/*

 * 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 ScrollbarClient_h

#define ScrollbarClient_h

#include "IntRect.h"

#include "Scrollbar.h"

#include <wtf/Vector.h>

namespace WebCore {

class ScrollbarClient {

public:

    virtual ~ScrollbarClient() {}

    virtual void valueChanged(Scrollbar*) = 0;

    virtual void invalidateScrollbarRect(Scrollbar*, const IntRect&) = 0;

    virtual bool isActive() const = 0;

    virtual bool scrollbarCornerPresent() const = 0;

    virtual void getTickmarks(Vector<IntRect>&) const { }

    // Convert points and rects between the scrollbar and its containing view.

    // The client needs to implement these in order to be aware of layout effects

    // like CSS transforms.

    virtual IntRect convertFromScrollbarToContainingView(const Scrollbar* scrollbar, const IntRect& scrollbarRect) const

    {

        return scrollbar->Widget::convertToContainingView(scrollbarRect);

    }

    virtual IntRect convertFromContainingViewToScrollbar(const Scrollbar* scrollbar, const IntRect& parentRect) const

    {

        return scrollbar->Widget::convertFromContainingView(parentRect);

    }

    virtual IntPoint convertFromScrollbarToContainingView(const Scrollbar* scrollbar, const IntPoint& scrollbarPoint) const

    {

        return scrollbar->Widget::convertToContainingView(scrollbarPoint);

    }

    virtual IntPoint convertFromContainingViewToScrollbar(const Scrollbar* scrollbar, const IntPoint& parentPoint) const

    {

        return scrollbar->Widget::convertFromContainingView(parentPoint);

    }

};

}

#endif