bloc_generic_streams 2.0.0

A Flutter package to implement Didier Boelens's BlocProvider and simplified use of Stream using Dart's Generics.

Bloc Generic Streams

This package was create to be an easy implementation of Didier Boelens's BlocProvider and including a new way to use a BehaviorSubject using GenericStream class that creates an object more simple with Dart's Generics.

I built this package because when you have an application like an Uber application, which was my case, others bloc packages didn't attended my expectations, so, I created this, more simple and more intuitive. You only need to create your Bloc extending BlocBase and then creating a BlocProvider in whatever screen you desire.

Example:

    import 'package:bloc_generic_streams/bloc_generic_streams.dart';
    
    class HomeBloc extends BlocBase {
      int counter = 0;
      final GenericBehavior<int> counterStream = GenericBehavior<int>();

      final GenericPublish<int> publishSubject = GenericPublish<int>();

      final GenericReplay<int> publishSubject = GenericReplay<int>();
    
      void increment() {
        counterStream.sink(++counter);
      }
    
      @override
      void dispose() {
        counterStream?.dispose();
      }
    }

counterStream variable contains all most important methods exposed, like:

• sink (StreamSink)
• stream (ValueStream)
• stream debounce (1500 ms)

How to use BlocProvider?

class HomeScreen extends StatelessWidget {
      //Instantiate our bloc... HomeBloc in our case
      final HomeBloc _bloc = HomeBloc();
    
      @override
      Widget build(BuildContext context) {
        //Return a BlocProvider instance specifying its type
        return BlocProvider<HomeBloc>(
          blocBuilder: () => _bloc, // Build and create our bloc
          child: Scaffold(
            appBar: AppBar(title: Text('Home Screen')),
            floatingActionButton: FloatingActionButton(
              onPressed: _bloc.increment,
              child: Icon(Icons.add),
            ),
            body: Center(
              child: StreamBuilder<int>(
                initialData: _bloc.counter,
                //Retrieving Stream from _bloc's GenericStream object
                stream: _bloc.counterStream.stream,
                builder: (_, AsyncSnapshot<int> snapshot) {
                  return Text(
                    '${snapshot.data}',
                    style: Theme.of(context).textTheme.display1,
                  );
                },
              ),
            ),
          ),
        );
      }
    }

Now it's very easy to implement a BLoC class and to manipulate the way you want.

Retrieving Bloc

Follow the same pattern from other packages, like this:

final HomeBloc _bloc = BlocProvider.of<HomeBloc>(context);

With that, you can access and retrieved any stream/method inside your Bloc.