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/*
* Copyright (C) 2017 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 com.android.quickstep;
import static android.view.MotionEvent.ACTION_CANCEL;
import static android.view.MotionEvent.ACTION_MOVE;
import android.view.Choreographer;
import android.view.MotionEvent;
import com.android.systemui.shared.system.ChoreographerCompat;
import java.util.ArrayList;
import java.util.function.Consumer;
/**
* Helper class for batching input events
*/
public class MotionEventQueue implements Runnable {
// We use two arrays and swap the current index when one array is being consumed
private final EventArray[] mArrays = new EventArray[] {new EventArray(), new EventArray()};
private int mCurrentIndex = 0;
private final Choreographer mChoreographer;
private final Consumer<MotionEvent> mConsumer;
public MotionEventQueue(Choreographer choreographer, Consumer<MotionEvent> consumer) {
mChoreographer = choreographer;
mConsumer = consumer;
}
public void queue(MotionEvent event) {
synchronized (mArrays) {
EventArray array = mArrays[mCurrentIndex];
if (array.isEmpty()) {
ChoreographerCompat.postInputFrame(mChoreographer, this);
}
int eventAction = event.getAction();
if (eventAction == ACTION_MOVE && array.lastEventAction == ACTION_MOVE) {
// Replace and recycle the last event
array.set(array.size() - 1, event).recycle();
} else {
array.add(event);
array.lastEventAction = eventAction;
}
}
}
@Override
public void run() {
EventArray array = swapAndGetCurrentArray();
int size = array.size();
for (int i = 0; i < size; i++) {
MotionEvent event = array.get(i);
mConsumer.accept(event);
event.recycle();
}
array.clear();
array.lastEventAction = ACTION_CANCEL;
}
private EventArray swapAndGetCurrentArray() {
synchronized (mArrays) {
EventArray current = mArrays[mCurrentIndex];
mCurrentIndex = mCurrentIndex ^ 1;
return current;
}
}
private static class EventArray extends ArrayList<MotionEvent> {
public int lastEventAction = ACTION_CANCEL;
public EventArray() {
super(4);
}
}
}
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