forked from mirrors/gecko-dev
680815cd6e
This patch was generated automatically by the "modeline.py" script, available here: https://github.com/amccreight/moz-source-tools/blob/master/modeline.py For every file that is modified in this patch, the changes are as follows: (1) The patch changes the file to use the exact C++ mode lines from the Mozilla coding style guide, available here: https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Coding_Style#Mode_Line (2) The patch deletes any blank lines between the mode line & the MPL boilerplate comment. (3) If the file previously had the mode lines and MPL boilerplate in a single contiguous C++ comment, then the patch splits them into separate C++ comments, to match the boilerplate in the coding style. MozReview-Commit-ID: EuRsDue63tK --HG-- extra : rebase_source : 3356d4b80ff6213935192e87cdbc9103fec6084c
94 lines
3.4 KiB
C++
94 lines
3.4 KiB
C++
/* -*- 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_ScrollAnimationBezierPhysics_h_
|
|
#define mozilla_layout_ScrollAnimationBezierPhysics_h_
|
|
|
|
#include "ScrollAnimationPhysics.h"
|
|
#include "nsSMILKeySpline.h"
|
|
|
|
namespace mozilla {
|
|
|
|
struct ScrollAnimationBezierPhysicsSettings
|
|
{
|
|
// These values are minimum and maximum animation duration per event,
|
|
// and a global ratio which defines how longer is the animation's duration
|
|
// compared to the average recent events intervals (such that for a relatively
|
|
// consistent events rate, the next event arrives before current animation ends)
|
|
int32_t mMinMS;
|
|
int32_t mMaxMS;
|
|
double mIntervalRatio;
|
|
};
|
|
|
|
// This class implements a cubic bezier timing function and automatically
|
|
// adapts the animation duration based on the scrolling rate.
|
|
class ScrollAnimationBezierPhysics : public ScrollAnimationPhysics
|
|
{
|
|
public:
|
|
explicit ScrollAnimationBezierPhysics(const nsPoint& aStartPos,
|
|
const ScrollAnimationBezierPhysicsSettings& aSettings);
|
|
|
|
void Update(const TimeStamp& aTime,
|
|
const nsPoint& aDestination,
|
|
const nsSize& aCurrentVelocity) override;
|
|
|
|
// Get the velocity at a point in time in nscoords/sec.
|
|
nsSize VelocityAt(const TimeStamp& aTime) override;
|
|
|
|
// Returns the expected scroll position at a given point in time, in app
|
|
// units, relative to the scroll frame.
|
|
nsPoint PositionAt(const TimeStamp& aTime) override;
|
|
|
|
bool IsFinished(const TimeStamp& aTime) override {
|
|
return aTime > mStartTime + mDuration;
|
|
}
|
|
|
|
protected:
|
|
double ProgressAt(const TimeStamp& aTime) const {
|
|
return clamped((aTime - mStartTime) / mDuration, 0.0, 1.0);
|
|
}
|
|
|
|
nscoord VelocityComponent(double aTimeProgress,
|
|
const nsSMILKeySpline& aTimingFunction,
|
|
nscoord aStart, nscoord aDestination) const;
|
|
|
|
// Calculate duration, possibly dynamically according to events rate and
|
|
// event origin. (also maintain previous timestamps - which are only used
|
|
// here).
|
|
TimeDuration ComputeDuration(const TimeStamp& aTime);
|
|
|
|
// Initializes the timing function in such a way that the current velocity is
|
|
// preserved.
|
|
void InitTimingFunction(nsSMILKeySpline& aTimingFunction,
|
|
nscoord aCurrentPos, nscoord aCurrentVelocity,
|
|
nscoord aDestination);
|
|
|
|
// Initialize event history.
|
|
void InitializeHistory(const TimeStamp& aTime);
|
|
|
|
// Cached Preferences values.
|
|
ScrollAnimationBezierPhysicsSettings mSettings;
|
|
|
|
// mPrevEventTime holds previous 3 timestamps for intervals averaging (to
|
|
// reduce duration fluctuations). When AsyncScroll is constructed and no
|
|
// previous timestamps are available (indicated with mIsFirstIteration),
|
|
// initialize mPrevEventTime using imaginary previous timestamps with maximum
|
|
// relevant intervals between them.
|
|
TimeStamp mPrevEventTime[3];
|
|
|
|
TimeStamp mStartTime;
|
|
|
|
nsPoint mStartPos;
|
|
nsPoint mDestination;
|
|
TimeDuration mDuration;
|
|
nsSMILKeySpline mTimingFunctionX;
|
|
nsSMILKeySpline mTimingFunctionY;
|
|
bool mIsFirstIteration;
|
|
};
|
|
|
|
} // namespace mozilla
|
|
|
|
#endif // mozilla_layout_ScrollAnimationBezierPhysics_h_
|