gdk/gdk.go
func EventButtonNewFromEvent(event *Event) *EventButton {
	ee := (*C.GdkEvent)(unsafe.Pointer(event.native()))
	ev := Event{ee}
	return &EventButton{&ev}
}
func EventButtonNewFromEvent(event *Event) *EventButton {
	ee := (*C.GdkEvent)(unsafe.Pointer(event.native()))
	ev := Event{ee}
	return &EventButton{&ev}
}
// EventButtonNewFromEvent returns an EventButton from an Event.
//
// Using widget.Connect() for a key related signal such as
// "button-press-event" results in a *Event being passed as
// the callback's second argument. The argument is actually a
// *EventButton. EventButtonNewFromEvent provides a means of creating
// an EventKey from the Event.