How do trap and respond to a resize event for a widget in pTk?

For example, I'd like to be able to adjust the wraplength for a label as the size of the window changes. Is there an event I can bind to that will let me configure my Label as needed?

The code below demonstrates a Label widget that does not 'reflow' when the window is resized. 

use strict;
use warnings;


use Tk;

my $mw = MainWindow->new();

my $long_text = <<EOT;
Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Pellentesque
+ dictum tempor augue. Sed id pede. Suspendisse a erat a risus tincidu
+nt rhoncus. Integer eget risus. Nulla nunc odio, viverra eget, consec
+tetuer non, mollis at, felis. In hac habitasse platea dictumst. Nulla
+ accumsan volutpat eros. Vivamus convallis, eros ut convallis facilis
+is, justo ipsum convallis orci, vehicula laoreet purus eros eget ante
+. In tempor. Proin varius placerat nisl.

Class aptent taciti sociosqu ad litora torquent per conubia nostra, pe
+r inceptos hymenaeos. Aenean pretium augue ac nulla. Praesent ante ri
+sus, iaculis et, malesuada a, luctus in, orci. Sed erat odio, auctor 
+sed, molestie vel, volutpat at, elit. Phasellus fermentum ultricies e
+st. Aenean interdum elit sit amet est. Donec luctus lacus a turpis. S
+ed et risus. Fusce metus. Pellentesque lorem dolor, volutpat in, cong
+ue id, luctus et, magna. Nullam congue sagittis orci. Pellentesque ne
+c metus. Nulla nulla.

EOT

# how can I force wraplegth to adjust as the main window (or container
+ frame) is resized?
$mw->Label( 
    -text => $long_text,
    -wraplength => 250,
)->pack( 
    -fill => 'both', 
    -expand => 1,
);

MainLoop;

[download]


TGI says moo

In reply to Handling resizing in pTk by TGI

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