Why is my Presenter not shown in the slot I try to place it in?

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Stefan Falk

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Jun 19, 2016, 8:38:01 AM6/19/16
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I'm chewing on this quite long now. I'm not getting it ..

I'm having a NavBarPresenter:

public class NavBarPresenter extends Presenter<NavBarPresenter.MyView, NavBarPresenter.MyProxy> implements NavBarUiHandlers {
    
    private final static Logger LOGGER = Logger.getLogger(NavBarPresenter.class.getName());
    interface MyView extends View , HasUiHandlers<NavBarUiHandlers> {
    }

    public static final Type<RevealContentHandler<?>> SLOT_NavBar = new Type<RevealContentHandler<?>>();

    @ProxyStandard
    interface MyProxy extends Proxy<NavBarPresenter> {
    }

    @Inject
NavBarPresenter(EventBus eventBus, MyView view, MyProxy proxy) {
        super(eventBus, view, proxy, MenuPresenter.SLOT_NavBar);
        this.getView().setUiHandlers(this);
        LOGGER.severe("NavBarPresenter()");
    }
     
}

and the corresponding view:

class NavBarView extends ViewWithUiHandlers<NavBarUiHandlers> implements NavBarPresenter.MyView {
    
    private final static Logger LOGGER = Logger.getLogger(NavBarView.class.getName());
    interface Binder extends UiBinder<Widget, NavBarView> {
    }

    @UiField
    SimplePanel main;

    @Inject
    NavBarView(Binder uiBinder) {
        this.initWidget(uiBinder.createAndBindUi(this));
        LOGGER.severe("NavBarView()");
        this.bindSlot(MenuPresenter.SLOT_NavBar, this.main);
    }
    
    @Override
    public void setInSlot(Object slot, IsWidget content) {
        if (slot == NavBarPresenter.SLOT_NavBar) {
            this.main.setWidget(content);
        } else {
            super.setInSlot(slot, content);
        }
    }
} 

And this is how I try to show my navigation bar in prepareFromRequest as part of a place:


public class ShopPresenter extends Presenter<ShopPresenter.MyView, ShopPresenter.MyProxy> implements ShopUiHandlers {
    private final static Logger LOGGER = Logger.getLogger(ShopPresenter.class.getName());
    interface MyView extends View , HasUiHandlers<ShopUiHandlers> {
    }

    @NameToken(AdminNameTokens.shop)
    @ProxyStandard
    interface MyProxy extends ProxyPlace<ShopPresenter> {
    }

    @SuppressWarnings("unused")
    private NavBarPresenter navBarPresenter;
    private MenuPresenter menuPresenter;

    @Inject
    ShopPresenter(EventBus eventBus, MyView view, MyProxy proxy, MenuPresenter menuPresenter, NavBarPresenter navBarPresenter) {
        super(eventBus, view, proxy, AdminToolPresenter.SLOT_AdminToolMainContent);
this.menuPresenter = menuPresenter;
this.navBarPresenter = navBarPresenter;
        this.getView().setUiHandlers(this);

    }
    
    @Override
    public void prepareFromRequest(PlaceRequest request) {    
this.menuPresenter.setInSlot(MenuPresenter.SLOT_NavBar, this.navBarPresenter);
    }
    
} 


but I'm not seeing anything. No warning or exception it's just not doing anything. All in all I am trying to accomplish this:



So what I have is this: There are different places which can be visited using a *side* navigation.

    Place A
    Place B
    Place C

each of these places require a different navigation bar to be rendered in a `navBarPanel` widget which is held in a `MenuView`.

    @UiField HTMLPanel navBarPanel;

    @Inject MenuView(Binder uiBinder, PlaceManager placeManager) {
   
this.initWidget(uiBinder.createAndBindUi(this));
this.bindSlot(MenuPresenter.SLOT_NavBar, this.navBarPanel);
    }

But there is more. Some places have "sub-places" which can be introduced by a certain navigation bar e.g. if you click on the link to `Place B` then the navigation bar (not the *side* nav) will show you two links `Place B-1` and `Place B-2`.

My I essentially would like to know:

- What is the GWTP way to *update* the navigation bar? By that I mean that if I visit one of the sub places e.g. `Place B-1` using a bookmark, then the correct navigation bar needs to be rendered in the slot `MenuPresenter.SLOT_NavBar`.
- What kind of slot do I have to use for such a navigation widget or can I create e.g. a navigation bar which is a place but is listening to multiple places. What I mean is it could "react" to a set of places `Place B`, `Place B-1` and `Place B-2` and draws itself into the predefined slot whenever one of these places are getting navigated to.

I'm currently trying different things but none of them work. I can't even get the navigation bar being drawn in the slot.

Could somebody guide me throw this?

Stefan Falk

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Jun 21, 2016, 12:55:56 PM6/21/16
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