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Event Bus for Dart.

EventBus: Events for Dart/Flutter #

pub package codecov Dart

EventBus is an open-source library for Dart and Flutter using the publisher/subscriber pattern for loose coupling. EventBus enables central communication to decoupled classes with just a few lines of code – simplifying the code, removing dependencies, and speeding up app development.

event bus publish subscribe

Your benefits using EventBus: It… #

  • simplifies the communication between components;
  • decouples event senders and receivers;
  • performs well with UI artifacts (e.g. Widgets, Controllers);
  • avoids complex and error-prone dependencies and life cycle issues.
event bus plus

Define the app's events #

// Initialize the Service Bus
IAppEventBus eventBus = AppEventBus();

// Define your app events
final event = FollowEvent('@devcraft.ninja');
final event = CommentEvent('Awesome package 😎');

Subscribe #

// listen the latest event
final sub = eventBus.last$
        .listen((AppEvent event) { /*do something*/ });

// Listen particular event
final sub2 = eventBus.on<FollowAppEvent>()
        .listen((e) { /*do something*/ });

Publish #

// fire the event

Watch events in progress #

// start watch the event till its completion

// and check the progress

// or listen stream to check the processing
eventBus.inProgress$.map((List<AppEvent> events) =>

// complete

// or complete with completion event
_eventBus.complete(event, nextEvent: SomeAnotherEvent);

History #

final events = eventBus.history;

Mapping #

final eventBus = bus = EventBus(
        map: {
          SomeEvent: [
            (e) => SomeAnotherEvent(),

Contributing #

We accept the following contributions:

Maintainers #