content: /*
   * 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.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.animation.Animator;
  import android.animation.AnimatorListenerAdapter;
  import android.animation.AnimatorSet;
  import android.annotation.TargetApi;
  import android.content.Context;
  import android.os.Build;
  import android.os.SystemClock;
  import android.util.Log;
  import android.view.ViewConfiguration;
  
  import com.android.launcher3.BaseDraggingActivity;
  import com.android.launcher3.logging.UserEventDispatcher;
  import com.android.launcher3.testing.TestProtocol;
  import com.android.launcher3.userevent.nano.LauncherLogProto;
  import com.android.quickstep.ActivityControlHelper.ActivityInitListener;
  import com.android.quickstep.views.RecentsView;
  import com.android.quickstep.views.TaskView;
  import com.android.systemui.shared.system.ActivityManagerWrapper;
  import com.android.systemui.shared.system.LatencyTrackerCompat;
  import com.android.systemui.shared.system.RemoteAnimationTargetCompat;
  
  /**
   * 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(triggeredFromAltTab));
      }
  
      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 {
  
          private final boolean mTriggeredFromAltTab;
  
          ShowRecentsCommand(boolean triggeredFromAltTab) {
              mTriggeredFromAltTab = triggeredFromAltTab;
          }
  
          @Override
          protected boolean handleCommand(long elapsedTime) {
              // TODO: Go to the next page if started from alt-tab.
              return mHelper.getVisibleRecentsView() != null;
          }
  
          @Override
          protected void onTransitionComplete() {
              // TODO(b/138729100) This doesn't execute first time launcher is run
              if (mTriggeredFromAltTab) {
                  RecentsView rv = (RecentsView) mHelper.getVisibleRecentsView();
                  if (rv == null) {
                      return;
                  }
  
                  // Ensure that recents view has focus so that it receives the followup key inputs
                  TaskView taskView = rv.getNextTaskView();
                  if (taskView == null) {
                      if (rv.getTaskViewCount() > 0) {
                          taskView = rv.getTaskViewAt(0);
                          taskView.requestFocus();
                      } else {
                          rv.requestFocus();
                      }
                  } else {
                      taskView.requestFocus();
                  }
              }
          }
      }
  
      private class HideRecentsCommand extends RecentsActivityCommand {
  
          @Override
          protected boolean handleCommand(long elapsedTime) {
              RecentsView recents = (RecentsView) mHelper.getVisibleRecentsView();
              if (recents == null) {
                  return false;
              }
              int currentPage = recents.getNextPage();
              if (currentPage >= 0 && currentPage < recents.getTaskViewCount()) {
                  ((TaskView) recents.getPageAt(currentPage)).launchTask(true);
              } else {
                  recents.startHome();
              }
              return true;
          }
      }
  
      private class RecentsActivityCommand<T extends BaseDraggingActivity> implements Runnable {
  
          protected final ActivityControlHelper<T> mHelper;
          private final long mCreateTime;
          private final AppToOverviewAnimationProvider<T> mAnimationProvider;
  
          private final long mToggleClickedTime = SystemClock.uptimeMillis();
          private boolean mUserEventLogged;
          private ActivityInitListener mListener;
  
          public RecentsActivityCommand() {
              mHelper = mOverviewComponentObserver.getActivityControlHelper();
              mCreateTime = SystemClock.elapsedRealtime();
              mAnimationProvider =
                      new AppToOverviewAnimationProvider<>(mHelper, RecentsModel.getRunningTaskId());
  
              // 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(this::onTransitionComplete)) {
                  // If successfully switched, then return
                  return;
              }
  
              // Otherwise, start overview.
              mListener = mHelper.createActivityInitListener(this::onActivityReady);
              mListener.registerAndStartActivity(mOverviewComponentObserver.getOverviewIntent(),
                      this::createWindowAnimation, mContext, MAIN_EXECUTOR.getHandler(),
                      mAnimationProvider.getRecentsLaunchDuration());
          }
  
          protected boolean handleCommand(long elapsedTime) {
              // TODO: We need to fix this case with PIP, when an activity first enters PIP, it shows
              //       the menu activity which takes window focus, preventing the right condition from
              //       being run below
              RecentsView recents = mHelper.getVisibleRecentsView();
              if (recents != null) {
                  // Launch the next task
                  recents.showNextTask();
                  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;
          }
  
          private boolean onActivityReady(T activity, Boolean wasVisible) {
              if (!mUserEventLogged) {
                  activity.getUserEventDispatcher().logActionCommand(
                          LauncherLogProto.Action.Command.RECENTS_BUTTON,
                          mHelper.getContainerType(),
                          LauncherLogProto.ContainerType.TASKSWITCHER);
                  mUserEventLogged = true;
              }
              return mAnimationProvider.onActivityReady(activity, wasVisible);
          }
  
          private AnimatorSet createWindowAnimation(RemoteAnimationTargetCompat[] targetCompats) {
              if (LatencyTrackerCompat.isEnabled(mContext)) {
                  LatencyTrackerCompat.logToggleRecents(
                          (int) (SystemClock.uptimeMillis() - mToggleClickedTime));
              }
  
              mListener.unregister();
  
              AnimatorSet animatorSet = mAnimationProvider.createWindowAnimation(targetCompats);
              animatorSet.addListener(new AnimatorListenerAdapter() {
                  @Override
                  public void onAnimationEnd(Animator animation) {
                      onTransitionComplete();
                  }
              });
              return animatorSet;
          }
  
          protected void onTransitionComplete() { }
      }
  }
  