/* -*- 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/. */
/** * This class is used to track state that is used when determining whether a * fling should be accelerated.
*/ class FlingAccelerator final { public:
FlingAccelerator() {}
// Resets state so that the next fling will not be accelerated. void Reset();
// Returns false after a reset or before the first fling. bool IsTracking() const { return mIsTracking; }
// Starts a new fling, and returns the (potentially accelerated) velocity that // should be used for that fling.
ParentLayerPoint GetFlingStartingVelocity( const SampleTime& aNow, const ParentLayerPoint& aVelocity, const FlingHandoffState& aHandoffState);
// The initial velocity of the most recent fling.
ParentLayerPoint mPreviousFlingStartingVelocity; // The velocity that the previous fling animation had at the point it was // interrupted.
ParentLayerPoint mPreviousFlingCancelVelocity; // Whether the upcoming fling is eligible for acceleration. bool mIsTracking = false;
};
} // namespace layers
} // namespace mozilla
#endif// mozilla_layers_FlingAccelerator_h
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