| /* |
| * Copyright (C) 2010 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 android.os; |
| |
| import com.android.ide.common.rendering.api.LayoutLog; |
| import com.android.layoutlib.bridge.Bridge; |
| import com.android.tools.layoutlib.annotations.LayoutlibDelegate; |
| |
| import java.util.LinkedList; |
| import java.util.WeakHashMap; |
| |
| /** |
| * Delegate overriding selected methods of android.os.Handler |
| * |
| * Through the layoutlib_create tool, selected methods of Handler have been replaced |
| * by calls to methods of the same name in this delegate class. |
| * |
| * |
| */ |
| public class Handler_Delegate { |
| |
| // -------- Delegate methods |
| private static WeakHashMap<Handler, LinkedList<Runnable>> sRunnablesMap = new WeakHashMap<>(); |
| |
| @LayoutlibDelegate |
| /*package*/ static boolean sendMessageAtTime(Handler handler, Message msg, long uptimeMillis) { |
| // get the callback |
| IHandlerCallback callback = sCallbacks.get(); |
| if (callback != null) { |
| callback.sendMessageAtTime(handler, msg, uptimeMillis); |
| } |
| return true; |
| } |
| |
| /** |
| * Current implementation of Compose uses {@link Handler#postAtFrontOfQueue} to execute state |
| * updates. We can not intercept postAtFrontOfQueue Compose calls, however we can intecept |
| * internal Handler calls. Since postAtFrontOfQueue is just a wrapper of |
| * sendMessageAtFrontOfQueue we re-define sendMessageAtFrontOfQueue here to catch Compose calls |
| * (we are only interested in them) and execute them. |
| * TODO(b/137794558): Clean/rework this when Compose reworks Handler usage. |
| */ |
| @LayoutlibDelegate |
| /*package*/ static boolean sendMessageAtFrontOfQueue(Handler handler, Message msg) { |
| // We will also catch calls from the Choreographer that have no callback. |
| if (msg.callback != null) { |
| LinkedList<Runnable> runnables = |
| sRunnablesMap.computeIfAbsent(handler, k -> new LinkedList<>()); |
| runnables.add(msg.callback); |
| } |
| |
| return true; |
| } |
| |
| // -------- Delegate implementation |
| /** |
| * Executed all the collected callbacks |
| * |
| * @return if there are more callbacks to execute |
| */ |
| public static boolean executeCallbacks() { |
| try { |
| while (sRunnablesMap.values().stream().anyMatch(runnables -> !runnables.isEmpty())) { |
| for (LinkedList<Runnable> runnables : sRunnablesMap.values()) { |
| while (!runnables.isEmpty()) { |
| Runnable r = runnables.poll(); |
| r.run(); |
| } |
| } |
| } |
| } catch (Throwable t) { |
| Bridge.getLog().error(LayoutLog.TAG_BROKEN, "Failed executing Handler callback", t, |
| null, null); |
| } |
| return false; |
| } |
| |
| public interface IHandlerCallback { |
| void sendMessageAtTime(Handler handler, Message msg, long uptimeMillis); |
| } |
| |
| private final static ThreadLocal<IHandlerCallback> sCallbacks = |
| new ThreadLocal<IHandlerCallback>(); |
| |
| public static void setCallback(IHandlerCallback callback) { |
| sCallbacks.set(callback); |
| } |
| |
| } |