[plt-scheme] on-paint event overriding ?!

From: Matthew Flatt (mflatt at cs.utah.edu)
Date: Tue Dec 3 10:52:41 EST 2002

At Wed, 27 Nov 2002 23:25:49 -0500, Jean-Daniel Rondeau wrote:
> I am trying to draw some lines on a table (make-table). The fact is
> that when I lose the focus of the window (the table here...) all my
> lines disapear and only the cards (from the "cards.ss" library) are
> left on the table.

I don't think the interface to the library currently lets you add
drawing to the table, but that would be a good addition.

I've added a new kind of region --- a "background region" --- that
doesn't repond to clicks, but that supports a background-painting

The changed files for plt/collects/games/cards are committed in CVS,
and also here:


> My question is : How can I "add" my code to the on-paint event for
> the "table". I know that I can override the event. But can I keep the
> default code and add my code to it ?!? How ?!?

Actually, I'm not sure how you'd override event handling in the current
interface. `make-table' gives you an instance without any control over
the instantiated class. In any case, maybe the above change willtake
care of things.


Posted on the users mailing list.