[racket] Graphical Toolkit change question

From: Matthew Flatt (mflatt at cs.utah.edu)
Date: Mon Feb 21 07:49:53 EST 2011

I'm suggesting that `on-paint' could be added to panels, where
overriding `on-paint' would let you configure the drawing of a panel
behind its children.

So, if `on-paint' were added to panels, would that help to implement
your application?

At Mon, 21 Feb 2011 09:28:23 +0100, "Christophe Vandenberghe" wrote:
> "on-paint" for panels? How would that work? On-paint only exists for canvasses 
> and editors.
> -----Original Message-----
> From: Matthew Flatt [mailto:mflatt at cs.utah.edu] 
> Sent: vrijdag 18 februari 2011 18:26
> To: Christophe Vandenberghe
> Cc: users at racket-lang.org
> Subject: Re: [racket] Graphical Toolkit change question
> At Thu, 17 Feb 2011 20:08:10 -0700, Matthew Flatt wrote:
> > We've never tried to pin down the behavior of overlapping children in a
> > panel, and it varies among platforms. Actually, we tried long ago to
> > make the order consistent, and there were too many problems on some
> > platforms.
> > 
> > I think those old obstacles are gone in the new implementation, so
> > maybe we can pin this down and/or provide methods to control the order.
> Nope. The drawing of overlapping siblings in Cocoa is apparently
> unspecified.
> A more promising direction is probably something like `on-paint' for
> panels. Would that work for your application?
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