trackingNumber
The identifier of a mouse-tracking event.
Declaration
var trackingNumber: Int { get }Discussion
This property contains either an NSTrackingArea object or an NSView.TrackingRectTag constant, depending on how AppKit generated the event. Valid mouse-tracking event types are NSMouseEntered, NSMouseExited, and NSCursorUpdate. For other types of events, accessing this property raises internalInconsistencyException.
See Also
Related Documentation
enterExitEvent(with:location:modifierFlags:timestamp:windowNumber:context:eventNumber:trackingNumber:userData:)addTrackingRect(_:owner:userData:assumeInside:)