didUpdateScrollMetrics method Null safety

void didUpdateScrollMetrics()

Dispatches a notification that the ScrollMetrics have changed.

Implementation

void didUpdateScrollMetrics() {
  assert(SchedulerBinding.instance.schedulerPhase != SchedulerPhase.persistentCallbacks);
  assert(_haveScheduledUpdateNotification);
  _haveScheduledUpdateNotification = false;
  if (context.notificationContext != null)
    ScrollMetricsNotification(metrics: copyWith(), context: context.notificationContext!).dispatch(context.notificationContext);
}