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/*
* Copyright (C) 2006, 2007, 2009, 2010, 2011 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 AutoscrollController_h
#define AutoscrollController_h
#include "core/CoreExport.h"
#include "platform/geometry/FloatSize.h"
#include "platform/geometry/IntPoint.h"
#include "platform/heap/Handle.h"
#include "wtf/Time.h"
namespace blink {
class LocalFrame;
class FrameView;
class Node;
class Page;
class PlatformMouseEvent;
class LayoutBox;
class LayoutObject;
enum AutoscrollType {
NoAutoscroll,
AutoscrollForDragAndDrop,
AutoscrollForSelection,
AutoscrollForMiddleClickCanStop,
AutoscrollForMiddleClick,
};
// AutscrollController handels autoscroll and middle click autoscroll for
// EventHandler.
class CORE_EXPORT AutoscrollController final
: public GarbageCollected<AutoscrollController> {
public:
static AutoscrollController* create(Page&);
DECLARE_TRACE();
static const int noMiddleClickAutoscrollRadius = 15;
void animate(double monotonicFrameBeginTime);
bool autoscrollInProgress() const;
bool autoscrollInProgress(const LayoutBox*) const;
bool middleClickAutoscrollInProgress() const;
void startAutoscrollForSelection(LayoutObject*);
void stopAutoscroll();
void stopAutoscrollIfNeeded(LayoutObject*);
void updateAutoscrollLayoutObject();
void updateDragAndDrop(Node* targetNode,
const IntPoint& eventPosition,
TimeTicks eventTime);
void handleMouseReleaseForMiddleClickAutoscroll(LocalFrame*,
const PlatformMouseEvent&);
void startMiddleClickAutoscroll(LayoutBox*, const IntPoint&);
private:
explicit AutoscrollController(Page&);
void startAutoscroll();
void updateMiddleClickAutoscrollState(FrameView*,
const IntPoint& lastKnownMousePosition);
FloatSize calculateAutoscrollDelta();
Member<Page> m_page;
LayoutBox* m_autoscrollLayoutObject;
LayoutBox* m_pressedLayoutObject;
AutoscrollType m_autoscrollType;
IntPoint m_dragAndDropAutoscrollReferencePosition;
TimeTicks m_dragAndDropAutoscrollStartTime;
IntPoint m_middleClickAutoscrollStartPos;
bool m_didLatchForMiddleClickAutoscroll;
};
} // namespace blink
#endif // AutoscrollController_h
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