reversible_bloc 0.0.2

A bloc mixin that enables to rollback states.

example/lib/main.dart

import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:reversible_bloc_example/cubit/my_counter_cubit.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  MyHomePage({Key? key}) : super(key: key);

  final _counterCubit = MyCounterCubit();

  void _incrementCounter() {
    _counterCubit.increment();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Reversible Cubit'),
      ),
      body: BlocProvider.value(
        value: _counterCubit,
        child: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              const Text(
                'You have pushed the button this many times:',
              ),
              BlocBuilder<MyCounterCubit, int>(
                bloc: _counterCubit,
                builder: (context, counter) {
                  return Text(
                    '$counter',
                    style: Theme.of(context).textTheme.headline4,
                  );
                },
              ),
              ElevatedButton(
                child: const Text('Revert state'),
                onPressed: _counterCubit.revert,
              ),
            ],
          ),
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ),
    );
  }
}