1 /*
2  * Copyright (c) 2010, Google 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 are
6  * met:
7  *
8  *     * Redistributions of source code must retain the above copyright
9  * notice, this list of conditions and the following disclaimer.
10  *     * Redistributions in binary form must reproduce the above
11  * copyright notice, this list of conditions and the following disclaimer
12  * in the documentation and/or other materials provided with the
13  * distribution.
14  *     * Neither the name of Google Inc. nor the names of its
15  * contributors may be used to endorse or promote products derived from
16  * this software without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29  */
30 
31 #ifndef ScrollAnimatorWin_h
32 #define ScrollAnimatorWin_h
33 
34 #if ENABLE(SMOOTH_SCROLLING)
35 
36 #include "ScrollAnimator.h"
37 #include "Timer.h"
38 
39 namespace WebCore {
40 
41 class ScrollAnimatorWin : public ScrollAnimator {
42 public:
43     ScrollAnimatorWin(ScrollableArea*);
44     virtual ~ScrollAnimatorWin();
45 
46     virtual bool scroll(ScrollbarOrientation, ScrollGranularity, float step, float multiplier);
47     virtual void scrollToOffsetWithoutAnimation(const FloatPoint&);
48 
49 private:
50     struct PerAxisData {
51         PerAxisData(ScrollAnimatorWin* parent, float* currentPos);
52 
53         float* m_currentPos;
54         float m_desiredPos;
55         float m_currentVelocity;
56         float m_desiredVelocity;
57         double m_lastAnimationTime;
58         Timer<ScrollAnimatorWin> m_animationTimer;
59     };
60 
61     static double accelerationTime();
62     static const double animationTimerDelay;
63 
64     void animationTimerFired(Timer<ScrollAnimatorWin>*);
65     void stopAnimationTimerIfNeeded(PerAxisData*);
66     void animateScroll(PerAxisData*);
67 
68     PerAxisData m_horizontalData;
69     PerAxisData m_verticalData;
70 };
71 
72 } // namespace WebCore
73 
74 #endif // ENABLE(SMOOTH_SCROLLING)
75 
76 #endif // ScrollAnimatorWin_h
77