GTK 4.0 PopoverMenuBar w/ DBus

popovermenu-dbus.vala

/**
 * GTK 4 Popover Menubar with DBus
 *
 * Compile: valac popovermenu-dbus.vala --pkg gtk4 --pkg gio-2.0 --pkg gio-unix-2.0
 */

namespace Example {
	private static string? dbus_id;
	private static string? dbus_obj;

	private const GLib.OptionEntry[] options = {
		{ "dbus-id", '\0', GLib.OptionFlags.NONE, GLib.OptionArg.STRING, ref dbus_id, "The ID of the DBus application to use", "ID" },
		{ "dbus-obj", '\0', GLib.OptionFlags.NONE, GLib.OptionArg.STRING, ref dbus_obj, "The object path of the DBus application to use", "OBJ_PATH" },
		{ null }
	};

	public class ExampleApp : Gtk.Application {
		public ExampleApp() {
			Object(application_id: "com.example.application");

			this.add_main_option_entries(options);
		}

		public override void startup() {
			base.startup();

			var action = new GLib.SimpleAction("test", null);
			action.activate.connect(() => {
				stdout.printf("Received event\n");
			});
			this.add_action(action);

			var menu = new GLib.Menu();
			var submenu = new GLib.Menu();
			submenu.append("Test", "app.test");
			menu.append_submenu("Application", submenu);
			this.set_menubar(menu);
		}

		public override void activate() {
			base.activate();

			if (this.get_windows().is_empty()) {
				new ExampleWin(this).show();
			} else {
				this.get_windows().first().data.present();
			}
		}
	}

	public class ExampleWin : Gtk.ApplicationWindow {
		public ExampleWin(Gtk.Application application) {
			Object(application: application);

			this.title = "GTK 4.0 Popover Menubar DBus";

			var conn = this.application.get_dbus_connection();
			var id = dbus_id == null ? this.application.get_application_id() : dbus_id;
			var obj_path = dbus_obj == null ? this.application.get_dbus_object_path() : dbus_obj;

			var menubar = new Gtk.PopoverMenuBar.from_model(new GLib.Menu());
			menubar.set_menu_model(GLib.DBusMenuModel.@get(conn, id, obj_path + "/menus/menubar"));
			menubar.insert_action_group("app", GLib.DBusActionGroup.@get(conn, id, obj_path));

			var box = new Gtk.CenterBox();
			box.set_center_widget(menubar);
			this.set_child(box);
		}
	}

	public static int main(string[] args) {
		Gtk.init();
		return new ExampleApp().run(args);
	}
}