Used to change the appearance of an outline typically provided by a gtk-frame widget.

Note that many themes do not differentiate the appearance of the various shadow types: Either their is no visible shadow :none, or there is any other value.

(define-g-enum "GtkShadowType" gtk-shadow-type
  (:export t
   :type-initializer "gtk_shadow_type_get_type")
  (:none 0)
  (:in 1)
  (:out 2)
  (:etched-in 3)
  (:etched-out 4))  

:none

No outline.

:in

The outline is bevelled inwards.

:out

The outline is bevelled outwards like a button.

:etched-in

The outline has a sunken 3d appearance.

:etched-out

The outline has a raised 3d appearance.