propagateEvent

Sends an event to a widget, propagating the event to parent widgets if the event remains unhandled.

Events received by GTK+ from GDK normally begin in gtk.global.mainDoEvent. Depending on the type of event, existence of modal dialogs, grabs, etc., the event may be propagated; if so, this function is used.

gtk.global.propagateEvent calls gtk.widget.Widget.event on each widget it decides to send the event to. So gtk.widget.Widget.event is the lowest-level function; it simply emits the #GtkWidget::event and possibly an event-specific signal on a widget. gtk.global.propagateEvent is a bit higher-level, and gtk.global.mainDoEvent is the highest level.

All that said, you most likely don’t want to use any of these functions; synthesizing events is rarely needed. There are almost certainly better ways to achieve your goals. For example, use gdk.window.Window.invalidateRect or gtk.widget.Widget.queueDraw instead of making up expose events.