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Depends on D194019 Differential Revision: https://phabricator.services.mozilla.com/D195353
70 lines
2.4 KiB
C++
70 lines
2.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_layout_ScrollAnimationMSDPhysics_h_
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#define mozilla_layout_ScrollAnimationMSDPhysics_h_
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#include "ScrollAnimationPhysics.h"
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#include "mozilla/layers/AxisPhysicsMSDModel.h"
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namespace mozilla {
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// This class implements a cubic MSD timing function and automatically
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// adapts the animation duration based on the scrolling rate.
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class ScrollAnimationMSDPhysics final : public ScrollAnimationPhysics {
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public:
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typedef mozilla::layers::AxisPhysicsMSDModel AxisPhysicsMSDModel;
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explicit ScrollAnimationMSDPhysics(const nsPoint& aStartPos);
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void Update(const TimeStamp& aTime, const nsPoint& aDestination,
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const nsSize& aCurrentVelocity) override;
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void ApplyContentShift(const CSSPoint& aShiftDelta) override;
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// Get the velocity at a point in time in nscoords/sec.
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nsSize VelocityAt(const TimeStamp& aTime) override;
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// Returns the expected scroll position at a given point in time, in app
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// units, relative to the scroll frame.
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nsPoint PositionAt(const TimeStamp& aTime) override;
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bool IsFinished(const TimeStamp& aTime) override {
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SimulateUntil(aTime);
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return mModelX.IsFinished(1) && mModelY.IsFinished(1);
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}
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protected:
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// A wrapper around AxisPhysicsMSDModel which takes additional steps to avoid
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// oscillating motion.
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class NonOscillatingAxisPhysicsMSDModel : public AxisPhysicsMSDModel {
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public:
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NonOscillatingAxisPhysicsMSDModel(double aInitialPosition,
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double aInitialDestination,
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double aInitialVelocity,
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double aSpringConstant,
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double aDampingRatio);
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};
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double ComputeSpringConstant(const TimeStamp& aTime);
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void SimulateUntil(const TimeStamp& aTime);
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TimeStamp mPreviousEventTime;
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TimeDuration mPreviousDelta;
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TimeStamp mStartTime;
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nsPoint mStartPos;
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nsPoint mDestination;
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TimeStamp mLastSimulatedTime;
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NonOscillatingAxisPhysicsMSDModel mModelX;
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NonOscillatingAxisPhysicsMSDModel mModelY;
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bool mIsFirstIteration;
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};
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} // namespace mozilla
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#endif // mozilla_layout_ScrollAnimationMSDPhysics_h_
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