1/*
2 * Copyright (C) 2016 Igalia S.L.
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. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#include "FloatPoint.h"
29#include "ScrollAnimation.h"
30#include "Timer.h"
31
32#include <wtf/Optional.h>
33
34namespace WebCore {
35
36class ScrollableArea;
37
38class ScrollAnimationKinetic final: public ScrollAnimation {
39private:
40 class PerAxisData {
41 public:
42 PerAxisData(double lower, double upper, double initialPosition, double initialVelocity);
43
44 double position() { return m_position; }
45
46 bool animateScroll(Seconds timeDelta);
47
48 private:
49 double m_lower { 0 };
50 double m_upper { 0 };
51
52 double m_coef1 { 0 };
53 double m_coef2 { 0 };
54
55 Seconds m_elapsedTime;
56 double m_position { 0 };
57 double m_velocity { 0 };
58 };
59
60public:
61 ScrollAnimationKinetic(ScrollableArea&, std::function<void(FloatPoint&&)>&& notifyPositionChangedFunction);
62 virtual ~ScrollAnimationKinetic();
63
64 void start(const FloatPoint& initialPosition, const FloatPoint& velocity, bool mayHScroll, bool mayVScroll);
65
66private:
67 void stop() override;
68 void animationTimerFired();
69
70 std::function<void(FloatPoint&&)> m_notifyPositionChangedFunction;
71
72 Optional<PerAxisData> m_horizontalData;
73 Optional<PerAxisData> m_verticalData;
74
75 MonotonicTime m_startTime;
76 Timer m_animationTimer;
77 FloatPoint m_position;
78};
79
80} // namespace WebCore
81