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

  <info>

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

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

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

    <credit type="author copyright">

      <name>Tiffany Antopolski</name>

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

      <years>2012</years>

    </credit>

    <desc>Unha xanela de mensaxe</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>MessageDialog</title>

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

  
A modal message dialog which can cause the world to explode.

//A window in the application

public class Window : Gtk.ApplicationWindow {

	public Window (Application app) {

		Object (application: app, title: "Gtk.MessageDialog Example");

		var label = new Gtk.Label ("This application goes boom!");

		this.add (label);

		var message_action = new SimpleAction ("message", null);

		message_action.activate.connect (message);

		this.add_action (message_action);

		this.set_default_size (400, 200);

		this.show_all ();

	}

	void dialog_response (Gtk.Dialog dialog, int response_id) {

		switch (response_id) {

			case Gtk.ResponseType.OK:

				print ("*boom*\n");

				break;

			case Gtk.ResponseType.CANCEL:

				print ("good choice\n");

				break;

			case Gtk.ResponseType.DELETE_EVENT:

				print ("dialog closed or cancelled\n");

				break;

		}

			dialog.destroy();

	}

	void message (SimpleAction simple, Variant? parameter) {

		var messagedialog = new Gtk.MessageDialog (this,

                            Gtk.DialogFlags.MODAL,

                            Gtk.MessageType.WARNING,

                            Gtk.ButtonsType.OK_CANCEL,

                            "This action will cause the universe to stop existing.");

		messagedialog.response.connect (dialog_response);

		messagedialog.show ();

	}

}

//This is the Application

public class Application : Gtk.Application {

	protected override void activate () {

		new Window (this);

	}

	protected override void startup () {

		base.startup ();

		var menu = new Menu ();

		menu.append ("Message", "win.message");

		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);

	}

	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.ResponseType.html">Gtk.ResponseType</link>
</item>

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

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

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

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

</list>

</page>