Gtk.Widget::configure-event

function callback(widget, event:Gdk.EventConfigure, ):Boolean;

The ::configure-event signal will be emitted when the size, position or stacking of the @widget's window has changed.

To receive this signal, the Gdk.Window associated to the widget needs to enable the #GDK_STRUCTURE_MASK mask. GDK will enable this mask automatically for all new windows.

widget: instance of Gtk.Widget that is emitting the signal
event: the Gdk.EventConfigure which triggered this signal.
Returns: true to stop other handlers from being invoked for the event. false to propagate the event further.