/*
 * Copyright (C) 2013 Google 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 GOOGLE, 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 OverscrollTheme_h
#define OverscrollTheme_h

#include "platform/PlatformExport.h"
#include "platform/graphics/GraphicsLayer.h"
#include "platform/graphics/Image.h"

namespace WebCore {

class PLATFORM_EXPORT OverscrollTheme {
    WTF_MAKE_NONCOPYABLE(OverscrollTheme); WTF_MAKE_FAST_ALLOCATED;
public:
    OverscrollTheme();
    virtual ~OverscrollTheme() { }

    virtual PassRefPtr<Image> getOverhangImage();
    virtual void setUpOverhangShadowLayer(GraphicsLayer*);
    virtual void updateOverhangShadowLayer(GraphicsLayer* shadowLayer, GraphicsLayer* rootContentLayer);

    static OverscrollTheme* theme();

private:
    RefPtr<Image> m_overhangShadow;
    RefPtr<Image> m_overhangPattern;
};

}

#endif