https://github.com/aloisdeniel/built_bloc

Generate the BLoC pattern boilerplate.
https://github.com/aloisdeniel/built_bloc

bloc dart flutter generator pattern

Last synced: 11 days ago
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Generate the BLoC pattern boilerplate.

• Host: GitHub
• URL: https://github.com/aloisdeniel/built_bloc
• Owner: aloisdeniel
• License: mit
• Created: 2019-01-15T08:21:45.000Z (almost 6 years ago)
• Default Branch: master
• Last Pushed: 2020-10-27T15:05:37.000Z (about 4 years ago)
• Last Synced: 2024-10-11T22:42:58.604Z (27 days ago)
• Topics: bloc, dart, flutter, generator, pattern
• Language: Dart
• Size: 119 KB
• Stars: 51
• Watchers: 3
• Forks: 5
• Open Issues: 6
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# built_bloc 

Generate the BLoC pattern boilerplate.

## Why ?

After using the [BLoC pattern](https://medium.com/flutter-io/build-reactive-mobile-apps-in-flutter-companion-article-13950959e381) a little, it seems pretty cool for sharing code and separation of concerns, but I quickly found myself to write a **lot of repetitive boilerplate code** : I felt the need for a generator to assist me.

Here is a simple vanilla bloc example which obviously highlights repeated patterns while declaring subjects, streams, sinks and subscriptions.

```dart

class VanillaExampleBloc {

  Sink get reset => this._reset.sink;

  Sink get add => this._add.sink;

  Stream get count => this._count.stream;

  final PublishSubject _add = PublishSubject();

  final PublishSubject _reset = PublishSubject();

  final BehaviorSubject _count = BehaviorSubject.seeded(0);

  List subscriptions;

  List subjects;

  VanillaExampleBloc() {

    subscriptions = [

      this._add.listen(_onAdd),

      this._reset.listen(_onReset),

    ];

    subjects = [

      this._add,

      this._count,

      this._reset,

    ];

  }

  void _onAdd(int value) {

    this._count.add(this._count.value + value);

  }

  void _onReset(int value) {

    this._count.add(0);

  }

  @mustCallSuper

  void dispose() {

    this.subjects.forEach((s) => s.close());

    this.subscriptions.forEach((s) => s.cancel());

  }

}

```

With **built_bloc**, you can replace all of that with just a few lines of code :

```dart

@bloc

class ExampleBloc extends Bloc with _ExampleBloc {

  @stream

  final BehaviorSubject _count = BehaviorSubject(seedValue: 0);

  @sink

  @Bind("_onAdd")

  final PublishSubject _add = PublishSubject();

  @sink

  @Bind("_onReset")

  final PublishSubject _reset = PublishSubject();

  void _onAdd(int value) {

    this._count.add(this._count.value + value);

  }

  void _onReset() {

    this._count.add(0);

  }

}

```

## How to use ?

See the [built_bloc_generator](https://pub.dartlang.org/packages/built_bloc_generator) package.