Re: [MACTCL] ttk.Scrollbar in Notebook widget freezes

[Kevin W. <kw...@co...>]

On 5/31/12 7:56 PM, Ned Deily wrote:
> Another data point, FWIW: I just tried the OP's test with Python 3.2.3
> linked with an X11 Tk 8.5 (a current MacPorts Python 3.2.3) rather than
> the python.org 3.2.3 linked with A/S Aqua Cocoa Tk 8.5.11.  While I was
> easily able to reproduce the problem with the latter, I could not
> reproduce with the former.

My guess is that the symptoms the OP are reporting are related to this bug:

http://sourceforge.net/tracker/?func=detail&aid=3166688&group_id=12997&atid=112997

I had originally said in the comments to that bug that it may simply be 
a difference in performance between Cocoa and Carbon, and Cocoa / X11, 
but I think it goes deeper than this, into some very low-level issues 
with the event loop integration between Cocoa and Tk, which affects 
things like screen redraw. I go into those issues here:

http://sourceforge.net/mailarchive/message.php?msg_id=27868831

Bottom line, these issues are most likely insoluable without some 
significant re-architecting of the event loop integration between Cocoa 
and Tk--a task that is beyond my skills. The original author of the 
Tk-Cocoa port, Daniel Steffen, is no longer able to devote significant 
time to maintaining the port because of his employment at Apple, 
certainly not the level of time required to make changes to the event 
loop.  As I mention in my archived message, it's sometimes possible to 
work around the screen redraw issues through judicious use of "after" 
and "update idletasks" commands, but that's often a matter of trial and 
error.

I'm sorry I'm not able to provide further guidance on this or make a 
more substantial effort to tackle these bugs. As I've said before on 
this mailing list, patches are welcome, but no one has stepped forward 
to offer one in this particular case.

Thanks,
Kevin

-- 
Kevin Walzer
Code by Kevin
http://www.codebykevin.com