[Tkinter-discuss] window flashes rapidly

Michael O'Donnell michael.odonnell at uam.es
Wed May 2 09:48:15 CEST 2012

Hi Lynn,

   I do remember seeing this somewhere before, but years ago,
and I think it was on a linux box (and the same code behaved well
under Windows).

What OS are you on?

Is it possible to create a short bit of code that replicates
the problem and that you can send?
(this step by itslef often reveals the problem to

Does your code do any catching of window resizing,
and on this basis of this, reformat any widgets?
(I once had a problem that in catching a window resize,
I re-arranged my panes to the new size, which in itself
caused the window resize event to be called).


On Wed, May 2, 2012 at 5:06 PM, Lynn Oliver <raycores at gmail.com> wrote:

> I'm not sure whether to describe this as a flicker or rapid flashing;
> probably what is happening is that the window is being redrawn continuously
> as fast as possible.  The visual effect is like a fast strobe.
> I don't explicitly use any pack() methods at all, but I'll take a look and
> see if that's a possibility.
> Lynn
> On May 1, 2012, at 7:42 PM, Emiliano Gavilan wrote:
> > 2012/5/1 Lynn Oliver <raycores at gmail.com>:
> >> I'm using python 2.7.2 with Tcl/Tk 8.5.11, and I'm using a lot of ttk
> themed widgets in the UI.  The layout is a ttk.notebook with a number of
> frames per tab; some tabs have frames that are created/destroyed based on
> user selections.
> >>
> >> Occasionally when I execute the program, either within the debugger or
> by itself, the entire window flashes rapidly and continues until I
> terminate the script.   I had noticed that certain dimensions in the frames
> that are dynamically replaced caused the flashing whenever I caused the
> frames to change, and by making small adjustments it seemed that I had
> eliminated the problem.
> >>
> >> However it still happens occasionally--but not repeatably on my
> system--and now I've gotten a report from a tester that it flashes on his
> system when he hasn't done anything that causes frames to be created.  As
> soon as he clicks on a certain button widget the entire UI starts flashing.
>  The same scenario doesn't cause it to flash on my system.
> >>
> >> Does anyone know what causes this?  Any suggestions for tracking down
> and eliminating the problem?
> >
> > I don't know what you mean by "flashing". If you mean that the main
> > window geometry adjusts continouosly
> > then probably you are mixing pack() and grid() methods on the same
> > master widget.
> >
> > Regards
> > Emiliano
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