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.inputconsumers;
  
  import static android.view.MotionEvent.ACTION_CANCEL;
  import static android.view.MotionEvent.ACTION_DOWN;
  import static android.view.MotionEvent.ACTION_MOVE;
  import static android.view.MotionEvent.ACTION_POINTER_DOWN;
  import static android.view.MotionEvent.ACTION_POINTER_UP;
  import static android.view.MotionEvent.ACTION_UP;
  
  import static com.android.launcher3.Utilities.squaredHypot;
  import static com.android.launcher3.userevent.nano.LauncherLogProto.Action.Direction.UPLEFT;
  import static com.android.launcher3.userevent.nano.LauncherLogProto.Action.Direction.UPRIGHT;
  import static com.android.launcher3.userevent.nano.LauncherLogProto.Action.Touch.FLING;
  import static com.android.launcher3.userevent.nano.LauncherLogProto.Action.Touch.SWIPE;
  import static com.android.launcher3.userevent.nano.LauncherLogProto.Action.Touch.SWIPE_NOOP;
  import static com.android.launcher3.userevent.nano.LauncherLogProto.ContainerType.NAVBAR;
  
  import android.animation.ValueAnimator;
  import android.content.Context;
  import android.content.res.Resources;
  import android.graphics.PointF;
  import android.os.Bundle;
  import android.os.RemoteException;
  import android.os.SystemClock;
  import android.util.Log;
  import android.view.GestureDetector;
  import android.view.GestureDetector.SimpleOnGestureListener;
  import android.view.HapticFeedbackConstants;
  import android.view.MotionEvent;
  import android.view.ViewConfiguration;
  
  import com.android.launcher3.BaseDraggingActivity;
  import com.android.launcher3.R;
  import com.android.launcher3.anim.Interpolators;
  import com.android.launcher3.logging.UserEventDispatcher;
  import com.android.quickstep.ActivityControlHelper;
  import com.android.systemui.shared.recents.ISystemUiProxy;
  import com.android.systemui.shared.system.InputMonitorCompat;
  
  /**
   * Touch consumer for handling events to launch assistant from launcher
   */
  public class AssistantTouchConsumer extends DelegateInputConsumer {
  
      private static final String TAG = "AssistantTouchConsumer";
      private static final long RETRACT_ANIMATION_DURATION_MS = 300;
  
      // From //java/com/google/android/apps/gsa/search/shared/util/OpaContract.java.
      private static final String OPA_BUNDLE_TRIGGER = "triggered_by";
      // From //java/com/google/android/apps/gsa/assistant/shared/proto/opa_trigger.proto.
      private static final int OPA_BUNDLE_TRIGGER_DIAG_SWIPE_GESTURE = 83;
      private static final String INVOCATION_TYPE_KEY = "invocation_type";
      private static final int INVOCATION_TYPE_GESTURE = 1;
  
      private final PointF mDownPos = new PointF();
      private final PointF mLastPos = new PointF();
      private final PointF mStartDragPos = new PointF();
  
      private int mActivePointerId = -1;
      private boolean mPassedSlop;
      private boolean mLaunchedAssistant;
      private float mDistance;
      private float mTimeFraction;
      private long mDragTime;
      private float mLastProgress;
      private int mDirection;
      private ActivityControlHelper mActivityControlHelper;
  
      private final float mDragDistThreshold;
      private final float mFlingDistThreshold;
      private final long mTimeThreshold;
      private final int mAngleThreshold;
      private final float mSquaredSlop;
      private final ISystemUiProxy mSysUiProxy;
      private final Context mContext;
      private final GestureDetector mGestureDetector;
  
      public AssistantTouchConsumer(Context context, ISystemUiProxy systemUiProxy,
              ActivityControlHelper activityControlHelper, InputConsumer delegate,
              InputMonitorCompat inputMonitor) {
          super(delegate, inputMonitor);
          final Resources res = context.getResources();
          mContext = context;
          mSysUiProxy = systemUiProxy;
          mDragDistThreshold = res.getDimension(R.dimen.gestures_assistant_drag_threshold);
          mFlingDistThreshold = res.getDimension(R.dimen.gestures_assistant_fling_threshold);
          mTimeThreshold = res.getInteger(R.integer.assistant_gesture_min_time_threshold);
          mAngleThreshold = res.getInteger(R.integer.assistant_gesture_corner_deg_threshold);
  
          float slop = ViewConfiguration.get(context).getScaledTouchSlop();
  
          mSquaredSlop = slop * slop;
          mActivityControlHelper = activityControlHelper;
  
          mGestureDetector = new GestureDetector(context, new AssistantGestureListener());
      }
  
      @Override
      public int getType() {
          return TYPE_ASSISTANT | mDelegate.getType();
      }
  
      @Override
      public void onMotionEvent(MotionEvent ev) {
          // TODO add logging
          switch (ev.getActionMasked()) {
              case ACTION_DOWN: {
                  mActivePointerId = ev.getPointerId(0);
                  mDownPos.set(ev.getX(), ev.getY());
                  mLastPos.set(mDownPos);
                  mTimeFraction = 0;
                  break;
              }
              case ACTION_POINTER_DOWN: {
                  if (mState != STATE_ACTIVE) {
                      mState = STATE_DELEGATE_ACTIVE;
                      break;
                  }
              }
              case ACTION_POINTER_UP: {
                  int ptrIdx = ev.getActionIndex();
                  int ptrId = ev.getPointerId(ptrIdx);
                  if (ptrId == mActivePointerId) {
                      final int newPointerIdx = ptrIdx == 0 ? 1 : 0;
                      mDownPos.set(
                          ev.getX(newPointerIdx) - (mLastPos.x - mDownPos.x),
                          ev.getY(newPointerIdx) - (mLastPos.y - mDownPos.y));
                      mLastPos.set(ev.getX(newPointerIdx), ev.getY(newPointerIdx));
                      mActivePointerId = ev.getPointerId(newPointerIdx);
                  }
                  break;
              }
              case ACTION_MOVE: {
                  if (mState == STATE_DELEGATE_ACTIVE) {
                      break;
                  }
                  if (!mDelegate.allowInterceptByParent()) {
                      mState = STATE_DELEGATE_ACTIVE;
                      break;
                  }
                  int pointerIndex = ev.findPointerIndex(mActivePointerId);
                  if (pointerIndex == -1) {
                      break;
                  }
                  mLastPos.set(ev.getX(pointerIndex), ev.getY(pointerIndex));
  
                  if (!mPassedSlop) {
                      // Normal gesture, ensure we pass the slop before we start tracking the gesture
                      if (squaredHypot(mLastPos.x - mDownPos.x, mLastPos.y - mDownPos.y)
                              > mSquaredSlop) {
  
                          mPassedSlop = true;
                          mStartDragPos.set(mLastPos.x, mLastPos.y);
                          mDragTime = SystemClock.uptimeMillis();
  
                          if (isValidAssistantGestureAngle(
                              mDownPos.x - mLastPos.x, mDownPos.y - mLastPos.y)) {
                              setActive(ev);
                          } else {
                              mState = STATE_DELEGATE_ACTIVE;
                          }
                      }
                  } else {
                      // Movement
                      mDistance = (float) Math.hypot(mLastPos.x - mStartDragPos.x,
                          mLastPos.y - mStartDragPos.y);
                      if (mDistance >= 0) {
                          final long diff = SystemClock.uptimeMillis() - mDragTime;
                          mTimeFraction = Math.min(diff * 1f / mTimeThreshold, 1);
                          updateAssistantProgress();
                      }
                  }
                  break;
              }
              case ACTION_CANCEL:
              case ACTION_UP:
                  if (mState != STATE_DELEGATE_ACTIVE && !mLaunchedAssistant) {
                      ValueAnimator animator = ValueAnimator.ofFloat(mLastProgress, 0)
                          .setDuration(RETRACT_ANIMATION_DURATION_MS);
                      UserEventDispatcher.newInstance(mContext).logActionOnContainer(
                          SWIPE_NOOP, mDirection, NAVBAR);
                      animator.addUpdateListener(valueAnimator -> {
                          float progress = (float) valueAnimator.getAnimatedValue();
                          try {
  
                              mSysUiProxy.onAssistantProgress(progress);
                          } catch (RemoteException e) {
                              Log.w(TAG, "Failed to send SysUI start/send assistant progress: "
                                  + progress, e);
                          }
                      });
                      animator.setInterpolator(Interpolators.DEACCEL_2);
                      animator.start();
                  }
                  mPassedSlop = false;
                  mState = STATE_INACTIVE;
                  break;
          }
  
          mGestureDetector.onTouchEvent(ev);
  
          if (mState != STATE_ACTIVE) {
              mDelegate.onMotionEvent(ev);
          }
      }
  
      private void updateAssistantProgress() {
          if (!mLaunchedAssistant) {
              mLastProgress = Math.min(mDistance * 1f / mDragDistThreshold, 1) * mTimeFraction;
              try {
                  if (mDistance >= mDragDistThreshold && mTimeFraction >= 1) {
                      mSysUiProxy.onAssistantGestureCompletion(0);
                      startAssistantInternal(SWIPE);
  
                      Bundle args = new Bundle();
                      args.putInt(OPA_BUNDLE_TRIGGER, OPA_BUNDLE_TRIGGER_DIAG_SWIPE_GESTURE);
                      args.putInt(INVOCATION_TYPE_KEY, INVOCATION_TYPE_GESTURE);
                      mSysUiProxy.startAssistant(args);
                      mLaunchedAssistant = true;
                  } else {
                      mSysUiProxy.onAssistantProgress(mLastProgress);
                  }
              } catch (RemoteException e) {
                  Log.w(TAG, "Failed to send SysUI start/send assistant progress: " + mLastProgress,
                      e);
              }
          }
      }
  
      private void startAssistantInternal(int gestureType) {
          UserEventDispatcher.newInstance(mContext)
              .logActionOnContainer(gestureType, mDirection, NAVBAR);
  
          BaseDraggingActivity launcherActivity = mActivityControlHelper
              .getCreatedActivity();
          if (launcherActivity != null) {
              launcherActivity.getRootView().performHapticFeedback(
                  13, // HapticFeedbackConstants.GESTURE_END
                  HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING);
          }
      }
  
      /**
       * Determine if angle is larger than threshold for assistant detection
       */
      private boolean isValidAssistantGestureAngle(float deltaX, float deltaY) {
          float angle = (float) Math.toDegrees(Math.atan2(deltaY, deltaX));
          mDirection = angle > 90 ? UPLEFT : UPRIGHT;
  
          // normalize so that angle is measured clockwise from horizontal in the bottom right corner
          // and counterclockwise from horizontal in the bottom left corner
          angle = angle > 90 ? 180 - angle : angle;
          return (angle > mAngleThreshold && angle < 90);
      }
  
      private class AssistantGestureListener extends SimpleOnGestureListener {
          @Override
          public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
              if (isValidAssistantGestureAngle(velocityX, -velocityY)
                  && mDistance >= mFlingDistThreshold
                  && !mLaunchedAssistant
                  && mState != STATE_DELEGATE_ACTIVE) {
                  mLastProgress = 1;
                  try {
                      mSysUiProxy.onAssistantGestureCompletion(
                          (float) Math.sqrt(velocityX * velocityX + velocityY * velocityY));
                      startAssistantInternal(FLING);
  
                      Bundle args = new Bundle();
                      args.putInt(INVOCATION_TYPE_KEY, INVOCATION_TYPE_GESTURE);
                      mSysUiProxy.startAssistant(args);
                      mLaunchedAssistant = true;
                  } catch (RemoteException e) {
                      Log.w(TAG,
                          "Failed to send SysUI start/send assistant progress: " + mLastProgress,
                          e);
                  }
              }
              return true;
          }
      }
  }
  