How can I edit an appdesigner's destructor

I'm using appdesigner for the first time, and like the way in which it combines an interface similar to a modern IDE with OO code

However, I'd like to edit the destructor of the class, in particular to call the destructors of its child windows (themselves other appdesigner apps, between which I pass data) which otherwise is not done. The region of text is just greyed out in the window. Any ideas?

Thank you!

Answer 1

[Nathan Kueterman]

In the Editor tab, top left there is a add callback button. Click this then for component dropdown choose your main window. Callback dropdown choose the close request function. Insert your custom destructor code in the code block it generated. (Took me a few weeks to discover where this was hidden)

[Jack]

Thank you very much! (If only I could now remember why I wanted to do that! :-P)

[RST]

Beware that the <main figure>CloseRequest(app, event) function is not called when the app is simply delete() -ed . This is addressed in this Stackoverflow article.

Having defined the CloseRequest function it is possible to call (for example)

close( myApp.UIFigure )

but this still does not help if the app is deleted by any other means.

This is for R2020a and possibly others.

Answer 2

[RST]

Given that the CloseRequest() function is is not called when an app is delete()-ed, I believe the most reliable solution is to listen to the UIFigure's ObjectBeingDeleted event.

This is only a bit more complicated than completing code in a callback. And better than trying to manually close() all the apps as i suggest in my comment, above.

.
.
.
methods (Access = private)
    % code to run before app is destroyed
    function onBeingDestroyed( app, src, evtdata)  %#ok<INUSD> 
        % my cleanup code here
    end
end % private methods
.
.
.
    % Code that executes after component creation
    function startupFcn(app)
           
        % listen to my ObjectBeingDestroyed event
        addlistener(app, ...
                    'ObjectBeingDestroyed', @app.onBeingDestroyed);
                    
    end