103 lines
4.2 KiB
C++
103 lines
4.2 KiB
C++
/*
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* Copyright (C) 2014-2015 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "FloatPoint.h"
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#include "FloatSize.h"
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#include "LayoutPoint.h"
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#include "PlatformWheelEvent.h"
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#include "ScrollSnapOffsetsInfo.h"
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#include "ScrollTypes.h"
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#include "ScrollingMomentumCalculator.h"
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#include <wtf/MonotonicTime.h>
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namespace WTF {
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class TextStream;
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}
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namespace WebCore {
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enum class ScrollSnapState {
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Snapping,
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Gliding,
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DestinationReached,
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UserInteraction
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};
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class ScrollSnapAnimatorState {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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const Vector<SnapOffset<LayoutUnit>>& snapOffsetsForAxis(ScrollEventAxis axis) const
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{
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return axis == ScrollEventAxis::Horizontal ? m_snapOffsetsInfo.horizontalSnapOffsets : m_snapOffsetsInfo.verticalSnapOffsets;
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}
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const LayoutScrollSnapOffsetsInfo& snapOffsetInfo() const { return m_snapOffsetsInfo; }
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void setSnapOffsetInfo(const LayoutScrollSnapOffsetsInfo& newInfo) { m_snapOffsetsInfo = newInfo; }
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ScrollSnapState currentState() const { return m_currentState; }
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std::optional<unsigned> activeSnapIndexForAxis(ScrollEventAxis axis) const
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{
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return axis == ScrollEventAxis::Horizontal ? m_activeSnapIndexX : m_activeSnapIndexY;
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}
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void setActiveSnapIndexForAxis(ScrollEventAxis axis, std::optional<unsigned> index)
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{
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if (axis == ScrollEventAxis::Horizontal)
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m_activeSnapIndexX = index;
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else
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m_activeSnapIndexY = index;
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}
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FloatPoint currentAnimatedScrollOffset(MonotonicTime, bool& isAnimationComplete) const;
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// State transition helpers.
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void transitionToSnapAnimationState(const FloatSize& contentSize, const FloatSize& viewportSize, float pageScale, const FloatPoint& initialOffset);
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void transitionToGlideAnimationState(const FloatSize& contentSize, const FloatSize& viewportSize, float pageScale, const FloatPoint& initialOffset, const FloatSize& initialVelocity, const FloatSize& initialDelta);
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void transitionToUserInteractionState();
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void transitionToDestinationReachedState();
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private:
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std::pair<float, std::optional<unsigned>> targetOffsetForStartOffset(ScrollEventAxis, const FloatSize& viewportSize, float maxScrollOffset, float startOffset, FloatPoint predictedOffset, float pageScale, float initialDelta) const;
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void teardownAnimationForState(ScrollSnapState);
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void setupAnimationForState(ScrollSnapState, const FloatSize& contentSize, const FloatSize& viewportSize, float pageScale, const FloatPoint& initialOffset, const FloatSize& initialVelocity, const FloatSize& initialDelta);
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ScrollSnapState m_currentState { ScrollSnapState::UserInteraction };
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LayoutScrollSnapOffsetsInfo m_snapOffsetsInfo;
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std::optional<unsigned> m_activeSnapIndexX;
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std::optional<unsigned> m_activeSnapIndexY;
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MonotonicTime m_startTime;
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std::unique_ptr<ScrollingMomentumCalculator> m_momentumCalculator;
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};
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WTF::TextStream& operator<<(WTF::TextStream&, const ScrollSnapAnimatorState&);
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} // namespace WebCore
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