libs/WindowManager/Shell/src/com/android/wm/shell/transition/SleepHandler.java

/*
 * Copyright (C) 2023 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.wm.shell.transition;

import android.annotation.NonNull;
import android.annotation.Nullable;
import android.os.IBinder;
import android.view.SurfaceControl;
import android.window.TransitionInfo;
import android.window.TransitionRequestInfo;
import android.window.WindowContainerTransaction;

import java.util.ArrayList;

/**
 * A Simple handler that tracks SLEEP transitions. We track them specially since we (ab)use these
 * as sentinels for fast-forwarding through animations when the screen is off.
 *
 * There should only be one SleepHandler and it is used explicitly by {@link Transitions} so we
 * don't register it like a normal handler.
 */
class SleepHandler implements Transitions.TransitionHandler {
    final ArrayList<IBinder> mSleepTransitions = new ArrayList<>();

    @Override
    public boolean startAnimation(@NonNull IBinder transition, @NonNull TransitionInfo info,
            @NonNull SurfaceControl.Transaction startTransaction,
            @NonNull SurfaceControl.Transaction finishTransaction,
            @NonNull Transitions.TransitionFinishCallback finishCallback) {
        mSleepTransitions.remove(transition);
        startTransaction.apply();
        finishCallback.onTransitionFinished(null, null);
        return true;
    }

    @Override
    @Nullable
    public WindowContainerTransaction handleRequest(@NonNull IBinder transition,
            @NonNull TransitionRequestInfo request) {
        mSleepTransitions.add(transition);
        return new WindowContainerTransaction();
    }

    @Override
    public void onTransitionConsumed(@NonNull IBinder transition, boolean aborted,
            @Nullable SurfaceControl.Transaction finishTransaction) {
        mSleepTransitions.remove(transition);
    }
}