| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License |
| */ |
| |
| package android.view; |
| |
| import android.annotation.UnsupportedAppUsage; |
| import android.os.Looper; |
| |
| /** |
| * Similar to {@link InputEventReceiver}, but batches events to vsync boundaries when possible. |
| * @hide |
| */ |
| public class BatchedInputEventReceiver extends InputEventReceiver { |
| Choreographer mChoreographer; |
| private boolean mBatchedInputScheduled; |
| |
| @UnsupportedAppUsage |
| public BatchedInputEventReceiver( |
| InputChannel inputChannel, Looper looper, Choreographer choreographer) { |
| super(inputChannel, looper); |
| mChoreographer = choreographer; |
| } |
| |
| @Override |
| public void onBatchedInputEventPending() { |
| scheduleBatchedInput(); |
| } |
| |
| @Override |
| public void dispose() { |
| unscheduleBatchedInput(); |
| super.dispose(); |
| } |
| |
| void doConsumeBatchedInput(long frameTimeNanos) { |
| if (mBatchedInputScheduled) { |
| mBatchedInputScheduled = false; |
| if (consumeBatchedInputEvents(frameTimeNanos) && frameTimeNanos != -1) { |
| // If we consumed a batch here, we want to go ahead and schedule the |
| // consumption of batched input events on the next frame. Otherwise, we would |
| // wait until we have more input events pending and might get starved by other |
| // things occurring in the process. If the frame time is -1, however, then |
| // we're in a non-batching mode, so there's no need to schedule this. |
| scheduleBatchedInput(); |
| } |
| } |
| } |
| |
| private void scheduleBatchedInput() { |
| if (!mBatchedInputScheduled) { |
| mBatchedInputScheduled = true; |
| mChoreographer.postCallback(Choreographer.CALLBACK_INPUT, mBatchedInputRunnable, null); |
| } |
| } |
| |
| private void unscheduleBatchedInput() { |
| if (mBatchedInputScheduled) { |
| mBatchedInputScheduled = false; |
| mChoreographer.removeCallbacks( |
| Choreographer.CALLBACK_INPUT, mBatchedInputRunnable, null); |
| } |
| } |
| |
| private final class BatchedInputRunnable implements Runnable { |
| @Override |
| public void run() { |
| doConsumeBatchedInput(mChoreographer.getFrameTimeNanos()); |
| } |
| } |
| private final BatchedInputRunnable mBatchedInputRunnable = new BatchedInputRunnable(); |
| } |