I have been struggling for the last couple of hours to get the column width working.
I implemented a soft autosizing function that works sufficiently.
What does not work, however, is when I have finished all my grids and just want to adapt the main window to cover all the TableMatrices (I have several, but the problem goes already for a single one). My legacy solution to this is to call reqwidth and then update the main window's geometry accordingly, to a certain limit. Geometry handlers should handle the rest.
But it seems that the reqwidth reported is not the actual widths after calling ->colWidth. I guess it is some pixel/character issue.

Appended some not working code for autosizing at the end of the above example:
Strangely enough, the reqwidth is updated (637 without->827 with colWidth), but not to the value required to show the whole TableMatrix.

use strict; # https://perlmonks.org/?node_id=11140544
use warnings;
use Tk;
use Tk::TableMatrix;

my ($nrows, $ncolumns) = (10, 10);

my $mw = MainWindow->new();
$mw->configure(-title=> "TableMatrix Demo");
$mw->geometry("600x800+0+0"); 

my $buttonbar = $mw->Frame(-bg => 'blue',
  )->pack(-fill => 'x');
$buttonbar->Button(-text => 'Exit', -command => sub{$mw->destroy},
  )->pack(-side => 'right', -fill => 'x', -expand => 1);
$buttonbar->Button(-text => 'Set Size', -command => sub{},
  )->pack(-side => 'right', -fill => 'x', -expand => 1);
$buttonbar->Button(-text => 'Remove Column',
  -command => sub{},
  )->pack(-side => 'right', -fill => 'x', -expand => 1);

my %MainHash;
my $tMain=\%MainHash; #main data structure for the TableMatrix

my $table_frame = $mw->Frame(-height=>'10',-width=>'10',
                       -relief=>'groove',-borderwidth=>'3'
                       )->pack(-expand=>1, -fill=>'both',-pady=>'0');
                       
my @col_heads = map{"Col Head $_"}0..$ncolumns;                       
                       

###
### Main TableMatrix object
###
my $table = $table_frame->Scrolled('TableMatrix',
  -cols => 10,
  -rows =>10,   #fixed number of rows!!! need to grow this dynamically
+!
                  #I forget how I did this, but it is possible
# -width => 5,  #minimum width in columns to be shown
# -height => 10, #minimum number of rows to be shown - seems to limit!
+! not Min!??
 -titlerows => 1,
 -variable => $tMain,
 -selectmode => 'single',
# -state => 'disabled',   # no direct editing of cells
 -resizeborders => 'col', 
 -bg => 'white',
 -rowheight => 1,  #make row display more compact....
 -bd => [0,1,0,1],
 -justify => 'left',
 -drawmode => 'compatible',
 -wrap => 1,
 -relief => 'solid',
 -scrollbars=>'se',
 -exportselection =>1,
)->pack(-expand =>1, -fill=>'both');

foreach my $row (0..$nrows-1)
{
    foreach my $col (0..$ncolumns-1)
    {
        $tMain->{"$row,$col"} = "row $row col $col"; 
    }
}

set_col_width($table,@col_heads); #THIS WILL CAUSE A SCREEN REFRESH!

sub set_col_width{
   (my $table, my @col_head) = @_;
 
   my $i=0;
   foreach my $col (@col_head){ 
     $table->colWidth($i++, length($col)+4);
   }
}

$mw->update;
$table->update;
$table_frame->update; #Needed
my $rw = $table_frame->reqwidth;
print "RW:".$rw."\n";
$mw->geometry($rw."x800+0+0"); 


MainLoop;

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In reply to Re^4: Tk performance and "UpdateWrapper: Failed to create container" by olgo
in thread Tk performance and "UpdateWrapper: Failed to create container" by olgo

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