| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef UI_EVENTS_GESTURE_DETECTION_VELOCITY_TRACKER_STATE_H_ |
| #define UI_EVENTS_GESTURE_DETECTION_VELOCITY_TRACKER_STATE_H_ |
| |
| #include "base/basictypes.h" |
| #include "ui/events/gesture_detection/bitset_32.h" |
| #include "ui/events/gesture_detection/gesture_detection_export.h" |
| #include "ui/events/gesture_detection/velocity_tracker.h" |
| |
| namespace ui { |
| |
| class MotionEvent; |
| |
| // Port of VelocityTrackerState from Android |
| // * platform/frameworks/base/core/jni/android_view_VelocityTracker.cpp |
| // * Change-Id: I3517881b87b47dcc209d80dbd0ac6b5cf29a766f |
| // * Please update the Change-Id as upstream Android changes are pulled. |
| class GESTURE_DETECTION_EXPORT VelocityTrackerState { |
| public: |
| explicit VelocityTrackerState(VelocityTracker::Strategy strategy); |
| ~VelocityTrackerState(); |
| |
| void Clear(); |
| void AddMovement(const MotionEvent& event); |
| void ComputeCurrentVelocity(int32_t units, float max_velocity); |
| float GetXVelocity(int32_t id) const; |
| float GetYVelocity(int32_t id) const; |
| |
| private: |
| struct Velocity { |
| float vx, vy; |
| }; |
| |
| void GetVelocity(int32_t id, float* out_vx, float* out_vy) const; |
| |
| VelocityTracker velocity_tracker_; |
| int32_t active_pointer_id_; |
| BitSet32 calculated_id_bits_; |
| Velocity calculated_velocity_[VelocityTracker::MAX_POINTERS]; |
| |
| DISALLOW_COPY_AND_ASSIGN(VelocityTrackerState); |
| }; |
| |
| } // namespace ui |
| |
| #endif // UI_EVENTS_GESTURE_DETECTION_VELOCITY_TRACKER_STATE_H_ |