main.dart

class CounterPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final CounterBloc counterBloc = BlocProvider.of<CounterBloc>(context);

    return Scaffold(
      appBar: AppBar(title: Text('BLoC Demo')),
      body: BlocBuilder<CounterBloc, int>(builder: (context, count) {
        return Center(
            child:
                Column(mainAxisAlignment: MainAxisAlignment.center, children: [
          Text('$count', style: TextStyle(fontSize: 32.0)),
          RaisedButton(
              child: Icon(Icons.add),
              onPressed: () {
                counterBloc.add(CounterEvent.increment);
              }),
          RaisedButton(
              child: Icon(Icons.remove),
              onPressed: () {
                counterBloc.add(CounterEvent.decrement);
              })
        ]));
      }),
    );
  }
}