[Octave-bug-tracker] [bug #44242] Adding a listener to the "children" property has no effect

[Ben Abbott]

Follow-up Comment #7, bug #44242 (project octave):

I'm not exactly trustworthy when it comes to reading c++, but it looks to me
as if the listeners are not called when the children are modified from the c++
side, which is what happens when a new object is added to a parent.

To check I tried the modified script below.


1;
function my_handler (h, dummy)
  fprintf ("my_handler called\n");
endfunction
figure (1)
clf ()
hax = axes ();
plot (rand (3))
hold all
fcn = @my_handler;
prop = "children";
addlistener (hax, prop, fcn)
plot (rand (3))
h = get (gca (), prop);
set (gca (), prop, flipud (h))


Running this script does trigger the listener.

Is it possible that listeners are only triggered when the associated property
is modified from an m-file, or command line?

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