handleNotification method

bool handleNotification(ScrollNotification notification)

Implementation

bool handleNotification(ScrollNotification notification) {

  if (notification.depth == 0) {
    return false;
  }

  if (notification is ScrollStartNotification) {
    dragStartDetails = notification.dragDetails;
  }

  if (notification is OverscrollNotification) {
    if (_drag == null) {
      ScrollPositionWithSingleContext a =
          pageController.position as ScrollPositionWithSingleContext;
      _drag = a.drag(dragStartDetails!, () {
        _drag = null;
      }) as ScrollDragController;
    }

    if (notification.dragDetails != null) {
      _drag?.update(notification.dragDetails!);
    }
  }

  if (notification is ScrollUpdateNotification) {
    return false;
  }

  if (notification is ScrollEndNotification) {
    dragStartDetails = null;
    if (notification.dragDetails != null) {
      _drag?.end(notification.dragDetails!);
    }
  }

  if (notification is UserScrollNotification) {
    switch (notification.direction) {
      case ScrollDirection.forward:
        break;
      case ScrollDirection.idle:
        _drag?.cancel();
        break;
      case ScrollDirection.reverse:
        break;
    }
  }
  return false;
}