AppDesigner - Changing EditField font size

Question

Abdullah Wasi 2021-5-23

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https://ww2.mathworks.cn/matlabcentral/answers/837508-appdesigner-changing-editfield-font-size

评论： Abdullah Wasi 2021-5-27

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?

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Mario Malic 2021-5-24

Try adding drawnow at the end of callback.

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Answer 1

Adam Danz 2021-5-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/837508-appdesigner-changing-editfield-font-size#answer_707845

编辑：Adam Danz 2021-5-26

在 MATLAB Online 中打开

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    