LispWorks CAPI User Guide > 8 Creating Menus


8.7 Disabling menu items

A function can be specified via the :enabled-function initarg, that determines whether or not the menu, menu item, or menu component is enabled. By default, a menu object is always enabled.

Consider the following example:

(defvar *on* nil)
 (make-instance 'menu
                 :title "Foo"
                 #'(lambda (menu) *on*))
                 :title "Bar"))))

Figure 8.7 A menu with a disabled menu item

Changing the value of *on* between t and nil in the Listener, using setq , results in the menu item changing between the enabled and disabled states.

8.7.1 Dialogs and disabled menu items

LispWorks CAPI User Guide (Windows version) - 22 Dec 2009