renderscrollbar.h

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 * Copyright (C) 2008 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 RenderScrollbar_h
#define RenderScrollbar_h

#include "RenderStyleConstants.h"
#include "Scrollbar.h"
#include <wtf/HashMap.h>

namespace WebCore {

class RenderBox;
class RenderStyle;
class RenderScrollbarPart;
class RenderStyle;

class RenderScrollbar : public Scrollbar {
protected:
    RenderScrollbar(ScrollbarClient*, ScrollbarOrientation, RenderBox*);

public:
    friend class Scrollbar;
    static PassRefPtr<Scrollbar> createCustomScrollbar(ScrollbarClient*, ScrollbarOrientation, RenderBox*);
    virtual ~RenderScrollbar();

    virtual void setParent(ScrollView*);
    virtual void setEnabled(bool);

    virtual void paint(GraphicsContext*, const IntRect& damageRect);

    virtual void setHoveredPart(ScrollbarPart);
    virtual void setPressedPart(ScrollbarPart);

    void updateScrollbarParts(bool destroy = false);

    static ScrollbarPart partForStyleResolve();
    static RenderScrollbar* scrollbarForStyleResolve();

    virtual void styleChanged();

    RenderBox* owningRenderer() const { return m_owner; }

    void paintPart(GraphicsContext*, ScrollbarPart, const IntRect&);

    IntRect buttonRect(ScrollbarPart);
    IntRect trackRect(int startLength, int endLength);
    IntRect trackPieceRectWithMargins(ScrollbarPart, const IntRect&);

    int minimumThumbLength();

private:
    PassRefPtr<RenderStyle> getScrollbarPseudoStyle(ScrollbarPart, PseudoId);
    void updateScrollbarPart(ScrollbarPart, bool destroy = false);

    RenderBox* m_owner;
    HashMap<unsigned, RenderScrollbarPart*> m_parts;
};

} // namespace WebCore

#endif // RenderScrollbar_h