In the case where I needed this, I was attaching a submenu for suggestions while adding live spelling check to a Tk::Text widget. The code is basically a first draft of the concept as part of one of my personal "toy" projects. Here are some pieces:

my $main_text_field = $top->Text(-width => 132, height => 24,
                                 -setgrid => 1, -wrap => 'word');
my $main_text_field_spelling_menu = $main_text_field->menu->Menu(-tear
+off => 0);
$main_text_field_spelling_menu->configure
  (-postcommand => [\&post_suggestion_menu,
                    $main_text_field, $main_text_field_spelling_menu])
+;
$main_text_field->menu->insert
  ('View', cascade => -label => 'Respell...', -underline => 0,
   -menu => $main_text_field_spelling_menu);

[download]
sub post_suggestion_menu {
  my $widget = shift;
  my $menu = shift;

  my @wordpos;
  $menu->delete(0, 'end');
  # extract word boundaries where user requested menu into @wordpos
  if (exists $spelling_suggestions{$word}) {
    $menu->add(command => -label => $_,
              -command => [\&replace_word, $widget, @wordpos, $_])
      foreach @{$spelling_suggestions{$word}};
  } else {
    $menu->add(command => -label => 'No suggestions.', -state => 'disa
+bled');
  }
}

[download]

The -postcommand callback is able to edit the menu before it is displayed, although in my use, I wanted a fully dynamic menu that is rebuilt every time the user (me) asks for it. Note that the menu will be displayed (as far as I know) after -postcommand returns. If you want to prevent displaying the menu at all, you would need to replace the binding that posts the menu.

In reply to Re^3: Tk pop-up if condition is met by jcb
in thread Tk pop-up if condition is met by IB2017

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