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########################################################################
##
## Copyright (C) 2012-2024 The Octave Project Developers
##
## See the file COPYRIGHT.md in the top-level directory of this
## distribution or <https://octave.org/copyright/>.
##
## 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/>.
##
########################################################################
## -*- texinfo -*-
## @deftypefn {} {@var{hdata} =} guihandles (@var{h})
## @deftypefnx {} {@var{hdata} =} guihandles
## Return a structure of object handles for the figure associated with
## handle @var{h}.
##
## If no handle is specified the current figure returned by @code{gcf} is used.
##
## The fieldname for each entry of @var{hdata} is taken from the @qcode{"tag"}
## property of the graphic object. If the tag is empty then the handle is not
## returned. If there are multiple graphic objects with the same tag then
## the entry in @var{hdata} will be a vector of handles. @code{guihandles}
## includes all possible handles, including those for
## which @qcode{"HandleVisibility"} is @qcode{"off"}.
## @seealso{guidata, findobj, findall, allchild}
## @end deftypefn
function hdata = guihandles (h)
if (nargin == 1)
if (! ishghandle (h))
error ("guidata: H must be a valid object handle");
endif
h = ancestor (h, "figure");
if (isempty (h))
error ("guidata: no ancestor figure of H found");
endif
else
h = gcf ();
endif
hdata = __make_guihandles_struct__ (h, []);
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 hkid = kids'
hdata = __make_guihandles_struct__ (hkid, hdata);
endfor
endfunction
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