In my "HomePage" initState function, I place the following code for listening to NewOrderEvent:

import '../eventbus/eventbus.dart';
.....
@override
void initState() {
  super.initState();
  eventBus.on<NewOrderEvent>().listen((event) {
    print("event fired: $event");
  });
}

These code works fine and in main.dart file, I invoke eventBus.fire(new NewOrderEvent("some data"); when my app receive message from Firebase Cloud Message, the eventBus.fire function is indeed be invoked, but the listen callback function not be called.

This is my "eventbus.dart" file content:

import 'package:event_bus/event_bus.dart';

EventBus eventBus = new EventBus();

class NewOrderEvent {
  Map order;

  NewOrderEvent(this.order);
}

I print the firing eventBus object and listening eventBus object:

They are indeed the same object.

BTW, the following are property and methods of the eventBus object:

main page

       @override
  void initState() {
	_listen();
  }

  var result;
  void _listen(){
	eventBus.on<UserLoggedInEvent>().listen((event){
	  log('eventevent'+ event.text);
	});
  }

and Second poge

        onTap: () => {
                      eventBus.fire(new UserLoggedInEvent('vvvvvvvvvvvv'))
       }

Hi @marcojakob I'm using event_bus: ^1.1.0 in flutter.

From one page i'm fire event like eventBus.fire(CustomEvents.START_MEDIA_SYNC_EVENT); and i'm listening event like

void getObserverData() { eventBus.on().listen((event) => {print(event.toString())}); } getObserverData() method is called from second screen build method.

I got the events two times. I initialize bus like this EventBus eventBus = new EventBus(); in one dart file.

Can please help me?

Thanks with best regards, Sumit Bhondave.

i have code like this:

class AccountPhotoChangeEvent {
  final File file;
  AccountPhotoChangeEvent(this.file);
}

if i try register event like this:

events.on(AccountPhotoChangeEvent).listen((AccountPhotoChangeEvent event) {
      
});

and error The argument type '(AccountPhotoChangeEvent) → Null' can't be assigned to the parameter type '(dynamic) → void'.

This is a simple but very useful event bus implementation but the use of mirrors is very inconvenient for client side use. Would be great to have the old implementation back (and maintained) maybe as an alternative in it's separate library.

I heard complaining others about this and just want to make you aware of the problem. In my projects, I currently use a fork anyway and am not affected currently.

I'm having issues when firing an event before the listener is set, for this case the listener never gets the event. Are there any mechanism to hold the event until the listener is ready?

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! Doctor found issues in 2 categories.

Flutter channels: master

• dev stable

setState() called after dispose(): MapState#dce2f(lifecycle state: defunct, not mounted) E/flutter (14865): This error happens if you call setState() on a State object for a widget that no longer appears in the widget tree (e.g., whose parent widget no longer includes the widget in its build). This error can occur when code calls setState() from a timer or an animation callback. The preferred solution is to cancel the timer or stop listening to the animation in the dispose() callback. Another solution is to check the "mounted" property of this object before calling setState() to ensure the object is still in the tree. E/flutter (14865): This error might indicate a memory leak if setState() is being called because another object is retaining a reference to this State object after it has been removed from the tree. To avoid memory leaks, consider breaking the reference to this object during dispose().

This pattern looks good for flutter. I know bloc pattern is the recommended way with flutter but I have to do code reuse and so event bus is a better fit for my use case.

Has anyone tried this ?

Its not a bug but rather a feature request: Event bus makes it harder to debug program. Having ability to switch logging on would greatly simplify life. It would be really nice to see events in the log as they are fired and consumed.

When testing the example app, i noticed that whenever you hit pause on one of the subscriptions, the OTHER subscriber fails to receive the event as well. Canceling a subscription works as expected, but pause and resume seems to target the whole event rather than just the subscription.