Tk create menu item dynamically

IB2017 has asked for the wisdom of the Perl Monks concerning the following question:

How can I create items of a Tk pop-up menu conditionally, for example with a switch 0/1 for the first command? (Possibly still using the same way to construct the -menuitems array (since I ve got increadibly many of such menus). This is how I construct my menu:

$menu = $mw->Menu(-tearoff=>0, -menuitems=>[
    [command=>$MESS_0= -command=>[\&DialogMove, $obj,]],
    '',
    [command=>$MESS_1, -command=>[sub {MoveColumn('right')}, $obj,]],
    [command=>$MESS_2, -command=>[sub {MoveColumn('left')}, $obj,]],
    '',
    [command=>$MESS_3, -command=>[sub {HideColumn()}, $obj,]],
    [command=>$MESS_4, -command=>[sub {
        if ($ContentColumn11GLOBAL eq 11){$ContentColumn11GLOBAL=0}
        else {$ContentColumn11GLOBAL=11}
        SetViewFromSearchFrame11($ContentColumn11GLOBAL);
    }, $obj,]],
    [command=>$MESS_5, -command=>[sub {
        if ($ContentColumn12GLOBAL eq 12){$ContentColumn12GLOBAL=0}
        else {$ContentColumn12GLOBAL=12}
        SetViewFromSearchFrame12($ContentColumn12GLOBAL);
    }, $obj,]],
]); 
$menu->configure(-postcommand => sub {
   redefine_labels();
   $menu->entryconfigure(2, -label => $MESS_1);
   $menu->entryconfigure(3, -label => $MESS_2);
   $menu->entryconfigure(5, -label => $MESS_3);
   $menu->entryconfigure(6, -label => $MESS_4);
   $menu->entryconfigure(7, -label => $MESS_5);
});
[download]

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Re: Tk create menu item dynamically by kcott (Archbishop) on Mar 14, 2020 at 03:54 UTC
G'day IB2017, Referring to the title of your post, the following code dynamically creates menu items. `#!/usr/bin/env perl use strict; use warnings; use Tk; my $mw = MainWindow::->new(); my $mb = $mw->Menubutton(-text => 'Popup'); my $menu = $mb->menu(); $mb->configure(-menu => $menu); $mb->pack(); $mw->Button( -text => 'Add menu item', -command => sub { $mb->command(-label => 'A', -command => sub { 1 }) }, )->pack(); MainLoop;` [download] This code is fully functional. If you run it and click "Popup", you'll see a menu with no items. Now click "Add menu item" then "Popup" again: you'll see the menu now has one item. You can repeat this process and see the number of menu items growing. You can tearoff the menu and watch it grow dynamically every time you click "Add menu item". As already pointed out, we can't run the code you posted. It is incomplete and it is not possible to tell you how modify it to do what you ask. Here's a few suggestions: `$MESS_0` to `$MESS_5` does not look good. Consider an array (`@MESS`) and code `$MESS[0]` to `$MESS[5]`. In a similar vein to the `$MESS_n` variables, subroutine calls of the form `SetViewFromSearchFrame11($arg)` and `SetViewFromSearchFrame12($arg)` don't look good either. The names suggest they have shared functionality: consider abstracting that functionality such that calls have the form `SetViewFromSearchFrame($n, $arg)`. Look at perlop. Learn the difference between string and numerical relational and equality operators. Run `widget` and use the "See Code" buttons. There are sections for all different types of widgets; that includes a "Menus" section. See the Tk page. That has links to documentation about menus (and all other widgets). — Ken	[reply] [d/l] [select]
Re: Tk create menu item dynamically by Anonymous Monk on Mar 14, 2020 at 00:54 UTC
This is how I construct my menu: Hi, Well, that is not runnable -- you should make that runnable and post an update How can I create items of a Tk pop-up menu conditionally, for example with a switch 0/1 for the first command? (Possibly still using the same way to construct the -menuitems array (since I ve got increadibly many of such menus). The best advice I have for you at the moment is make your sample runnable as a step 1	[reply]