<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="aboutdialog.vala" xml:lang="gl">

  <info>

  <title type="text">AboutDialog (Vala)</title>

    <link type="guide" xref="beginner.vala#windows"/>

    <link type="seealso" xref="button.vala"/>

    <link type="seealso" xref="linkbutton.vala"/>

    <revision version="0.1" date="2012-04-07" status="stub"/>

    <credit type="author copyright">

      <name>Ryan Lortie</name>

      <email its:translate="no">desrt@desrt.ca</email>

      <years>2012</years>

    </credit>

    <credit type="author">

      <name>Tiffany Antopolski</name>

      <email its:translate="no">tiffany.antopolski@gmail.com</email>

    </credit>

    <desc>Mostrar información sobre un aplicativo</desc>

    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">

      <mal:name>Fran Dieguez</mal:name>

      <mal:email>frandieguez@gnome.org</mal:email>

      <mal:years>2012-2013.</mal:years>

    </mal:credit>

  </info>

  <title>AboutDialog</title>

  <media type="image" mime="image/png" src="media/aboutdialog_GMenu.png"/>

  
Un exemplo de AboutDialog usando Gtk.ApplicationWindow e Menu

  <note>
You need to be running Gtk3.4 or later for this to work
</note>

/* A window in the application */

public class Window : Gtk.ApplicationWindow {

	/* The constructor */

	public Window (Application app) {

		Object (application: app, title: "AboutDialog Example");

		var about_action = new SimpleAction ("about", null);

		about_action.activate.connect (this.about_cb);

		this.add_action (about_action);

		this.show_all ();

	}

	/* This is the callback function connected to the 'activate' signal

	 * of the SimpleAction about_action.

	 */

	void about_cb (SimpleAction simple, Variant? parameter) {

		string[] authors = { "GNOME Documentation Team", null };

		string[] documenters = { "GNOME Documentation Team", null };

		Gtk.show_about_dialog (this,

                               "program-name", ("GtkApplication Example"),

                               "copyright", ("Copyright \xc2\xa9 2012 GNOME Documentation Team"),

                               "authors", authors,

                               "documenters", documenters,

                               "website", "http://developer.gnome.org",

                               "website-label", ("GNOME Developer Website"),

                               null);

	}

}

/* This is the Application */

public class Application : Gtk.Application {

	/* Here we override the activate signal of GLib.Application */

	protected override void activate () {

		new Window (this);

	}

	/* Here we override the startup signal of GLib.Application */

	protected override void startup () {

		base.startup ();

		var menu = new Menu ();

		menu.append ("About", "win.about");

		menu.append ("Quit", "app.quit");

		this.app_menu = menu;

		var quit_action = new SimpleAction ("quit", null);

		//quit_action.activate.connect (this.quit);

		this.add_action (quit_action);

	}

	/* The constructor */

	public Application () {

		Object (application_id: "org.example.application");

	}

}

/* main function creates Application and runs it */

int main (string[] args) {

	return new Application ().run (args);

}

Neste exemplo empregaremos o seguinte:

<list>

  <item>
<link href="http://www.valadoc.org/gtk+-3.0/Gtk.Application.html">Gtk.Application</link>
</item>

  <item>
<link href="http://www.valadoc.org/gtk+-3.0/Gtk.ApplicationWindow.html">Gtk.ApplicationWindow</link>
</item>

  <item>
<link href="http://www.valadoc.org/gtk+-3.0/Gtk.Window.set_default_size.html">set_default_size</link>
</item>

</list>

</page>