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Part 5 - UiBinder
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‎.gitignore

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hellogwt.db
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target/

‎ReadMe.md

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This project is a step-by-step Spring-GWT tutorial.
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It is inspired from the article written by Alex Tretyakov on 2011-11-14
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[Spring and GWT tutorial. Part 4 - MyBatis and MySQL](http://alextretyakov.blogspot.fr/2011/11/developing-simple-web-application-using.html).
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It is inspired from the article written by Alex Tretyakov on 2012-08-30
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[Spring and GWT tutorial. Part 5 - UiBinder](http://alextretyakov.blogspot.fr/2012/08/using-uibinder.html).
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The project was created as a "Maven Project" in Eclipse.
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Then files from hellogwt were added, commented and modified to run with SQLite instead of MySQL.

‎src/main/java/com/hellogwt/client/HelloGWT.java

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/**
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* GWT entry point.
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*
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* Content of class HelloGWT does not contain UI creation and application logic code.
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* All this stuff is helloGWTWidget object's responsibility.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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import com.google.gwt.core.client.EntryPoint;
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import com.google.gwt.core.client.GWT;
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import com.google.gwt.event.dom.client.KeyUpEvent;
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import com.google.gwt.event.dom.client.KeyUpHandler;
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import com.google.gwt.event.dom.client.ClickEvent;
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import com.google.gwt.event.dom.client.ClickHandler;
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import com.google.gwt.user.client.Window;
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import com.google.gwt.user.client.rpc.AsyncCallback;
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import com.google.gwt.user.client.ui.Button;
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import com.google.gwt.user.client.ui.FlexTable;
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import com.google.gwt.user.client.ui.HorizontalPanel;
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import com.google.gwt.user.client.ui.Label;
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import com.google.gwt.user.client.ui.RootPanel;
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import com.google.gwt.user.client.ui.TextBox;
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import com.hellogwt.shared.domain.Greeting;
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import java.util.List;
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/**
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* @author Alex Tretyakov
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*/
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public class HelloGWT implements EntryPoint {
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private GreetingServiceAsync greetingService = GWT.create(GreetingService.class);
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private HorizontalPanel greetingPanel = new HorizontalPanel();
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private TextBox nameTextBox = new TextBox();
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private Label greetingLabel = new Label("Hello, GWT!");
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private HorizontalPanel authorPanel = new HorizontalPanel();
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private HorizontalPanel textPanel = new HorizontalPanel();
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private HorizontalPanel editPanel = new HorizontalPanel();
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private Label authorLabel = new Label("Author:");
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private Label textLabel = new Label("Text:");
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private TextBox authorTextBox = new TextBox();
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private TextBox textTextBox = new TextBox();
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private Button addButton = new Button("Add");
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private Button updateButton = new Button("Update");
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private Button deleteButton = new Button("Delete");
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private FlexTable greetingsFlexTable = new FlexTable();
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/**
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* Use our service GreetingService in application.
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*
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* We will invoke greet() method every time any symbol is entered into the text field.
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* If greet() completes successfully then label text will change to String that method returns.
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* Otherwise label text will tell us about error.
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*
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* We will invoke greet() method every time any symbol is entered into the
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* text field. If greet() completes successfully then label text will change
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* to String that method returns. Otherwise label text will tell us about
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* error.
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*/
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@Override
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public void onModuleLoad() {
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initWidgets();
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initHandlers();
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refreshGreetingsTable();
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}
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private void initWidgets() {
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// label
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greetingPanel.add(nameTextBox);
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greetingPanel.add(greetingLabel);
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RootPanel.get().add(greetingPanel);
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// table
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authorLabel.setWidth("50");
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authorTextBox.setWidth("100");
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authorPanel.add(authorLabel);
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authorPanel.add(authorTextBox);
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textLabel.setWidth("50");
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textTextBox.setWidth("100");
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textPanel.add(textLabel);
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textPanel.add(textTextBox);
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addButton.setWidth("50");
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updateButton.setWidth("50");
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deleteButton.setWidth("50");
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editPanel.add(addButton);
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editPanel.add(updateButton);
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editPanel.add(deleteButton);
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RootPanel.get().add(authorPanel);
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RootPanel.get().add(textPanel);
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RootPanel.get().add(editPanel);
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RootPanel.get().add(greetingsFlexTable);
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}
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private void initHandlers() {
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// label
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final AsyncCallback<String> textbox_callback = new AsyncCallback<String>() {
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@Override
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public void onFailure(Throwable caught) {
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greetingLabel.setText("ERROR!");
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}
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@Override
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public void onSuccess(String result) {
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greetingLabel.setText(result);
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}
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};
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nameTextBox.addKeyUpHandler(new KeyUpHandler() {
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@Override
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public void onKeyUp(KeyUpEvent keyUpEvent) {
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greetingService.greet(nameTextBox.getText(), textbox_callback);
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}
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});
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// table
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final AsyncCallback<Void> btn_callback = new AsyncCallback<Void>() {
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@Override
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public void onFailure(Throwable caught) {
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Window.alert("ERROR: Cannot edit greetings!");
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}
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@Override
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public void onSuccess(Void result) {
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refreshGreetingsTable();
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}
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};
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addButton.addClickHandler(new ClickHandler() {
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@Override
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public void onClick(ClickEvent clickEvent) {
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if (!authorTextBox.getText().isEmpty()
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&& !textTextBox.getText().isEmpty()) {
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greetingService.getGreeting(textTextBox.getText(),
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new AsyncCallback<Greeting>() {
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@Override
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public void onFailure(Throwable caught) {
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Window.alert("ERROR: Cannot find greeting!");
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}
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@Override
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public void onSuccess(Greeting result) {
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if (result == null) {
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greetingService.addGreeting(authorTextBox.getText(),
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textTextBox.getText(), btn_callback);
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} else {
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Window.alert("Greeting already exists!");
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}
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}
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});
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} else {
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Window.alert("\"Author\" and \"Text\" fields cannot be empty!");
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}
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}
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});
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updateButton.addClickHandler(new ClickHandler() {
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@Override
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public void onClick(ClickEvent event) {
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if (!authorTextBox.getText().isEmpty()
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&& !textTextBox.getText().isEmpty()) {
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greetingService.updateGreeting(authorTextBox.getText(),
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textTextBox.getText(), btn_callback);
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} else {
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Window.alert("\"Author\" and \"Text\" fields cannot be empty!");
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}
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}
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});
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deleteButton.addClickHandler(new ClickHandler() {
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@Override
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public void onClick(ClickEvent event) {
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greetingService.deleteGreeting(textTextBox.getText(), btn_callback);
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}
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});
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}
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private void refreshGreetingsTable() {
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greetingService.getGreetings(new AsyncCallback<List<Greeting>>() {
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@Override
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public void onFailure(Throwable throwable) {
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Window.alert("ERROR: Cannot load greetings!");
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}
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@Override
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public void onSuccess(List<Greeting> greetings) {
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fillGreetingsTable(greetings);
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}
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});
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}
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private void fillGreetingsTable(List<Greeting> greetings) {
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greetingsFlexTable.removeAllRows();
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greetingsFlexTable.setText(0, 0, "Author");
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greetingsFlexTable.setText(0, 1, "Text");
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for (Greeting greeting : greetings) {
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int row = greetingsFlexTable.getRowCount();
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HelloGWTWidget helloGWTWidget = GWT.create(HelloGWTWidget.class);
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greetingsFlexTable.setText(row, 0, greeting.getAuthor());
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greetingsFlexTable.setText(row, 1, greeting.getText());
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}
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RootPanel.get().add(helloGWTWidget);
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}
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}

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