can i call app designer CallBack Functions outside the app ?

hello

i want to know if it is possible to call for example

buttonpushedcallback()

from an external .m script

so i want to process some data in my matlab script then i call callbacks functions

i tried this

a=myapp
a.buttonpushedcallback(a)

but it gave me error no class or public property called buttonpushedcallback in myapp

Answer 1

[Adam]

Yes, it is possible, but you need to understand the basics of function scope.

a=myapp
a.buttonpushedcallback(a)

would be wrong in all contexts. You either put a. at the front or you pass a in as an argument, you don't do both because they amount to the same thing so you would be passing it in twice, as the first two arguments with this syntax.

You use

a.buttonpushedcallback( )

or

buttonpushedcallback( a )

if a is an object of a class and buttonpushedcallback is a method of that class. For a method that is not part of the class you just call

buttonpushedcallback( )

If you really want you can have a method that is external to the class that still takes an object of it as first argument:

buttonpushedcallback( a )

but you cannot use the a.buttonpushedcallback syntax here. Quite why you would want to do this I don't know, since if it takes the class object as argument it should be a method of the class in general, but it is possible.

For a callback though you generally need to pass in two arguments representing the source and event data though also for it to be recognised as a valid callback signature.

[Ibrahim Essam]

thank you for your Explanation , but my problem is that all the callback functions are private methods and i want to change it to be public so i was asking if there is a way to do that ?

[Adam]

The callback itself has to be private in appdesigner, there's no reason at all to make it public anyway, but what you do in that private function is entirely up to you. You can call a function from anywhere else within that private callback. e.g.

function buttonpushedcallback( app, event )
   myFunction( ... )
end

[Sarah Bell]

Hi Adam! Just wondering if you could help me? This is pretty unrelated to the original question but I'm trying to use appdesigner to build an RT60 calculator for an assignment for my university. So far, I'm having no issues with the code I have written myself, but the code that matlab has generated has a section that is as follows:

    methods (Access = private)

        function createComponents(app)

The program is finding issues with the '=', and the ')' on the first line of code, and 'function' in the second line, and I cannot for the life of me figure out how to fix this issue. Any help would be greatly appreciated and you're the only person I've come accross with a working knowledge of appdesigner (even my lecturers have no idea how it works).

[Adam]

That sounds like you just ave a syntax error somewhere above that in your code. Check for a missing 'end' from previous functions or method blocks. Selecting everything (e.g. Ctrl + A) and then auto-indenting with Ctr + I can help you to easily spot missing 'end' statements.

[Sarah Bell]

Thank you so much! This just fixed my code, and now I can not only submit it 14+ hours early but I'm probably going to get the best mark I've ever had on any coding based coursework, so thank you again!

While I have you here, my boyfriend is also doing coding coursework and was wondering if you happen to know anything about the Kernighan-Lin (or KL) algorithm in Matlab?