Re: pTk Scrolled Text problem

"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
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