how to change the Gui close function whithout changing the close function of figures ?

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Mathieu
Mathieu on 2 Jul 2014
Commented: Geoff Hayes on 2 Jul 2014
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 ?

Accepted Answer

Geoff Hayes
Geoff Hayes on 2 Jul 2014
Edited: Geoff Hayes on 2 Jul 2014
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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More Answers (1)

Joseph Cheng
Joseph Cheng on 2 Jul 2014
I agree with Geoff Hayes and that should work. I did a quick example. I first created a function called closeRequest.m which contains the following.
function closeRequest(hObject,event)
ButtonName = questdlg('Close window?', ...
'Close Check', ...
'Yes', 'No','No');
switch ButtonName
case 'Yes'
delete(hObject);
case 'No'
return
end
then tested it with a simple script.
hObject = figure;
set(hObject,'CloseRequestFcn',@closeRequest)
plot(rand(10))
title('check close figure')
hObjects2 = figure;
plot(rand(100))
title('normally close figure')
by doing this only the first 'checked close' figure asks for the close dialog.

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