| /* |
| * 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); |
| } |
| } |
| } |