Template for BLoC using Counter example

counter_bloc.dart

import 'package:bloc/bloc.dart';
import 'package:freezed_annotation/freezed_annotation.dart';

part 'counter_bloc.freezed.dart';
part 'counter_event.dart';
part 'counter_state.dart';

typedef _Event = CounterEvent;
typedef _Emit = Emitter<CounterState>;

class CounterBloc extends Bloc<CounterEvent, CounterState> {
  CounterBloc() : super(const CounterState()) {
    on<Initial>(_initital);
    on<Increment>(_increment);
    on<Decrement>(_decrement);
    add(const Initial());
  }

  void _initital(_Event event, _Emit emit) {
    emit(state.copyWith(value: 100));
  }

  void _increment(_Event event, _Emit emit) {
    emit(state.copyWith(value: state.value + 1));
  }

  void _decrement(_Event event, _Emit emit) {
    emit(state.copyWith(value: state.value - 1));
  }
}

counter_event.dart

part of 'counter_bloc.dart';

@freezed
class CounterEvent with _$CounterEvent {
  const factory CounterEvent.initial() = Initial;
  const factory CounterEvent.increment() = Increment;
  const factory CounterEvent.decrement() = Decrement;
}

counter_state.dart

part of 'counter_bloc.dart';

@freezed
class CounterState with _$CounterState {
  const factory CounterState({
    @Default(0) int value,
  }) = _CounterState;
}

counter_view.dart

class CounterView extends StatelessWidget {
  const CounterView({super.key});

  @override
  Widget build(BuildContext context) {
    return MultiBlocProvider(
      providers: [
        BlocProvider(
          create: (_) => CounterBloc(),
        ),
      ],
      child: const _CounterView(),
    );
  }
}

class _CounterView extends StatelessWidget {
  const _CounterView();

  @override
  Widget build(BuildContext context) {
    final bloc = context.watch<CounterBloc>();

    return Scaffold(
      body: Center(
        child: Column(
          children: [
            Text('${bloc.state.value}'),
          ],
        ),
      ),
      floatingActionButton: Column(
        mainAxisAlignment: MainAxisAlignment.end,
        crossAxisAlignment: CrossAxisAlignment.end,
        children: [
          FloatingActionButton(
            onPressed: () => bloc.add(const Increment()),
            child: const Icon(Icons.add),
          ),
          const SizedBox(height: 8),
          FloatingActionButton(
            onPressed: () => bloc.add(const Decrement()),
            child: const Icon(Icons.remove),
          ),
        ],
      ),
    );
  }
}