How to identify a calling function inside a called function?

function func3(app)
            app.ApplyButtonPushed();
            
        end
    end
    

    % Callbacks that handle component events
    methods (Access = private)

       

        % Callback function: AbsoluteEditField, ApplyButton, 
        % RelativeEditField
        function ApplyButtonPushed(app, event)
            app.EditField.Value = (event.Source.Tag) %% this does not work
            if event.source = app.EditField..... %% this works
            if event.source = app.func3..... %this does not work       
        end

        % Value changed function: EditField_2
        function EditField_2ValueChanged(app, event)
            value = app.EditField_2.Value;
            app.func3(event);
        end
    end

Here is the idea :

editing a textbox calls a function that subsequently calls another function (like a pushed button here). I am not sure how I can execute this and more importantly, how I can know from where the button pushed function was called.

For editfields, the event.Source would have the information, but when called from a function like func3, there is no such information.

How do I access the source or name of the function inside the buttonpushed function in this case??

[Walter Roberson]

app.ApplyButtonPushed();

When you do that, how is the function getting its event parameter?

[Biraj Khanal]

Can be done two ways :

Inside the value change function of app.EditField , i could call

app.ApplyButtonPushed(event);

what I have done here is simply used the existing callback of the button pushed with the app.EditField which apparently sends the event as parameter.

The problem is I can't do:

function func3(app)
            app.ApplyButtonPushed(event);
            
end

Or something to that effect so that I could identify inside the ApplyButtonPushed function where it is triggered from. I want to know that func3 is where the ApplyButtonPushed is called from.

And thanks for pointing out the confusion. I did not include the previous step.

Answer 1

[aditi bagora]

Hello Biraj,

I understand that you are looking to determine the calling function within your “ButtonPushedFcn” callback function.

To identify the source of the triggered event:

• If the source function is a triggered event, you can pass ‘eventData.Source’ as a parameter to your “ButtonPushedFcn” function.
• If the source does not contain event information, you can pass null as a parameter.

To find the name of the calling function, you can use the “dbstack()” function provided by MATLAB. This function returns the function call stack.

The first function in the stack represents the called function, while the second function in the stack indicates the caller.

To extract details of the caller from the stack object, you can access the 'name' field of the stack at the second position, like this:

stack = dbstack();

calling_fn_name = stack(2).name;

disp(calling_fn_name);

Please refer the following documentation for more details on “dbstack()”

Function call stack - MATLAB dbstack - MathWorks India

Hope this helps!

Regards,

Aditi

Answer 2

[Walter Roberson]

See gcbo