嘗試創建演示者時助攻注射錯誤

Question

我已經使用過杜松子輔助注射幾次，但是我對gwtp很陌生，而且我正面臨一條錯誤消息，我不明白嘗試使用我的工廠實例化PresenterWidget時的情況，甚至閱讀的主題幾個職位...

[ERROR] Error injecting @com.google.inject.assistedinject.Assisted(value=) java.lang.Integer: 
Unable to create or inherit binding: 
Binding requested for constant key '@com.google.inject.assistedinject.Assisted(value=) java.lang.Integer' but no explicit binding was found; 
Path to required node: 
org.moshika.dtp.client.application.book.page.PagePresenter [com.gwtplatform.mvp.client.gin.AbstractPresenterModule.bindPresenterWidget(AbstractPresenterModule.java:260)] 

語境後：我要顯示一本書的屏幕上的內容。目前，我使用帶有代理和位置的BookPresenter，並且我將嘗試以PresenterWidget的形式綁定/取消綁定頁面。我不認爲我的頁面可以作爲CellWidget實現，因爲我將實現大量的DTP/WYSIWYG功能。

我的模塊：

public class CommonModule extends AbstractGinModule { 

@Override 
protected void configure() { 
    // DefaultPlaceManager Places 
    install(new DefaultModule.Builder().defaultPlace(NameTokens.SEARCH).errorPlace(NameTokens.ERROR).unauthorizedPlace(NameTokens.ERROR).build()); 

    install(new GinFactoryModuleBuilder().build(PagePresenter.Factory.class)); 

    RestDispatchAsyncModule.Builder dispatchBuilder = new RestDispatchAsyncModule.Builder(); 
    install(dispatchBuilder.build()); 

    bindConstant().annotatedWith(RestApplicationPath.class).to("rest"); 

    bind(ResourceLoader.class).asEagerSingleton(); 

    bindPresenter(BookPresenter.class, BookPresenter.MyView.class, BookViewTablet.class, BookPresenter.MyProxy.class); 

    bindPresenterWidget(PagePresenter.class, PagePresenter.MyView.class, PageViewTablet.class); 

} 

BookPresenter：

public class BookPresenter extends Presenter<BookPresenter.MyView, BookPresenter.MyProxy> 
    implements BookUiHandlers { 

    public interface MyView extends View, HasUiHandlers<BookUiHandlers> { 
    } 

    @ProxyStandard 
    @NameToken(NameTokens.BOOK) 
    public interface MyProxy extends ProxyPlace<BookPresenter> { 
    } 

    static final Slot<PagePresenter> SLOT_BOOK = new Slot<PagePresenter>(); 

    private ResourceDelegate<PageResources> pageDelegate; 

    private PagePresenter.Factory factory; 

    @Inject 
    BookPresenter(EventBus eventBus, 
     MyView view, MyProxy proxy, 
     ResourceDelegate<PageResources> pageDelegate, 
     PagePresenter.Factory factory) { 
     super(eventBus, view, proxy, ApplicationPresenter.SLOT_MAIN); 

     view.setUiHandlers(this); 
     this.pageDelegate= pageDelegate; 
     this.factory= factory; 
    } 

    @Override 
    protected void onReveal() { 
     super.onReveal(); 
     NavigationVisibilityEvent.fire(this, true); 
     fetchPages(0, 5); 
    } 

    @Override 
    public void fetchPages(final int offset, int limit) { 
     pageDelegate.withCallback(new AsyncCallback<List<PageDto>>() { 

      @Override 
      public void onFailure(Throwable caught) { 
       // TODO Auto-generated method stub 
      } 

      @Override 
      public void onSuccess(List<PageDto> dtos) { 
       clearSlot(SLOT_BOOK); 
       for (PageDto dto : dtos) { 
        PagePresenter pagePresenter = factory.create(dto.getFolioPage()); 
        addToSlot(SLOT_DEROULE, pagePresenter); 
        pagePresenter.refreshModel(); 
       } 
      } 
     }).list(offset, limit); 
    } 
} 

PagePresenter和工廠：

public class PagePresenter extends PresenterWidget<PagePresenter .MyView> 
    implements PageUiHandlers { 

    public interface MyView extends View { 
     void setFolio(Integer folio); 
    } 

    public interface Factory { 
     CahierPageJourPresenter create(Integer folio); 
    } 

    private ResourceDelegate<PageResources> pageDelegate; 

    private Integer folioPage; 

    @Inject 
    PagePresenter(EventBus eventBus, MyView view, 
     ResourceDelegate<PageResources> pageDelegate, 
     @Assisted Integer folio) { 
     super(eventBus, view); 
     this.pageDelegate= pageDelegate; 
     this.folio= folio; 
} 

    public void refreshModel() { 
     pageDelegate.withCallback(new AsyncCallback<PageDto>() { 

      @Override 
      public void onFailure(Throwable caught) { 
       // TODO Auto-generated method stub 
      } 

      @Override 
      public void onSuccess(PageDtodto) { 
       getView().setFolio(dto.getFolio()); 
      } 
     }).get(folio); 
    } 
} 

這可能是一個非常愚蠢的錯誤，因爲我不明白我在做什麼，從同一主題的所有其他職位不同...

Answer 1

如果你想在這裏使用的輔助注射，不叫bindPresenterWidget(PagePresenter.class, PagePresenter.MyView.class, PageViewTablet.class);直。相反，只綁定視圖：bind(PagePresenter.MyView.class).to(PageViewTablet.class);

bindPresenterWidget實際上調用bind(PagePresenter.class)。然後綁定被解析，並且由於您沒有用@Assisted註解的Integer的常量，它會拋出。

如果您一次只能看到一個頁面，您還可以使用URL參數來存儲頁碼。然後，您可以覆蓋onReset()並根據請求的頁面更新內容。這種技術可以避免實例化多個PagePresenter，並且可以擺脫輔助工廠。