module_provider 1.3.1

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module_provider #

This package facilitates the creation of applications in the module structure, with service injection, components and state management.

import 'package:module_provider/module_provider.dart';

Below I will explain how Module,Service, Component andController are used, and then we will explain how to use the state management classes withValueProvider, ValuesProvider andServiceConsumer and also how to consume these values, ​​and be notified whenever there are any changes to these values.

Module #

The Module contains the basic structure with services, submodules, and components, keeping services instances. When the module is disposed, all services are also disposed.

On main.dart, I informed that the AppModule is my root module, how much the module is create, the widget informed in build method is returned.

import 'package:flutter/material.dart';
import 'package:app_module.dart';

void main() => runApp(AppModule());

In app_module.dart, I created my module structure, withServices and Components, and in thebuild method, HomeComponent is returned for display on the screen.

import 'package:flutter/material.dart';

class AppModule extends Module {
  List<Inject<Service>> get services => [
    Inject((m, arg) => AppService(m)),
    Inject((m, arg) => DataService(m)),

  List<Inject<Component>> get components => [
    Inject((m, arg) => HomeComponent()),
    Inject((m, arg) => TaskListComponent()),
    Inject((m, arg) => AddEditTaskComponent()),

  initialize(BuildContext context) {

  Widget build(BuildContext context) => component<HomeComponent>();

Optionally, if you need to initialize something on Module initialize, override the initialize() method in Module.

Service #

The Service provide functions and properties to components, submodules and other services, he is created and maintained in memory until module be disposed.

In app_service.dart, I created the AppService and declared the darkMode property of typebool that defines whether the app will be built in dark mode or not.

class AppService extends Service {
  bool _darkMode = false;
  bool get darkMode => _darkMode;

  final ValueProvider<int> counter = ValueProvider(initialValue: 0);

  AppService(Module module) : super(module);

  changeDarkMode() {
    _darkMode = !_darkMode;

  incrementCounter() {

When changeDarkMode() is called, the darkMode property is changed and notifyListeners() is called to notify all consumers.

Component #

The Components are extended StatefulWidget widgets, but simpler, it is not necessary to create aStatefulWidget and State class, and usually have an associated Controller to maintain the state of the component.

class HomeComponent extends Component<HomeController> {
  initController(BuildContext context, Module module) => HomeController(module);

  Widget build(BuildContext context, Module module, HomeController controller) { 
    /// return Scaffold(....

Controller #

The Controller is used together a Component to keep the logic and state separate from the component, leaving component solely responsible for the layout.

class HomeController extends Controller {
  final ValueProvider<int> counter = ValueProvider(initialValue: 0);

  HomeController(Module module) : super(module);

  increment() {

State Management Classes #

ValueProvider / ValueConsumer #

Simple class to notify listeners when value is changed.

ValueProvider<String> description = ValueProvider(initialValue: 'Initial Description');

You can modify value setting property 'value' or calling method 'setValue'.

description.value = 'Another Description';
description.setValue('Another Description');

Example to consume this value. In this case, when changing the description value, the Text Widget is rebuilt and shows the new value.

  provider: description,
  builder: (context, value) => Text(value)

ValuesProvider / ValuesConsumer #

Controlling multiple values and ValueProvider.

In the bellow example , is declared 'packageInfo' with the values 'name' os type String and value 'version' of type ValueProvider

ValuesProvider packageInfo = ValuesProvider({
  'name': 'package_name',
  'version': ValueProvider<String>(initialValue: ''),

To update the values on ValuesProvider use 'setValues' method passing a Map<String, dynamic>, and to update a single value, use 'setValue' with 'fieldName' and 'newValue' arguments.

  'name': 'module_provider',
  'version': '1.0.0'

Example for consume all values of the ValuesProvider.

  provider: packageInfo,
  builder: (context, values) => Column() {
    childs: Widget[] {

Example for consume a ValueProvider in the ValuesProvider.

    provider: packageInfo.getValueProvider('version'),
    builder: (context, value) => Text(value)

ServiceConsumer #

The 'ServiceConsumer' is used for consume an specfically service declared in the 'Module', and receive notifications when state of service is changed.

For example, you have a 'darkMode' property of type bool in the 'Service', and on change this property, yout application need build again to set your application to dark mode.

      builder: (context, service) {

        return MaterialApp(
          title: 'Task List',
          theme: ThemeData(
            brightness: (service.darkMode ? Brightness.dark : Brightness.light),
          initialRoute: Page.home,
          routes: {
            Page.home: (context) => component<HomeComponent>(),
            Page.addEdit: (context) => component<AddEditTaskComponent>(),


1.3.1 #

  • Replaced inheritFromWidgetOfExactType deprecated method by dependOnInheritedWidgetOfExactType.

1.3.0 #

  • Added operator [] in ValuesProvider to get values.

1.3.0 #

  • Added initialize() method in Component to allow the user to initialize something at Component initialization, this method is called only once before the build() method.

1.2.0 #

  • Added initialize() method in Module to allow the user to initialize something at Module initialization, this method is called only once before the build() method.

1.1.0+3 #

  • Removed '{@tool sample}' and '{@end-tool}' from documentation.

1.1.0+2 #

  • Added documentation for package classes.
  • Renamed parameter value in ValuesProvider method build() to values.
  • Moved the inject_manager.dart file to the 'classes' folder.

1.1.0+1 #

  • Updated with another examples and descriptions.

1.1.0 #

  • Removed Module parameter from the ValueConsumer and ServiceConsumer.
  • Defined to consumers return direct the value in build function.
  • Added ValuesConsumer to consume ValuesProvider.
  • Updated lisense to "BSD 3-Clause License".

1.0.0 #

  • Initial version.


import 'package:flutter/material.dart';

import './app/app_module.dart';

void main() => runApp(AppModule());

Use this package as a library

1. Depend on it

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

  module_provider: ^1.3.1

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:module_provider/module_provider.dart';
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Learn more about scoring.

We analyzed this package on Mar 27, 2020, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.7.1
  • pana: 0.13.6
  • Flutter: 1.12.13+hotfix.8

Health suggestions

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Run flutter format to format lib/classes/inherited_module.dart.

Format lib/classes/inject.dart.

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Format lib/classes/inject_manager.dart.

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  • lib/classes/on_dispose.dart (Run flutter format to format lib/classes/on_dispose.dart.)
  • lib/classes/utilities.dart (Run flutter format to format lib/classes/utilities.dart.)
  • lib/module_provider.dart (Run flutter format to format lib/module_provider.dart.)
  • lib/patterns/component.dart (Run flutter format to format lib/patterns/component.dart.)
  • lib/patterns/controller.dart (Run flutter format to format lib/patterns/controller.dart.)
  • lib/patterns/module.dart (Run flutter format to format lib/patterns/module.dart.)
  • lib/patterns/service.dart (Run flutter format to format lib/patterns/service.dart.)
  • lib/providers/consumer.dart (Run flutter format to format lib/providers/consumer.dart.)
  • lib/providers/list_consumer.dart (Run flutter format to format lib/providers/list_consumer.dart.)
  • lib/providers/list_provider.dart (Run flutter format to format lib/providers/list_provider.dart.)
  • lib/providers/service_consumer.dart (Run flutter format to format lib/providers/service_consumer.dart.)
  • lib/providers/value_consumer.dart (Run flutter format to format lib/providers/value_consumer.dart.)
  • lib/providers/value_provider.dart (Run flutter format to format lib/providers/value_provider.dart.)
  • lib/providers/values_consumer.dart (Run flutter format to format lib/providers/values_consumer.dart.)
  • lib/providers/values_provider.dart (Run flutter format to format lib/providers/values_provider.dart.)


Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.1.0 <3.0.0
flutter 0.0.0
Transitive dependencies
collection 1.14.11 1.14.12
meta 1.1.8
sky_engine 0.0.99
typed_data 1.1.6
vector_math 2.0.8
Dev dependencies
pedantic ^1.8.0