content: package com.android.launcher3.uioverrides;
  
  import static com.android.launcher3.LauncherState.ALL_APPS;
  import static com.android.launcher3.LauncherState.NORMAL;
  
  import android.view.MotionEvent;
  
  import com.android.launcher3.AbstractFloatingView;
  import com.android.launcher3.Launcher;
  import com.android.launcher3.LauncherState;
  import com.android.launcher3.LauncherStateManager.AnimationComponents;
  import com.android.launcher3.touch.AbstractStateChangeTouchController;
  import com.android.launcher3.touch.SingleAxisSwipeDetector;
  import com.android.launcher3.userevent.nano.LauncherLogProto.ContainerType;
  
  /**
   * TouchController to switch between NORMAL and ALL_APPS state.
   */
  public class AllAppsSwipeController extends AbstractStateChangeTouchController {
  
      private MotionEvent mTouchDownEvent;
  
      public AllAppsSwipeController(Launcher l) {
          super(l, SingleAxisSwipeDetector.VERTICAL);
      }
  
      @Override
      protected boolean canInterceptTouch(MotionEvent ev) {
          if (ev.getAction() == MotionEvent.ACTION_DOWN) {
              mTouchDownEvent = ev;
          }
          if (mCurrentAnimation != null) {
              // If we are already animating from a previous state, we can intercept.
              return true;
          }
          if (AbstractFloatingView.getTopOpenView(mLauncher) != null) {
              return false;
          }
          if (!mLauncher.isInState(NORMAL) && !mLauncher.isInState(ALL_APPS)) {
              // Don't listen for the swipe gesture if we are already in some other state.
              return false;
          }
          if (mLauncher.isInState(ALL_APPS) && !mLauncher.getAppsView().shouldContainerScroll(ev)) {
              return false;
          }
          return true;
      }
  
      @Override
      protected LauncherState getTargetState(LauncherState fromState, boolean isDragTowardPositive) {
          if (fromState == NORMAL && isDragTowardPositive) {
              return ALL_APPS;
          } else if (fromState == ALL_APPS && !isDragTowardPositive) {
              return NORMAL;
          }
          return fromState;
      }
  
      @Override
      protected int getLogContainerTypeForNormalState(MotionEvent ev) {
          return mLauncher.getDragLayer().isEventOverView(mLauncher.getHotseat(), mTouchDownEvent) ?
                  ContainerType.HOTSEAT : ContainerType.WORKSPACE;
      }
  
      @Override
      protected float initCurrentAnimation(@AnimationComponents int animComponents) {
          float range = getShiftRange();
          long maxAccuracy = (long) (2 * range);
          mCurrentAnimation = mLauncher.getStateManager()
                  .createAnimationToNewWorkspace(mToState, maxAccuracy, animComponents);
          float startVerticalShift = mFromState.getVerticalProgress(mLauncher) * range;
          float endVerticalShift = mToState.getVerticalProgress(mLauncher) * range;
          float totalShift = endVerticalShift - startVerticalShift;
          return 1 / totalShift;
      }
  }
  