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/*
* 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.compat.annotation.UnsupportedAppUsage;
import android.os.Handler;
import android.os.Looper;
/**
* Similar to {@link InputEventReceiver}, but batches events to vsync boundaries when possible.
* @hide
*/
public class BatchedInputEventReceiver extends InputEventReceiver {
private Choreographer mChoreographer;
private boolean mBatchingEnabled;
private boolean mBatchedInputScheduled;
private final Handler mHandler;
private final Runnable mConsumeBatchedInputEvents = new Runnable() {
@Override
public void run() {
consumeBatchedInputEvents(-1);
}
};
@UnsupportedAppUsage
public BatchedInputEventReceiver(
InputChannel inputChannel, Looper looper, Choreographer choreographer) {
super(inputChannel, looper);
mChoreographer = choreographer;
mBatchingEnabled = true;
mHandler = new Handler(looper);
}
@Override
public void onBatchedInputEventPending(int source) {
if (mBatchingEnabled) {
scheduleBatchedInput();
} else {
consumeBatchedInputEvents(-1);
}
}
@Override
public void dispose() {
unscheduleBatchedInput();
consumeBatchedInputEvents(-1);
super.dispose();
}
/**
* Sets whether to enable batching on this input event receiver.
* @hide
*/
public void setBatchingEnabled(boolean batchingEnabled) {
if (mBatchingEnabled == batchingEnabled) {
return;
}
mBatchingEnabled = batchingEnabled;
mHandler.removeCallbacks(mConsumeBatchedInputEvents);
if (!batchingEnabled) {
unscheduleBatchedInput();
mHandler.post(mConsumeBatchedInputEvents);
}
}
protected 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();
/**
* A {@link BatchedInputEventReceiver} that reports events to an {@link InputEventListener}.
* @hide
*/
public static class SimpleBatchedInputEventReceiver extends BatchedInputEventReceiver {
/** @hide */
public interface InputEventListener {
/**
* Process the input event.
* @return handled
*/
boolean onInputEvent(InputEvent event);
}
protected InputEventListener mListener;
public SimpleBatchedInputEventReceiver(InputChannel inputChannel, Looper looper,
Choreographer choreographer, InputEventListener listener) {
super(inputChannel, looper, choreographer);
mListener = listener;
}
@Override
public void onInputEvent(InputEvent event) {
boolean handled = false;
try {
handled = mListener.onInputEvent(event);
} finally {
finishInputEvent(event, handled);
}
}
}
}
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