MainPagePresenter.java

/**
 * Copyright 2010 Philippe Beaudoin
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.philbeaudoin.gwtpsample.client;

import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.ui.Button;
import com.google.inject.Inject;
import com.philbeaudoin.gwtp.mvp.client.EventBus;
import com.philbeaudoin.gwtp.mvp.client.PresenterImpl;
import com.philbeaudoin.gwtp.mvp.client.View;
import com.philbeaudoin.gwtp.mvp.client.proxy.Place;
import com.philbeaudoin.gwtp.mvp.client.proxy.PlaceManager;
import com.philbeaudoin.gwtp.mvp.client.proxy.PlaceRequest;
import com.philbeaudoin.gwtp.mvp.client.proxy.Proxy;
import com.philbeaudoin.gwtp.mvp.client.proxy.RevealRootContentEvent;
import com.philbeaudoin.gwtp.mvp.client.annotations.NameToken;
import com.philbeaudoin.gwtp.mvp.client.annotations.ProxyStandard;
import com.philbeaudoin.gwtpsample.shared.FieldVerifier;

public class MainPagePresenter 
extends PresenterImpl<MainPagePresenter.MyView, MainPagePresenter.MyProxy>{

  public static final String nameToken = "main";
  
  public interface MyView extends View {
    public Button getSendButton();
    public void setError(String errorText);
    public String getName();
    public void resetAndFocus();    
  }

  @ProxyStandard
  @NameToken(nameToken)
  public interface MyProxy extends Proxy<MainPagePresenter>, Place {}

  private final PlaceManager placeManager;

  @Inject
  public MainPagePresenter(EventBus eventBus, MyView view, MyProxy proxy, PlaceManager placeManager) {
    super(eventBus, view, proxy);
    this.placeManager = placeManager;
  }

  @Override
  protected void onBind() {
    super.onBind();
    registerHandler( getView().getSendButton().addClickHandler(new ClickHandler(){
      @Override
      public void onClick(ClickEvent event) {
        sendNameToServer();     
      }
    }) );
  }
  
  @Override
  protected void onReset() {
    super.onReset();
    getView().resetAndFocus();
  }

  @Override
  protected void revealInParent() {
    RevealRootContentEvent.fire( eventBus, this );
  }

  /**
   * Send the name from the nameField to the server and wait for a response.
   */
  private void sendNameToServer() {
    // First, we validate the input.
    getView().setError("");
    String textToServer = getView().getName();
    if (!FieldVerifier.isValidName(textToServer)) {
      getView().setError("Please enter at least four characters");
      return;
    }

    // Then, we transmit it to the ResponsePresenter, which will do the server call
    placeManager.revealPlace( new PlaceRequest(
        ResponsePresenter.nameToken).with(
            ResponsePresenter.textToServerParam, textToServer) );    
  }

}