Re: [wxhaskell-users] Unbuffering gui updates

[Fergus W. <fer...@ya...>]

--- On Sun, 6/6/10, Fernando Benavides <gre...@gm...> wrote:
> I run into the same issue in the
> development of hpage.  The workaround I've found is to
> have a refresh timer ticking every (say) 100ms, something
> like:
> 
> _timer <- timer [interval := 100, on command := return
> ()]
> 
> Hope this helps.
> 
> PS: If I remeber well, I wrote a longer mail a while ago
> talking about this :)

Would that be this message?:

http://www.mail-archive.com/wxh...@li.../msg00840.html

I think that's done the trick!  After I'd stared blankly at this for a while, the penny dropped: the fix, if I'm following this right, is to do the GUI update asynchronously (i.e. in a forkIO), _and_ to use a timer of the desired granularity, as above.  This seems to work (though unfortunately also causes inconsistent updates violating a program invariant, a "freeHaskellFunctionPtr: not for me, guv!" error, and periodically a segmentation fault (I think this probably relates to combining concurrency and mutable variables, which I need to go fix next)).

Cheers,
Alex.