MVVMP example

mvvmp_example.dart

import 'package:base/base.dart';
import 'package:flutter/material.dart';

class MyScreen extends StatefulWidget {
  @override
  _MyScreenState createState() => _MyScreenState();
}

class _MyScreenState extends BaseState<MyScreen, MyPresenter>
    with MyScreenActions {
  
  @override
  void initState() {
    super.initState();
    presenter.getAsyncName();
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      child: Center(
        child: StreamBuilder<String>(
          initialData: '',
          stream: presenter.name,
          builder: (context, snapshot) {
            return Text(snapshot.data);
          },
        ),
      ),
    );
  }
}

mixin MyScreenActions<T extends StatefulWidget> on State<T> {
  void showAlertError() {
    // show dialog here
  }
}

class MyPresenter extends BasePresenter<MyScreenActions> {
  
  final _name = BehaviorSubject<String>();
  Stream<String> get name => _name.stream;

  void getAsyncName() {
    
    Future.delayed(Duration(seconds: 3)).then((value) {
      _name.add('Async Name');
    }).onError((error, stackTrace) {
      view.showAlertError();
    });
  }

  @override
  void dispose() {
    _name.close();
    super.dispose();
  }
}