Google Web Toolkit (GWT) MVP Example (2)

最新推荐文章于 2020-05-16 18:35:26 发布

原创最新推荐文章于 2020-05-16 18:35:26 发布 · 124 阅读

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GreetingPresenter.java

 
   001.
   package co.uk.hivedevelopment.greet.client.mvp; 
  
   002.
   import net.customware.gwt.dispatch.client.DispatchAsync; 
  
   003.
   import net.customware.gwt.presenter.client.DisplayCallback; 
  
   004.
   import net.customware.gwt.presenter.client.EventBus; 
  
   005.
   import net.customware.gwt.presenter.client.place.Place; 
  
   006.
   import net.customware.gwt.presenter.client.place.PlaceRequest; 
  
   007.
   import net.customware.gwt.presenter.client.widget.WidgetDisplay; 
  
   008.
   import net.customware.gwt.presenter.client.widget.WidgetPresenter; 
  
   009.
   import co.uk.hivedevelopment.greet.shared.event.GreetingSentEvent; 
  
   010.
   import co.uk.hivedevelopment.greet.shared.rpc.SendGreeting; 
  
   011.
   import co.uk.hivedevelopment.greet.shared.rpc.SendGreetingResult; 
  
   012.
   import com.allen_sauer.gwt.log.client.Log; 
  
   013.
   import com.google.gwt.event.dom.client.ClickEvent; 
  
   014.
   import com.google.gwt.event.dom.client.ClickHandler; 
  
   015.
   import com.google.gwt.event.dom.client.HasClickHandlers; 
  
   016.
   import com.google.gwt.user.client.Window; 
  
   017.
   import com.google.gwt.user.client.ui.HasValue; 
  
   018.
   import com.google.inject.Inject; 
  
   019.
   public class GreetingPresenter extends WidgetPresenter { 
  
   020.
    /** 
  
   021.
     * The message displayed to the user when the server cannot be reached or 
  
   022.
     * returns an error. 
  
   023.
     */ 
  
   024.
    private static final String SERVER_ERROR = "An error occurred while " 
  
   025.
     + "attempting to contact the server. Please check your network " 
  
   026.
     + "connection and try again."; 
  
   027.
      
   028.
    public interface Display extends WidgetDisplay { 
  
   029.
     public HasValue getName(); 
  
   030.
     public HasClickHandlers getSend(); 
  
   031.
    } 
  
   032.
    public static final Place PLACE = new Place("Greeting"); 
  
   033.
      
   034.
    private final DispatchAsync dispatcher; 
  
   035.
    // FUDGE FACTOR! Although this is not used, having Gin pass the object 
  
   036.
    // to this class will force its instantiation and therefore will make the 
  
   037.
    // response presenter listen for events (via bind()). This is not a very good way to 
  
   038.
    // achieve this, but I wanted to put something together quickly - sorry! 
  
   039.
    private final GreetingResponsePresenter greetingResponsePresenter; 
  
   040.
    @Inject 
  
   041.
    public GreetingPresenter(final Display display, 
  
   042.
        final EventBus eventBus, 
  
   043.
        final DispatchAsync dispatcher, 
  
   044.
        final GreetingResponsePresenter greetingResponsePresenter) { 
  
   045.
     super(display, eventBus); 
  
   046.
       
   047.
     this.dispatcher = dispatcher; 
  
   048.
       
   049.
     this.greetingResponsePresenter = greetingResponsePresenter; 
  
   050.
       
   051.
     bind(); 
  
   052.
    } 
  
   053.
      
   054.
    /** 
  
   055.
     * Try to send the greeting message 
  
   056.
     */ 
  
   057.
    private void doSend() { 
  
   058.
     Log.info("Calling doSend"); 
  
   059.
       
   060.
     dispatcher.execute(new SendGreeting(display.getName().getValue()), new DisplayCallback(display) { 
  
   061.
      @Override 
  
   062.
      protected void handleFailure(final Throwable cause) { 
  
   063.
       Log.error("Handle Failure:", cause); 
  
   064.
         
   065.
       Window.alert(SERVER_ERROR); 
  
   066.
      } 
  
   067.
      @Override 
  
   068.
      protected void handleSuccess(final SendGreetingResult result) { 
  
   069.
       // take the result from the server and notify client interested components 
  
   070.
       eventBus.fireEvent(new GreetingSentEvent(result.getName(), result.getMessage())); 
  
   071.
      } 
  
   072.
        
   073.
     }); 
  
   074.
    } 
  
   075.
    @Override 
  
   076.
    protected void onBind() { 
  
   077.
     // 'display' is a final global field containing the Display passed into the constructor. 
  
   078.
     display.getSend().addClickHandler(new ClickHandler() { 
  
   079.
      public void onClick(final ClickEvent event) { 
  
   080.
       doSend(); 
  
   081.
      } 
  
   082.
     }); 
  
   083.
    } 
  
   084.
    @Override 
  
   085.
    protected void onUnbind() { 
  
   086.
     // Add unbind functionality here for more complex presenters. 
  
   087.
    } 
  
   088.
    public void refreshDisplay() { 
  
   089.
     // This is called when the presenter should pull the latest data 
  
   090.
     // from the server, etc. In this case, there is nothing to do. 
  
   091.
    } 
  
   092.
    public void revealDisplay() { 
  
   093.
     // Nothing to do. This is more useful in UI which may be buried 
  
   094.
     // in a tab bar, tree, etc. 
  
   095.
    } 
  
   096.
    /** 
  
   097.
     * Returning a place will allow this presenter to automatically trigger when 
  
   098.
     * '#Greeting' is passed into the browser URL. 
  
   099.
     */ 
  
   100.
    @Override 
  
   101.
    public Place getPlace() { 
  
   102.
     return PLACE; 
  
   103.
    } 
  
   104.
    @Override 
  
   105.
    protected void onPlaceRequest(final PlaceRequest request) { 
  
   106.
     // Grab the 'name' from the request and put it into the 'name' field. 
  
   107.
     // This allows a tag of '#Greeting;name=Foo' to populate the name 
  
   108.
     // field. 
  
   109.
     final String name = request.getParameter("name", null); 
  
   110.
       
   111.
     if (name != null) { 
  
   112.
      display.getName().setValue(name); 
  
   113.
     } 
  
   114.
    } 
  
   115.
   }

GreetingResponseView.java

 
   01.
   package co.uk.hivedevelopment.greet.client.mvp; 
  
   02.
   import net.customware.gwt.presenter.client.widget.WidgetDisplay; 
  
   03.
   import com.google.gwt.event.dom.client.HasClickHandlers; 
  
   04.
   import com.google.gwt.user.client.ui.Button; 
  
   05.
   import com.google.gwt.user.client.ui.DialogBox; 
  
   06.
   import com.google.gwt.user.client.ui.HTML; 
  
   07.
   import com.google.gwt.user.client.ui.HasHTML; 
  
   08.
   import com.google.gwt.user.client.ui.HasText; 
  
   09.
   import com.google.gwt.user.client.ui.Label; 
  
   10.
   import com.google.gwt.user.client.ui.VerticalPanel; 
  
   11.
   import com.google.gwt.user.client.ui.Widget; 
  
   12.
   public class GreetingResponseView extends DialogBox implements GreetingResponsePresenter.Display { 
  
   13.
    private final Label textToServerLabel; 
  
   14.
    private final HTML serverResponseLabel; 
  
   15.
    private final Button closeButton; 
  
   16.
    public GreetingResponseView() { 
  
   17.
     setText("Remote Procedure Call"); 
  
   18.
     setAnimationEnabled(true); 
  
   19.
     closeButton = new Button("Close"); 
  
   20.
     // We can set the id of a widget by accessing its Element 
  
   21.
     closeButton.getElement().setId("closeButton"); 
  
   22.
     textToServerLabel = new Label(); 
  
   23.
     serverResponseLabel = new HTML(); 
  
   24.
     final VerticalPanel dialogVPanel = new VerticalPanel(); 
  
   25.
     dialogVPanel.addStyleName("dialogVPanel"); 
  
   26.
     dialogVPanel.add(new HTML("Sending name to the server:")); 
  
   27.
     dialogVPanel.add(textToServerLabel); 
  
   28.
     dialogVPanel.add(new HTML("Server replies:")); 
  
   29.
     dialogVPanel.add(serverResponseLabel); 
  
   30.
     dialogVPanel.setHorizontalAlignment(VerticalPanel.ALIGN_RIGHT); 
  
   31.
     dialogVPanel.add(closeButton); 
  
   32.
     setWidget(dialogVPanel); 
  
   33.
    } 
  
   34.
    public HasText getTextToServer() { 
  
   35.
     return textToServerLabel; 
  
   36.
    } 
  
   37.
    public HasHTML getServerResponse() { 
  
   38.
     return serverResponseLabel; 
  
   39.
    } 
  
   40.
    public HasClickHandlers getClose() { 
  
   41.
     return closeButton; 
  
   42.
    } 
  
   43.
    public DialogBox getDialogBox() { 
  
   44.
     return this; 
  
   45.
    } 
  
   46.
    /** 
  
   47.
     * Returns this widget as the {@link WidgetDisplay#asWidget()} value. 
  
   48.
     */ 
  
   49.
    public Widget asWidget() { 
  
   50.
     return this; 
  
   51.
    } 
  
   52.
    @Override 
  
   53.
    public void startProcessing() { 
  
   54.
    } 
  
   55.
    @Override 
  
   56.
    public void stopProcessing() { 
  
   57.
    } 
  
   58.
   }