On Monday, June 6, 2011 3:08:58 AM UTC+2, Jonathan Aubuchon wrote:
>
> Hi, I'm a beginner with the architecture MVP Activities and Places.
>
> Suppose I have two views: View1 and View2
> (The two views have their own activity)
>
> Now suppose that I have one Composite (named Composite A) used by the
> two views. This Composite aggregate a textbox, display informations
> and make call to the database.
>
> Should I plug an activity over this Composite ? (In order to move the
> logic and database calls inside an activity instead to do that inside
> a view).
>
A presenter, yes. An activity, probably not (YMMV).
> I tried the activity solution and this is the steps I did:
>
> 1) Create a new activity and place for the CompositeA. Move some
> logics and database access inside it.
>
Why would you need a Place? the "activity" is supposed to be shown when the
other activities (the one acting as presenters for View1 and View2) are;
you're at the "same place" as those activities then (conceptually, the place
is the "URL" for what you're seeing on screen)
> 2) Create a container (SimplePanel) inside the View1 and View2 to
> hosted the CompositeA
> 3) Inside the activity of View1 and View2 (in the start method) , I
> instantiate the activity of the CompositeA and start it:
>
> ActivityCompsiteA activityCompositeA = new ActivityCompositeA(new
> ActivityCompositeAPlace(" "), clientFactory);
> activityCompositeA.start(view1.getContainerForCompositeA(), eventBus);
>
> It works fine, but maybe it exists a conventional way to do it?
>
I'm afraid not.
We've used a similar pattern but didn't use an Activity for the nested
presenter (because we don't need the lifecycle of the activity: we treat it
just like any other component in the view, it's just a bit "smarter" than
the others). We're putting the "composite" directly in the UiBinder
template, and then we simply "wrap" the presenter around it (and just like
any view, it's exposed as an interface, the composite being the equivalent
of the "ViewImpl"):
class MyActivity extends AbstractActivity {
private final MyView view;
private final NestedPresenter nestedPresenter;
@Inject
MyActivity(MyView view, NestedPresenterFactory factory) {
this.view = view;
nestedPresenter = factory.create(view.getNestedComposite());
}
...
}
(FYI, we're using GIN's @AssistedInject for the factory)
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