How can I disable the call of a function?

I have defined this function in the OpeningFcn:

        set(areas(i),'ButtonDownFcn',@ImageClickCallback);

So it's time the user click in one of those areas Matlab automatically call the function, but now I just want to execute the function sometimes, so How can I disable the listener? (I would like to disable the listener instead of writing inside something like

     if control==0
          ....
     else
         ....
     end
)

thank you!

Answer 1

[Geoff Hayes]

Óscar - if you want to disable the callback then you should just "remove" it, and then "add" it back when it is required. Given the name of your call back, it seems that areas(i) could be a handle to a graphics object (image). This handle, and all that which is in areas could be saved to the handles structure in the OpeningFcn as

 handles.areas = areas;
 guidata(hObject,handles);

Then in whatever callback that fires to decide that the ImageClickCallback should be removed from areas(i), you would do something like

 % disable the callback
 set(handles.areas(i), 'ButtonDownFcn',[]);

To re-enable this callback, you would then just do the following (in whichever callback that fires to decide that ImageClickCallback is needed)

 % enable the callback
 set(handles.areas(i), 'ButtonDownFcn', @ImageClickCallback);

[Óscar]

Thank you very much Geoff, and then if I want to disable the callback of UIcontrol, such a Button, What shall I do?

Thanks beforehand.

[Geoff Hayes]

Óscar - you could probably do the same for a button callback, but why not just disable the button itself so that the user can't press it? To disable the button do

 set(handles.pushbutton1,'Enable','off');

and to re-enable the button do

 set(handles.pushbutton1,'Enable','on');

[Óscar]

Hey Geoff, because I sometimes call the buttons using its handle. So I would like to disable that handle momentarily, and if one of my functions calls it, then nothing has to happen(no error either).

Thanks