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- // 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 <stdint.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(const VelocityTrackerState&) = delete;
- VelocityTrackerState& operator=(const VelocityTrackerState&) = delete;
- ~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];
- };
- } // namespace ui
- #endif // UI_EVENTS_GESTURE_DETECTION_VELOCITY_TRACKER_STATE_H_
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