No, because the superclass method does things before and after the loop. The only thing that the GUI aspect does is update a progress bar during a loop. I settled on simply having an if-then within updateprogress

sub updateprogress {
    my ($self) = @_;

    return unless $self->progressbar;
    my @frac = ($self->recordi, $self->recordcount);

    my $frac = frac(@frac);

    $self->progressbar->set_fraction($frac->num);

    $self->progressbar->set_text( sprintf '%d / %d', @frac);

    use Gtk2;
    while (Gtk2->events_pending) {
      Gtk2->main_iteration;
    }
    Gtk2::Gdk->flush;
}
[download]

sub manager {
    my ($Operation) = @_;

    my @row = $Operation->getnew;
    $Operation->log->debug( 'getnew rows:' . scalar(@row) );

    $Operation->recordi(0);
    for my $row (@row) {
        $Operation->recordi( $Operation->recordi + 1 );

        $Operation->log->debug( ' --- data --- ' . Dumper($row) );
        $Operation->data($row);
        $Operation->process;

    $Operation->updateprogress;
    }

}
[download]