Gtk.Widget::window-state-event

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

The ::window-state-event will be emitted when the state of the toplevel window associated to the @widget changes.

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.EventWindowState which triggered this signal.
Returns: true to stop other handlers from being invoked for the event. false to propagate the event further.