<?xml version="1.0" encoding="utf-8"?>
<page xmlns="http://projectmallard.org/1.0/" xmlns:its="http://www.w3.org/2005/11/its" xmlns:xi="http://www.w3.org/2001/XInclude" type="guide" style="task" id="button.js" xml:lang="es">
  <info>
  <title type="text">Botón (JavaScript)</title>
    <link type="guide" xref="beginner.js#buttons"/>
    <revision version="0.1" date="2012-04-19" status="draft"/>

    <credit type="author copyright">
      <name>Taryn Fox</name>
      <email its:translate="no">jewelfox@fursona.net</email>
      <years>2012</years>
    </credit>

    <desc>Un botón que puede estar conectado a otros widgets.</desc>
  
    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
      <mal:name>Daniel Mustieles</mal:name>
      <mal:email>daniel.mustieles@gmail.com</mal:email>
      <mal:years>2011 - 2020</mal:years>
    </mal:credit>
  
    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
      <mal:name>Nicolás Satragno</mal:name>
      <mal:email>nsatragno@gmail.com</mal:email>
      <mal:years>2012 - 2013</mal:years>
    </mal:credit>
  
    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
      <mal:name>Jorge González</mal:name>
      <mal:email>jorgegonz@svn.gnome.org</mal:email>
      <mal:years>2011</mal:years>
    </mal:credit>
  </info>

  <title>Button</title>
  <media type="image" mime="image/png" src="media/button.png"/>
  <p>Un widget que cambia su etiqueta cuando se pulsa sobre él.</p>

<code mime="application/javascript" style="numbered">#!/usr/bin/gjs

imports.gi.versions.Gtk = '3.0';

const Gio = imports.gi.Gio;
const GLib = imports.gi.GLib;
const Gtk = imports.gi.Gtk;

class ButtonExample {

    /* Create the application itself
       This boilerplate code is needed to build any GTK+ application. */
    constructor() {
        this.application = new Gtk.Application ({
            application_id: 'org.example.jsbutton',
            flags: Gio.ApplicationFlags.FLAGS_NONE
        });

        // Connect 'activate' and 'startup' signals to the callback functions
        this.application.connect('activate', this._onActivate.bind(this));
        this.application.connect('startup', this._onStartup.bind(this));
    }

    // Callback function for 'activate' signal presents windows when active
    _onActivate() {
        this._window.present ();
    }

    // Callback function for 'startup' signal initializes menus and builds the UI
    _onStartup() {
        this._buildUI();
    }

    // Build the application's UI
    _buildUI() {

        // Create the application window
            this._window = new Gtk.ApplicationWindow  ({ application: this.application,
                                                              window_position: Gtk.WindowPosition.CENTER,
                                                              title: "GNOME Button",
                                                              default_height: 50,
                                                              default_width: 250 });

        // Create the button
        this.Button = new Gtk.Button ({label: "Click Me"});
        this._window.add (this.Button);

        // Bind it to a function that says what to do when the button is clicked
        this.Button.connect ("clicked", this._clickHandler.bind(this));

                // Show the window and all child widgets
                this._window.show_all();
    }

    // Here's the function that says what happens when the button is clicked
    _clickHandler() {
        this.Button.set_label ("Clicked!");
    }
};

// Run the application
let app = new ButtonExample ();
app.application.run (ARGV);
</code>

<p>En este ejemplo se usa lo siguiente:</p>
<list>
  <item><p><link href="http://www.roojs.com/seed/gir-1.2-gtk-3.0/gjs/Gtk.Application.html">Gtk.Application</link></p></item>
  <item><p><link href="http://developer.gnome.org/gtk3/stable/GtkApplicationWindow.html">Gtk.ApplicationWindow</link></p></item>
  <item><p><link href="http://www.roojs.com/seed/gir-1.2-gtk-3.0/gjs/Gtk.Button.html">Gtk.Button</link></p></item>
</list>
</page>
