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/*
* Copyright (C) 2014, Google 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.
* 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 AXObjectCacheImpl_h
#define AXObjectCacheImpl_h
#include "core/dom/AXObjectCache.h"
#include "core/rendering/RenderText.h"
#include "modules/accessibility/AXObject.h"
#include "platform/Timer.h"
#include "wtf/Forward.h"
#include "wtf/HashMap.h"
#include "wtf/HashSet.h"
#include "wtf/RefPtr.h"
namespace blink {
class AbstractInlineTextBox;
class HTMLAreaElement;
class FrameView;
class Widget;
struct TextMarkerData {
AXID axID;
Node* node;
int offset;
EAffinity affinity;
};
// This class should only be used from inside the accessibility directory.
class AXObjectCacheImpl : public AXObjectCache {
WTF_MAKE_NONCOPYABLE(AXObjectCacheImpl); WTF_MAKE_FAST_ALLOCATED;
public:
explicit AXObjectCacheImpl(Document&);
~AXObjectCacheImpl();
AXObject* focusedUIElementForPage(const Page*);
virtual void selectionChanged(Node*) override;
virtual void childrenChanged(Node*) override;
virtual void childrenChanged(RenderObject*) override;
virtual void checkedStateChanged(Node*) override;
virtual void selectedChildrenChanged(Node*) override;
virtual void remove(RenderObject*) override;
virtual void remove(Node*) override;
virtual void remove(Widget*) override;
virtual const Element* rootAXEditableElement(const Node*) override;
// Called by a node when text or a text equivalent (e.g. alt) attribute is changed.
virtual void textChanged(RenderObject*) override;
// Called when a node has just been attached, so we can make sure we have the right subclass of AXObject.
virtual void updateCacheAfterNodeIsAttached(Node*) override;
virtual void handleAttributeChanged(const QualifiedName& attrName, Element*) override;
virtual void handleFocusedUIElementChanged(Node* oldFocusedNode, Node* newFocusedNode) override;
virtual void handleInitialFocus() override;
virtual void handleTextFormControlChanged(Node*) override;
virtual void handleEditableTextContentChanged(Node*) override;
virtual void handleValueChanged(Node*) override;
virtual void handleUpdateActiveMenuOption(RenderMenuList*, int optionIndex) override;
virtual void handleLoadComplete(Document*) override;
virtual void handleLayoutComplete(Document*) override;
virtual void setCanvasObjectBounds(Element*, const LayoutRect&) override;
virtual void clearWeakMembers(Visitor*) override;
virtual void inlineTextBoxesUpdated(RenderObject* renderer) override;
// Called when the scroll offset changes.
virtual void handleScrollPositionChanged(FrameView*) override;
virtual void handleScrollPositionChanged(RenderObject*) override;
// Called when scroll bars are added / removed (as the view resizes).
void handleScrollbarUpdate(FrameView*) override;
void handleLayoutComplete(RenderObject*) override;
void handleScrolledToAnchor(const Node* anchorNode) override;
virtual const AtomicString& computedRoleForNode(Node*) override;
virtual String computedNameForNode(Node*) override;
// Returns the root object for the entire document.
AXObject* rootObject();
AXObject* objectFromAXID(AXID id) const { return m_objects.get(id); }
AXObject* root();
// used for objects without backing elements
AXObject* getOrCreate(AccessibilityRole);
AXObject* getOrCreate(RenderObject*);
AXObject* getOrCreate(Widget*);
AXObject* getOrCreate(Node*);
AXObject* getOrCreate(AbstractInlineTextBox*);
// will only return the AXObject if it already exists
AXObject* get(Node*);
AXObject* get(RenderObject*);
AXObject* get(Widget*);
AXObject* get(AbstractInlineTextBox*);
AXObject* firstAccessibleObjectFromNode(const Node*);
void remove(AXID);
void remove(AbstractInlineTextBox*);
void childrenChanged(AXObject*);
void selectedChildrenChanged(RenderObject*);
void handleActiveDescendantChanged(Node*);
void handleAriaRoleChanged(Node*);
void handleAriaExpandedChange(Node*);
void recomputeIsIgnored(RenderObject* renderer);
bool accessibilityEnabled();
bool inlineTextBoxAccessibilityEnabled();
void removeAXID(AXObject*);
bool isIDinUse(AXID id) const { return m_idsInUse.contains(id); }
AXID platformGenerateAXID() const;
// Counts the number of times the document has been modified. Some attribute values are cached
// as long as the modification count hasn't changed.
int modificationCount() const { return m_modificationCount; }
void postNotification(RenderObject*, AXNotification, bool postToElement);
void postNotification(Node*, AXNotification, bool postToElement);
void postNotification(AXObject*, Document*, AXNotification, bool postToElement);
protected:
void postPlatformNotification(AXObject*, AXNotification);
void textChanged(AXObject*);
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); }
PassRefPtr<AXObject> createFromRenderer(RenderObject*);
PassRefPtr<AXObject> createFromNode(Node*);
PassRefPtr<AXObject> createFromInlineTextBox(AbstractInlineTextBox*);
private:
Document& m_document;
HashMap<AXID, RefPtr<AXObject> > m_objects;
HashMap<RenderObject*, AXID> m_renderObjectMapping;
HashMap<Widget*, AXID> m_widgetObjectMapping;
HashMap<Node*, AXID> m_nodeObjectMapping;
HashMap<AbstractInlineTextBox*, AXID> m_inlineTextBoxObjectMapping;
HashSet<Node*> m_textMarkerNodes;
int m_modificationCount;
HashSet<AXID> m_idsInUse;
Timer<AXObjectCacheImpl> m_notificationPostTimer;
Vector<pair<RefPtr<AXObject>, AXNotification> > m_notificationsToPost;
void notificationPostTimerFired(Timer<AXObjectCacheImpl>*);
AXObject* focusedImageMapUIElement(HTMLAreaElement*);
AXID getAXID(AXObject*);
void textChanged(Node*);
bool nodeIsTextControl(const Node*);
Settings* settings();
};
// This is the only subclass of AXObjectCache.
DEFINE_TYPE_CASTS(AXObjectCacheImpl, AXObjectCache, cache, true, true);
bool nodeHasRole(Node*, const String& role);
// This will let you know if aria-hidden was explicitly set to false.
bool isNodeAriaVisible(Node*);
}
#endif
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