A GtkSpinner widget displays an icon-size spinning animation.

It is often used as an alternative to a ProgressBar for displaying indefinite activity, instead of actual progress.

To start the animation, use start, to stop it use stop.

CSS nodes

GtkSpinner has a single CSS node with the name spinner. When the animation is active, the GtkSpinner:checked pseudoclass is added to this node.

Example: Spinner:

public class Application : Gtk.Window {
	public Application () {
		// Prepare Gtk.Window:
		this.title = "My Gtk.Spinner";
		this.window_position = Gtk.WindowPosition.CENTER;
		this.destroy.connect (Gtk.main_quit);
		this.set_default_size (400, 400);

		// Create & add a new spinner:
		Gtk.Spinner spinner = new Gtk.Spinner ();
		spinner.active = true;
		this.add (spinner);
	}

	public static int main (string[] args) {
		Gtk.init (ref args);

		Application app = new Application ();
		app.show_all ();
		Gtk.main ();
		return 0;
	}
}

valac --pkg gtk+-3.0 Gtk.Spinner.vala