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/*
* Copyright (C) 2018 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 android.annotation.TargetApi;
import android.os.Build;
import android.view.Choreographer;
import android.view.MotionEvent;
import android.view.VelocityTracker;
/**
* A TouchConsumer which defers all events on the UIThread until the consumer is created.
*/
@TargetApi(Build.VERSION_CODES.P)
public class DeferredTouchConsumer implements TouchConsumer {
private final VelocityTracker mVelocityTracker;
private final DeferredTouchProvider mTouchProvider;
private MotionEventQueue mMyQueue;
private TouchConsumer mTarget;
public DeferredTouchConsumer(DeferredTouchProvider touchProvider) {
mVelocityTracker = VelocityTracker.obtain();
mTouchProvider = touchProvider;
}
@Override
public void accept(MotionEvent event) {
mTarget.accept(event);
}
@Override
public void reset() {
mTarget.reset();
}
@Override
public void updateTouchTracking(int interactionType) {
mTarget.updateTouchTracking(interactionType);
}
@Override
public void onQuickScrubEnd() {
mTarget.onQuickScrubEnd();
}
@Override
public void onQuickScrubProgress(float progress) {
mTarget.onQuickScrubProgress(progress);
}
@Override
public void preProcessMotionEvent(MotionEvent ev) {
mVelocityTracker.addMovement(ev);
}
@Override
public Choreographer getIntrimChoreographer(MotionEventQueue queue) {
mMyQueue = queue;
return null;
}
@Override
public void deferInit() {
mTarget = mTouchProvider.createTouchConsumer(mVelocityTracker);
mTarget.getIntrimChoreographer(mMyQueue);
}
@Override
public boolean forceToLauncherConsumer() {
return mTarget.forceToLauncherConsumer();
}
@Override
public boolean deferNextEventToMainThread() {
// If our target is still null, defer the next target as well
TouchConsumer target = mTarget;
return target == null ? true : target.deferNextEventToMainThread();
}
public interface DeferredTouchProvider {
TouchConsumer createTouchConsumer(VelocityTracker tracker);
}
}