# Module of TWiki Enterprise Collaboration Platform, http://TWiki.org/
#
# Copyright (C) 2000-2018 Peter Thoeny, peter[at]thoeny.org
# and TWiki Contributors. All Rights Reserved. TWiki Contributors
# are listed in the AUTHORS file in the root of this distribution.
# NOTE: Please extend that file, not this notice.
#
# Additional copyrights apply to some or all of the code in this
# file as follows:
#
# This program 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
# of the License, or (at your option) any later version. For
# more details read LICENSE in the root of this distribution.
#
# This program 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.
#
# As per the GPL, removal of this notice is prohibited.

package TWiki::Configure::UIs::Root;
use base 'TWiki::Configure::UIs::Section';

use TWiki::Configure::UI;

# Visit the nodes in a tree of configuration items, and generate
# their UIs.
sub ui {
    my ($this, $tree, $valuer) = @_;
    $this->{valuer} = $valuer;
    $this->{output} = '';
    @{$this->{stack}} = ();
    $tree->visit($this);
    return $this->{output};
}

sub startVisit {
    my ($this, $item) = @_;
    push(@{$this->{stack}}, $this->{output});
    $this->{output} = '';
    return 1;
}

sub endVisit {
    my ($this, $item) = @_;
    my $class = ref($item);
    $class =~ s/.*:://;
    my $ui = TWiki::Configure::UI::loadUI($class, $item);
    die "Fatal Error - Could not load UI for $class - $@" unless $ui;
    $this->{output} =
      pop(@{$this->{stack}}).
        $ui->open_html($item, $this->{valuer}, $this->{experts}).
          $this->{output}. # only used for sections
            $ui->close_html($item, $this->{valuer}, $this->{experts});
    return 1;
}

1;