MATLAB: How to change the Gui close function whithout changing the close function of figures

close functiongui

Hi, I'm trying to protect the close request function of my GUI with a yes/no question etc.
I've found some common way to do this in the matlab help :
set(0,'DefaultFigureCloseRequestFcn',@my_closereq).
This works but also changes the close function of the external figures and I don't want to.
I tried: set(hObject,'DefaultFigureCloseRequestFcn',@my_closereq)
But this gives the same problem.
Any Idea ?

Best Answer

Mathieu - my understanding of the DefaultFigureCloseRequestFcn is that once set at the root level (0), then MATLAB uses this setting for the CloseRequestFcn of all subsequently created figures.
I think what you want to do instead is just modify the CloseRequestFcn for your GUI figure. If you are using GUIDE, then you should click the figure and select (from the menu) View --> View Callbacks --> CloseRequestFcn and the following should appear in the editor
 % --- Executes when user attempts to close YourGuiName.
function YourGuiName_CloseRequestFcn(hObject, eventdata, handles)
% hObject    handle to YourGuiName (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% Hint: delete(hObject) closes the figure delete(hObject);
You could then change the body to something like
 selection = questdlg('Close YourGuiName?',...
                     'Close Request Function',...
                     'Yes','No','Yes');
 switch selection,
   case 'Yes',
     delete(hObject);
   case 'No'
     return
 end
To do something more similar to the code you have written in your question, you could do
 set(figure_handle,'CloseRequestFcn','my_closereq')
where figure_handle is the handle to your figure. Note how we use CloseRequestFcn (just like the GUIDE approach) which will affect figure_handle only and not be the default behaviour for all other figures.
Try the above and see what happens!
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