Wale Ogunwale | 4f52bc6 | 2015-09-24 13:47:31 -0700 | [diff] [blame] | 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 | |
| 29 | public BatchedInputEventReceiver( |
| 30 | InputChannel inputChannel, Looper looper, Choreographer choreographer) { |
| 31 | super(inputChannel, looper); |
| 32 | mChoreographer = choreographer; |
| 33 | } |
| 34 | |
| 35 | @Override |
| 36 | public void onBatchedInputEventPending() { |
| 37 | scheduleBatchedInput(); |
| 38 | } |
| 39 | |
| 40 | @Override |
| 41 | public void dispose() { |
| 42 | unscheduleBatchedInput(); |
| 43 | super.dispose(); |
| 44 | } |
| 45 | |
| 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 | |
| 60 | private void scheduleBatchedInput() { |
| 61 | if (!mBatchedInputScheduled) { |
| 62 | mBatchedInputScheduled = true; |
| 63 | mChoreographer.postCallback(Choreographer.CALLBACK_INPUT, mBatchedInputRunnable, null); |
| 64 | } |
| 65 | } |
| 66 | |
| 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 |
| 77 | public void run() { |
| 78 | doConsumeBatchedInput(mChoreographer.getFrameTimeNanos()); |
| 79 | } |
| 80 | } |
| 81 | private final BatchedInputRunnable mBatchedInputRunnable = new BatchedInputRunnable(); |
| 82 | } |