I've run your code, and read your explanation, but I "think" you are misunderstanding what you can do in resizing the widgets. The mainwindow will automatically pack itself to the smallest size that will show everything. That is what you get when you first run your program. If at that point, if I try to make the y height smaller, the Exit button will disappear. If I make y bigger, no problem. The same applies to your repacking. If there is not enough room for everything, the last packed widget will be lopped off, and the packer won't automagically shrink the first packed widgets to accomodate everything. You can see this by setting the geometry a bit small, the Exit button will be lopped off. You probably can make some more room by cutting the padding on your frames from 5 to 1. 
 $goMainWindow = new MainWindow;
  $goMainWindow->geometry('200x300'); #Exit is lopped off

[download]

You have a couple of options as I see it.

1. Set a minimum size on Resizing your window. This can be done by setting no geometry at first, letting pack fill to the minimum size, grab that size and set that as a minimum. 

# at ther end of your build_gui sub

$goMainWindow->idletasks;
my $w = $goMainWindow->reqwidth;
my $h = $goMainWindow->reqheight; 
print "$w $h\n";
$goMainWindow->minsize($w,$h);

[download]
that will prevent them making the window smaller than what is required to show everything.

2. You could put your repacked stuff into a scrolled Pane. Leave the Exit button on the mainwindow. 

#!/usr/bin/perl
use strict;
use Tk;
require Tk::Pane;

our ($goMainWindow);
our (%ghGuiObjs);
our (%ghGuiCBVars);

$| = 1;
&main();

sub main {
  buildGui();
  MainLoop;
} #end sub main


sub updateA {
  if ( $ghGuiCBVars{"nEnableFrameA"} == 1 ) {
    $ghGuiObjs{"oContainerA"}->pack(
                          -expand => '1',
                          -fill => 'both',
                          -pady => '5',
    );

  } else {
    $ghGuiObjs{"oContainerA"}->packForget();
  }
}

sub updateB {
  if ( $ghGuiCBVars{"nEnableFrameB"} == 1 ) {
    $ghGuiObjs{"oContainerB"}->pack(
                          -expand => '1',
                          -fill => 'both',
                          -pady => '5',
    );
  } else {
    $ghGuiObjs{"oContainerB"}->packForget();
  }
}

sub buildGui {
  $goMainWindow = new MainWindow;
 
  my $mf =  $goMainWindow->Scrolled('Pane',
              -scrollbars => 'osoe',
               )->pack(
                      -expand => '1',
                      -fill => 'both',
                      -pady => '5',
                );


  my ($oLabel) = $mf->Label(
                      -text => "This is my example",
                      )->pack(
                      -padx => '5',
                      -pady => '5',
                      -expand => '1',
                      -fill => 'x',
                      );
  my ($oCbA) = $mf->Checkbutton(
                      -text => 'Enable A',
                      -variable => \$ghGuiCBVars{"nEnableFrameA"},
                      -command => \&updateA,
                      -anchor => 'w',
                     );
  $ghGuiCBVars{"nEnableFrameA"} = 1;
  
  my ($oFrameA) = $mf->Labelframe(
                      -labelwidget => $oCbA,
                      )->pack(
                      -padx => '5',
                      -expand => '1',
                      -fill => 'both',
                      );
  
  my ($oContainerFrameA) = $oFrameA->Frame(
                      )->pack(
                      -expand => '1',
                      -fill => 'both',
                      -pady => '5',
                      );
  $ghGuiObjs{"oContainerA"} = $oContainerFrameA;
  
  my ($oLbA) = $oContainerFrameA->Listbox(
                      -relief => 'groove',
                      -borderwidth => '5',
                      -height => '5',
                      )->pack(
                      -fill => 'both',
                      -expand => '1',
                      );


  my ($oCbB) = $mf->Checkbutton(
                      -text => 'Enable B',
                      -variable => \$ghGuiCBVars{"nEnableFrameB"},

                      -command => \&updateB,
                      -anchor => 'w',
                     );
  $ghGuiCBVars{"nEnableFrameB"} = 1;
  my ($oFrameB) = $mf->Labelframe(
                      -labelwidget => $oCbB,
                      )->pack(
                      -padx => '5',
                      -expand => '1',
                      -fill => 'both',
                      );
  my ($oContainerFrameB) = $oFrameB->Frame(
                      )->pack(
                      -expand => '1',
                      -fill => 'both',
                      -pady => '5',
                      );
  $ghGuiObjs{"oContainerB"} = $oContainerFrameB;
  my ($oLbB) = $oContainerFrameB->Listbox(
                      -relief => 'groove',
                      -borderwidth => '5',
                      -height => '5',
                      )->pack(
                      -fill => 'both',
                      -expand => '1',
                      );

  my ($oExit) = $goMainWindow->Button(-text => 'Exit',
                      -command => sub{exit},
                     )->pack(
                      -padx => '5',
                      -pady => '5',
                      -side => 'bottom',
                     );
  
}

[download]
One final word, in your original script, when you repacked, you didn't give the expand and fill options.

So, I don't know what you expect of the resizer. If you make the mainwindow smaller than what is needed to display everything, something will get lopped off..... widgets don't act like scalable fonts. If you truly wanted scalable widgets, you could make your program on a Canvas-type widget that supports group scaling.....but that is alot more work.

Of course, my view of things may be limited to what I think should be..... you can also post this on the newsgroup comp.lang.perl.tk and see what others may come up with. Maybe pack isn't the best manager for this? I don't dabble much in other geometry managers.

I'm not really a human, but I play one on earth Remember How Lucky You Are

In reply to Re^7: perltk autoresize following users resize by zentara
in thread perltk autoresize following users resize by rpelak

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