GDK Event handlers:

•	Focus events: on-focus-in ( win event user-data -- ? ) on-focus-out ( win event user-data -- ? ) on-leave ( win event user-data -- ? )
•	IM events: im-on-destroy ( win im-context -- ) im-on-focus-in ( win event im-context -- ? ) im-on-focus-out ( win event im-context -- ? ) im-on-key-event ( win event im-context -- ? ) on-commit ( im-context str win -- ) on-delete-surrounding ( im-context offset n win -- ? ) on-retrieve-surrounding ( im-context win -- ? )
•	Keyboard events: on-key-press/release ( win event user-data -- ? )
•	Mouse events: on-button-press ( win event user-data -- ? ) on-button-release ( win event user-data -- ? ) on-motion ( win event user-data -- ? ) on-scroll ( win event user-data -- ? )
•	Window sizing and visibility events: on-configure ( window event user-data -- ? ) on-delete ( win event user-data -- ? ) on-expose ( win event user-data -- ? ) on-map ( win event user-data -- ? )