Select multiple items in listbox

[M76]

I'm trying to create a listbox with dcl, to be able to select multiple items. But I can't find any hint how to go about it, the only example I could find in autocad is this:

 

(defun selectItem( lstItems dcl-fileName dialogName / dcl_id LT lstLinkTemplates selectedItem)

 (setq dcl_id (load_dialog dcl-filename))      ; Load the DCL file 

 (if (not (new_dialog dialogName dcl_id))      ; Initialize the dialog 
     (progn
(princ (strcat "\n " dcl-filename " dialog not found.\n"))
(exit)                                   ; Exit if this doesn't work
     )
 )


 ;; Construct list of items
 (start_list "selections")                  ; Specify the name of the list box 
     (mapcar 'add_list lstItems)            ; Specify the AutoLISP list 
 (end_list)

 ;;
 ;;
 (defun getItemSelection()
   (setq selectedItem (nth (atoi $value) lstItems)  )
   (if (equal 4 $reason)		; Then user double-clicked item.
(done_dialog))
 )

 ;;
 ;; Confirms that user selected an item and that the item exists in list
 ;;
 (defun check_i()
   (if (member selectedItem lstItems)
     (progn 
       (set_tile "error" "") 
       T
     )
     (progn 
       (set_tile "error" "Please select an item.")
       nil
     )
   )
 )

  (action_tile "selections" "(getItemselection)")
 (action_tile "accept"     "(if (check_i)(done_dialog 1))")
 (action_tile "cancel"     "(setq selectedItem nil)(done_dialog 0)(exit)")


 (start_dialog)                             ; Display the dialog box 

 (unload_dialog dcl_id)                     ; Unload the DCL file 

 (princ "\n")

 selectedItem				; Return this value.
)

 

But as I understand this only allows one selection in the listbox, how can I allow multiple selections?

 

And what are the $value $reason variables, is there an explanation about this somewhere?

[MSasu]

Please check this thread:

http://www.cadtutor.net/forum/showthread.php?t=44639

 

Regards,

[Lee Mac]

mutiple_select = true;

 

As for the $value etc, look at:

 

Working with Programmable Dialog Boxes > Managing Dialog Boxes > Action Expressions and Callbacks

 

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