gdk:drag-action-is-unique (action)

action -- a gdk:drag-action value

True if exactly one action was given.

Checks if action represents a single action or if it includes multiple flags that can be selected from. When action is :none, that is no action was given, true is returned.

(gdk:drag-action-is-unique :move) => T
(gdk:drag-action-is-unique '(:move :copy)) => NIL
(gdk:drag-action-is-unique :none) => T