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/*
* Copyright (C) 2003, 2006, 2007, 2008, 2009, 2010, 2011 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 COMPUTER, 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 COMPUTER, 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.
*/
#ifndef AXObjectCache_h
#define AXObjectCache_h
#include "AccessibilityObject.h"
#include "Timer.h"
#include <limits.h>
#include <wtf/Forward.h>
#include <wtf/HashMap.h>
#include <wtf/HashSet.h>
#include <wtf/RefPtr.h>
namespace WebCore {
class Document;
class HTMLAreaElement;
class Node;
class Page;
class RenderObject;
class ScrollView;
class VisiblePosition;
class Widget;
struct TextMarkerData {
AXID axID;
Node* node;
int offset;
EAffinity affinity;
};
enum PostType { PostSynchronously, PostAsynchronously };
class AXObjectCache {
WTF_MAKE_NONCOPYABLE(AXObjectCache); WTF_MAKE_FAST_ALLOCATED;
public:
AXObjectCache(const Document*);
~AXObjectCache();
static AccessibilityObject* focusedUIElementForPage(const Page*);
// Returns the root object for the entire document.
AccessibilityObject* rootObject();
// Returns the root object for a specific frame.
AccessibilityObject* rootObjectForFrame(Frame*);
// For AX objects with elements that back them.
AccessibilityObject* getOrCreate(RenderObject*);
AccessibilityObject* getOrCreate(Widget*);
// used for objects without backing elements
AccessibilityObject* getOrCreate(AccessibilityRole);
// will only return the AccessibilityObject if it already exists
AccessibilityObject* get(RenderObject*);
void remove(RenderObject*);
void remove(Widget*);
void remove(AXID);
void detachWrapper(AccessibilityObject*);
void attachWrapper(AccessibilityObject*);
void childrenChanged(RenderObject*);
void selectedChildrenChanged(RenderObject*);
// Called by a node when text or a text equivalent (e.g. alt) attribute is changed.
void contentChanged(RenderObject*);
void handleActiveDescendantChanged(RenderObject*);
void handleAriaRoleChanged(RenderObject*);
void handleFocusedUIElementChanged(RenderObject* oldFocusedRenderer, RenderObject* newFocusedRenderer);
void handleScrolledToAnchor(const Node* anchorNode);
void handleAriaExpandedChange(RenderObject*);
void handleScrollbarUpdate(ScrollView*);
static void enableAccessibility() { gAccessibilityEnabled = true; }
// Enhanced user interface accessibility can be toggled by the assistive technology.
static void setEnhancedUserInterfaceAccessibility(bool flag) { gAccessibilityEnhancedUserInterfaceEnabled = flag; }
static bool accessibilityEnabled() { return gAccessibilityEnabled; }
static bool accessibilityEnhancedUserInterfaceEnabled() { return gAccessibilityEnhancedUserInterfaceEnabled; }
void removeAXID(AccessibilityObject*);
bool isIDinUse(AXID id) const { return m_idsInUse.contains(id); }
AXID platformGenerateAXID() const;
AccessibilityObject* objectFromAXID(AXID id) const { return m_objects.get(id).get(); }
// 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); }
// Text marker utilities.
void textMarkerDataForVisiblePosition(TextMarkerData&, const VisiblePosition&);
VisiblePosition visiblePositionForTextMarkerData(TextMarkerData&);
enum AXNotification {
AXActiveDescendantChanged,
AXAutocorrectionOccured,
AXCheckedStateChanged,
AXChildrenChanged,
AXFocusedUIElementChanged,
AXLayoutComplete,
AXLoadComplete,
AXSelectedChildrenChanged,
AXSelectedTextChanged,
AXValueChanged,
AXScrolledToAnchor,
AXLiveRegionChanged,
AXMenuListValueChanged,
AXRowCountChanged,
AXRowCollapsed,
AXRowExpanded,
AXInvalidStatusChanged,
};
void postNotification(RenderObject*, AXNotification, bool postToElement, PostType = PostAsynchronously);
void postNotification(AccessibilityObject*, Document*, AXNotification, bool postToElement, PostType = PostAsynchronously);
enum AXTextChange {
AXTextInserted,
AXTextDeleted,
};
void nodeTextChangeNotification(RenderObject*, AXTextChange, unsigned offset, unsigned count);
bool nodeHasRole(Node*, const AtomicString& role);
protected:
void postPlatformNotification(AccessibilityObject*, AXNotification);
void nodeTextChangePlatformNotification(AccessibilityObject*, AXTextChange, unsigned offset, unsigned count);
private:
Document* m_document;
HashMap<AXID, RefPtr<AccessibilityObject> > m_objects;
HashMap<RenderObject*, AXID> m_renderObjectMapping;
HashMap<Widget*, AXID> m_widgetObjectMapping;
HashSet<Node*> m_textMarkerNodes;
static bool gAccessibilityEnabled;
static bool gAccessibilityEnhancedUserInterfaceEnabled;
HashSet<AXID> m_idsInUse;
Timer<AXObjectCache> m_notificationPostTimer;
Vector<pair<RefPtr<AccessibilityObject>, AXNotification> > m_notificationsToPost;
void notificationPostTimerFired(Timer<AXObjectCache>*);
static AccessibilityObject* focusedImageMapUIElement(HTMLAreaElement*);
AXID getAXID(AccessibilityObject*);
AccessibilityObject* get(Widget*);
};
bool nodeHasRole(Node*, const String& role);
#if !HAVE(ACCESSIBILITY)
inline void AXObjectCache::handleActiveDescendantChanged(RenderObject*) { }
inline void AXObjectCache::handleAriaRoleChanged(RenderObject*) { }
inline void AXObjectCache::detachWrapper(AccessibilityObject*) { }
inline void AXObjectCache::attachWrapper(AccessibilityObject*) { }
inline void AXObjectCache::selectedChildrenChanged(RenderObject*) { }
inline void AXObjectCache::postNotification(RenderObject*, AXNotification, bool postToElement, PostType) { }
inline void AXObjectCache::postNotification(AccessibilityObject*, Document*, AXNotification, bool postToElement, PostType) { }
inline void AXObjectCache::postPlatformNotification(AccessibilityObject*, AXNotification) { }
inline void AXObjectCache::nodeTextChangeNotification(RenderObject*, AXTextChange, unsigned, unsigned) { }
inline void AXObjectCache::nodeTextChangePlatformNotification(AccessibilityObject*, AXTextChange, unsigned, unsigned) { }
inline void AXObjectCache::handleFocusedUIElementChanged(RenderObject*, RenderObject*) { }
inline void AXObjectCache::handleScrolledToAnchor(const Node*) { }
inline void AXObjectCache::contentChanged(RenderObject*) { }
inline void AXObjectCache::handleAriaExpandedChange(RenderObject*) { }
inline void AXObjectCache::handleScrollbarUpdate(ScrollView*) { }
#endif
}
#endif
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