At Sat, 30 Nov 2013 08:18:59 +1100, Daniel Prager wrote: > Am I right in thinking that while you can add a callback to respond > the on-paint event of canvas% at construction time, i.e.. > > (new canvas% ... > [paint-callback (lambda (c e) ...)]) > > to respond to other events -- mouse, keyboard, etc. -- it is necessary to > sub-class? > > E.g. > > (define my-canvas% > (class canvas% > (define/override (on-event ev) > (when (send ev button-down? 'left) > ; do something > (super-new))) > > Or are there alternatives?
No, that's the only way, currently. ____________________ Racket Users list: http://lists.racket-lang.org/users
