On Tuesday, June 4, 2013 12:46:16 PM UTC+2, Tugdual Huertas wrote:
>
> Hi all,
>
> i'm facing a litlle problem using places activities and events... Have
> tried multiple tricks but not luck .
>
> My problem:
> i try to fire an event from the activity but my widget does not catch it
> since its not loaded (I mean that if i fire this event once the widget's
> loaded everything works fine).
>
> Here is my Gin configuration:
>
> @Override
> protected void configure()
> {
> bind(EventBus.class).to(SimpleEventBus.class).asEagerSingleton();
>
>
> bind(PlaceHistoryMapper.class).to(MyPlaceHistoryMapper.class).in(Singleton.class);
>
> bind(ActivityMapper.class).to(MyActivityMapper.class).in(Singleton.class);
> bind(MyActivity.class);
> install(new
> GinFactoryModuleBuilder().build(MyActivityMapper.Factory.class));
> }
>
> @Provides
> @Singleton
> public PlaceController getPlaceController(EventBus eventBus)
> {
> return new PlaceController(eventBus);
> }
>
> @Singleton
> @Provides
> public ActivityManager provideActivityManager(ActivityMapper
> activityMapper, EventBus eventBus)
> {
> return new ActivityManager(activityMapper, eventBus);
> }
>
> in MyActivity:
> @Inject
> private MyWidget myWidget;
> @Inject
> private EventBus globalEventBus;
>
> @Override
> public void start(AcceptsOneWidget panel, EventBus eventBus)
> {
> panel.setWidget(myWidget);
> MyEvent event = new MyEvent();
> event.setAction(MyEvent.Action.INIT);
> globalEventBus.fireEvent(event);
> }
>
> I also try two different ways of binding events in my widget, during
> onLoad and in constructor:
>
> During onLoad:
>
> @Inject EventBus eventBus;
>
> @Override
> protected void onLoad()
> {
> handlersRegistration.add(eventBus.addHandler(MyEvent.TYPE, this));
> }
>
>
> In constructor:
>
> private EventBus eventBus;
>
> @Inject
> public MyWidget(EventBus eventBus)
> {
> this.eventBus = eventBus;
> // registration of handlers
> handlersRegistration = new ArrayList<HandlerRegistration>();
> // register myself has a listener of different event TYPE
> handlersRegistration.add(eventBus.addHandler(MyEvent.TYPE, this));
>
> ...
> }
>
>
> Am I doing something w rong or missing something?
>
All adds and removes of event handlers during the dispatching of an event
(which is the case when the activity starts: it's in response to a
PlaceChangeEvent) is deferred to after the event has been dispatched all
handlers.
Events however are dispatched synchronously (so that handlers can possibly
modify them and the sender take action depending on the event after the
dispatching; see setWarning for PlaceChangeRequestEvent).
So you have to defer your fireEvent() call using the Scheduler:
// Assuming a Scheduler has been @Inject-ed
scheduler.scheduleFinally(new ScheduledCommand() {
@Override
public void execute() {
MyEvent event = new MyEvent();
event.setAction(MyEvent.Action.INIT);
globalEventBus.fireEvent(event);
}
});
It's a good rule to always assume you might be called as part of event
dispatching unless you're handling UI events (click on a button, etc.) and
thus always defer your event dispatching in this case.
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