Tk:::Optionmenu startup displaying the optionlist

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

Is there a method to have Tk::Optionmenu start displaying the option list without having the user first click the button?

Question 2: Why does the Optionmenu callback function (localCall below) get called before the user click of Optionmenu button? Please look at my workaround.

Thanks

!/usr/bin/perl -w
use strict;
use warnings;
# teest Tk::Menuoption

use Tk;
use Tk::Optionmenu;

my $mw = new MainWindow;

my $baseFrame = $mw->Frame()->pack(
                -side=>'top',
                -fill=>'both',
                -expand=>0);
my $name_text = "phone name";
my $phoneNo = 51206;
$baseFrame->Button(-text=>$phoneNo,
                    -relief=>'flat',
                    -cursor=>'hand1',
                    -activeforeground=>'blue',
                    -activebackground=>'white',
                    -command => sub {phoneCmds(
                                    $baseFrame,
                                    $phoneNo);},
                    )->pack(-side=>'left');

my $cmdsFrame;
my $cm;
sub phoneCmds {
    my (
        $baseFrame,
        $caller,
    ) = @_;
    my $deviceDN = $caller;
    print "caller(deviceDN)=$deviceDN\n";
    
    $cmdsFrame = $baseFrame->Frame( )->pack(
                            -side=>'left',
                            -fill=>'both',
                            -expand=>0);
    
    my @callees = qw/46001 46002 46003 46004/;
    my $callee;
    $cm = $cmdsFrame->Optionmenu(-
        -variable =>\$callee,
        -options => [@callees],
        -command => [\&localCall, $caller],
    );
    $cm->pack();
    
}


sub localCall {
    my (
        $caller,
        $callee,
    ) = @_;
    return if !defined($callee);
    return if !defined($cm);
    
    print "localCall: caller=$caller callee = $callee\n";
    $cm->destroy() if $cm && $cm->exists();
    $cm = undef;
    $cmdsFrame->destroy() if $cmdsFrame && $cmdsFrame->exists();
#    $cmdsFrame = undef;
}



MainLoop;
[download]

Comment on Tk:::Optionmenu startup displaying the optionlist Download Code

Replies are listed 'Best First'.
Re: Tk:::Optionmenu startup displaying the optionlist ( tk optionmenu bug , event generate) by Anonymous Monk on Feb 04, 2015 at 00:45 UTC
Is there a method to have Tk::Optionmenu start displaying the option list without having the user first click the button? Yes, generate a tk event, or call the appropriate Tk::Optionmenu method directly, Tk::WidgetDump might help you figure stuff out or, use a widget other than Tk::Optionmenu, maybe a Tk::Listbox or something else, like a frame or panel of buttons that you create Question 2: Why does the Optionmenu callback function (localCall below) get called before the user click of Optionmenu button? What does the documentation say about it? https://metacpan.org/pod/Tk::Optionmenu#command I would assume because the Tk::Optionmenu calls it, because its written that way :) ... and this is probably a bug but it might be a feature; -options is loaded and a default option is selected after the -command is bound ... so the -command callback gets invoked Please look at my workaround. Yup, akward :) I don't recognize any part of the program as a workaround In each callback you can use $Tk::event and $Tk::widget ... combine with ->parent, and no need for some of those closures	[reply]
Re^2: Tk:::Optionmenu startup displaying the optionlist ( tk optionmenu bug , event generate) by Anonymous Monk on Feb 04, 2015 at 08:02 UTC
$cm->update; $cm->Post;	[reply]


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