One Answer (Re: How can I get indefinite scroll to work in a TK text widget)

[shmem]

Bad title. Bad title!

That said - It Works For Me ^TM.

use Tk;
$bottomFrame = MainWindow->new();
sub display_text {
    my $txt_summary = $bottomFrame->Scrolled( "Text",
                                     -background => 'blue',
                                     -foreground => 'white',
                                     -height     => '1',
                                     -takefocus  => '0',
                                     -width      => '40',
                                     -scrollbars => 'oe',
                                             )->pack(qw(-fill both -ex
+pand 1));
    open(FH, "cuentos.txt") || die "no Abrio nada";
    while (<FH>) {
        $txt_summary -> Insert($_);
    }
    close (FH);
    $txt_summary->see('end');
    return $txt_summary;
}
display_text();
MainLoop;
__END__

Maybe it's context? is it the missing arguments to pack()? what kind of object is $bottomFrame actually? Also, "text" ought to be "Text".

thanks to roboticus for the inspired title

[padawan_linuxero]

Hi!


my $bottomlowframe = $mw->Frame()->pack(-fill=>'x');

it just a Frame
but I think I ask the wrong question and I am sorry:(
I want that the Text widget continue to scroll the text "undefinitly" or "forever" but at a reasonable speed to be able to read it, I hope it makes more sense. you know like those things that keep showing the news on the tv but I want it in my Tk windows
Thank you

[shmem]

Ah. Makes more sense. While perl is busy executing display_text(), the GUI doesn't get updated. You need Tk::after or ::repeat for that:

use Tk;
$bottomFrame = MainWindow->new();

my $txt_summary = $bottomFrame->Scrolled( "Text",
                                     -background => 'blue',
                                     -foreground => 'white',
                                     -height     => '1',
                                     -takefocus  => '0',
                                     -width      => '40',
                                     -scrollbars => 'oe',
                                             )->pack(qw(-fill both -ex
+pand 1));

open(FH, "cuentos.txt") || die "no Abrio nada";

sub display_text {
    if(eof(FH)) {
       $bottomFrame->afterCancel($bottomFrame->{RepeatID});
       close (FH);
       $txt_summary -> Insert("\n== FIN ==",'end');
       return;
    } else {
       chomp(my $line = <FH>);
       $txt_summary -> Insert("\n$line",'end');
    }
    $txt_summary->see('end');
}
$bottomFrame->{RepeatID} = $bottomFrame->repeat(500, \&display_text);
MainLoop;
__END__

But probably you want Tk::fileevent. Note also that "Scrolled" means "attach a scrollbar to it", and not "scroll this widget".

[padawan_linuxero]

Hi
Thank you so much for your help
I have another question if I want it to continue in a infinite loop, what I need to do?
put everything in a Sub routine and use something like repeat to make it run again?
Thanks !!!