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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 com.android.systemui;
import android.os.Handler;
import android.os.Looper;
import android.os.StrictMode;
import android.view.Choreographer;
import java.util.ArrayList;
/**
* Utility class for methods used to dejank the UI.
*/
public class DejankUtils {
private static final Choreographer sChoreographer = Choreographer.getInstance();
private static final Handler sHandler = new Handler();
private static final ArrayList<Runnable> sPendingRunnables = new ArrayList<>();
private static final Runnable sAnimationCallbackRunnable = new Runnable() {
@Override
public void run() {
for (int i = 0; i < sPendingRunnables.size(); i++) {
sHandler.post(sPendingRunnables.get(i));
}
sPendingRunnables.clear();
}
};
/**
* Executes {@code r} after performTraversals. Use this do to CPU heavy work for which the
* timing is not critical for animation. The work is then scheduled at the same time
* RenderThread is doing its thing, leading to better parallelization.
*
* <p>Needs to be called from the main thread.
*/
public static void postAfterTraversal(Runnable r) {
throwIfNotCalledOnMainThread();
sPendingRunnables.add(r);
postAnimationCallback();
}
/**
* Removes a previously scheduled runnable.
*
* <p>Needs to be called from the main thread.
*/
public static void removeCallbacks(Runnable r) {
throwIfNotCalledOnMainThread();
sPendingRunnables.remove(r);
sHandler.removeCallbacks(r);
}
private static void postAnimationCallback() {
sChoreographer.postCallback(Choreographer.CALLBACK_ANIMATION, sAnimationCallbackRunnable,
null);
}
private static void throwIfNotCalledOnMainThread() {
if (!Looper.getMainLooper().isCurrentThread()) {
throw new IllegalStateException("should be called from the main thread.");
}
}
}
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