gio:property-action-parameter-type (object)

object -- a g:property-action object
type -- a g:variant-type parameter type

The type of the parameter that must be given when activating the action.

(defvar label (make-instance 'gtk:label))
=> LABEL
(defvar action (g:property-action-new "action" label "xalign"))
=> ACTION
(g:property-action-parameter-type action)
=> #<GLIB:VARIANT-TYPE {10023AE493}>
(g:variant-type-dup-string *)
=> "d"