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/*
* Copyright (C) 2016 Igalia S.L.
* 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.
*/
#pragma once
#include "FloatPoint.h"
#include "ScrollTypes.h"
#include <wtf/FastMalloc.h>
#include <wtf/MonotonicTime.h>
namespace WebCore {
class FloatPoint;
class ScrollAnimation;
struct ScrollExtents;
class ScrollAnimationClient {
public:
virtual ~ScrollAnimationClient() = default;
virtual void scrollAnimationDidUpdate(ScrollAnimation&, const FloatPoint& /* currentOffset */) { }
virtual void scrollAnimationWillStart(ScrollAnimation&) { }
virtual void scrollAnimationDidEnd(ScrollAnimation&) { }
virtual ScrollExtents scrollExtentsForAnimation(ScrollAnimation&) = 0;
virtual FloatSize overscrollAmount(ScrollAnimation&) = 0;
virtual FloatPoint scrollOffset(ScrollAnimation&) = 0;
};
class ScrollAnimation {
WTF_MAKE_FAST_ALLOCATED;
public:
enum class Type {
Smooth,
Kinetic,
Momentum,
RubberBand,
Keyboard,
};
ScrollAnimation(Type animationType, ScrollAnimationClient& client)
: m_client(client)
, m_animationType(animationType)
{ }
virtual ~ScrollAnimation() = default;
Type type() const { return m_animationType; }
virtual ScrollClamping clamping() const { return ScrollClamping::Clamped; }
virtual bool retargetActiveAnimation(const FloatPoint& newDestinationOffset) = 0;
virtual void stop()
{
if (!m_isActive)
return;
didEnd();
}
virtual bool isActive() const { return m_isActive; }
virtual void updateScrollExtents() { };
FloatPoint currentOffset() const { return m_currentOffset; }
virtual std::optional<FloatPoint> destinationOffset() const { return std::nullopt; }
virtual void serviceAnimation(MonotonicTime) = 0;
virtual String debugDescription() const = 0;
protected:
void didStart(MonotonicTime currentTime)
{
m_startTime = currentTime;
m_isActive = true;
m_client.scrollAnimationWillStart(*this);
}
void didEnd()
{
m_isActive = false;
m_client.scrollAnimationDidEnd(*this);
}
Seconds timeSinceStart(MonotonicTime currentTime) const
{
return currentTime - m_startTime;
}
ScrollAnimationClient& m_client;
const Type m_animationType;
bool m_isActive { false };
MonotonicTime m_startTime;
FloatPoint m_currentOffset;
};
WTF::TextStream& operator<<(WTF::TextStream&, ScrollAnimation::Type);
WTF::TextStream& operator<<(WTF::TextStream&, const ScrollAnimation&);
} // namespace WebCore
#define SPECIALIZE_TYPE_TRAITS_SCROLL_ANIMATION(ToValueTypeName, predicate) \
SPECIALIZE_TYPE_TRAITS_BEGIN(ToValueTypeName) \
static bool isType(const WebCore::ScrollAnimation& scrollAnimation) { return scrollAnimation.predicate; } \
SPECIALIZE_TYPE_TRAITS_END()
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