flutter_bloc_pattern 0.0.1+1

flutter_bloc_pattern #

Base class and provider for bloc in flutter

Getting Started #

This project is a starting point for a Dart package, a library module containing code that can be shared easily across multiple Flutter or Dart projects.

For help getting started with Flutter, view our online documentation, which offers tutorials, samples, guidance on mobile development, and a full API reference.

[0.0.1+1] - 8 February 2019

  • Add example

[0.0.1] - 8 February 2019

  • Initial


Simple example a port of the standard "Counter Button" example from Flutter


import 'package:flutter_bloc_pattern/flutter_bloc_pattern.dart';
import 'package:meta/meta.dart';
import 'package:rxdart/rxdart.dart';

//ignore_for_file: close_sinks
class CounterBloc implements BaseBloc {
  /// Inputs
  final void Function() increment;

  /// Outputs
  final ValueObservable<int> state;

  /// Clean up
  final void Function() _dispose;

    this._dispose, {
    @required this.increment,
    @required this.state,

  factory CounterBloc() {
    final incrementController = PublishSubject<void>();
    final state = incrementController
        .scan<int>((acc, _, __) => acc + 1, 0)
        .shareValue(seedValue: 0);

    return CounterBloc._(
      increment: () => incrementController.add(null),
      state: state,

  void dispose() => _dispose();


import 'package:counter/counter_bloc.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc_pattern/flutter_bloc_pattern.dart';

void main() {
      child: MyApp(),
      initBloc: () => CounterBloc(),

class MyApp extends StatelessWidget {
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData.dark(),
      home: const MyHomePage(),

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key key}) : super(key: key);

  _MyHomePageState createState() => _MyHomePageState();

class _MyHomePageState extends State<MyHomePage> {
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Home page'),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: const <Widget>[
            Text('You have pushed the button this many times:'),
          const IncrementButton(), // This trailing comma makes auto-formatting nicer for build methods.

class TextCounter extends StatelessWidget {
  const TextCounter({Key key}) : super(key: key);

  Widget build(BuildContext context) {
    final bloc = BlocProvider.of<CounterBloc>(context);
    return StreamBuilder<int>(
      stream: bloc.state,
      initialData: bloc.state.value,
      builder: (context, snapshot) {
        return Text(
          style: Theme.of(context).textTheme.display1,

class IncrementButton extends StatelessWidget {
  const IncrementButton({Key key}) : super(key: key);

  Widget build(BuildContext context) {
    final bloc = BlocProvider.of<CounterBloc>(context);
    return FloatingActionButton(
      onPressed: bloc.increment,
      tooltip: 'Increment',
      child: Icon(Icons.add),

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:

  flutter_bloc_pattern: ^0.0.1+1

2. Install it

You can install packages from the command line:

with Flutter:

$ flutter pub get

Alternatively, your editor might support flutter pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:flutter_bloc_pattern/flutter_bloc_pattern.dart';
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Learn more about scoring.

We analyzed this package on Jul 17, 2019, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.4.0
  • pana: 0.12.19
  • Flutter: 1.7.8+hotfix.3


Detected platforms: Flutter

References Flutter, and has no conflicting libraries.

Maintenance suggestions

The package description is too short. (-20 points)

Add more detail to the description field of pubspec.yaml. Use 60 to 180 characters to describe the package, what it does, and its target use case.

Package is pre-v0.1 release. (-10 points)

While nothing is inherently wrong with versions of 0.0.*, it might mean that the author is still experimenting with the general direction of the API.


Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.1.0 <3.0.0
flutter 0.0.0
Transitive dependencies
collection 1.14.11
meta 1.1.6 1.1.7
sky_engine 0.0.99
typed_data 1.1.6
vector_math 2.0.8
Dev dependencies
mockito ^4.0.0