Using the matlab app designer, I want to somehow run a function that can modify data within the app without specifically calling it.

Question

Justus Quint Von Lengerke 2023-7-14

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回答： Walter Roberson 2023-7-18

I have a complicated program that includes hundreds of sub functions -- all of which are managed through a GUI made using the Matlab APP designer. One of the things I want to do is to call a standard function in my directory ("status.m"), and using this status function, edit properties within the app. However, even if app is in the working space, to edit any properties in the app, I need to call the app ("app.propertyIWantToEdit"). The only solution I know of so far would be to call the app as an input function through every function I have, which would be very inefficient and tedious.

Is there a way I could make a function that, in a sub function, independently calls up the app so it can modify data/change variables, so I don't need to manually call the app in the outer function?

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Justus Quint Von Lengerke 2023-7-14

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Looking back my description was very confusing. Sorry about that.

It's proprietary code so I'll make an example of exactly what is happening.

This is an example of what currently exists

function output(a,b)
    if a<b
        disp("a<b")
    end
end   

The "output" function is deep within the code, so a random functions will call it if certain things occur.

Now we have a GUI that currently operates a case structure system to display information onto a "label" on the GUI. For many things in the code, the outputs will occur in a nested function on local variables to the app, so using "app" as an input is not a problem.

function libArray = libGenerator(app)
    app.x = "a";
    app.y = "b";
    %And now if we can use our status system
    if app.a ~= app.b
        status(app,4) %"4" being a predefined status we use in the GUI.
    end
end

function status(app,statusVal)
    switch statusVal
        case 1
            statusString = "Case 1";
        case 4
            statusString  = "A not equal to B";
    end
    app.StatusLabelBox.Text = statusString;
end

Ok, so now that's how both parts work. Currently, most of the systems we use can be done using the function shown just above, using the status function. In essence, you call app as an arugment into the function, and then that function updates the label text.

The problem is, the GUI is being built on top of older code, which utilizes the command line to output much of the data -- part of the goal with the GUI is to move that data away from the command line and into tables that can be saved into files (also happens within the status function).

But the issue is, with the code that is very deep in the older program, the GUI app is no longer included as a function argument.

It is NOT:

function f1(app,a)
    function f2(app,b)
        function f3(app,c)
        end
    end
end

But rather

function f1(a)
    function f2(b)
        function f3(c)
            
        end
    end
end

For compatability purposes, we cannot add app as an arugment to the function, but the goal is to call status within the function f3, for example, and have it work without needing to call the app.

I've tried looking at using global variables (global app) and getters and setters, but global app seems very insecure, and getters and setters still require the need to call "app" at one time or another.

Mario Malic 2023-7-17

在 MATLAB Online 中打开

You can use findall to find handle of the app and do whatever you need. However, you might need to specify something aditionally that you can identify your app with such as Name or Tag.

This will return handle of all opened figures, and will try to get the RunningAppInstance property.

% Get app handle
app = get(findall(groot, 'type', 'figure'), 'RunningAppInstance');

Justus Quint Von Lengerke 2023-7-18

Thank you all for the responses. A few things got in the way meaning I'll be away from this project for a bit but I'll give these all a try and I'll let you know which method I went with. Thanks again!

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Answer 1

Walter Roberson 2023-7-18

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1996203-using-the-matlab-app-designer-i-want-to-somehow-run-a-function-that-can-modify-data-within-the-app#answer_1274688

在 MATLAB Online 中打开

function status(varargin)
    persistent app
    
    switch nargin
        case 1
            assert(~isempty(app), 'status must be called with app before it can be called without app');
            statusValue = varargin{1};
        case 2
            app = varargin{1};
            statusValue = varargin{2};
        otherwise
            error('status() must be called with 1 or 2 parameters');
    end
    switch statusVal
        case 1
            statusString = "Case 1";
        case 4
            statusString  = "A not equal to B";
    end
    app.StatusLabelBox.Text = statusString;
end

status() must be called with app provided at least once before it is called without app provided. If called with a single parameter and this is not the first call then it uses the remembered app.

This code relies upon app being a handle class.

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Using the matlab app designer, I want to somehow run a function that can modify data within the app without specifically calling it.

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Using the matlab app designer, I want to somehow run a function that can modify data within the app without specifically calling it.

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