public class MyWindow : Gtk.ApplicationWindow {

	Gtk.Widget spinner;

	internal MyWindow (MyApplication app) {

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

		this.set_default_size (200, 200);

		this.border_width = 30;

		spinner = new Gtk.Spinner ();

		this.add (spinner);

		(spinner as Gtk.Spinner).active = true;

		spinner.show ();

	}

	protected override bool key_press_event (Gdk.EventKey event) {

		//print (Gdk.keyval_name(event.keyval) +"\n");

		if (Gdk.keyval_name(event.keyval) == "space") {

			if ((spinner as Gtk.Spinner).active) {

				(spinner as Gtk.Spinner).stop ();

				//spinner.visible = false;

			}

			else {

				(spinner as Gtk.Spinner).start ();

				//spinner.visible = true;

			}

		}

		return true;

	}

}

public class MyApplication : Gtk.Application {

	protected override void activate () {

		MyWindow window = new MyWindow (this);

		window.show ();

	}

	internal MyApplication () {

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

	}

}

public int main (string[] args) {

	return new MyApplication ().run (args);

}