code: func EventWindowStateNewFromEvent(event *Event) *EventWindowState {
  	ee := (*C.GdkEvent)(unsafe.Pointer(event.native()))
  	ev := Event{ee}
  	return &EventWindowState{&ev}
  }
docs: // EventWindowStateNewFromEvent returns an EventWindowState from an Event.
  //
  // Using widget.Connect() for the
  // "window-state-event" signal results in a *Event being passed as
  // the callback's second argument. The argument is actually a
  // *EventWindowState. EventWindowStateNewFromEvent provides a means of creating
  // an EventWindowState from the Event.