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package Tk::Menu::Item;
require Tk::Menu;
use Carp;
use strict;
use vars qw($VERSION);
$VERSION = '4.004'; # $Id: //depot/Tkutf8/Tk/Menu/Item.pm#4 $
sub PreInit
{
# Dummy (virtual) method
my ($class,$menu,$minfo) = @_;
}
sub new
{
my ($class,$menu,%minfo) = @_;
my $kind = $class->kind;
my $name = $minfo{'-label'};
if (defined $kind)
{
my $invoke = delete $minfo{'-invoke'};
if (defined $name)
{
# Use ~ in name/label to set -underline
if (defined($minfo{-label}) && !defined($minfo{-underline}))
{
my $cleanlabel = $minfo{-label};
my $underline = ($cleanlabel =~ s/^(.*)~/$1/) ? length($1): undef;
if (defined($underline) && ($underline >= 0))
{
$minfo{-underline} = $underline;
$name = $cleanlabel if ($minfo{-label} eq $name);
$minfo{-label} = $cleanlabel;
}
}
}
else
{
$name = $minfo{'-bitmap'} || $minfo{'-image'};
croak('No -label') unless defined($name);
$minfo{'-label'} = $name;
}
$class->PreInit($menu,\%minfo);
$menu->add($kind,%minfo);
$menu->invoke('last') if ($invoke);
}
else
{
$menu->add('separator');
}
return bless [$menu,$name],$class;
}
sub configure
{
my $obj = shift;
my ($menu,$name) = @$obj;
my %args = @_;
$obj->[1] = $args{'-label'} if exists $args{'-label'};
$menu->entryconfigure($name,@_);
}
sub cget
{
my $obj = shift;
my ($menu,$name) = @$obj;
$menu->entrycget($name,@_);
}
sub parentMenu
{
my $obj = shift;
return $obj->[0];
}
# Default "kind" is a command
sub kind { return 'command' }
# Now the derived packages
package Tk::Menu::Separator;
use base qw(Tk::Menu::Item);
Construct Tk::Menu 'Separator';
sub kind { return undef }
package Tk::Menu::Button;
use base qw(Tk::Menu::Item);
Construct Tk::Menu 'Button';
Construct Tk::Menu 'Command';
#package Tk::Menu::Command;
#use base qw(Tk::Menu::Button);
#Construct Tk::Menu 'Command';
package Tk::Menu::Cascade;
use base qw(Tk::Menu::Item);
Construct Tk::Menu 'Cascade';
sub kind { return 'cascade' }
use Carp;
sub PreInit
{
my ($class,$menu,$minfo) = @_;
my $tearoff = delete $minfo->{-tearoff};
my $items = delete $minfo->{-menuitems};
my $widgetvar = delete $minfo->{-menuvar};
my $command = delete $minfo->{-postcommand};
my $name = delete $minfo->{'Name'};
$name = $minfo->{'-label'} unless defined $name;
my @args = ();
push(@args, '-tearoff' => $tearoff) if (defined $tearoff);
push(@args, '-menuitems' => $items) if (defined $items);
push(@args, '-postcommand' => $command) if (defined $command);
my $submenu = $minfo->{'-menu'};
unless (defined $submenu)
{
$minfo->{'-menu'} = $submenu = $menu->Menu(Name => $name, @args);
}
$$widgetvar = $submenu if (defined($widgetvar) && ref($widgetvar));
}
sub menu
{
my ($self,%args) = @_;
my $w = $self->parentMenu;
my $menu = $self->cget('-menu');
if (!defined $menu)
{
require Tk::Menu;
$w->ColorOptions(\%args);
my $name = $self->cget('-label');
warn "Had to (re-)reate menu for $name";
$menu = $w->Menu(Name => $name, %args);
$self->configure('-menu'=>$menu);
}
else
{
$menu->configure(%args) if %args;
}
return $menu;
}
# Some convenience methods
sub separator { shift->menu->Separator(@_); }
sub command { shift->menu->Command(@_); }
sub cascade { shift->menu->Cascade(@_); }
sub checkbutton { shift->menu->Checkbutton(@_); }
sub radiobutton { shift->menu->Radiobutton(@_); }
sub pack
{
my $w = shift;
if ($^W)
{
require Carp;
Carp::carp("Cannot 'pack' $w - done automatically")
}
}
package Tk::Menu::Checkbutton;
use base qw(Tk::Menu::Item);
Construct Tk::Menu 'Checkbutton';
sub kind { return 'checkbutton' }
package Tk::Menu::Radiobutton;
use base qw(Tk::Menu::Item);
Construct Tk::Menu 'Radiobutton';
sub kind { return 'radiobutton' }
package Tk::Menu::Item;
1;
__END__
=cut
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