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 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 */

#ifndef FramelessScrollView_h
#define FramelessScrollView_h

#include "platform/PlatformExport.h"
#include "platform/scroll/ScrollView.h"

namespace blink {

class FramelessScrollViewClient;
class PlatformGestureEvent;
class PlatformKeyboardEvent;
class PlatformMouseEvent;
class PlatformTouchEvent;
class PlatformWheelEvent;

// A FramelessScrollView is a ScrollView that can be used to render custom
// content, which does not have an associated LocalFrame.
//
// NOTE: It may be better to just develop a custom subclass of Widget that
// can have scroll bars for this instead of trying to reuse ScrollView.
//
class PLATFORM_EXPORT FramelessScrollView : public ScrollView {
public:
    FramelessScrollView() : m_client(0) { }
    virtual ~FramelessScrollView();

    FramelessScrollViewClient* client() const { return m_client; }
    void setClient(FramelessScrollViewClient* client) { m_client = client; }

    // Event handlers that subclasses must implement.
    virtual bool handleMouseDownEvent(const PlatformMouseEvent&) = 0;
    virtual bool handleMouseMoveEvent(const PlatformMouseEvent&) = 0;
    virtual bool handleMouseReleaseEvent(const PlatformMouseEvent&) = 0;
    virtual bool handleWheelEvent(const PlatformWheelEvent&) = 0;
    virtual bool handleKeyEvent(const PlatformKeyboardEvent&) = 0;
    virtual bool handleTouchEvent(const PlatformTouchEvent&) = 0;
    virtual bool handleGestureEvent(const PlatformGestureEvent&) = 0;

    // ScrollableArea public methods:
    virtual void invalidateScrollbarRect(Scrollbar*, const IntRect&) OVERRIDE;
    virtual bool isActive() const OVERRIDE;
    virtual bool scrollbarsCanBeActive() const OVERRIDE;
    virtual IntRect scrollableAreaBoundingBox() const OVERRIDE;

    // Widget public methods:
    virtual void invalidateRect(const IntRect&) OVERRIDE;

    // ScrollView public methods:
    virtual HostWindow* hostWindow() const OVERRIDE;
    virtual IntRect windowClipRect(IncludeScrollbarsInRect = ExcludeScrollbars) const OVERRIDE;

protected:
    // ScrollView protected methods:
    virtual void paintContents(GraphicsContext*, const IntRect&) OVERRIDE;
    virtual void contentsResized() OVERRIDE;
    virtual void scrollbarExistenceDidChange() OVERRIDE;

private:
    FramelessScrollViewClient* m_client;
};

} // namespace blink

#endif
