Hello

I am trying to write a Tk widget wich will extend functionality of all widgets based on TK::Text. Inheritance should be determined dynamically like in Tk::Scrolled.

Lets say my class name is TextConfig and I want to inject ability to add live links into different widgets. So we can write

$text = $mw->TextConfig('Text');       # or
$text = $mw->TextConfig('SuperText');  # or
$text = $mw->TextConfig('ROText');
# etc
[download]

and receive appropriate widget with extended functionality.

Code of Tk/TextConfig.pm

package Tk::TextConfig;
use strict;

use Tk;
our @ISA;
use base qw(Tk::Derived);

Construct Tk::Widget 'TextConfig';

sub new {
  my $package = shift;
  my $parent  = shift;
  my $kind = shift;

  my $targetclass = "Tk::$kind";
  eval "require $targetclass";
  push @ISA, $targetclass;
  my $object = $targetclass->new($parent, @_);
  bless $object, "Tk::TextConfig";   # reblessing ?

  return $object;
}

my $LinkTagPrefix = 'Link_';

sub insertLink {
  my ($self, $index, $chars, $action) = @_;

  my $cnt = ++$self->{'TCcounters'}{'link'};
  my $uniquename = $LinkTagPrefix.$cnt;

  $self->insert($index, $chars, $uniquename);
  $self->tagConfigure($uniquename, qw/-foreground blue  -underline 1  
+-data/, $action);
  # ......
  $self->tagBind($uniquename, '<KeyPress>', 'keyLink');  # Wrong
  # This kind of binding has strange behaviour (bug?)
  # It is related to the 'current' mark instead of the 'insert'.
  # So it depends on mouse position
  # Anyway, it seems that Tk::Text tag bindings has noting common with
+ widget's bindings
  # Actually we cannot do Tk->break from sub keyLink
}
[download]

Code of test.pl

use strict;
use Tk;
use Tk::TextConfig;

my $mw = MainWindow->new;
my $text = $mw->TextConfig(qw/Text -height 30/)->pack(qw/-expand 1 -fi
+ll both/);
for my $i (1..200) {
  $text->insertLink('end', 'Linktext', 'Some data');
  $text->insert('end', ". \n -");
}

foreach my $tag ($text->bindtags) {
  print "  bindtag tag '$tag' has these bindings:\n";
  print "    ", $text->bind($tag), "\n";
}

MainLoop();
[download]

It looks working. But there is problems with bindtags.

  bindtag tag 'Tk::Text' has these bindings:
  <List of Tk::Text bindings>
  

Tk::Text instead of Tk::TextConfig. Manipulations with bindtags() will lead to more problems.

So questions is:
1) How to solve problem with bindtags? (I would like to redefine some bindings.)
2) Is it correct at all? How to implement dynamic inheritance for Tk widgets?

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