[Tkinter-discuss] window flashes rapidly

[Lynn Oliver]

So far I've only seen this problem on a Mac.  Do you recall if it was intermittent in your case, with the same code sometimes causing the behavior and other times not?

On May 2, 2012, at 12:48 AM, Michael O'Donnell wrote:

> 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
> yourself)
> 
> 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).
> 
> Mick
> 
> 
> 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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> 
> -- 
> 
> Not sent from my iPhone

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