1 /* 2 * Copyright (C) 2015 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 android.view; 18 19 import android.compat.annotation.UnsupportedAppUsage; 20 import android.os.Looper; 21 22 /** 23 * Similar to {@link InputEventReceiver}, but batches events to vsync boundaries when possible. 24 * @hide 25 */ 26 public class BatchedInputEventReceiver extends InputEventReceiver { 27 Choreographer mChoreographer; 28 private boolean mBatchedInputScheduled; 29 30 @UnsupportedAppUsage BatchedInputEventReceiver( InputChannel inputChannel, Looper looper, Choreographer choreographer)31 public BatchedInputEventReceiver( 32 InputChannel inputChannel, Looper looper, Choreographer choreographer) { 33 super(inputChannel, looper); 34 mChoreographer = choreographer; 35 } 36 37 @Override onBatchedInputEventPending(int source)38 public void onBatchedInputEventPending(int source) { 39 scheduleBatchedInput(); 40 } 41 42 @Override dispose()43 public void dispose() { 44 unscheduleBatchedInput(); 45 super.dispose(); 46 } 47 doConsumeBatchedInput(long frameTimeNanos)48 void doConsumeBatchedInput(long frameTimeNanos) { 49 if (mBatchedInputScheduled) { 50 mBatchedInputScheduled = false; 51 if (consumeBatchedInputEvents(frameTimeNanos) && frameTimeNanos != -1) { 52 // If we consumed a batch here, we want to go ahead and schedule the 53 // consumption of batched input events on the next frame. Otherwise, we would 54 // wait until we have more input events pending and might get starved by other 55 // things occurring in the process. If the frame time is -1, however, then 56 // we're in a non-batching mode, so there's no need to schedule this. 57 scheduleBatchedInput(); 58 } 59 } 60 } 61 scheduleBatchedInput()62 private void scheduleBatchedInput() { 63 if (!mBatchedInputScheduled) { 64 mBatchedInputScheduled = true; 65 mChoreographer.postCallback(Choreographer.CALLBACK_INPUT, mBatchedInputRunnable, null); 66 } 67 } 68 unscheduleBatchedInput()69 private void unscheduleBatchedInput() { 70 if (mBatchedInputScheduled) { 71 mBatchedInputScheduled = false; 72 mChoreographer.removeCallbacks( 73 Choreographer.CALLBACK_INPUT, mBatchedInputRunnable, null); 74 } 75 } 76 77 private final class BatchedInputRunnable implements Runnable { 78 @Override run()79 public void run() { 80 doConsumeBatchedInput(mChoreographer.getFrameTimeNanos()); 81 } 82 } 83 private final BatchedInputRunnable mBatchedInputRunnable = new BatchedInputRunnable(); 84 } 85