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 "ScrollAnimation.h"
29
30#if ENABLE(SMOOTH_SCROLLING)
31
32#include "Timer.h"
33
34namespace WebCore {
35
36class FloatPoint;
37class ScrollableArea;
38
39class ScrollAnimationSmooth final: public ScrollAnimation {
40public:
41 ScrollAnimationSmooth(ScrollableArea&, const FloatPoint&, WTF::Function<void (FloatPoint&&)>&& notifyPositionChangedFunction);
42 virtual ~ScrollAnimationSmooth();
43
44 enum class Curve {
45 Linear,
46 Quadratic,
47 Cubic,
48 Quartic,
49 Bounce
50 };
51
52private:
53 bool scroll(ScrollbarOrientation, ScrollGranularity, float step, float multiplier) override;
54 void stop() override;
55 void updateVisibleLengths() override;
56 void setCurrentPosition(const FloatPoint&) override;
57
58 struct PerAxisData {
59 PerAxisData() = delete;
60
61 PerAxisData(float position, int length)
62 : currentPosition(position)
63 , desiredPosition(position)
64 , visibleLength(length)
65 {
66 }
67
68 float currentPosition { 0 };
69 double currentVelocity { 0 };
70
71 double desiredPosition { 0 };
72 double desiredVelocity { 0 };
73
74 double startPosition { 0 };
75 MonotonicTime startTime;
76 double startVelocity { 0 };
77
78 Seconds animationTime;
79 MonotonicTime lastAnimationTime;
80
81 double attackPosition { 0 };
82 Seconds attackTime;
83 Curve attackCurve { Curve::Quadratic };
84
85 double releasePosition { 0 };
86 Seconds releaseTime;
87 Curve releaseCurve { Curve::Quadratic };
88
89 int visibleLength { 0 };
90 };
91
92 bool updatePerAxisData(PerAxisData&, ScrollGranularity, float delta, float minScrollPosition, float maxScrollPosition);
93 bool animateScroll(PerAxisData&, MonotonicTime currentTime);
94
95 void requestAnimationTimerFired();
96 void startNextTimer(Seconds delay);
97 void animationTimerFired();
98 bool animationTimerActive() const;
99
100 WTF::Function<void (FloatPoint&&)> m_notifyPositionChangedFunction;
101
102 PerAxisData m_horizontalData;
103 PerAxisData m_verticalData;
104
105 MonotonicTime m_startTime;
106 Timer m_animationTimer;
107};
108
109} // namespace WebCore
110
111#endif // ENABLE(SMOOTH_SCROLLING)
112