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