build method
Subclasses should override this function to actually call the appropriate
build function (e.g., StatelessWidget.build or State.build) for
their widget.
Implementation
@override
Widget build() {
for (final disposer in disposers!) {
disposer();
}
disposers!.clear();
return Notifier.instance.append(
NotifyData(disposers: disposers!, updater: getUpdate),
super.build,
);
}