90 lines
3.0 KiB
C++
90 lines
3.0 KiB
C++
/*
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* Copyright (C) 2006, 2007, 2009, 2010, 2011 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "IntPoint.h"
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#include "Timer.h"
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#include <wtf/WallTime.h>
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namespace WebCore {
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class EventHandler;
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class Frame;
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class FrameView;
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class Node;
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class PlatformMouseEvent;
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class RenderBox;
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class RenderObject;
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enum AutoscrollType {
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NoAutoscroll,
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AutoscrollForDragAndDrop,
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AutoscrollForSelection,
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#if ENABLE(PAN_SCROLLING)
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AutoscrollForPanCanStop,
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AutoscrollForPan,
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#endif
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};
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// AutscrollController handles autoscroll and pan scroll for EventHandler.
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class AutoscrollController {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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AutoscrollController();
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RenderBox* autoscrollRenderer() const;
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bool autoscrollInProgress() const;
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bool panScrollInProgress() const;
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void startAutoscrollForSelection(RenderObject*);
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void stopAutoscrollTimer(bool rendererIsBeingDestroyed = false);
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void updateAutoscrollRenderer();
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void updateDragAndDrop(Node* targetNode, const IntPoint& eventPosition, WallTime eventTime);
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#if ENABLE(PAN_SCROLLING)
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void didPanScrollStart();
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void didPanScrollStop();
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void handleMouseReleaseEvent(const PlatformMouseEvent&);
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void setPanScrollInProgress(bool);
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void startPanScrolling(RenderBox*, const IntPoint&);
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#endif
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private:
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void autoscrollTimerFired();
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void startAutoscrollTimer();
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#if ENABLE(PAN_SCROLLING)
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void updatePanScrollState(FrameView*, const IntPoint&);
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#endif
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Timer m_autoscrollTimer;
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RenderBox* m_autoscrollRenderer;
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AutoscrollType m_autoscrollType;
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IntPoint m_dragAndDropAutoscrollReferencePosition;
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WallTime m_dragAndDropAutoscrollStartTime;
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#if ENABLE(PAN_SCROLLING)
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IntPoint m_panScrollStartPos;
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#endif
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};
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} // namespace WebCore
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