17 Mar
2008
17 Mar
'08
10:59 p.m.
Two questions... 1) What's the best way to remove an observer that's been set on some slot? 2) If there's an observer like (defobserver image-files ((self widget)) (loop for (name file-pathname) in (set-difference new-value old-value :key 'car) do (tk-format `(:pre-make-tk ,self) "image create photo ~(~a.~a~) -file {~a} -height ~a -width ~a" (^path) name (namestring file-pathname) (^height)(^width)))) ....can I make one that specializes on a subclass of widget that overrides the first? How does one do this? -- Andy