-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 10/07/11 14:17, Matthew Flatt wrote: > At Fri, 07 Oct 2011 13:06:23 +0200, Marijn wrote: >> I've prepared a chopped-down attempt which defines an editor, an >> administrator and a display class and instantiates them. >> >> Unfortunately the editor doesn't appear on the screen where I >> thought I'd let the administrator tell it to appear. >> >> I'm not sure why it doesn't work. Any help? > > All windowing events go to the `canvas%', and the built-in canvas > methods know nothing about your editor admin. You need to override > `on-paint' to pass on the message to the editor, `on-focus' to > notify the editor, `on-event' to send events on to the editor, and > so on. > > See enclosed. > > I changed the direct calls to `refresh' to instead send `refresh' > to the canvas, and then the canvas's `on-paint' calls the editor's > `refresh'. Otherwise, you have to erase the area for the editor > before redrawing the editor, and the windowing system is usually > better at scheduling the refresh.
Thanks Matthew, that is immensely helpful! Marijn -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk6O+EYACgkQp/VmCx0OL2xNgwCghqLL0KAwIe2729BRsVWbCuo2 AWMAniW+cnfnGNTAlcmF5RfNWnLkbvcG =Fv1F -----END PGP SIGNATURE----- _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users