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/*
* Copyright (C) 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 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 AXScrollView_h
#define AXScrollView_h
#include "modules/accessibility/AXObject.h"
namespace blink {
class AXObjectCacheImpl;
class AXScrollbar;
class Scrollbar;
class FrameView;
class AXScrollView final : public AXObject {
public:
static PassRefPtr<AXScrollView> create(FrameView*, AXObjectCacheImpl*);
virtual AccessibilityRole roleValue() const override { return ScrollAreaRole; }
FrameView* scrollView() const { return m_scrollView; }
virtual ~AXScrollView();
virtual void detach() override;
protected:
virtual ScrollableArea* getScrollableAreaIfScrollable() const override;
virtual void scrollTo(const IntPoint&) const override;
private:
AXScrollView(FrameView*, AXObjectCacheImpl*);
virtual bool computeAccessibilityIsIgnored() const override;
virtual bool isAXScrollView() const override { return true; }
virtual bool isEnabled() const override { return true; }
virtual bool isAttachment() const override;
virtual Widget* widgetForAttachmentView() const override;
virtual AXObject* scrollBar(AccessibilityOrientation) override;
virtual void addChildren() override;
virtual void clearChildren() override;
virtual AXObject* accessibilityHitTest(const IntPoint&) const override;
virtual void updateChildrenIfNecessary() override;
virtual void setNeedsToUpdateChildren() override { m_childrenDirty = true; }
void updateScrollbars();
virtual FrameView* documentFrameView() const override;
virtual LayoutRect elementRect() const override;
virtual AXObject* computeParent() const override;
virtual AXObject* computeParentIfExists() const override;
AXObject* webAreaObject() const;
virtual AXObject* firstChild() const override { return webAreaObject(); }
AXScrollbar* addChildScrollbar(Scrollbar*);
void removeChildScrollbar(AXObject*);
// FIXME: Oilpan: Frame/ScrollView is on the heap and its
// AXScrollView is detached&removed from the AX cache when the
// FrameView is disposed. Which clears m_scrollView, hence this
// bare pointer will not be stale, so the bare pointer use is safe
// & acceptable.
//
// However, it would be preferable to have it be normally traced
// as part of moving the AX objects to the heap. Temporarily using
// a Persistent risks creating a FrameView leak, and brings no
// real benefits overall.
FrameView* m_scrollView;
RefPtr<AXObject> m_horizontalScrollbar;
RefPtr<AXObject> m_verticalScrollbar;
bool m_childrenDirty;
};
DEFINE_AX_OBJECT_TYPE_CASTS(AXScrollView, isAXScrollView());
} // namespace blink
#endif // AXScrollView_h
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