/*

 * Copyright (C) 2004, 2005, 2006, 2007 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 PlatformScrollbar_h

#define PlatformScrollbar_h

#include "Widget.h"

#include "ScrollBar.h"

#include "Timer.h"

typedef struct HDC__* HDC;

namespace WebCore {

enum ScrollbarPart { NoPart, BackButtonPart, BackTrackPart, ThumbPart, ForwardTrackPart, ForwardButtonPart };

class PlatformScrollbar : public Widget, public Scrollbar {

public:

    PlatformScrollbar(ScrollbarClient*, ScrollbarOrientation, ScrollbarControlSize);

    virtual ~PlatformScrollbar();

    virtual bool isWidget() const { return true; }

    virtual void setParent(ScrollView*);

    virtual int width() const;

    virtual int height() const;

    virtual void setRect(const IntRect&);

    virtual void setEnabled(bool);

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

    virtual bool handleMouseMoveEvent(const PlatformMouseEvent&);

    virtual bool handleMouseOutEvent(const PlatformMouseEvent&);

    virtual bool handleMousePressEvent(const PlatformMouseEvent&);

    virtual bool handleMouseReleaseEvent(const PlatformMouseEvent&);

    virtual IntRect windowClipRect() const;

    static void themeChanged();

    static int horizontalScrollbarHeight(ScrollbarControlSize size = RegularScrollbar);

    static int verticalScrollbarWidth(ScrollbarControlSize size = RegularScrollbar);

    void autoscrollTimerFired(Timer<PlatformScrollbar>*);

protected:    

    virtual void updateThumbPosition();

    virtual void updateThumbProportion();

private:

    IntRect backButtonRect() const;

    IntRect forwardButtonRect() const;

    IntRect trackRect() const;

    IntRect thumbRect() const;

    IntRect gripperRect(const IntRect& thumbRect) const;    

    void splitTrack(const IntRect& trackRect, IntRect& beforeThumbRect, IntRect& thumbRect, IntRect& afterThumbRect) const;

    int thumbPosition() const;

    int thumbLength() const;

    int trackLength() const;

    void paintButton(GraphicsContext*, const IntRect& buttonRect, bool start, const IntRect& damageRect) const;

    void paintTrack(GraphicsContext*, const IntRect& trackRect, bool start, const IntRect& damageRect) const;

    void paintThumb(GraphicsContext*, const IntRect& thumbRect, const IntRect& damageRect) const;

    void paintGripper(HDC, const IntRect& gripperRect) const;

    ScrollbarPart hitTest(const PlatformMouseEvent&);

    void startTimerIfNeeded(double delay);

    void stopTimerIfNeeded();

    void autoscrollPressedPart(double delay);

    ScrollDirection pressedPartScrollDirection();

    ScrollGranularity pressedPartScrollGranularity();

    bool thumbUnderMouse();

    void invalidatePart(ScrollbarPart);

    void invalidateTrack();

    ScrollbarPart m_hoveredPart;

    ScrollbarPart m_pressedPart;

    int m_pressedPos;

    Timer<PlatformScrollbar> m_scrollTimer;

    bool m_overlapsResizer;

};

}

#endif // PlatformScrollbar_h