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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.server.wm;
import android.util.ArrayMap;
import android.util.ArraySet;
import java.io.PrintWriter;
import java.util.ArrayList;
/**
* Keeps track of all {@link AppWindowToken} that are animating and makes sure all animations are
* finished at the same time such that we don't run into issues with z-ordering: An activity A
* that has a shorter animation that is above another activity B with a longer animation in the same
* task, the animation layer would put the B on top of A, but from the hierarchy, A needs to be on
* top of B. Thus, we defer reparenting A to the original hierarchy such that it stays on top of B
* until B finishes animating.
*/
class AnimatingAppWindowTokenRegistry {
private ArraySet<AppWindowToken> mAnimatingTokens = new ArraySet<>();
private ArrayMap<AppWindowToken, Runnable> mFinishedTokens = new ArrayMap<>();
private ArrayList<Runnable> mTmpRunnableList = new ArrayList<>();
private boolean mEndingDeferredFinish;
/**
* Notifies that an {@link AppWindowToken} has started animating.
*/
void notifyStarting(AppWindowToken token) {
mAnimatingTokens.add(token);
}
/**
* Notifies that an {@link AppWindowToken} has finished animating.
*/
void notifyFinished(AppWindowToken token) {
mAnimatingTokens.remove(token);
mFinishedTokens.remove(token);
// If we were the last token, make sure the end all deferred finishes.
if (mAnimatingTokens.isEmpty()) {
endDeferringFinished();
}
}
/**
* Called when an {@link AppWindowToken} is about to finish animating.
*
* @param endDeferFinishCallback Callback to run when defer finish should be ended.
* @return {@code true} if finishing the animation should be deferred, {@code false} otherwise.
*/
boolean notifyAboutToFinish(AppWindowToken token, Runnable endDeferFinishCallback) {
final boolean removed = mAnimatingTokens.remove(token);
if (!removed) {
return false;
}
if (mAnimatingTokens.isEmpty()) {
// If no animations are animating anymore, finish all others.
endDeferringFinished();
return false;
} else {
// Otherwise let's put it into the pending list of to be finished animations.
mFinishedTokens.put(token, endDeferFinishCallback);
return true;
}
}
private void endDeferringFinished() {
// Don't start recursing. Running the finished listener invokes notifyFinished, which may
// invoked us again.
if (mEndingDeferredFinish) {
return;
}
try {
mEndingDeferredFinish = true;
// Copy it into a separate temp list to avoid modifying the collection while iterating
// as calling the callback may call back into notifyFinished.
for (int i = mFinishedTokens.size() - 1; i >= 0; i--) {
mTmpRunnableList.add(mFinishedTokens.valueAt(i));
}
mFinishedTokens.clear();
for (int i = mTmpRunnableList.size() - 1; i >= 0; i--) {
mTmpRunnableList.get(i).run();
}
mTmpRunnableList.clear();
} finally {
mEndingDeferredFinish = false;
}
}
void dump(PrintWriter pw, String header, String prefix) {
if (!mAnimatingTokens.isEmpty() || !mFinishedTokens.isEmpty()) {
pw.print(prefix); pw.println(header);
prefix = prefix + " ";
pw.print(prefix); pw.print("mAnimatingTokens="); pw.println(mAnimatingTokens);
pw.print(prefix); pw.print("mFinishedTokens="); pw.println(mFinishedTokens);
}
}
}
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