ScrollUpdateNotification constructor

ScrollUpdateNotification({@required ScrollMetrics metrics, @required BuildContext context, DragUpdateDetails dragDetails, double scrollDelta })

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

Implementation 

ScrollUpdateNotification({
  @required ScrollMetrics metrics,
  @required BuildContext context,
  this.dragDetails,
  this.scrollDelta,
}) : super(metrics: metrics, context: context);