AndroidFlingPhysics.h (1601B)
1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ 2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */ 3 /* This Source Code Form is subject to the terms of the Mozilla Public 4 * License, v. 2.0. If a copy of the MPL was not distributed with this 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 6 7 #ifndef mozilla_layers_AndroidFlingPhysics_h_ 8 #define mozilla_layers_AndroidFlingPhysics_h_ 9 10 #include "AsyncPanZoomController.h" 11 #include "Units.h" 12 13 namespace mozilla { 14 namespace layers { 15 16 class AndroidFlingPhysics { 17 public: 18 void Init(const ParentLayerPoint& aVelocity, float aPLPPI); 19 void Sample(const TimeDuration& aDelta, ParentLayerPoint* aOutVelocity, 20 ParentLayerPoint* aOutOffset); 21 22 static void InitializeGlobalState(); 23 24 private: 25 // Returns false if the animation should end. 26 bool SampleImpl(const TimeDuration& aDelta, float* aOutVelocity); 27 28 // Information pertaining to the current fling. 29 // This is initialized on each call to Init(). 30 ParentLayerCoord mVelocity; // diagonal velocity (length of velocity vector) 31 TimeDuration mTargetDuration; 32 TimeDuration mDurationSoFar; 33 ParentLayerPoint mLastPos; 34 ParentLayerPoint mCurrentPos; 35 ParentLayerCoord mTargetDistance; // diagonal distance 36 ParentLayerPoint mTargetPos; // really a target *offset* relative to the 37 // start position, which we don't track 38 ParentLayerPoint mDeltaNorm; // mTargetPos with length normalized to 1 39 }; 40 41 } // namespace layers 42 } // namespace mozilla 43 44 #endif // mozilla_layers_AndroidFlingPhysics_h_