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Re^5: Writing my first PERL/Tk megawidgit

by tybalt89 (Prior)
on Jul 04, 2020 at 13:33 UTC ( #11118912=note: print w/replies, xml ) Need Help??


in reply to Re^4: Writing my first PERL/Tk megawidgit
in thread Writing my first PERL/Tk megawidgit

Oops, active is different from curselection

#!/usr/bin/perl use strict; # https://perlmonks.org/?node_id=11118320 use warnings; use Tk; { # start package package Tk::ListBox3; use List::Util qw( first ); use base qw/ Tk::Frame /; # Frame-based composite Construct Tk::Widget 'ListBox3'; # install MyNewWidget in pTk namespac +e sub Populate # called to build each widget instance { my($self, $args) = @_; $self->SUPER::Populate($args); my $frame = $self->Frame( -borderwidth => 5, -relief => 'ridge', )->pack(-fill=> 'both', -expand=> 1); my $label = $frame->Label( -fg => 'blue', -font => 30, )->pack(-fill => 'x'); my $lbox = $frame->Scrolled(Listbox => -scrollbars => 'se', -height => 20, -selectforeground => 'orange', -selectbackground => 'steelblue4', -exportselection => 0, )->pack(-side => 'bottom', -fill => 'both', -expand=> 1); $frame->Entry( -validate => 'key', -validatecommand => sub { my ($want) = @_; length $want or return 1; my @list = $lbox->get(0 , "end"); my $item = first { $list[$_] =~ /^\Q$want\E/ } 0 .. $#list; defined $item or return 0; $lbox->selectionClear( 0 , "end" ); $lbox->selectionSet($item); $lbox->see($item); 1 # to allow }, )->pack(-fill => 'x'); $self->ConfigSpecs( DEFAULT => [$lbox], text => [$label],); $self->Delegates( Construct => $lbox, insert => $lbox, get => $lbox, curselection => $lbox ); } } # end package my @choices = sort qw /alpha beta charlie delta echo foxtrot hotel ind +ia juliet kilo lima motel nancy oscar papa quebec radio sierra tango uniform v +ictor whiskey xray yankee zulu oin gloin beorn gandalf elr ond eowyn/; my $header_msg = "ENTER a KEY name: "; my $selection; my $mw = MainWindow->new; $mw->geometry( '+900+250' ); $mw->title( 'Listbox' ); my $lb = $mw->ListBox3( -text => $header_msg, )->pack(-fill => 'both', -expand => 1,); $lb->insert( 'end', @choices ); $mw->Button(-text => 'QUIT', -bg => 'red', -command => sub { $selection = $lb->get($lb->curselection); $mw->destroy }, )->pack(-fill => 'x'); MainLoop; defined $selection and print "'$selection' was selected\n";

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Re^6: Writing my first PERL/Tk megawidgit
by Anonymous Monk on Jul 04, 2020 at 22:50 UTC

    That version made more sense. If I split the MEGAWIDGET and save it as a *pm file, and call it, it works fine. It returns the key that was chosen. When I stick it in the program I am working on, it fails... It displays the widget and data, but the line below fails to execute.

    MainLoop; defined $selection and print "'$selection' was selected\n";

    Here you print '$selection' after 'MainLoop;' In the program. all the GUI stuff is in a subroutine called 'create_ui', which is executed after 'MainLoop;'. Will this mess anything up? An idea here? Anyways, I been learning a lot during this adventure -- thanks.

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