public boolean onTouch()

in firebase-inappmessaging-display/src/main/java/com/google/firebase/inappmessaging/display/internal/SwipeDismissTouchListener.java [126:241]
99 lines of code
24 McCabe index (conditional complexity)

  public boolean onTouch(View view, MotionEvent motionEvent) {
    // offset because the view is translated during swipe
    motionEvent.offsetLocation(mTranslationX, 0);

    if (mViewWidth < 2) {
      mViewWidth = mView.getWidth();
    }

    switch (motionEvent.getActionMasked()) {
      case MotionEvent.ACTION_DOWN:
        {
          // TODO: ensure this is a finger, and set a flag
          mDownX = motionEvent.getRawX();
          mDownY = motionEvent.getRawY();
          if (mDismissCallbacks.canDismiss(mToken)) {
            mVelocityTracker = VelocityTracker.obtain();
            mVelocityTracker.addMovement(motionEvent);
          }
          return false;
        }

      case MotionEvent.ACTION_UP:
        {
          if (mVelocityTracker == null) {
            break;
          }

          float deltaX = motionEvent.getRawX() - mDownX;
          mVelocityTracker.addMovement(motionEvent);
          mVelocityTracker.computeCurrentVelocity(1000);
          float velocityX = mVelocityTracker.getXVelocity();
          float absVelocityX = Math.abs(velocityX);
          float absVelocityY = Math.abs(mVelocityTracker.getYVelocity());
          boolean dismiss = false;
          boolean dismissRight = false;
          if (Math.abs(deltaX) > mViewWidth / 2 && mSwiping) {
            dismiss = true;
            dismissRight = deltaX > 0;
          } else if (mMinFlingVelocity <= absVelocityX
              && absVelocityX <= mMaxFlingVelocity
              && absVelocityY < absVelocityX
              && absVelocityY < absVelocityX
              && mSwiping) {
            // dismiss only if flinging in the same direction as dragging
            dismiss = (velocityX < 0) == (deltaX < 0);
            dismissRight = mVelocityTracker.getXVelocity() > 0;
          }
          if (dismiss) {
            // dismiss
            startDismissAnimation(dismissRight);
          } else if (mSwiping) {
            // cancel
            startCancelAnimation();
          }

          if (mVelocityTracker != null) {
            mVelocityTracker.recycle();
          }
          mVelocityTracker = null;
          mTranslationX = 0;
          mDownX = 0;
          mDownY = 0;
          mSwiping = false;
          break;
        }

      case MotionEvent.ACTION_CANCEL:
        {
          if (mVelocityTracker == null) {
            break;
          }
          startCancelAnimation();
          mVelocityTracker.recycle();
          mVelocityTracker = null;
          mTranslationX = 0;
          mDownX = 0;
          mDownY = 0;
          mSwiping = false;
          break;
        }

      case MotionEvent.ACTION_MOVE:
        {
          if (mVelocityTracker == null) {
            break;
          }

          mVelocityTracker.addMovement(motionEvent);
          float deltaX = motionEvent.getRawX() - mDownX;
          float deltaY = motionEvent.getRawY() - mDownY;
          if (Math.abs(deltaX) > mSlop && Math.abs(deltaY) < Math.abs(deltaX) / 2) {
            mSwiping = true;
            mSwipingSlop = (deltaX > 0 ? mSlop : -mSlop);
            mView.getParent().requestDisallowInterceptTouchEvent(true);

            // Cancel listview's touch
            MotionEvent cancelEvent = MotionEvent.obtain(motionEvent);
            cancelEvent.setAction(
                MotionEvent.ACTION_CANCEL
                    | (motionEvent.getActionIndex() << MotionEvent.ACTION_POINTER_INDEX_SHIFT));
            mView.onTouchEvent(cancelEvent);
            cancelEvent.recycle();
          }

          if (mSwiping) {
            mTranslationX = deltaX;
            setTranslationX(deltaX - mSwipingSlop);
            // TODO: use an ease-out interpolator or such
            setAlpha(Math.max(0f, Math.min(1f, 1f - 2f * Math.abs(deltaX) / mViewWidth)));
            return true;
          }
          break;
        }
    }
    return false;
  }