gdk:display-default ()

The gdk:display object, or nil if there is no default display.

Gets the default display. This is a convenience function for the call:

(gdk:display-manager-default-display (gdk:display-manager-get))  

(gdk:display-default)
=> #<GDK:DISPLAY {1007501013}>
(eq (gdk:display-default)
    (gdk:display-manager-default-display (gdk:display-manager-get)))
=> T