An opaque Carbon type associated with this event.
- macOS 10.5+
This method is valid for all types of events. The
Event object is retained by the receiver, so it is valid as long as the
NSEvent object is valid, and is released when the
NSEvent object is freed. You can use RetainEvent(_:) to extend the lifetime of the
Event object, with a corresponding ReleaseEvent(_:) when you are done with it.
The system typically creates user-input events with an associated
NSEvent objects create an
Event when this property is first accessed, if possible. If there is no equivalent
NSEvent for this event, the property is set to