MessageDialog

MessageDialog presents a dialog with some message text.

It’s simply a convenience widget; you could construct the equivalent of MessageDialog from Dialog without too much effort, but MessageDialog saves typing.

One difference from Dialog is that MessageDialog sets the skip_taskbar_hint property to true, so that the dialog is hidden from the taskbar by default.

The easiest way to do a modal message dialog is to use run, though you can also pass in the gtk_dialog_modal flag, run automatically makes the dialog modal and waits for the user to respond to it. run returns when any dialog button is clicked.

An example for using a modal dialog:

 GtkDialogFlags flags = GTK_DIALOG_DESTROY_WITH_PARENT;
 dialog = gtk_message_dialog_new (parent_window,
                                  flags,
                                  GTK_MESSAGE_ERROR,
                                  GTK_BUTTONS_CLOSE,
                                  "Error reading “%s”: %s",
                                  filename,
                                  g_strerror (errno));
 gtk_dialog_run (GTK_DIALOG (dialog));
 gtk_widget_destroy (dialog);

u might do a non-modal MessageDialog as follows:

An example for a non-modal dialog:

 GtkDialogFlags flags = GTK_DIALOG_DESTROY_WITH_PARENT;
 dialog = gtk_message_dialog_new (parent_window,
                                  flags,
                                  GTK_MESSAGE_ERROR,
                                  GTK_BUTTONS_CLOSE,
                                  "Error reading “%s”: %s",
                                  filename,
                                  g_strerror (errno));

 // Destroy the dialog when the user responds to it
 // (e.g. clicks a button)

 g_signal_connect_swapped (dialog, "response",
                           G_CALLBACK (gtk_widget_destroy),
                           dialog);

GtkMessageDialog as GtkBuildable

The GtkMessageDialog implementation of the GtkBuildable interface exposes the message area as an internal child with the name “message_area”.

Example: MessageDialog:

public class Application : Gtk.Window {
	public Application () {
		// Prepare Gtk.Window:
		this.title = "My Gtk.MessageDialog";
		this.window_position = Gtk.WindowPosition.CENTER;
		this.destroy.connect (Gtk.main_quit);
		this.set_default_size (350, 70);

		// The MessageDialog
		Gtk.MessageDialog msg = new Gtk.MessageDialog (this, Gtk.DialogFlags.MODAL, Gtk.MessageType.WARNING, Gtk.ButtonsType.OK_CANCEL, "My message!");
			msg.response.connect ((response_id) => {
			switch (response_id) {
				case Gtk.ResponseType.OK:
					print ("Ok\n");
					break;
				case Gtk.ResponseType.CANCEL:
					print ("Cancel\n");
					break;
				case Gtk.ResponseType.DELETE_EVENT:
					print ("Delete\n");
					break;
			}

			msg.destroy();
		});
		msg.show ();
	}

	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.MessageDialog.vala