state_example_bloc.dart

import 'package:flutter/material.dart';
import 'package:bloc_lite/bloc_lite.dart';
import 'package:bloc_lite_flutter/bloc_lite_flutter.dart';

class ReactiveWidget extends StatefulWidget {
  @override
  State<StatefulWidget> createState() => ReactiveWidgetState();
}

class ReactiveWidgetState extends State<ReactiveWidget> {
  @override
  void initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return InheritedBloc(
      bloc: BlocState(),
      child: ReactiveWidgetChild(),
    );
  }
}

class ReactiveWidgetChild extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return BlocWidget<BlocState>.inherited(
      context: context,
      builder: (_, state) {
        return Center(
          child: Text(state.value.toString()),
        );
      }
    );
  }
}

class BlocState extends BlocController {
  int _value;

  BlocState() : _value = 0;

  int get value => _value;
  set value(int v) {
    _value = v;
    publishUpdate();
  }
}