#enum GtkShadowType
#Used to change the appearance of an outline typically provided by a GtkFrame.
#@https://developer.gnome.org/gtk3/3.2/gtk3-Standard-Enumerations.html#GtkShadowType
extern class GtkShadowType `{GtkShadowType`}
	#No outline.
	new none `{ return GTK_SHADOW_NONE; `}

	#The outline is bevelled inwards.
	new shadow_in `{ return GTK_SHADOW_IN; `}

	#The outline is bevelled outwards like a button.
	new shadow_out `{ return GTK_SHADOW_OUT; `}

	#The outline has a sunken 3d appearance.
	new etched_id `{ return GTK_SHADOW_ETCHED_IN; `}

	#The outline has a raised 3d appearance.
	new etched_out `{ return GTK_SHADOW_ETCHED_OUT; `}
end