watch<U> method
void
watch<U>(])
Implementation
@protected
@nonVirtual
@mustCallSuper
void watch<U>(Stream<U> stream, [FutureOr<void> Function(U data)? onData]) {
if (this._watches.containsKey(stream)) return;
onData ??= (U data) {};
this._watches[stream] = stream.listen((event) async {
await onData!(event);
this.triggerStateChange();
});
}