Hi Kenny,

I never quite finished that expander stuff when I was doing it before. I ran into difficulties with the up/down icons but I think I know how to fix that now. However there seems to be another problem. If you try evaluate the test-window form at the bottom, every second time, you get "Tcl Error: out of stack space". I think there must be something that needs to be destroyed somewhere but none of the other composite widgets seem to have to do that.

Any ideas?

(defmodel expander (frame-stack) ((label :initarg :label :accessor label :initform (c-in nil)) (expansion :initarg :expansion :accessor expansion :initform nil) (expanded :initarg :expanded :accessor expanded :initform (c-in nil))) (:default-initargs :fm-parent (error "expander widget must have some kind of parent")))

(defmacro mk-expander ((&rest inits) &body body) `(make-instance 'expander ,@inits :fm-parent *parent* :expansion (c? (the-kids ,@body)) :expanded (c-in t) :kids (c? (the-kids (mk-button-ex ((^label) (setf (expanded (upper self expander)) (not (expanded (upper self expander)))))) (^expansion))) :kids-packing (c? (when (^kids) (if (^expanded) (format nil "pack~{ ~a~} -side top -anchor nw -padx ~a -pady ~a" (mapcar 'path (^kids)) (^padx) (^pady))

(format nil "pack forget~{ ~a~}" (mapcar 'path (cdr (^kids)))))))))

(defmodel expander-test (window) () (:default-initargs :kids (c? (the-kids (mk-stack (:packing (c?pack-self)) (mk-expander (:label "hi") (mk-label :text "hi") (mk-label :text "ho")))))))

(test-window 'expander-test)