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void main() { | |
final porta = Porta(PortaAberta()); | |
print(porta.estado); | |
porta.fechar(); | |
print(porta.estado); | |
porta.trancar(); | |
print(porta.estado); | |
porta.abrir(); | |
print(porta.estado); |
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import 'dart:async'; | |
import 'package:flutter/foundation.dart'; | |
import 'package:flutter/widgets.dart'; | |
/// Helper class to manage the state of a page/widget. </br> | |
class PageStateNotifier<Error extends Object?> | |
extends ChangeNotifier { | |
PageState _state = PageState.idle; |