Re: pTk Scrolled Text problem

My thanks to everyone for all your suggestions...  I'll make the 
horizontal bar fixed and try an optional vertical bar...
I can't have the text wrap since it is tabular output from a telnet
session...

As Ala said, they may be evil but it gives the UI a nice look.  If you
don't need them, they don't clutter the UI...  Guess a 50% cluttering
will have to suffice.

Should this be a bug opened against the core Tcl/Tk interface if
that is where the problem lies?

On Wed, 2005-12-14 at 22:58 +0100, Slaven Rezic wrote:
> "Konovalov, Vadim" <[email protected]> writes:
> 
> > > Here is a script that will show the problem...  When it starts up it
> > > will consume 100% cpu due to the scrollbar attempting to redraw...
> > > Watch the thumb bounce up and down in the scroll region.
> >
> > this problem is in perl/Tk and does not appear to be in Tcl/Tk.
> > Because if I replace many "use Tk; use Tk::something" with single
> >
> >   use Tcl::Tk qw(:perlTk);
> >
> > , the problem does not appear.
> >
> > As a side note, following lines in that script are inessential but
> > incorrect:
> >
> > # subroutine declarations, needed by strict setting
> > use subs qw( CreateMainUI );
> >
> > removing those do not influence breakage
> >
> 
> Sorry, same problem with Tcl::Tk 0.88 + Tcl 0.88 on a FreeBSD/XFre86
> system. I think that the length of the inserted text is crucial for
> the problem to appear. So if your're on a Windows system, you have to
> insert different text to make the problem occur.
> 
> Interestingly, after a few iterations the Tcl interpreter dies:
> 
> too many nested evaluations (infinite loop?)
>     while executing
> "place .sc02._grid.vscroll -relwidth 1.0 -relheight 1.0 -in .sc02._grid.vframe -
> x 1 -y 0 -width -1"
>     ("eval" body line 1)
>     invoked from within
> "eval place $sb $args"
>     (procedure "ScrolledWindow::_setSBSize" line 3)
>     invoked from within
> "ScrolledWindow::_setSBSize .sc02._grid.vscroll 13 -relwidth 1.0 -relheight 1.0 
> -in .sc02._grid.vframe -x 1 -y 0 -width -1"
>     (command bound to event)
> too many nested evaluations (infinite loop?)
>     while executing
> "ScrolledWindow::_setSBSize .sc02._grid.vscroll 13 -relwidth 1.0 -relheight 1.0 
> -in .sc02._grid.vframe -x 1 -y 0 -width -1"
>     (command bound to event)
> too many nested evaluations (infinite loop?)
>     while executing
> "ScrolledWindow::_set_vscroll .sc02 0 0.454545"
>     (vertical scrolling command executed by text)
> too many nested evaluations (infinite loop?)
>     while executing
> "ScrolledWindow::_set_hscroll .sc02 0 1"
>     (horizontal scrolling command executed by text)
> 
> I usually avoid using two optional scrollbars because of this problem.
> Best is to make one of the two fixed, or to set word/character
> wrapping to on, so there's no need for a horizontal scrollbar.
> 
> Regards,
>         Slaven
> 
> --
> Slaven Rezic - slaven <at> rezic <dot> de
> 
>     tksm - Perl/Tk program for searching and replacing in multiple files
>     http://ptktools.sourceforge.net/#tksm
-- 

                                                        - Todd

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