# Copyright 2009, 2010 Kevin Ryde
# This file is part of Chart.
#
# Chart is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 3, or (at your option) any later
# version.
#
# Chart is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
# for more details.
#
# You should have received a copy of the GNU General Public License along
# with Chart. If not, see <http://www.gnu.org/licenses/>.
package App::Chart::Gtk2::Ex::RadioGroup;
use 5.008;
use strict;
use warnings;
use Gtk2;
use Scalar::Util;
use Glib::Ex::SignalIds;
use Glib::Object::Subclass
'Glib::Object',
signals => { changed => { param_types => [],
return_type => undef },
},
properties => [ Glib::ParamSpec->scalar
('members',
'members',
'Arrayref of Gtk2::Widget members of the group.',
Glib::G_PARAM_READWRITE),
];
sub INIT_INSTANCE {
my ($self) = @_;
$self->{'members'} = [];
}
sub GET_PROPERTY {
my ($self, $pspec) = @_;
# my $pname = $pspec->get_name;
my $members = $self->{'members'};
@$members = grep {defined} @$members;
return $members;
}
sub SET_PROPERTY {
my ($self, $pspec, $newval) = @_;
# my $pname = $pspec->get_name;
$self->clear;
$self->add (@$newval);
}
sub _purge {
my ($self) = @_;
my $members = $self->{'members'};
@$members = grep {defined $_ && $_->get_group} @$members;
}
sub clear {
my ($self) = @_;
my $members = $self->{'members'};
if (@$members) {
require Glib::Ex::FreezeNotify;
my $freezer = Glib::Ex::FreezeNotify->new ($self);
foreach my $object (@$members) {
if ($object) {
$self->remove ($object);
}
}
}
}
sub remove {
my ($self, $object) = @_;
$object->set (group => undef);
delete $object->{__PACKAGE__.'.ids'};
my $members = $self->{'members'};
@$members = grep {defined && $_ != $object} @$members;
$self->notify ('members');
}
sub add {
my $self = shift;
my $members = $self->{'members'};
Scalar::Util::weaken (my $weak_self = $self);
while (@_) {
my $object = shift;
$object->set (group => $self->representative);
$object->{__PACKAGE__.'.ids'} = Glib::Ex::SignalIds->new
($object,
$object->signal_connect ('notify::group',
\&_do_group_changed, \$weak_self));
push @$members, $object;
Scalar::Util::weaken ($members->[-1]);
}
$self->notify ('members');
}
sub _do_group_changed {
my ($object, $pspec, $ref_weak_self) = @_;
my $self = $$ref_weak_self || return;
$self->remove ($object);
}
sub members {
my ($self) = @_;
_purge($self);
return @{$self->{'members'}};
}
sub representative {
my ($self) = @_;
_purge($self);
return $self->{'members'}->[0];
}
sub active_item {
my ($self) = @_;
return List::Util::first {$_->get('active') && $_->get_group} $self->members;
}
1;
__END__