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 COMPUTER, 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 COMPUTER, 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 "platform/geometry/IntPoint.h" 30#include "wtf/PassOwnPtr.h" 31 32namespace blink { 33 34class LocalFrame; 35class FrameView; 36class Node; 37class Page; 38class PlatformMouseEvent; 39class RenderBox; 40class RenderObject; 41 42enum AutoscrollType { 43 NoAutoscroll, 44 AutoscrollForDragAndDrop, 45 AutoscrollForSelection, 46#if OS(WIN) 47 AutoscrollForPanCanStop, 48 AutoscrollForPan, 49#endif 50}; 51 52// AutscrollController handels autoscroll and pan scroll for EventHandler. 53class AutoscrollController { 54public: 55 static PassOwnPtr<AutoscrollController> create(Page&); 56 57 void animate(double monotonicFrameBeginTime); 58 bool autoscrollInProgress() const; 59 bool autoscrollInProgress(const RenderBox*) const; 60 bool panScrollInProgress() const; 61 void startAutoscrollForSelection(RenderObject*); 62 void stopAutoscroll(); 63 void stopAutoscrollIfNeeded(RenderObject*); 64 void updateAutoscrollRenderer(); 65 void updateDragAndDrop(Node* targetNode, const IntPoint& eventPosition, double eventTime); 66#if OS(WIN) 67 void handleMouseReleaseForPanScrolling(LocalFrame*, const PlatformMouseEvent&); 68 void startPanScrolling(RenderBox*, const IntPoint&); 69#endif 70 71private: 72 explicit AutoscrollController(Page&); 73 74 void startAutoscroll(); 75 76#if OS(WIN) 77 void updatePanScrollState(FrameView*, const IntPoint& lastKnownMousePosition); 78#endif 79 80 Page& m_page; 81 RenderBox* m_autoscrollRenderer; 82 AutoscrollType m_autoscrollType; 83 IntPoint m_dragAndDropAutoscrollReferencePosition; 84 double m_dragAndDropAutoscrollStartTime; 85#if OS(WIN) 86 IntPoint m_panScrollStartPos; 87#endif 88}; 89 90} // namespace blink 91 92#endif // AutoscrollController_h 93