gui buttongroup

Hello All,

My question is regarding the callback function of a button group. MATLAB states that one can write such a function and whenever a button is selected in the button group, this function is automatically executed. My 'selbck' function is working properly but.... when I set the value of a particular button in the button group to '1' using command line, the callback is not called.

is there a way of doing so ?

For example

1. The button group callback is 'selbckevent'

2. I have an event list: 'imaged', 'uncaged', with handles 'imageh', 'uncageh'

3. If I press the buttons, selbckevent is excecuted, if I write 'set(imageh, 'Value', 1)' it is NOT executed

please help

rishabh

Answer 1

[Walter Roberson]

There might be a way involving property listeners, but it is typical and usually desirable that callbacks not automatically be invoked when properties are set().

You can manually invoke the callback:

cb = get(imageh,'Callback');
if ~isempty(cb)
  if ischar(cb)
    feval(cb, imageh, struct());
  elseif isa(cb, 'function_handle')
    cb(imageh, struct());
  elseif iscell(cb)
    cb{1}(imagesh, struct(), cb{2:end});
  else
    error(['imageh callback has unexpected properties, class ', ...
           class(cb)]);
  end
end

The code can be shortened a lot if you make assumptions about what the callback will be coded as.

You may have noticed that I passed struct() as the event data. Some callbacks have non-empty event data needed in order to work properly. When you are changing the value of a property via set(), you are not doing so in reaction to an event that you can get the necessary values from. Your callback would need to be coded to handle this situation, or you would need to pass in fake event information.

(You see now why the callback is not invoked automatically when you set() ?)

[Rishabh Kasliwal]

I am digesting your answer.

I'll try it

thanks

[Rishabh Kasliwal]

Digested. It is working :)