/example/src/main/java/example/client/ExampleEntryPoint.java

/*

 * Copyright 2010 Jeff McHugh (Segue Development LLC)

 * 

 * 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 example.client;





import example.shared.UserFormData;



import com.google.gwt.core.client.EntryPoint;

import com.google.gwt.core.client.GWT;

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

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



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

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

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

import com.google.gwt.user.client.rpc.AsyncCallback;

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.Label;

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

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

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



/**

 * Entry point classes define <code>onModuleLoad()</code>.

 */

public class ExampleEntryPoint implements EntryPoint

{

	/**

	 * 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.";



	/**

	 * Create a remote service proxy to talk to the server-side Greeting service.

	 */

	private final GreetingServiceAsync	greetingService	= GWT.create(GreetingService.class);



	/**

	 * This is the entry point method.

	 */

	public void onModuleLoad()

	{

		final Button sendButton = new Button("Send");



		final TextBox acctField = new TextBox();

		acctField.setText("nobody@gmail.com");

		

		final TextBox nameField = new TextBox();

		nameField.setText("nobody");

		

		final TextBox ageField = new TextBox();

		ageField.setText("26");

		

		final Label errorLabel = new Label();



		// We can add style names to widgets

		sendButton.addStyleName("sendButton");



		// Add the nameField and sendButton to the RootPanel

		// Use RootPanel.get() to get the entire body element

		RootPanel.get("nameFieldContainer").add(nameField);

		RootPanel.get("accountIdFieldContainer").add(acctField);

		RootPanel.get("ageFieldContainer").add(ageField);

		

		RootPanel.get("sendButtonContainer").add(sendButton);

		RootPanel.get("errorLabelContainer").add(errorLabel);



		// Focus the cursor on the name field when the app loads

		nameField.setFocus(true);

		nameField.selectAll();



		// Create the popup dialog box

		final DialogBox dialogBox = new DialogBox();

		dialogBox.setText("Remote Procedure Call");

		dialogBox.setAnimationEnabled(true);

		final Button closeButton = new Button("Close");

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

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

		final Label textToServerLabel = new Label();

		final HTML serverResponseLabel = new HTML();

		VerticalPanel dialogVPanel = new VerticalPanel();

		dialogVPanel.addStyleName("dialogVPanel");

		dialogVPanel.add(new HTML("<b>Sending data to the server...</b>"));

		//dialogVPanel.add(textToServerLabel);

		dialogVPanel.add(new HTML("<br><b>Server replies:</b>"));

		dialogVPanel.add(serverResponseLabel);

		dialogVPanel.setHorizontalAlignment(VerticalPanel.ALIGN_RIGHT);

		dialogVPanel.add(closeButton);

		dialogBox.setWidget(dialogVPanel);



		// Add a handler to close the DialogBox

		closeButton.addClickHandler(new ClickHandler()

		{

			public void onClick(ClickEvent event)

			{

				dialogBox.hide();

				sendButton.setEnabled(true);

				sendButton.setFocus(true);

			}

		});



		// Create a handler for the sendButton and nameField

		class MyHandler implements ClickHandler, KeyUpHandler

		{

			/**

			 * Fired when the user clicks on the sendButton.

			 */

			public void onClick(ClickEvent event)

			{

				sendNameToServer();

			}



			/**

			 * Fired when the user types in the nameField.

			 */

			public void onKeyUp(KeyUpEvent event)

			{

			}



			/**

			 * Send the name from the nameField to the server and wait for a response.

			 */

			private void sendNameToServer()

			{

				// First, we validate the input.

				errorLabel.setText("");

				String name = nameField.getText();

				String account = acctField.getText();

				String age = ageField.getText();



				// Then, we send the input to the server.

				sendButton.setEnabled(false);

				textToServerLabel.setText("sending...");

				serverResponseLabel.setText("");

				

				Integer theAge = null;

				try

				{

					theAge = new Integer(age);

				}

				catch(Exception e)

				{

					Window.alert("Age does not appear to be a number");

					return;

				}

				

				UserFormData data = new UserFormData();

				data.setAccountId(account);

				data.setAge(theAge);

				data.setName(name);

				

				greetingService.addUserFormData(data, new AsyncCallback<String>()

				{

					public void onFailure(Throwable caught)

					{

						caught.printStackTrace();

						// Show the RPC error message to the user

						dialogBox.setText("Remote Procedure Call - Failure");

						serverResponseLabel.addStyleName("serverResponseLabelError");

						serverResponseLabel.setHTML(SERVER_ERROR);

						dialogBox.center();

						closeButton.setFocus(true);

					}



					public void onSuccess(String resp)

					{

						dialogBox.setText("Remote Procedure Call");

						serverResponseLabel.removeStyleName("serverResponseLabelError");

						serverResponseLabel.setHTML(resp);

						dialogBox.center();

						closeButton.setFocus(true);

					}

				});

			}

		}



		// Add a handler to send the name to the server

		MyHandler handler = new MyHandler();

		sendButton.addClickHandler(handler);

		nameField.addKeyUpHandler(handler);

	}

}