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
39namespace WebCore {
40
41class ScrollAnimatorWin : public ScrollAnimator {
42public:
43    ScrollAnimatorWin(ScrollableArea*);
44    virtual ~ScrollAnimatorWin();
45
46    virtual bool scroll(ScrollbarOrientation, ScrollGranularity, float step, float multiplier);
47    virtual void scrollToOffsetWithoutAnimation(const FloatPoint&);
48
49private:
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