... Events are sent to your application to indicate changes in a GdkWindow or user actions you might be interested in. ... struct _GdkEventAny { GdkEventType type; GdkWindow *window; gint8 send_event; }; . ... The GTK+ main loop calls gtk_widget_event() to deliver an event to a widget; this function first emits the "event" signal, then emits a signal for the specific event type (if appropriate). ... When a toplevel GtkWindow widget receives key events, it forwards them to the widget with GTK+'s focus. ...