File Coverage

blib/lib/UI/Various/Radio.pm

Criterion	Covered	Total	%
statement	68	68	100.0
branch	14	14	100.0
condition	9	9	100.0
subroutine	15	15	100.0
pod	3	3	100.0
total	109	109	100.0

package UI::Various::Radio;

# Author, Copyright and License: see end of file

=head1 NAME

UI::Various::Radio - general radio button widget of L

=head1 SYNOPSIS

    use UI::Various;
    my $main = UI::Various::main();
    my $variable = 0;
    $main->window(...
                  UI::Various::Radio->new(buttons => {1 => 'One',
                                                      2 => 'Two',
                                                      3 => 'Three'}),
                  ...);
    $main->mainloop();

=head1 ABSTRACT

This module defines the general radio button widget of an application using
L. The radio buttons are vertically aligned.

Note that the limitation to the vertical orientation comes from
L.

=head1 DESCRIPTION

Besides the common attributes inherited from C the
C widget knows only two additional attributes:

Note that the possible values for the variable are C<0> or C<1>, which will
be changed according Perl's standard true/false conversions.

=head2 Attributes

=over

=cut

#########################################################################

use v5.14;
use strictures;
no indirect 'fatal';
no multidimensional;
use warnings 'once';

our $VERSION = '0.22';

use UI::Various::core;
use UI::Various::widget;
BEGIN  {  require 'UI/Various/' . UI::Various::core::using() . '/Radio.pm';  }

require Exporter;
our @ISA = qw(UI::Various::widget);
our @EXPORT_OK = qw();

#########################################################################

=item buttons [rw]

an ARRAY with pairs of key values and corresponding displayed texts of the
radio buttons, e.g.:

    [ 1 => 'red', 2 => 'green', 3 => 'blue' ]

(looks like a HASH, but is technically an ARRAY as its sequence is important)

=cut

sub buttons($;$)
{
    local $_ =
	access
	('buttons',
	 sub{
	     unless (ref($_) eq 'ARRAY')
	     {
		 error('_1_attribute_must_be_a_2_reference', 'buttons', 'ARRAY');
		 return undef;
	     }
	     if (0 == @{$_})
	     {
		 error('_1_may_not_be_empty', 'buttons');
		 return undef;
	     }
	     unless (0 == @{$_} % 2)
	     {
		 error('odd_number_of_parameters_in_initialisation_list_of__1',
		       'buttons');
		 return undef;
	     }
	     my ($self) = @_;
	     my @keys = ();
	     my @values = ();
	     foreach my $i (0..$#{$_})
	     {
		 if (0 == $i % 2)
		 {   push @keys, $_->[$i];   }
		 else
		 {   push @values, $_->[$i];   }
	     }
	     my %hash = @$_;
	     $self->{_button_hash} = \%hash;
	     $self->{_button_keys} = \@keys;
	     $self->{_button_values} = \@values;
	 },
	 @_);
    _init_var(@_);
    return $_;
}

=item var [rw, recommended]

a variable reference for the radio buttons

The variable will be set to one of the key values of C>
when it is selected.  Note that if it's initial value is defined to
something not being an existing key value of that ARRAY, it will be set to
C.

=cut

sub var($;$)
{
    local $_ = access_varref('var', @_);
    _init_var(@_);
    return $_;
}

# need special initialisation function as initialisation sequence is
# undefined:
sub _init_var($;@)
{
    my ($self) = @_;
    return unless ($self->isa(__PACKAGE__)  and
		   defined $self->{buttons}  and
		   defined $self->{var}  and
		   defined ${$self->{var}});
    # direct access to avoid recursion:
    defined $self->{_button_hash}{${$self->{var}}}  or  ${$self->{var}} = undef;
}

#########################################################################
#
# internal constants and data:

use constant ALLOWED_PARAMETERS =>
    (UI::Various::widget::COMMON_PARAMETERS, qw(buttons var));
use constant DEFAULT_ATTRIBUTES => (var => dummy_varref());

#########################################################################
#########################################################################

=back

=head1 METHODS

Besides the accessors (attributes) described above and by
L and the methods
inherited from L only the
constructor is provided by the C class itself:

=cut

#########################################################################

=head2 B - constructor

see L
constructor for UI elements>

=cut

# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #

sub new($;\[@$])
{
    debug(3, __PACKAGE__, '::new');
    local $_ = construct({ DEFAULT_ATTRIBUTES },
			 '^(?:' . join('|', ALLOWED_PARAMETERS) . ')$',
			 @_);
    unless (defined $_->{buttons})
    {
	error('mandatory_parameter__1_is_missing', 'buttons');
	return undef;
    }
    return $_;
}

1;

#########################################################################
#########################################################################

=head1 SEE ALSO

L

=head1 LICENSE

Copyright (C) Thomas Dorner.

This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.  See LICENSE file for more details.

=head1 AUTHOR

Thomas Dorner Edorner (at) cpan (dot) orgE

=cut