public class MyWindow : Gtk.ApplicationWindow {

	Gtk.Spinner spinner;

	internal MyWindow (MyApplication app) {

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

		this.set_default_size (300, 300);

		this.border_width = 30;

		/*Spinner*/

		spinner = new Gtk.Spinner ();

		spinner.set_hexpand (true);

		spinner.set_vexpand (true);

		/*ToggleButton*/

		var togglebutton = new Gtk.ToggleButton.with_label ("Start/Stop");

		togglebutton.toggled.connect (toggled_cb);

		/*Grid*/

		var grid = new Gtk.Grid ();

		grid.set_row_homogeneous (false);

		grid.set_row_spacing (15);

		grid.attach (spinner, 0, 0, 1, 1);

		grid.attach (togglebutton, 0, 1, 1, 1);

		this.add (grid);

	}

	void toggled_cb (Gtk.ToggleButton button) {

		if (button.get_active()) {

			spinner.start ();

		}

		else {

			spinner.stop ();

		}

	}

}

public class MyApplication : Gtk.Application {

	protected override void activate () {

		//Show all the things

		new MyWindow (this).show_all ();

	}

	internal MyApplication () {

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

	}

}

public int main (string[] args) {

	return new MyApplication ().run (args);

}