--- /dev/null
+## Copyright (C) 2012 Michael Goffioul
+##
+## 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
+## <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {@var{hdata} =} guihandles (@var{handle})
+## @deftypefnx {Function File} {@var{hdata} =} guihandles
+## @end deftypefn
+
+## Author: goffioul
+
+function hdata = guihandles (varargin)
+
+ hdata = [];
+
+ if (nargin == 0 || nargin == 1)
+ if (nargin == 1)
+ h = varargin{1};
+ if (ishandle (h))
+ h = ancestor (h, "figure");
+ if (isempty (h))
+ error ("no ancestor figure found");
+ endif
+ else
+ error ("invalid object handle");
+ endif
+ else
+ h = gcf ();
+ endif
+ hdata = __make_guihandles_struct__ (h, hdata);
+ else
+ print_usage ();
+ endif
+
+endfunction
+
+function hdata = __make_guihandles_struct__ (h, hdata)
+
+ tag = get (h, "tag");
+ if (! isempty (tag))
+ if (isfield (hdata, tag))
+ hdata.(tag) = [hdata.(tag), h];
+ else
+ try
+ hdata.(tag) = h;
+ catch
+ end_try_catch
+ endif
+ endif
+
+ kids = allchild (h);
+ for i = 1 : length (kids)
+ hdata = __make_guihandles_struct__ (kids(i), hdata);
+ endfor
+
+endfunction