OverscrollNotification constructor

OverscrollNotification({@required ScrollMetrics metrics, @required BuildContext context, DragUpdateDetails dragDetails, @required double overscroll, double velocity: 0.0 })

Creates a notification that a Scrollable widget has changed its scroll position outside of its scroll bounds.

Implementation 

OverscrollNotification({
  @required ScrollMetrics metrics,
  @required BuildContext context,
  this.dragDetails,
  @required this.overscroll,
  this.velocity = 0.0,
}) : assert(overscroll != null),
     assert(overscroll.isFinite),
     assert(overscroll != 0.0),
     assert(velocity != null),
     super(metrics: metrics, context: context);