flock 0.1.1

Coordinate Flutter widgets' states with event sourcing. What if Redux store contains no reducers, no state but only actions?

flock

Coordinate Flutter widgets' states with event sourcing.

Inspired by Redux.

Usage

import 'package:flock/flock.dart';

// Events
class E {}

class EA extends E {
  EA(this.value);

  final String value;
}

class EB extends E {
  EB(this.v);

  final int v;
}

// Store
final store = createStore<E>();

// Your projector

final projector = (int prev, EventStack<E> events, Projectable<E> store) {
  var result = prev ?? 0;
   // notice the events are in reverse chronological order
  for (var event in events) {
    if (event is EB)
      result += event.v;
    else if (event is EA)
      result -= int.tryParse(event.value) ?? 0;
  }
  return result;
};

// In you widget:

store.dispatch(EB(1));

store.subscribe((E e){
  final projection = store.getState(projector);
  // projection will be 1
});

//or

class BW extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return StoreBuilder( 
      build: (BuildContext context, int p) => Text(
            '$p',
            textDirection: TextDirection.ltr,
          ),
      store: store, // receive store from wherever you like
      projector: projector, // you can also provide a method as projector
    );
  }
}

Limits

This is still an early WIP. The future plan includes:

• better Flutter integration
• serialization & time travel support

License

MIT