MATLAB: How to disable the call of a function

callsdisableenableflow controlfunctionguilistener

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!

Best Answer

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);

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If I understand correctly, you have a toggle button and a pushbutton. When you set the toggle button to 'on', you want the pushbutton callback to execute. Is that correct?

If that is correct, the trick is perhaps to realize that your callbacks are just functions. You can call them just like any function. The solution here is to call the pushbutton callback from within the toggle callback function (when value is 'on'). Just be sure to set the first input to be the corresponding component object instead of hObject.

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% hObject    handle to on_offbutton (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
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%assuming you are using GUIDE and the button is called pushbutton1 

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

After the code that rolls the dice finishes re-enable the button

%assuming you are using GUIDE and the button is called pushbutton1 
 set(handles.pushbutton1,'Enable','on')

Best Answer

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