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/usr/lib/gcl-2.6.12/gcl-tk/demos/mkdialog.lisp is in gcl 2.6.12-47.

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;;# mkDialog w msgArgs list list '...
(in-package "TK")
;;
;; Create a dialog box with a message and any number of buttons at
;; the bottom.
;;
;; Arguments:
;;    w -	Name to use for new top-level window.
;;    msgArgs -	List of arguments to use when creating the message of the
;;		dialog box (e.g. :text, justifcation, etc.)
;;    list -	A two-element list that describes one of the buttons that
;;		will appear at the bottom of the dialog.  The first element
;;		gives the text to be displayed in the button and the second
;;		gives the command to be invoked when the button is invoked.

(defun mkDialog (w msgArgs &rest  args) 
    (if (winfo :exists w :return 'boolean) (destroy w))
    (toplevel w :class "Dialog")
    (wm :title w "Dialog box")
    (wm :iconname w "Dialog")

    ;; Create two frames in the main window. The top frame will hold the
    ;; message and the bottom one will hold the buttons.  Arrange them
    ;; one above the other, with any extra vertical space split between
    ;; them.

    (frame (conc w '.top) :relief "raised" :border 1)
    (frame (conc w '.bot) :relief "raised" :border 1)
    (pack (conc w '.top) (conc w '.bot) :side "top" :fill "both" :expand "yes")

    ;; Create the message widget and arrange for it to be centered in the
    ;; top frame.
    
    (apply 'message (conc w '.top.msg) :justify "center" 
	    :font :Adobe-times-medium-r-normal--*-180* msgArgs)
    (pack (conc w '.top.msg) :side "top" :expand "yes" :padx 3 :pady 3)

    ;; Create as many buttons as needed and arrange them from left to right
    ;; in the bottom frame.  Embed the left button in an additional sunken
    ;; frame to indicate that it is the default button, and arrange for that
    ;; button to be invoked as the default action for clicks and returns in
    ;; the dialog.

    (if (> (length args)  0)
	(let ((i 1) arg)
	  (setq arg (nth 0  args))
	  (frame (conc w '.bot.0) :relief "sunken" :border 1)
	  (pack (conc w '.bot.0) :side "left" :expand "yes" :padx 10 :pady 10)
	  (button (conc w '.bot.0.button) :text (nth 0 arg)
		  :command `(progn ,(nth 1 arg)(destroy ',w)))
	  (pack (conc w '.bot.0.button) :expand "yes" :padx 6 :pady 6)
	  (bind w "<Return>" `(progn ,(nth 1 arg)(destroy ',w)))
	  (focus w)
	  (dolist (arg (cdr args))
		  (setq i (+ i 1))	
		  (button (conc w '.bot. i) :text (nth 0 arg)
			  :command `(progn ,(nth 1 arg)(destroy ',w)))
		  (pack (conc w '.bot. i) :side "left" :expand "yes" :padx 10)
		  
		  )
	  ))
    (bind w "<Any-Enter>" `(focus ',w))
    (focus w)
)