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Re^2: Writing my first PERL/Tk megawidgit

by Anonymous Monk
on Jun 30, 2020 at 23:30 UTC ( #11118744=note: print w/replies, xml ) Need Help??


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

FIRST: here is the perl code/widget that I made which works:

#! /usr/pkg/bin/perl use warnings; # use diagnostics; use Tk; use Tk::Entry; unshift (@INC , "/usr/pkg/lib/perl5/site_perl/5.30.0/x86_64-netbsd +-thread-multi/Tk"); unshift (@INC , "/usr/pkg/lib/perl5/vendor_perl/5.30.0/Cache/Memca +ched"); unshift (@INC , "/usr/pkg/lib/perl5/site_perl/5.30.0/Cache"); $mw = MainWindow -> new(); $mw -> title ("Listbox"); @choices = qw /alpha beta charlie delta echo foxtrot hotel india juli +et kilo lima motel nancy oscar papa quebec radio sierra tango uniform + victor whiskey xray yankee zulu oin gloin beorn gandalf elrond eowyn +/; $header_msg = "ENTER a KEY name: "; my ($search , $oldsearch); ##-------------------------------------------------------------------- +------------## &listbox1 (@choices , $header_msg ); ##WORKS!! Make sure the $msg is + last element ##-------------------------------------------------------------------- +------------## MainLoop; sub listbox1 { my(@choices , $header_msg ); $header_msg = pop (@_) ; @choices = @_ ; my $dialog = $mw -> Label (-text => $header_msg ) -> pack( -side = +> "top" ); $dialog = $mw -> Entry (-textvariable => \$search, + ) -> pack ( -side => "top" , -fill => "x" ); $dialog -> bind ( "<KeyPress>" , [\&do_search , Ev ("K" )] ); # $mw = $dialog -> Show(); #HMMMMMM... WORKED; so Show() is unnee +ded? ############## $lb = $mw -> Scrolled ("Listbox" , -scrollbars => "se" , -height => 20 , -selectforeground => 'orange' +, -selectbackground => 'steelbl +ue4' , ) -> pack(-side => "top") ; $lb -> insert ( "end" , sort @choices ); ### MAKE '@choices' the list of $keys my $f = $mw -> Frame( ) -> pack(-side => 'bottom' , -fill => "x" + ) ; $f -> Button ( -text => "QUIT" , -background => 'red', # -relief => 'sunken' -command => sub { ( $mw -> destroy() ) if Tk::E +xists( $mw ); } ) -> pack (-side => 'bottom' , -fill => "x" ); $lb -> bind( '<Double-1>' , \&get_choice ); } ## CLOSE listbox1() ################## sub get_choice { my $mychoice = $lb -> get( 'active'); print "\$mychoice = : $mychoice\n\n "; } sub do_search { my ($entry , $key) = @_; return if ( $key =~ /backspace/ ); return if ( $oldsearch eq $search ); my @list = $lb -> get(0 , "end"); foreach ( 0 .. $#list ) { if ($list [$_] =~ /^$search/ ) { $lb -> see($_); $lb -> selectionClear( 0 , "end" ); $lb -> selectionSet ($_); last; } } $oldsearch = $search; } ## CLOSE do_search()

WHAT I like about it is it sticks the vars in a listbox with a slider. It also searches. Type in the first letter(s) and it takes you to the matching string. I can see uses elsewhere for such a thing. In this case it is for choosing hash-keys so I can delete Cache::Cache entries/elements
I am curious: Why isnt there a megawidget repository somewhere?

Replies are listed 'Best First'.
Re^3: Writing my first PERL/Tk megawidgit
by tybalt89 (Prior) on Jul 01, 2020 at 16:25 UTC
    #!/usr/bin/perl use strict; # https://perlmonks.org/?node_id=11118320 use warnings; use Tk; { # for 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 ClassInit # called once to initialize new class { my($class, $mw) = @_; $class->SUPER::ClassInit($mw); } sub Populate # called to build each widget instance { my($self, $args) = @_; $self->SUPER::Populate($args); my $search = ''; 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); my $entry = $frame->Entry(-textvariable => \$search, -validate => 'key', -validatecommand => sub { my ($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 ); } } # 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 $mw = MainWindow->new; $mw->geometry( '+900+250' ); $mw->title( 'Listbox' ); my $lb = $mw->ListBox3( -text => $header_msg, )->pack(-fill => 'both', -expand => 1, -side => 'left'); $lb->insert( 'end', @choices ); my $lb2 = $mw->ListBox3( -text => $header_msg, )->pack(-fill => 'both', -expand => 1, -side => 'left'); $lb2->insert( 'end', @choices ); MainLoop;

    Demos two of them to show no interference.

      Hey -- thanks. The stuff after " } # end package " made a lot of sense to me, since it is straight pTk code. You forgot the button on the bottom. BUT at this point I understand the code enough to do it myself. Whats the best way to deal with the "sub ClassInit" and "sub Populate" magic?

Re^3: Writing my first PERL/Tk megawidgit
by Anonymous Monk on Jul 03, 2020 at 14:36 UTC

    I have the MEGAWIDGET displayed in my program. It is floating in the middle of a large text window -- called with 'DialogBox' and 'Show' . How do I get the data out of the Listbox (which is inside the MEGAWIDGET), so I can operate on it? This is my program-code -- as far as I have got:

    my $header_msg = "Get what fr +om MemCache?" ; ******** BEGIN DialogBox ******** my $dialog = $top -> DialogBo +x ( + -title => ' ', + -buttons => [] + ); my $lb = $dialog -> ListBox3( + -text => $header_msg, ) + -> pack(-side => 'top' ); + $lb -> insert( 'end' , + @cache_list ); $dialog -> Button ( -t +ext => "Abort" , -b +g => 'red' , -c +ommand => sub { ( $dialog -> destroy() ) if Tk::Exists( $dialog ) ; } )-> +pack ( -side => 'bottom' , -fill => 'x' ); $lb -> bind ( '<Doubl +e-3>' , sub { + my $mychoice = $lb -> get( 'active'); + print "\$mychoice = : $mychoice\n\n "; + } ); ******** SHOW 'DialogBox ******** $top = $dialog -> Show +(); + # $lb -> bind('<Double- +3>' , \&get_choice); $lb -> bind ( '<Doubl +e-3>' , sub {
      #!/usr/bin/perl use strict; # https://perlmonks.org/?node_id=11118320 use warnings; use Tk; { # start package package Tk::ListBox3; use List::Util qw( first ); use base qw/ Tk::Frame /; # Frame-based composite Construct Tk::Widget 'ListBox3'; # install MyNewWidget in pTk namespac +e sub Populate # called to build each widget instance { my($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 +); } } # 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('active'); $mw->destroy }, )->pack(-fill => 'x'); MainLoop; defined $selection and print "'$selection' was selected\n";

        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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