif
enum PostTarget { TargetElement, TargetObservableParent };
enum PostType { PostSynchronously, PostAsynchronously };
class AXObjectCache {
WTF_MAKE_NONCOPYABLE(AXObjectCache); WTF_MAKE_FAST_ALLOCATED;
public:
explicit AXObjectCache(Document&);
~AXObjectCache();
WEBCORE_EXPORT static AccessibilityObject* focusedUIElementForPage(const Page*);
// Returns the root object for the entire document.
WEBCORE_EXPORT AccessibilityObject* rootObject();
// Returns the root object for a specific frame.
WEBCORE_EXPORT AccessibilityObject* rootObjectForFrame(Frame*);
// For AX objects with elements that back them.
AccessibilityObject* getOrCreate(RenderObject*);
AccessibilityObject* getOrCreate(Widget*);
WEBCORE_EXPORT AccessibilityObject* getOrCreate(Node*);
// used for objects without backing elements
AccessibilityObject* getOrCreate(AccessibilityRole);
// will only return the AccessibilityObject if it already exists
AccessibilityObject* get(RenderObject*);
AccessibilityObject* get(Widget*);
AccessibilityObject* get(Node*);
void remove(RenderObject*);
void remove(Node*);
void remove(Widget*);
void remove(AXID);
void detachWrapper(AccessibilityObject*, AccessibilityDetachmentType);
void attachWrapper(AccessibilityObject*);
void childrenChanged(Node*, Node* newChild = nullptr);
void childrenChanged(RenderObject*, RenderObject* newChild = nullptr);
void childrenChanged(AccessibilityObject*);
void checkedStateChanged(Node*);
void selectedChildrenChanged(Node*);
void selectedChildrenChanged(RenderObject*);
// Called by a node when text or a text equivalent (e.g. alt) attribute is changed.
void textChanged(Node*);
// Called when a node has just been attached, so we can make sure we have the right subclass of AccessibilityObject.
void updateCacheAfterNodeIsAttached(Node*);
void handleActiveDescendantChanged(Node*);
void handleAriaRoleChanged(Node*);
void handleFocusedUIElementChanged(Node* oldFocusedNode, Node* newFocusedNode);
void handleScrolledToAnchor(const Node* anchorNode);
void handleAriaExpandedChange(Node*);
void handleScrollbarUpdate(ScrollView*);
void handleAriaModalChange(Node*);
Node* ariaModalNode();
void handleAttributeChanged(const QualifiedName& attrName, Element*);
void recomputeIsIgnored(RenderObject* renderer);
#if HAVE(ACCESSIBILITY)
WEBCORE_EXPORT static void enableAccessibility();
WEBCORE_EXPORT static void disableAccessibility();
// Enhanced user interface accessibility can be toggled by the assistive technology.
WEBCORE_EXPORT static void setEnhancedUserInterfaceAccessibility(bool flag);
static bool accessibilityEnabled() { return gAccessibilityEnabled; }
static bool accessibilityEnhancedUserInterfaceEnabled() { return gAccessibilityEnhancedUserInterfaceEnabled; }
#else
static void enableAccessibility() { }
static void disableAccessibility() { }
static void setEnhancedUserInterfaceAccessibility(bool) { }
static bool accessibilityEnabled() { return false; }
static bool accessibilityEnhancedUserInterfaceEnabled() { return false; }
#endif
void removeAXID(AccessibilityObject*);
bool isIDinUse(AXID id) const { return m_idsInUse.contains(id); }
const Element* rootAXEditableElement(const Node*);
bool nodeIsTextControl(const Node*);
AXID platformGenerateAXID() const;
AccessibilityObject* objectFromAXID(AXID id) const { return m_objects.get(id); }
// Text marker utilities.
std::optional<TextMarkerData> textMarkerDataForVisiblePosition(const VisiblePosition&);
std::optional<TextMarkerData> textMarkerDataForFirstPositionInTextControl(HTMLTextFormControlElement&);
void textMarkerDataForCharacterOffset(TextMarkerData&, const CharacterOffset&);
void textMarkerDataForNextCharacterOffset(TextMarkerData&, const CharacterOffset&);
void textMarkerDataForPreviousCharacterOffset(TextMarkerData&, const CharacterOffset&);
VisiblePosition visiblePositionForTextMarkerData(TextMarkerData&);
CharacterOffset characterOffsetForTextMarkerData(TextMarkerData&);
// Use ignoreNextNodeStart/ignorePreviousNodeEnd to determine the behavior when we are at node boundary.
CharacterOffset nextCharacterOffset(const CharacterOffset&, bool ignoreNextNodeStart = true);
CharacterOffset previousCharacterOffset(const CharacterOffset&, bool ignorePreviousNodeEnd = true);
void startOrEndTextMarkerDataForRange(TextMarkerData&, RefPtr<Range>, bool);
CharacterOffset startOrEndCharacterOffsetForRange(RefPtr<Range>, bool, bool enterTextControls = false);
AccessibilityObject* accessibilityObjectForTextMarkerData(TextMarkerData&);
RefPtr<Range> rangeForUnorderedCharacterOffsets(const CharacterOffset&, const CharacterOffset&);
static RefPtr<Range> rangeForNodeContents(Node*);
static int lengthForRange(Range*);
// Word boundary
CharacterOffset nextWordEndCharacterOffset(const CharacterOffset&);
CharacterOffset previousWordStartCharacterOffset(const CharacterOffset&);
RefPtr<Range> leftWordRange(const CharacterOffset&);
RefPtr<Range> rightWordRange(const CharacterOffset&);
// Paragraph
RefPtr<Range> paragraphForCharacterOffset(const CharacterOffset&);
CharacterOffset nextParagraphEndCharacterOffset(const CharacterOffset&);
CharacterOffset previousParagraphStartCharacterOffset(const CharacterOffset&);
// Sentence
RefPtr<Range> sentenceForCharacterOffset(const CharacterOffset&);
CharacterOffset nextSentenceEndCharacterOffset(const CharacterOffset&);
CharacterOffset previousSentenceStartCharacterOffset(const CharacterOffset&);
// Bounds
CharacterOffset characterOffsetForPoint(const IntPoint&, AccessibilityObject*);
IntRect absoluteCaretBoundsForCharacterOffset(const CharacterOffset&);
CharacterOffset characterOffsetForBounds(const IntRect&, bool);
// Lines
CharacterOffset endCharacterOffsetOfLine(const CharacterOffset&);
CharacterOffset startCharacterOffsetOfLine(const CharacterOffset&);
// Index
CharacterOffset characterOffsetForIndex(int, const AccessibilityObject*);
int indexForCharacterOffset(const CharacterOffset&, AccessibilityObject*);
enum AXNotification {
AXActiveDescendantChanged,
AXAutocorrectionOccured,
AXCheckedStateChanged,
AXChildrenChanged,
AXCurrentChanged,
AXFocusedUIElementChanged,
AXLayoutComplete,
AXLoadComplete,
AXNewDocumentLoadComplete,
AXSelectedChildrenChanged,
AXSelectedTextChanged,
AXValueChanged,
AXScrolledToAnchor,
AXLiveRegionCreated,
AXLiveRegionChanged,
AXMenuListItemSelected,
AXMenuListValueChanged,
AXMenuClosed,
AXMenuOpened,
AXRowCountChanged,
AXRowCollapsed,
AXRowExpanded,
AXExpandedChanged,
AXInvalidStatusChanged,
AXTextChanged,
AXAriaAttributeChanged,
AXElementBusyChanged
};
void postNotification(RenderObject*, AXNotification, PostTarget = TargetElement, PostType = PostAsynchronously);
void postNotification(Node*, AXNotification, PostTarget = TargetElement, PostType = PostAsynchronously);
void postNotification(AccessibilityObject*, Document*, AXNotification, PostTarget = TargetElement, PostType = PostAsynchronously);
#ifndef NDEBUG
void showIntent(const AXTextStateChangeIntent&);
#endif
void setTextSelectionIntent(const AXTextStateChangeIntent&);
void setIsSynchronizingSelection(bool);
void postTextStateChangeNotification(Node*, AXTextEditType, const String&, const VisiblePosition&);
void postTextReplacementNotification(Node*, AXTextEditType deletionType, const String& deletedText, AXTextEditType insertionType, const String& insertedText, const VisiblePosition&);
void postTextReplacementNotificationForTextControl(HTMLTextFormControlElement&, const String& deletedText, const String& insertedText);
void postTextStateChangeNotification(Node*, const AXTextStateChangeIntent&, const VisibleSelection&);
void postTextStateChangeNotification(const Position&, const AXTextStateChangeIntent&, const VisibleSelection&);
void postLiveRegionChangeNotification(AccessibilityObject*);
void focusAriaModalNode();
enum AXLoadingEvent {
AXLoadingStarted,
AXLoadingReloaded,
AXLoadingFailed,
AXLoadingFinished
};
void frameLoadingEventNotification(Frame*, AXLoadingEvent);
void clearTextMarkerNodesInUse(Document*);
void startCachingComputedObjectAttributesUntilTreeMutates();
void stopCachingComputedObjectAttributes();
AXComputedObjectAttributeCache* computedObjectAttributeCache() { return m_computedObjectAttributeCache.get(); }
Document& document() const { return m_document; }
#if PLATFORM(MAC)
static void setShouldRepostNotificationsForTests(bool value);
#endif
void deferRecomputeIsIgnored(Element*);
void deferTextChangedIfNeeded(Node*);
void performDeferredCacheUpdate();
RefPtr<Range> rangeMatchesTextNearRange(RefPtr<Range>, const String&);
protected:
void postPlatformNotification(AccessibilityObject*, AXNotification);
void platformHandleFocusedUIElementChanged(Node* oldFocusedNode, Node* newFocusedNode);
#if PLATFORM(COCOA)
void postTextStateChangePlatformNotification(AccessibilityObject*, const AXTextStateChangeIntent&, const VisibleSelection&);
void postTextStateChangePlatformNotification(AccessibilityObject*, AXTextEditType, const String&, const VisiblePosition&);
void postTextReplacementPlatformNotificationForTextControl(AccessibilityObject*, const String& deletedText, const String& insertedText, HTMLTextFormControlElement&);
void postTextReplacementPlatformNotification(AccessibilityObject*, AXTextEditType, const String&, AXTextEditType, const String&, const VisiblePosition&);
#else
static AXTextChange textChangeForEditType(AXTextEditType);
void nodeTextChangePlatformNotification(AccessibilityObject*, AXTextChange, unsigned, const String&);
#endif
void frameLoadingEventPlatformNotification(AccessibilityObject*, AXLoadingEvent);
void textChanged(AccessibilityObject*);
void labelChanged(Element*);
// This is a weak reference cache for knowing if Nodes used by TextMarkers are valid.
void setNodeInUse(Node* n) { m_textMarkerNodes.add(n); }
void removeNodeForUse(Node* n) { m_textMarkerNodes.remove(n); }
bool isNodeInUse(Node* n) { return m_textMarkerNodes.contains(n); }
// CharacterOffset functions.
enum TraverseOption { TraverseOptionDefault = 1 << 0, TraverseOptionToNodeEnd = 1 << 1, TraverseOptionIncludeStart = 1 << 2, TraverseOptionValidateOffset = 1 << 3, TraverseOptionDoNotEnterTextControls = 1 << 4 };
Node* nextNode(Node*) const;
Node* previousNode(Node*) const;
CharacterOffset traverseToOffsetInRange(RefPtr<Range>, int, TraverseOption = TraverseOptionDefault, bool stayWithinRange = false);
VisiblePosition visiblePositionFromCharacterOffset(const CharacterOffset&);
CharacterOffset characterOffsetFromVisiblePosition(const VisiblePosition&);
void setTextMarkerDataWithCharacterOffset(TextMarkerData&, const CharacterOffset&);
UChar32 characterAfter(const CharacterOffset&);
UChar32 characterBefore(const CharacterOffset&);
CharacterOffset characterOffsetForNodeAndOffset(Node&, int, TraverseOption = TraverseOptionDefault);
CharacterOffset previousBoundary(const CharacterOffset&, BoundarySearchFunction);
CharacterOffset nextBoundary(const CharacterOffset&, BoundarySearchFunction);
CharacterOffset startCharacterOffsetOfWord(const CharacterOffset&, EWordSide = RightWordIfOnBoundary);
CharacterOffset endCharacterOffsetOfWord(const CharacterOffset&, EWordSide = RightWordIfOnBoundary);
CharacterOffset startCharacterOffsetOfParagraph(const CharacterOffset&, EditingBoundaryCrossingRule = CannotCrossEditingBoundary);
CharacterOffset endCharacterOffsetOfParagraph(const CharacterOffset&, EditingBoundaryCrossingRule = CannotCrossEditingBoundary);
CharacterOffset startCharacterOffsetOfSentence(const CharacterOffset&);
CharacterOffset endCharacterOffsetOfSentence(const CharacterOffset&);
CharacterOffset characterOffsetForPoint(const IntPoint&);
LayoutRect localCaretRectForCharacterOffset(RenderObject*&, const CharacterOffset&);
bool shouldSkipBoundary(const CharacterOffset&, const CharacterOffset&);
private:
AccessibilityObject* rootWebArea();
static AccessibilityObject* focusedImageMapUIElement(HTMLAreaElement*);
AXID getAXID(AccessibilityObject*);
void notificationPostTimerFired();
void liveRegionChangedNotificationPostTimerFired();
void focusAriaModalNodeTimerFired();
void postTextStateChangeNotification(AccessibilityObject*, const AXTextStateChangeIntent&, const VisibleSelection&);
bool enqueuePasswordValueChangeNotification(AccessibilityObject*);
void passwordNotificationPostTimerFired();
void handleMenuOpened(Node*);
void handleLiveRegionCreated(Node*);
void handleMenuItemSelected(Node*);
// aria-modal related
void findAriaModalNodes();
void updateCurrentAriaModalNode();
bool isNodeVisible(Node*) const;
Document& m_document;
HashMap<AXID, RefPtr<AccessibilityObject>> m_objects;
HashMap<RenderObject*, AXID> m_renderObjectMapping;
HashMap<Widget*, AXID> m_widgetObjectMapping;
HashMap<Node*, AXID> m_nodeObjectMapping;
HashSet<Node*> m_textMarkerNodes;
std::unique_ptr<AXComputedObjectAttributeCache> m_computedObjectAttributeCache;
WEBCORE_EXPORT static bool gAccessibilityEnabled;
WEBCORE_EXPORT static bool gAccessibilityEnhancedUserInterfaceEnabled;
HashSet<AXID> m_idsInUse;
Timer m_notificationPostTimer;
Vector<std::pair<RefPtr<AccessibilityObject>, AXNotification>> m_notificationsToPost;
Timer m_passwordNotificationPostTimer;
ListHashSet<RefPtr<AccessibilityObject>> m_passwordNotificationsToPost;
Timer m_liveRegionChangedPostTimer;
ListHashSet<RefPtr<AccessibilityObject>> m_liveRegionObjectsSet;
Timer m_focusAriaModalNodeTimer;
Node* m_currentAriaModalNode;
ListHashSet<Node*> m_ariaModalNodesSet;
AXTextStateChangeIntent m_textSelectionIntent;
ListHashSet<Element*> m_deferredRecomputeIsIgnoredList;
ListHashSet<Node*> m_deferredTextChangedList;
bool m_isSynchronizingSelection { false };
bool m_performingDeferredCacheUpdate { false };
};
class AXAttributeCacheEnabler
{
public:
explicit AXAttributeCacheEnabler(AXObjectCache *cache);
~AXAttributeCacheEnabler();
#if HAVE(ACCESSIBILITY)
private:
AXObjectCache* m_cache;
#endif
};
bool nodeHasRole(Node*, const String& role);
// This will let you know if aria-hidden was explicitly set to false.
bool isNodeAriaVisible(Node*);
#if !HAVE(ACCESSIBILITY)
inline AccessibilityObjectInclusion AXComputedObjectAttributeCache::getIgnored(AXID) const { return DefaultBehavior; }
inline AccessibilityReplacedText::AccessibilityReplacedText(const VisibleSelection&) { }
inline void AccessibilityReplacedText::postTextStateChangeNotification(AXObjectCache*, AXTextEditType, const String&, const VisibleSelection&) { }
inline void AXComputedObjectAttributeCache::setIgnored(AXID, AccessibilityObjectInclusion) { }
inline AXObjectCache::AXObjectCache(Document& document) : m_document(document), m_notificationPostTimer(*this, &AXObjectCache::notificationPostTimerFired), m_passwordNotificationPostTimer(*this, &AXObjectCache::passwordNotificationPostTimerFired), m_liveRegionChangedPostTimer(*this, &AXObjectCache::liveRegionChangedNotificationPostTimerFired), m_focusAriaModalNodeTimer(*this, &AXObjectCache::focusAriaModalNodeTimerFired) { }
inline AXObjectCache::~AXObjectCache() { }
inline AccessibilityObject* AXObjectCache::focusedUIElementForPage(const Page*) { return nullptr; }
inline AccessibilityObject* AXObjectCache::get(RenderObject*) { return nullptr; }
inline AccessibilityObject* AXObjectCache::get(Node*) { return nullptr; }
inline AccessibilityObject* AXObjectCache::get(Widget*) { return nullptr; }
inline AccessibilityObject* AXObjectCache::getOrCreate(RenderObject*) { return nullptr; }
inline AccessibilityObject* AXObjectCache::getOrCreate(AccessibilityRole) { return nullptr; }
inline AccessibilityObject* AXObjectCache::getOrCreate(Node*) { return nullptr; }
inline AccessibilityObject* AXObjectCache::getOrCreate(Widget*) { return nullptr; }
inline AccessibilityObject* AXObjectCache::rootObject() { return nullptr; }
inline AccessibilityObject* AXObjectCache::rootObjectForFrame(Frame*) { return nullptr; }
inline bool nodeHasRole(Node*, const String&) { return false; }
inline void AXObjectCache::startCachingComputedObjectAttributesUntilTreeMutates() { }
inline void AXObjectCache::stopCachingComputedObjectAttributes() { }
inline bool isNodeAriaVisible(Node*) { return true; }
inline const Element* AXObjectCache::rootAXEditableElement(const Node*) { return nullptr; }
inline Node* AXObjectCache::ariaModalNode() { return nullptr; }
inline void AXObjectCache::attachWrapper(AccessibilityObject*) { }
inline void AXObjectCache::checkedStateChanged(Node*) { }
inline void AXObjectCache::childrenChanged(AccessibilityObject*) { }
inline void AXObjectCache::childrenChanged(Node*, Node*) { }
inline void AXObjectCache::childrenChanged(RenderObject*, RenderObject*) { }
inline void AXObjectCache::deferRecomputeIsIgnored(Element*) { }
inline void AXObjectCache::deferTextChangedIfNeeded(Node*) { }
inline void AXObjectCache::detachWrapper(AccessibilityObject*, AccessibilityDetachmentType) { }
inline void AXObjectCache::focusAriaModalNodeTimerFired() { }
inline void AXObjectCache::frameLoadingEventNotification(Frame*, AXLoadingEvent) { }
inline void AXObjectCache::frameLoadingEventPlatformNotification(AccessibilityObject*, AXLoadingEvent) { }
inline void AXObjectCache::handleActiveDescendantChanged(Node*) { }
inline void AXObjectCache::handleAriaExpandedChange(Node*) { }
inline void AXObjectCache::handleAriaModalChange(Node*) { }
inline void AXObjectCache::handleAriaRoleChanged(Node*) { }
inline void AXObjectCache::handleAttributeChanged(const QualifiedName&, Element*) { }
inline void AXObjectCache::handleFocusedUIElementChanged(Node*, Node*) { }
inline void AXObjectCache::handleScrollbarUpdate(ScrollView*) { }
inline void AXObjectCache::handleScrolledToAnchor(const Node*) { }
inline void AXObjectCache::liveRegionChangedNotificationPostTimerFired() { }
inline void AXObjectCache::notificationPostTimerFired() { }
inline void AXObjectCache::passwordNotificationPostTimerFired() { }
inline void AXObjectCache::performDeferredCacheUpdate() { }
inline void AXObjectCache::postLiveRegionChangeNotification(AccessibilityObject*) { }
inline void AXObjectCache::postNotification(AccessibilityObject*, Document*, AXNotification, PostTarget, PostType) { }
inline void AXObjectCache::postNotification(Node*, AXNotification, PostTarget, PostType) { }
inline void AXObjectCache::postNotification(RenderObject*, AXNotification, PostTarget, PostType) { }
inline void AXObjectCache::postPlatformNotification(AccessibilityObject*, AXNotification) { }
inline void AXObjectCache::postTextReplacementNotification(Node*, AXTextEditType, const String&, AXTextEditType, const String&, const VisiblePosition&) { }
inline void AXObjectCache::postTextReplacementNotificationForTextControl(HTMLTextFormControlElement&, const String&, const String&) { }
inline void AXObjectCache::postTextStateChangeNotification(Node*, AXTextEditType, const String&, const VisiblePosition&) { }
inline void AXObjectCache::postTextStateChangeNotification(Node*, const AXTextStateChangeIntent&, const VisibleSelection&) { }
inline void AXObjectCache::recomputeIsIgnored(RenderObject*) { }
inline void AXObjectCache::textChanged(AccessibilityObject*) { }
inline void AXObjectCache::textChanged(Node*) { }
inline void AXObjectCache::updateCacheAfterNodeIsAttached(Node*) { }
inline RefPtr<Range> AXObjectCache::rangeForNodeContents(Node*) { return nullptr; }
inline void AXObjectCache::remove(AXID) { }
inline void AXObjectCache::remove(RenderObject*) { }
inline void AXObjectCache::remove(Node*) { }
inline void AXObjectCache::remove(Widget*) { }
inline void AXObjectCache::selectedChildrenChanged(RenderObject*) { }
inline void AXObjectCache::selectedChildrenChanged(Node*) { }
inline void AXObjectCache::setIsSynchronizingSelection(bool) { }
inline void AXObjectCache::setTextSelectionIntent(const AXTextStateChangeIntent&) { }
inline RefPtr<Range> AXObjectCache::rangeForUnorderedCharacterOffsets(const CharacterOffset&, const CharacterOffset&) { return nullptr; }
inline IntRect AXObjectCache::absoluteCaretBoundsForCharacterOffset(const CharacterOffset&) { return IntRect(); }
inline CharacterOffset AXObjectCache::characterOffsetForIndex(int, const AccessibilityObject*) { return CharacterOffset(); }
inline CharacterOffset AXObjectCache::startOrEndCharacterOffsetForRange(RefPtr<Range>, bool, bool) { return CharacterOffset(); }
inline CharacterOffset AXObjectCache::endCharacterOffsetOfLine(const CharacterOffset&) { return CharacterOffset(); }
inline CharacterOffset AXObjectCache::nextCharacterOffset(const CharacterOffset&, bool) { return CharacterOffset(); }
inline CharacterOffset AXObjectCache::previousCharacterOffset(const CharacterOffset&, bool) { return CharacterOffset(); }
#if PLATFORM(COCOA)
inline void AXObjectCache::postTextStateChangePlatformNotification(AccessibilityObject*, const AXTextStateChangeIntent&, const VisibleSelection&) { }
inline void AXObjectCache::postTextStateChangePlatformNotification(AccessibilityObject*, AXTextEditType, const String&, const VisiblePosition&) { }
inline void AXObjectCache::postTextReplacementPlatformNotification(AccessibilityObject*, AXTextEditType, const String&, AXTextEditType, const String&, const VisiblePosition&) { }
#else
inline AXTextChange AXObjectCache::textChangeForEditType(AXTextEditType) { return AXTextInserted; }
inline void AXObjectCache::nodeTextChangePlatformNotification(AccessibilityObject*, AXTextChange, unsigned, const String&) { }
#endif
inline AXAttributeCacheEnabler::AXAttributeCacheEnabler(AXObjectCache*) { }
inline AXAttributeCacheEnabler::~AXAttributeCacheEnabler() { }
#endif
} // namespace WebCore