content: /*
   * Copyright (C) 2019 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.quickstep;
  
  import static com.android.launcher3.util.Executors.MAIN_EXECUTOR;
  import static com.android.systemui.shared.system.ActivityManagerWrapper.CLOSE_SYSTEM_WINDOWS_REASON_RECENTS;
  
  import android.annotation.TargetApi;
  import android.content.Context;
  import android.os.Build;
  import android.os.SystemClock;
  import android.view.ViewConfiguration;
  
  import com.android.launcher3.BaseDraggingActivity;
  import com.android.launcher3.logging.UserEventDispatcher;
  import com.android.launcher3.userevent.nano.LauncherLogProto;
  import com.android.quickstep.ActivityControlHelper.ActivityInitListener;
  import com.android.quickstep.AppToOverviewAnimationProvider.AppToOverviewAnimationListener;
  import com.android.quickstep.views.IconRecentsView;
  import com.android.systemui.shared.system.ActivityManagerWrapper;
  import com.android.systemui.shared.system.LatencyTrackerCompat;
  
  /**
   * Helper class to handle various atomic commands for switching between Overview.
   */
  @TargetApi(Build.VERSION_CODES.P)
  public class OverviewCommandHelper {
  
      private final Context mContext;
      private final ActivityManagerWrapper mAM;
      private final RecentsModel mRecentsModel;
      private final OverviewComponentObserver mOverviewComponentObserver;
  
      private long mLastToggleTime;
  
      public OverviewCommandHelper(Context context, OverviewComponentObserver observer) {
          mContext = context;
          mAM = ActivityManagerWrapper.getInstance();
          mRecentsModel = RecentsModel.INSTANCE.get(mContext);
          mOverviewComponentObserver = observer;
      }
  
      public void onOverviewToggle() {
          // If currently screen pinning, do not enter overview
          if (mAM.isScreenPinningActive()) {
              return;
          }
  
          mAM.closeSystemWindows(CLOSE_SYSTEM_WINDOWS_REASON_RECENTS);
          MAIN_EXECUTOR.execute(new RecentsActivityCommand<>());
      }
  
      public void onOverviewShown(boolean triggeredFromAltTab) {
          MAIN_EXECUTOR.execute(new ShowRecentsCommand());
      }
  
      public void onOverviewHidden() {
          MAIN_EXECUTOR.execute(new HideRecentsCommand());
      }
  
      public void onTip(int actionType, int viewType) {
          MAIN_EXECUTOR.execute(() ->
                  UserEventDispatcher.newInstance(mContext).logActionTip(actionType, viewType));
      }
  
      private class ShowRecentsCommand extends RecentsActivityCommand {
  
          @Override
          protected boolean handleCommand(long elapsedTime) {
              return mHelper.getVisibleRecentsView() != null;
          }
      }
  
      private class HideRecentsCommand extends RecentsActivityCommand {
  
          @Override
          protected boolean handleCommand(long elapsedTime) {
              IconRecentsView recents = (IconRecentsView) mHelper.getVisibleRecentsView();
              if (recents == null) {
                  return false;
              }
              recents.handleOverviewCommand();
              return true;
          }
      }
  
      private class RecentsActivityCommand<T extends BaseDraggingActivity> implements Runnable {
  
          protected final ActivityControlHelper<T> mHelper;
          private final long mCreateTime;
  
          private final long mToggleClickedTime = SystemClock.uptimeMillis();
          private boolean mUserEventLogged;
          private ActivityInitListener mListener;
  
          public RecentsActivityCommand() {
              mHelper = mOverviewComponentObserver.getActivityControlHelper();
              mCreateTime = SystemClock.elapsedRealtime();
  
              // Preload the plan
              mRecentsModel.getTasks(null);
          }
  
          @Override
          public void run() {
              long elapsedTime = mCreateTime - mLastToggleTime;
              mLastToggleTime = mCreateTime;
  
              if (handleCommand(elapsedTime)) {
                  // Command already handled.
                  return;
              }
  
              if (mHelper.switchToRecentsIfVisible(null /* onCompleteCallback */)) {
                  // If successfully switched, then return
                  return;
              }
  
              AppToOverviewAnimationProvider<T> provider =
                      new AppToOverviewAnimationProvider<>(mHelper, RecentsModel.getRunningTaskId());
              provider.setAnimationListener(
                      new AppToOverviewAnimationListener() {
                          @Override
                          public void onActivityReady(BaseDraggingActivity activity) {
                              if (!mUserEventLogged) {
                                  activity.getUserEventDispatcher().logActionCommand(
                                          LauncherLogProto.Action.Command.RECENTS_BUTTON,
                                          mHelper.getContainerType(),
                                          LauncherLogProto.ContainerType.TASKSWITCHER);
                                  mUserEventLogged = true;
                              }
                          }
  
                          @Override
                          public void onWindowAnimationCreated() {
                              if (LatencyTrackerCompat.isEnabled(mContext)) {
                                  LatencyTrackerCompat.logToggleRecents(
                                          (int) (SystemClock.uptimeMillis() - mToggleClickedTime));
                              }
  
                              mListener.unregister();
                          }
                      });
  
              // Otherwise, start overview.
              mListener = mHelper.createActivityInitListener(provider::onActivityReady);
              mListener.registerAndStartActivity(mOverviewComponentObserver.getOverviewIntent(),
                      provider, mContext, MAIN_EXECUTOR.getHandler(),
                      provider.getRecentsLaunchDuration());
          }
  
          protected boolean handleCommand(long elapsedTime) {
              IconRecentsView recents = mHelper.getVisibleRecentsView();
              if (recents != null) {
                  recents.handleOverviewCommand();
                  return true;
              } else if (elapsedTime < ViewConfiguration.getDoubleTapTimeout()) {
                  // The user tried to launch back into overview too quickly, either after
                  // launching an app, or before overview has actually shown, just ignore for now
                  return true;
              }
              return false;
          }
      }
  }
  