Re: Glib::ParamSpec->enum or boxed

["muppet" <scott asofyet org>]

Jeffrey Ratcliffe wrote:
> Below is some demo code for composite widget. At the moment, it used
> Glib::ParamSpec->string for the property, but as only three values are
> possible, enum or boxed I assume would be better - but I can't see how
> to do it.
>
> Any hints?

Super easy.  Changes to your code inline below:


> Thanks
>
> Jeff
>
> #!/usr/bin/perl
>
> package Foo::PageRange;
>
> use strict;
> use warnings;
> use Gtk2;
> use Glib qw(TRUE FALSE);             # To get TRUE and FALSE

# Note: in a BEGIN block to ensure that the registration is complete
#       by the time the use Subclass goes to look for it.
BEGIN {
    Glib::Type->register_enum ('Foo::PageRange::Range',
    				qw(current selected all));
}

> use Glib::Object::Subclass
>     Gtk2::Frame::,
>     signals => {
>         changed => {},
>     },
>     properties => [

# The only real difference here is enum instead of string, and adding
# the enumeration's package name.
        Glib::ParamSpec->enum (
                'range', # name
                'Range', # nickname
                'Either current, selected, or all', #blurb
		'Foo::PageRange::Range',
                'all', # default
                [qw/readable writable/] #flags

>     ]
>     ;
>
>
> sub INIT_INSTANCE {
>  my ($self, $range) = @_;
>  $range = 'all' if (!$range);
>  $self->{range} = $range;
>  my $frame = Gtk2::Frame->new;
>  $self->add ($frame);
>   my $vbox = Gtk2::VBox -> new;
> # $vboxp -> set_border_width($border_width);
>   $frame -> add ($vbox);

# Instead of repetitive and error-prone code to manage the radio
# buttons by hand, let's play golf, using a single loop and some
# introspection to do the whole thing:

  my $radio = undef;
  foreach my $value (Glib::Type->list_values ('Foo::PageRange::Range')) {
    $radio = Gtk2::RadioButton->new ($radio, ucfirst $value->{nick});
    $radio->signal_connect (toggled => sub {
      $self->set_active ($value->{nick}) if $_[0]->get_active;
    });
    $vbox->pack_start ($radio, TRUE, TRUE, 0);
    $radio->set_active (TRUE) if $self->{range} eq $value->{nick};
  }

# The rest is unchanged.


> }
>
>
> sub get_active {
>  my ($self) = @_;
>  return $self->get ('range');
> }
>
>
> sub set_active {
>  my ($self, $range) = @_;
>  $self->{range} = $range;
>  $self->signal_emit ('changed');
> }
>
>
> package main;
>
> use strict;
> use warnings;
> use Glib qw(TRUE FALSE);             # To get TRUE and FALSE
> use Gtk2 -init;
>
> my $window = Gtk2::Window->new;
> $window->set_title ('Page Range');
> $window->signal_connect (delete_event => sub { Gtk2->main_quit; TRUE });
>
> my $vbox = Gtk2::VBox->new;
> $window->add ($vbox);
>
> my $pr = Foo::PageRange->new;
> $vbox->pack_start ($pr, TRUE, TRUE, 0);
>
> $pr->signal_connect (changed => sub {
>  warn $_[0]->get_active, "\n";
> });
>
> $window->show_all;
> Gtk2->main;
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>


-- 
muppet <scott at asofyet dot org>