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/*
* Copyright (C) 2021 Apple 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 "ScrollAnimationMomentum.h"
#include "Logging.h"
#include "ScrollingMomentumCalculator.h"
#include <wtf/text/TextStream.h>
namespace WebCore {
ScrollAnimationMomentum::ScrollAnimationMomentum(ScrollAnimationClient& client)
: ScrollAnimation(Type::Momentum, client)
{
}
ScrollAnimationMomentum::~ScrollAnimationMomentum() = default;
bool ScrollAnimationMomentum::startAnimatedScrollWithInitialVelocity(const FloatPoint& initialOffset, const FloatSize& initialVelocity, const FloatSize& initialDelta, const Function<FloatPoint(const FloatPoint&)>& destinationModifier)
{
auto extents = m_client.scrollExtentsForAnimation(*this);
m_currentOffset = initialOffset;
m_momentumCalculator = ScrollingMomentumCalculator::create(extents, initialOffset, initialDelta, initialVelocity);
auto destinationScrollOffset = m_momentumCalculator->destinationScrollOffset();
if (destinationModifier) {
auto modifiedOffset = destinationModifier(destinationScrollOffset);
if (modifiedOffset != destinationScrollOffset) {
LOG_WITH_STREAM(ScrollAnimations, stream << "ScrollAnimationMomentum " << this << " startAnimatedScrollWithInitialVelocity - predicted offset " << destinationScrollOffset << " modified to " << modifiedOffset);
destinationScrollOffset = modifiedOffset;
m_momentumCalculator->setRetargetedScrollOffset(destinationScrollOffset);
}
}
LOG(ScrollAnimations, "ScrollAnimationMomentum::startAnimatedScrollWithInitialVelocity: velocity %.2f,%.2f from %.2f,%.2f to %.2f,%.2f",
initialVelocity.width(), initialVelocity.height(), initialOffset.x(), initialOffset.y(), destinationScrollOffset.x(), destinationScrollOffset.y());
if (destinationScrollOffset == initialOffset) {
m_momentumCalculator = nullptr;
return false;
}
didStart(MonotonicTime::now());
return true;
}
bool ScrollAnimationMomentum::retargetActiveAnimation(const FloatPoint& newDestination)
{
if (m_momentumCalculator && isActive()) {
m_momentumCalculator->setRetargetedScrollOffset(newDestination);
auto newDuration = m_momentumCalculator->animationDuration();
bool animationComplete = newDuration > 0_s;
if (animationComplete)
didEnd();
return !animationComplete;
}
return false;
}
void ScrollAnimationMomentum::stop()
{
LOG(ScrollAnimations, "ScrollAnimationMomentum::stop: offset %.2f,%.2f", m_currentOffset.x(), m_currentOffset.y());
m_momentumCalculator = nullptr;
ScrollAnimation::stop();
}
void ScrollAnimationMomentum::serviceAnimation(MonotonicTime currentTime)
{
if (!m_momentumCalculator) {
ASSERT_NOT_REACHED();
return;
}
auto elapsedTime = timeSinceStart(currentTime);
bool animationComplete = elapsedTime >= m_momentumCalculator->animationDuration();
m_currentOffset = m_momentumCalculator->scrollOffsetAfterElapsedTime(elapsedTime);
m_client.scrollAnimationDidUpdate(*this, m_currentOffset);
LOG(ScrollAnimations, "ScrollAnimationMomentum::serviceAnimation: offset %.2f,%.2f complete %d", m_currentOffset.x(), m_currentOffset.y(), animationComplete);
if (animationComplete)
didEnd();
}
void ScrollAnimationMomentum::updateScrollExtents()
{
auto extents = m_client.scrollExtentsForAnimation(*this);
auto predictedScrollOffset = m_momentumCalculator->destinationScrollOffset();
auto constrainedOffset = predictedScrollOffset.constrainedBetween(extents.minimumScrollOffset(), extents.maximumScrollOffset());
if (constrainedOffset != predictedScrollOffset)
retargetActiveAnimation(constrainedOffset);
}
String ScrollAnimationMomentum::debugDescription() const
{
TextStream textStream;
textStream << "ScrollAnimationMomentum " << this << " active " << isActive() << " destination " << (m_momentumCalculator ? m_momentumCalculator->destinationScrollOffset() : FloatPoint()) << " current offset " << currentOffset();
return textStream.release();
}
} // namespace WebCore
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