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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /layout/generic/ScrollAnimationPhysics.h | |
parent | Initial commit. (diff) | |
download | firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | layout/generic/ScrollAnimationPhysics.h | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/layout/generic/ScrollAnimationPhysics.h b/layout/generic/ScrollAnimationPhysics.h new file mode 100644 index 0000000000..0a1bae0532 --- /dev/null +++ b/layout/generic/ScrollAnimationPhysics.h @@ -0,0 +1,60 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef mozilla_layout_ScrollAnimationPhysics_h_ +#define mozilla_layout_ScrollAnimationPhysics_h_ + +#include "mozilla/TimeStamp.h" +#include "nsPoint.h" +#include "Units.h" + +namespace mozilla { + +class ScrollAnimationPhysics { + public: + // Update the animation to have |aDestination| as its new destination. + // The animation's current position remains unchanged, and the shape + // of the animation curve is recomputed between the current position + // and the new destination. + // This is used in cases where an input event that would cause another + // animation of this kind is received while this animation is running. + virtual void Update(const TimeStamp& aTime, const nsPoint& aDestination, + const nsSize& aCurrentVelocity) = 0; + + // Shift both the current position and the destination of the animation + // by |aShiftDelta|. The progress of the animation along its animation + // curve is unchanged. + // This is used in cases where the main thread changes the scroll offset + // (e.g. via scrollBy()) but we want the "momentum" represented by the + // animation to be preserved. + virtual void ApplyContentShift(const CSSPoint& aShiftDelta) = 0; + + // Get the velocity at a point in time in nscoords/sec. + virtual nsSize VelocityAt(const TimeStamp& aTime) = 0; + + // Returns the expected scroll position at a given point in time, in app + // units, relative to the scroll frame. + virtual nsPoint PositionAt(const TimeStamp& aTime) = 0; + + virtual bool IsFinished(const TimeStamp& aTime) = 0; + + virtual ~ScrollAnimationPhysics() = default; +}; + +// Helper for accelerated wheel deltas. This can be called from the main thread +// or the APZ Controller thread. +static inline double ComputeAcceleratedWheelDelta(double aDelta, + int32_t aCounter, + int32_t aFactor) { + if (!aDelta) { + return aDelta; + } + return (aDelta * aCounter * double(aFactor) / 10); +} + +} // namespace mozilla + +#endif // mozilla_layout_ScrollAnimationPhysics_h_ |