Google Web Toolkit (GWT) MVP Example (2) -

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Google Web Toolkit (GWT) MVP Example (2)

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GreetingPresenter.java

package co.uk.hivedevelopment.greet.client.mvp; 

import net.customware.gwt.dispatch.client.DispatchAsync; 

import net.customware.gwt.presenter.client.DisplayCallback; 

import net.customware.gwt.presenter.client.EventBus; 

import net.customware.gwt.presenter.client.place.Place; 

import net.customware.gwt.presenter.client.place.PlaceRequest; 

import net.customware.gwt.presenter.client.widget.WidgetDisplay; 

import net.customware.gwt.presenter.client.widget.WidgetPresenter; 

import co.uk.hivedevelopment.greet.shared.event.GreetingSentEvent; 

import co.uk.hivedevelopment.greet.shared.rpc.SendGreeting; 

import co.uk.hivedevelopment.greet.shared.rpc.SendGreetingResult; 

import com.allen_sauer.gwt.log.client.Log; 

import com.google.gwt.event.dom.client.ClickEvent; 

import com.google.gwt.event.dom.client.ClickHandler; 

import com.google.gwt.event.dom.client.HasClickHandlers; 

import com.google.gwt.user.client.Window; 

import com.google.gwt.user.client.ui.HasValue; 

import com.google.inject.Inject; 

public class GreetingPresenter extends WidgetPresenter { 

 /** 

  * The message displayed to the user when the server cannot be reached or 

  * returns an error. 

  */ 

 private static final String SERVER_ERROR = "An error occurred while " 

  + "attempting to contact the server. Please check your network " 

  + "connection and try again."; 

   

 public interface Display extends WidgetDisplay { 

  public HasValue getName(); 

  public HasClickHandlers getSend(); 

 } 

 public static final Place PLACE = new Place("Greeting"); 

   

 private final DispatchAsync dispatcher; 

 // FUDGE FACTOR! Although this is not used, having Gin pass the object 

 // to this class will force its instantiation and therefore will make the 

 // response presenter listen for events (via bind()). This is not a very good way to 

 // achieve this, but I wanted to put something together quickly - sorry! 

 private final GreetingResponsePresenter greetingResponsePresenter; 

 @Inject 

 public GreetingPresenter(final Display display, 

     final EventBus eventBus, 

     final DispatchAsync dispatcher, 

     final GreetingResponsePresenter greetingResponsePresenter) { 

  super(display, eventBus); 

    

  this.dispatcher = dispatcher; 

    

  this.greetingResponsePresenter = greetingResponsePresenter; 

    

  bind(); 

 } 

   

 /** 

  * Try to send the greeting message 

  */ 

 private void doSend() { 

  Log.info("Calling doSend"); 

    

  dispatcher.execute(new SendGreeting(display.getName().getValue()), new DisplayCallback(display) { 

   @Override 

   protected void handleFailure(final Throwable cause) { 

    Log.error("Handle Failure:", cause); 

      

    Window.alert(SERVER_ERROR); 

   } 

   @Override 

   protected void handleSuccess(final SendGreetingResult result) { 

    // take the result from the server and notify client interested components 

    eventBus.fireEvent(new GreetingSentEvent(result.getName(), result.getMessage())); 

   } 

     

  }); 

 } 

 @Override 

 protected void onBind() { 

  // 'display' is a final global field containing the Display passed into the constructor. 

  display.getSend().addClickHandler(new ClickHandler() { 

   public void onClick(final ClickEvent event) { 

    doSend(); 

   } 

  }); 

 } 

 @Override 

 protected void onUnbind() { 

  // Add unbind functionality here for more complex presenters. 

 } 

 public void refreshDisplay() { 

  // This is called when the presenter should pull the latest data 

  // from the server, etc. In this case, there is nothing to do. 

 } 

 public void revealDisplay() { 

  // Nothing to do. This is more useful in UI which may be buried 

  // in a tab bar, tree, etc. 

 } 

 /** 

  * Returning a place will allow this presenter to automatically trigger when 

  * '#Greeting' is passed into the browser URL. 

  */ 

 @Override 

 public Place getPlace() { 

  return PLACE; 

 } 

 @Override 

 protected void onPlaceRequest(final PlaceRequest request) { 

  // Grab the 'name' from the request and put it into the 'name' field. 

  // This allows a tag of '#Greeting;name=Foo' to populate the name 

  // field. 

  final String name = request.getParameter("name", null); 

    

  if (name != null) { 

   display.getName().setValue(name); 

  } 

 } 

}

GreetingResponseView.java

package co.uk.hivedevelopment.greet.client.mvp; 

import net.customware.gwt.presenter.client.widget.WidgetDisplay; 

import com.google.gwt.event.dom.client.HasClickHandlers; 

import com.google.gwt.user.client.ui.Button; 

import com.google.gwt.user.client.ui.DialogBox; 

import com.google.gwt.user.client.ui.HTML; 

import com.google.gwt.user.client.ui.HasHTML; 

import com.google.gwt.user.client.ui.HasText; 

import com.google.gwt.user.client.ui.Label; 

import com.google.gwt.user.client.ui.VerticalPanel; 

import com.google.gwt.user.client.ui.Widget; 

public class GreetingResponseView extends DialogBox implements GreetingResponsePresenter.Display { 

 private final Label textToServerLabel; 

 private final HTML serverResponseLabel; 

 private final Button closeButton; 

 public GreetingResponseView() { 

  setText("Remote Procedure Call"); 

  setAnimationEnabled(true); 

  closeButton = new Button("Close"); 

  // We can set the id of a widget by accessing its Element 

  closeButton.getElement().setId("closeButton"); 

  textToServerLabel = new Label(); 

  serverResponseLabel = new HTML(); 

  final VerticalPanel dialogVPanel = new VerticalPanel(); 

  dialogVPanel.addStyleName("dialogVPanel"); 

  dialogVPanel.add(new HTML("Sending name to the server:")); 

  dialogVPanel.add(textToServerLabel); 

  dialogVPanel.add(new HTML("Server replies:")); 

  dialogVPanel.add(serverResponseLabel); 

  dialogVPanel.setHorizontalAlignment(VerticalPanel.ALIGN_RIGHT); 

  dialogVPanel.add(closeButton); 

  setWidget(dialogVPanel); 

 } 

 public HasText getTextToServer() { 

  return textToServerLabel; 

 } 

 public HasHTML getServerResponse() { 

  return serverResponseLabel; 

 } 

 public HasClickHandlers getClose() { 

  return closeButton; 

 } 

 public DialogBox getDialogBox() { 

  return this; 

 } 

 /** 

  * Returns this widget as the {@link WidgetDisplay#asWidget()} value. 

  */ 

 public Widget asWidget() { 

  return this; 

 } 

 @Override 

 public void startProcessing() { 

 } 

 @Override 

 public void stopProcessing() { 

 } 

}

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2009-11-24 18:03
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