1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
/*
* Copyright (C) 2016 Igalia S.L.
* Copyright (C) 2015-2021 Apple Inc. All rights reserved.
* Copyright (c) 2011, Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "ScrollAnimationSmooth.h"
#include "FloatPoint.h"
#include "GeometryUtilities.h"
#include "ScrollExtents.h"
#include "ScrollableArea.h"
#include "TimingFunction.h"
#include <wtf/TZoneMallocInlines.h>
#include <wtf/text/TextStream.h>
namespace WebCore {
WTF_MAKE_TZONE_ALLOCATED_IMPL(ScrollAnimationSmooth);
static const float animationSpeed { 1000.0f };
static const Seconds maxAnimationDuration { 200_ms };
ScrollAnimationSmooth::ScrollAnimationSmooth(ScrollAnimationClient& client)
: ScrollAnimation(Type::Smooth, client)
, m_timingFunction(CubicBezierTimingFunction::create())
{
}
ScrollAnimationSmooth::~ScrollAnimationSmooth() = default;
bool ScrollAnimationSmooth::startAnimatedScrollToDestination(const FloatPoint& fromOffset, const FloatPoint& destinationOffset)
{
auto extents = m_client.scrollExtentsForAnimation(*this);
m_currentOffset = m_startOffset = fromOffset;
m_destinationOffset = destinationOffset.constrainedBetween(extents.minimumScrollOffset(), extents.maximumScrollOffset());
if (!isActive() && fromOffset == m_destinationOffset)
return false;
m_duration = durationFromDistance(m_destinationOffset - m_startOffset);
if (!m_duration)
return false;
downcast<CubicBezierTimingFunction>(*m_timingFunction).setTimingFunctionPreset(CubicBezierTimingFunction::TimingFunctionPreset::EaseInOut);
if (!isActive())
didStart(MonotonicTime::now());
return true;
}
bool ScrollAnimationSmooth::retargetActiveAnimation(const FloatPoint& newOffset)
{
if (!isActive())
return false;
auto extents = m_client.scrollExtentsForAnimation(*this);
m_startTime = MonotonicTime::now();
m_startOffset = m_currentOffset;
m_destinationOffset = newOffset.constrainedBetween(extents.minimumScrollOffset(), extents.maximumScrollOffset());
m_duration = durationFromDistance(m_destinationOffset - m_startOffset);
downcast<CubicBezierTimingFunction>(*m_timingFunction).setTimingFunctionPreset(CubicBezierTimingFunction::TimingFunctionPreset::EaseOut);
m_timingFunction = CubicBezierTimingFunction::create(CubicBezierTimingFunction::TimingFunctionPreset::EaseOut);
if (m_currentOffset == m_destinationOffset || !m_duration)
return false;
return true;
}
void ScrollAnimationSmooth::updateScrollExtents()
{
auto extents = m_client.scrollExtentsForAnimation(*this);
// FIXME: Ideally fix up m_startOffset so m_currentOffset doesn't go backwards.
m_destinationOffset = m_destinationOffset.constrainedBetween(extents.minimumScrollOffset(), extents.maximumScrollOffset());
}
Seconds ScrollAnimationSmooth::durationFromDistance(const FloatSize& delta) const
{
float distance = euclidianDistance(delta);
return std::min(Seconds(distance / animationSpeed), maxAnimationDuration);
}
inline float linearInterpolation(float progress, float a, float b)
{
return a + progress * (b - a);
}
void ScrollAnimationSmooth::serviceAnimation(MonotonicTime currentTime)
{
bool animationActive = animateScroll(currentTime);
m_client.scrollAnimationDidUpdate(*this, m_currentOffset);
if (!animationActive)
didEnd();
}
bool ScrollAnimationSmooth::animateScroll(MonotonicTime currentTime)
{
MonotonicTime endTime = m_startTime + m_duration;
currentTime = std::min(currentTime, endTime);
double fractionComplete = (currentTime - m_startTime) / m_duration;
double progress = m_timingFunction->transformProgress(fractionComplete, m_duration.value());
m_currentOffset = {
linearInterpolation(progress, m_startOffset.x(), m_destinationOffset.x()),
linearInterpolation(progress, m_startOffset.y(), m_destinationOffset.y()),
};
return currentTime < endTime;
}
String ScrollAnimationSmooth::debugDescription() const
{
TextStream textStream;
textStream << "ScrollAnimationSmooth " << this << " active " << isActive() << " from " << m_startOffset << " to " << m_destinationOffset << " current offset " << currentOffset();
return textStream.release();
}
} // namespace WebCore
|
