1/* 2 * Copyright (C) 2006, 2007, 2009, 2010, 2011 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#ifndef AutoscrollController_h 27#define AutoscrollController_h 28 29#include "IntPoint.h" 30#include "Timer.h" 31 32namespace WebCore { 33 34class EventHandler; 35class Frame; 36class FrameView; 37class Node; 38class PlatformMouseEvent; 39class RenderBox; 40class RenderObject; 41 42enum AutoscrollType { 43 NoAutoscroll, 44 AutoscrollForDragAndDrop, 45 AutoscrollForSelection, 46#if ENABLE(PAN_SCROLLING) 47 AutoscrollForPanCanStop, 48 AutoscrollForPan, 49#endif 50}; 51 52// AutscrollController handels autoscroll and pan scroll for EventHandler. 53class AutoscrollController { 54public: 55 AutoscrollController(); 56 RenderBox* autoscrollRenderer() const; 57 bool autoscrollInProgress() const; 58 bool panScrollInProgress() const; 59 void startAutoscrollForSelection(RenderObject*); 60 void stopAutoscrollTimer(bool rendererIsBeingDestroyed = false); 61 void updateAutoscrollRenderer(); 62 void updateDragAndDrop(Node* targetNode, const IntPoint& eventPosition, double eventTime); 63#if ENABLE(PAN_SCROLLING) 64 void didPanScrollStart(); 65 void didPanScrollStop(); 66 void handleMouseReleaseEvent(const PlatformMouseEvent&); 67 void setPanScrollInProgress(bool); 68 void startPanScrolling(RenderBox*, const IntPoint&); 69#endif 70 71private: 72 void autoscrollTimerFired(Timer<AutoscrollController>&); 73 void startAutoscrollTimer(); 74#if ENABLE(PAN_SCROLLING) 75 void updatePanScrollState(FrameView*, const IntPoint&); 76#endif 77 78 Timer<AutoscrollController> m_autoscrollTimer; 79 RenderBox* m_autoscrollRenderer; 80 AutoscrollType m_autoscrollType; 81 IntPoint m_dragAndDropAutoscrollReferencePosition; 82 double m_dragAndDropAutoscrollStartTime; 83#if ENABLE(PAN_SCROLLING) 84 IntPoint m_panScrollStartPos; 85#endif 86}; 87 88} // namespace WebCore 89 90#endif // AutoscrollController_h 91