AppDesigner - Changing EditField font size

Hi! I wanted to change the font size of an edit field while running the program by selecting the value from the drop down list. This is the event function:

function FontSizeDropDownValueChanged(app, event)
            value = app.FontSizeDropDown.Value;
            
            switch value
                case 8
                    app.EditField.FontSize = 8;
                case 10
                    app.EditField.FontSize = 10;
                case 12
                    app.EditField.FontSize = 12;
                case 14
                    app.EditField.FontSize = 14;
                case 16
                    app.EditField.FontSize = 16;
            end
            
            app.EditField.Value = value;
        end

and this is the idea:

However, when I select a value the font size doesn't change. The text does change, but not the font size. What mistake am I making?

[Mario Malic]

Try adding drawnow at the end of callback.

Answer 1

[Adam Danz]

My guess is that your list of font sizes are strings and the value returned to the callback function is a string. Since it's a string it's not matching any of the cases in the switch/case so the fontsize never changes.

Option 1 is to convert the string to a number using str2double.

Option 2 is to define the dropdown ItemsData property as numbers, not strings. Then the Value will return a string. See properties for more info.

Lastly, stop using a switch case. Assign the fontsize directly

    function FontSizeDropDownValueChanged(app, event)
            value = app.FontSizeDropDown.Value;
            app.EditField.FontSize = value;  % or str2double(value) depending on which option you choose
            app.EditField.Value = value;     % or num2str(value) if a string is needed.
    end    

[Abdullah Wasi]

Thank you, this works!