Represents the orientation of widgets which can be switched between horizontal and vertical orientation on the fly, like the gtk-toolbar widget.

(define-g-enum "GtkOrientation" gtk-orientation
  (:export t
   :type-initializer "gtk_orientation_get_type")
  (:horizontal 0)
  (:vertical 1))  

:horizontal

The widget is in horizontal orientation.

:vertical

The widget is in vertical orientation.