lunes, 19 de diciembre de 2011

gwt editor framework, 100% java example

I'm learning gwt, and found gwt editor framework and it seems very promising technology for doing gui. Nevertheless, there are little documentation available for gwt begginers, and all the examples uses gwt UIBinder, which I'm not.



So, this is a gwt module file, that contains a simple model class, a simple gwt editor for that model class, and a example of using it for displaying and let the user edit the model. No UIBinder, all the GUI was made in java using gwt eclipse editor. Enjoy!





package com.beeblos.portlet.circulares2.gwt.client;

import com.google.gwt.core.client.*;
import com.google.gwt.editor.client.*;
import com.google.gwt.event.dom.client.*;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.*;

/**
* entry point testing gwt editor framework. 100% java code, no UIBinder...
* @author: sgurin
*/
public class Circulares2 implements EntryPoint {


public static class Person {
String name;
Integer age;
public Person(String name, Integer age) {
super();
this.name = name;
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
}

/**
* the perdon's editor. Note that it has 2 non private attributes with the exact name
* as the Person's attributes.
*
* @author sg
*
*/
public class PersonEditor extends SimplePanel implements Editor {
TextBox name;
IntegerBox age;

public PersonEditor() {
Grid grid = new Grid(2, 2);
setWidget(grid);
grid.setSize("100%", "100%");

Label lblNewLabel = new Label("name");
grid.setWidget(0, 0, lblNewLabel);

name = new TextBox();
grid.setWidget(0, 1, name);

Label lblAge = new Label("age");
grid.setWidget(1, 0, lblAge);

age = new IntegerBox();
grid.setWidget(1, 1, age);
}
}

// Empty interface declaration, similar to UiBinder
interface Driver extends SimpleBeanEditorDriver {}


public void onModuleLoad() {

/* this is the main entry point of our gwt application.
* Here we instance the editor (a gwt panel), a sample
* instance object (a person) and a editor driver, the
* object that will let us link the data with the editor */

RootPanel rootPanel = RootPanel.get("uniqueID");


// Create the editor's Driver
final Driver driver = GWT.create(Driver.class);

//create a sample model object
Person p = new Person("john", 22);

// PersonEditor is a DialogBox that extends Editor
PersonEditor editor = new PersonEditor();
// Initialize the driver with the top-level editor
driver.initialize(editor);
// Copy the data in the object into the UI
driver.edit(p);

//at this point the editor panel is loaded with the person...

VerticalPanel vp = new VerticalPanel();
vp.setSize("100%", "100%");
rootPanel.add(vp);

Button editButton = new Button("edit", new ClickHandler() {
@Override
public void onClick(ClickEvent event) {
//we get the edited person object back
Person editedPerson = driver.flush();
Window.alert("edited person name: "+editedPerson.getName());
}
});
vp.add(editor);
vp.add(editButton);
}
}

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