crossing because of a device switch (i.e. a mouse taking control of the pointer after a touch device), this event is synthetic as the pointer didn’t leave the surface.
crossing because a grab is activated.
crossing because a GTK grab is activated.
crossing because a GTK grab is deactivated.
crossing because of pointer motion.
crossing because a GTK widget changed state (e.g. sensitivity).
crossing because a touch sequence has begun, this event is synthetic as the pointer might have not left the surface.
crossing because a touch sequence has ended, this event is synthetic as the pointer might have not left the surface.
crossing because a grab is deactivated.
Specifies the crossing mode for enter and leave events.