Hi, I am currently running into a problem while creating a Perl/Tk application. The programme will potentially run for a rather long time and I'd like to have the user having some feedback that something is still happening. So a progress bar and a status line combined in a Toplevel widget seemed to be a good idea, but I often need more than one. Being lazy, I placed the widget creation, update and destroy routines into a module and access it from other modules. The reference to the Toplevel widget is returned and saved in a variable.
When using only one widget, everything is fine.
But when creating two, I am running into problems. Creating the widgets is no problem, but when I update one widget (using its unique reference), both Toplevel widgets are updated at the same time, overwriting the content of the first with the content of the second.
I am a bit confused why this happens and would really appreciate any help or guidance.

Here's the principle structure:

package Basics::progress_bar;
<stuff>
sub progress_bar {
my $tl= $mw->Toplevel();
...<stuff>...
return ($tl);
}

sub update {
my %args = @_;
...<redefine some variables>...
#$args{widget} should contain the unique reference that was returned above.
$args{widget}->update;
}
1;


And here are the widget calls from within another module:
$progress_bar_ref_a = &progress_bar(parameters);
$progress_bar_ref_b = &progress_bar(other parameters);

Updating the widget from within another module:
&update(widget => $progress_bar_ref_b,
additional parameters);

Although specifying the reference for the 2nd instance, both widgets will be updated with the new parameters.

In reply to Modifying Tk widgets via references by Eric

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