1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License 15 */ 16 17 package com.android.systemui.statusbar.phone; 18 19 import android.util.Pools; 20 import android.view.MotionEvent; 21 import android.view.VelocityTracker; 22 23 /** 24 * An implementation of {@link VelocityTrackerInterface} using the platform-standard 25 * {@link VelocityTracker}. 26 */ 27 public class PlatformVelocityTracker implements VelocityTrackerInterface { 28 29 private static final Pools.SynchronizedPool<PlatformVelocityTracker> sPool = 30 new Pools.SynchronizedPool<>(2); 31 32 private VelocityTracker mTracker; 33 34 public static PlatformVelocityTracker obtain() { 35 PlatformVelocityTracker tracker = sPool.acquire(); 36 if (tracker == null) { 37 tracker = new PlatformVelocityTracker(); 38 } 39 tracker.setTracker(VelocityTracker.obtain()); 40 return tracker; 41 } 42 43 public void setTracker(VelocityTracker tracker) { 44 mTracker = tracker; 45 } 46 47 @Override 48 public void addMovement(MotionEvent event) { 49 mTracker.addMovement(event); 50 } 51 52 @Override 53 public void computeCurrentVelocity(int units) { 54 mTracker.computeCurrentVelocity(units); 55 } 56 57 @Override 58 public float getXVelocity() { 59 return mTracker.getXVelocity(); 60 } 61 62 @Override 63 public float getYVelocity() { 64 return mTracker.getYVelocity(); 65 } 66 67 @Override 68 public void recycle() { 69 mTracker.recycle(); 70 sPool.release(this); 71 } 72 } 73
