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/*
* Copyright (C) 2008, 2009 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.
*/
#ifndef LayoutScrollbar_h
#define LayoutScrollbar_h
#include "core/style/ComputedStyleConstants.h"
#include "platform/heap/Handle.h"
#include "platform/scroll/Scrollbar.h"
#include "wtf/HashMap.h"
namespace blink {
class ComputedStyle;
class LayoutBox;
class LayoutScrollbarPart;
class LocalFrame;
class Node;
class LayoutScrollbar final : public Scrollbar {
public:
static Scrollbar* createCustomScrollbar(ScrollableArea*,
ScrollbarOrientation,
Node*,
LocalFrame* owningFrame = nullptr);
~LayoutScrollbar() override;
LayoutBox* owningLayoutObject() const;
LayoutBox* owningLayoutObjectWithinFrame() const;
IntRect buttonRect(ScrollbarPart) const;
IntRect trackRect(int startLength, int endLength) const;
IntRect trackPieceRectWithMargins(ScrollbarPart, const IntRect&) const;
int minimumThumbLength() const;
bool isOverlayScrollbar() const override { return false; }
LayoutScrollbarPart* getPart(ScrollbarPart partType) {
return m_parts.get(partType);
}
const LayoutScrollbarPart* getPart(ScrollbarPart partType) const {
return m_parts.get(partType);
}
void invalidateDisplayItemClientsOfScrollbarParts();
DECLARE_VIRTUAL_TRACE();
protected:
LayoutScrollbar(ScrollableArea*, ScrollbarOrientation, Node*, LocalFrame*);
private:
friend class Scrollbar;
void setParent(Widget*) override;
void setEnabled(bool) override;
void setHoveredPart(ScrollbarPart) override;
void setPressedPart(ScrollbarPart) override;
void styleChanged() override;
bool isCustomScrollbar() const override { return true; }
void updateScrollbarParts(bool destroy = false);
PassRefPtr<ComputedStyle> getScrollbarPseudoStyle(ScrollbarPart, PseudoId);
void updateScrollbarPart(ScrollbarPart, bool destroy = false);
// This Scrollbar(Widget) may outlive the DOM which created it (during tear
// down), so we keep a reference to the Node which caused this custom
// scrollbar creation.
// This will not create a reference cycle as the Widget tree is owned by our
// containing FrameView which this Node pointer can in no way keep alive.
// See webkit bug 80610.
Member<Node> m_owner;
Member<LocalFrame> m_owningFrame;
HashMap<unsigned, LayoutScrollbarPart*> m_parts;
};
DEFINE_TYPE_CASTS(LayoutScrollbar,
ScrollbarThemeClient,
scrollbar,
scrollbar->isCustomScrollbar(),
scrollbar.isCustomScrollbar());
} // namespace blink
#endif // LayoutScrollbar_h
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