## Copyright (C) 2018-2019 Rik Wehbring
##
## This file is part of Octave.
##
## Octave 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.
##
## Octave 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 Octave; see the file COPYING.  If not, see
## <https://www.gnu.org/licenses/>.

%!function cb_children (hg)
%!  hl = get (hg, "children");
%!  color = get (hl, "color");
%!  set (hl, "userdata", isequal (color, [1 0 0]));
%!endfunction

%!test
%! hf = figure ("visible", "off");
%! unwind_protect
%!   hax = axes ("parent", hf);
%!   hg = hggroup ();
%!   addlistener (hg, "children", @cb_children);
%!   hl = line ([0, 1], [1, 1], "color", "r", "parent", hg);
%!   assert (get (hl, "userdata"), true);
%! unwind_protect_cleanup
%!   close (hf);
%! end_unwind_protect
