The question is: if only Activity uses the "old" event bus, and that one
happens to be provided by ActivityManager (which has a dependency on the
"new" event bus), and why couldn't you use the "new" event bus everywhere
else than the Activity#start method?
bind(com.google.web.bindery.event.shared.EventBus.class).to(com.google.web.bindery.event.shared.SimpleEventBus.class).in(Singleton.class);
@Provides PlaceController
providePlaceController(com.google.web.bindery.event.shared.EventBus bus) {
return new PlaceController(bus);
}
@Provides PlaceHistoryHandler providePlaceHistoryHandler(PlaceHistoryMapper
mapper) {
return new PlaceHistoryHandler(mapper);
}
...
ActivityManager manager = new ActivityManager(injector.activityMapper() //
simplification: assumes a single ActivityManager/ActivityMapper
injector.eventBus());
manager.setDisplay(display);
PlaceHistoryHandler phh = injector.placeHistoryHandler();
phh.register(injector.placeController(), injector.eventBus(), defaultPlace);
phh.handleCurrentHistory();
Everything above compiles OK, right?
Now, why that class would make it fail to compile then:
class MyActivity extends AbstractActivity {
public void start(AcceptsOneWidget
panel, com.google.gwt.event.shared.EventBus bus) {
panel.setWidget(new Label("Hello World!");
}
}
The activity has no dependency on the singleton/global event bus, and the
one passed to its start() method doesn't come from GIN; so what's the
problem?
And if you need to get injected the global event bus, for whatever reason,
then just do it:
import com.google.web.bindery.event.shared.EventBus;
class MyActivity extends AbstractActivity {
@Inject EventBus globalBus;
public void start(AcceptsOneWidget
panel, com.google.gwt.event.shared.EventBus bus) {
panel.setWidget(new Label("Hello World!");
globalBus.fireEvent(new StartedEvent("hello world"));
}
}
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