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      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 
     32 namespace blink {
     33 
     34 class LocalFrame;
     35 class FrameView;
     36 class Node;
     37 class Page;
     38 class PlatformMouseEvent;
     39 class RenderBox;
     40 class RenderObject;
     41 
     42 enum 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.
     53 class AutoscrollController {
     54 public:
     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 
     71 private:
     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