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## Copyright (C) 2008-2013 David Bateman
##
## 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{hlink} =} linkprop (@var{h}, @var{prop})
## @deftypefnx {Function File} {@var{hlink} =} linkprop (@var{h}, @{@var{prop1}, @var{prop2}, @dots{}@})
## Link graphics object properties, such that a change in one is
## propagated to the others.
##
## @var{prop} can be a string for a single property, or a cell array of strings
## for multiple properties. @var{h} is an array of graphics handles which
## will have their properties linked.
##
## An example of the use of @code{linkprop} is
##
## @example
## @group
## x = 0:0.1:10;
## subplot (1,2,1);
## h1 = plot (x, sin (x));
## subplot (1,2,2);
## h2 = plot (x, cos (x));
## hlink = linkprop ([h1, h2], @{"color","linestyle"@});
## set (h1, "color", "green");
## set (h2, "linestyle", "--");
## @end group
## @end example
##
## @end deftypefn
function hlink = linkprop (h, prop)
if (ischar (prop))
prop = {prop};
elseif (!iscellstr (prop))
error ("linkprop: properties must be a string or cell string array");
endif
for i = 1 : numel (h)
for j = 1 : numel (prop)
addlistener (h(i), prop{j}, {@update_prop, h, prop{j}});
endfor
endfor
## This should be an object that when destroyed removes the links
## The below is not quite right. As when you call "clear hlink" the
## hggroup continues to exist.
hlink = hggroup ();
set (hlink, "deletefcn", {@delete_prop, h, prop});
endfunction
function update_prop (h, d, hlist, prop)
persistent recursion = false;
## Don't allow recursion
if (! recursion)
unwind_protect
recursion = true;
val = get (h, prop);
for hh = hlist(:)'
if (hh != h)
oldval = get (hh, prop);
if (! isequal (val, oldval))
set (hh, prop, val);
endif
endif
endfor
unwind_protect_cleanup
recursion = false;
end_unwind_protect
endif
endfunction
function delete_prop (h, d, hlist, prop)
## FIXME. Actually need to delete the linked properties.
## However, only warn if the graphics objects aren't being deleted.
warn = false;
for h = hlist(:)'
if (ishandle (h) && !strcmpi (get (h, "beingdeleted"), "on"))
warn = true;
break;
endif
endfor
if (warn)
warning ("linkprop: can not remove linked properties");
endif
endfunction
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