My fired event is not handled by the parent presenter

[Faissal Elamraoui]

Hello everyone,

I have a child presenter (added to the parent in a slot) that fires an event through the eventBus (on a condition) when onBind() is called :

class ChildPresenter extends PresenterWidget<?> {

 

        void onBind() {

               instance = initMyInstance();

               if (instance == null) {

                        eventBus.fireEvent(new MyEvent());0

               }

        }

       

       //...

}

On the parent, i handle the event in the onBind() method like this :

class ParentPresenter {

        

     void onBind() {

           eventBus.addHandler(MyEvent.TYPE, new MyEventHandler() {...} );

          // I tried also this : addRegisteredHandler(LoggedOutEvent.TYPE, this) and  addVisibleHandler(...) too

         // Where i implement the MyEventHandler interface in the parent presenter

     }

}

The parent does not handle the fired event. Am i doing it wrong? I noticed also when i move the handling process to the onReveal() method of my parent presenter, it worked but twice !!

Any pointers?  Thank you.

[Richard Wallis]

Your child presenter is injected into your Parent Presenter so it must exist before your parent presenter is created.

This means that the child's onBind() runs before the parents.  So the Parent presenter has not registered its handler when the event is fired.

----

Also your code is not idiomatic.  Use addRegisteredHandler and just call fireEvent() to fire your event.

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[Faissal Elamraoui]

Thanks Richard. It was a timing issue. To give time to the Parent to add a handler, i deferred fireEvent like this :

Scheduler.get().scheduleDeferred(new ScheduledCommand() {
    @Override
    public void execute() {
    eventBus.fireEvent(new MyEvent());
                       }
                   });