Code still functioning according to lines of code I have deleted

Question

Ruben 2024-7-30

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2141616-code-still-functioning-according-to-lines-of-code-i-have-deleted

回答： Aditya 2024-7-31

I'm trying to make a text box that the user can type into, which then retreives and prints that text when the user clicks enter. Two days ago it was working perfectly. Yesterday it stopped working properly. It prints the currently held text AND THEN updates with the what the user has input. So if I type in "bob" and click enter, nothing displays. If I delete "bob" and type in "peter", and click enter, it displays bob. Click enter again, and it displays "peter".

It got to the point that I just deleted the code and tried to start over. FOR SOME REASON, it still acts exactly the same, updating the text only when I click enter, despite the fact that I have no lines of code that refer to the enter key.

This is what I have right now:

function codeComponentResponse
  fig = uifigure('position',[2 50 637 641]);
  TextArea = uieditfield(fig, 'Position',[100 100 500 30]); 
  
  fig.WindowKeyPressFcn = {@CoolGuy, fig, TextArea};
  
    function CoolGuy(src, event, figure, field)
        text = field.Value;
        disp(text)
    end
end

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VBBV 2024-7-30

@Ruben If I delete "bob" and type in "peter", How did you delete "bob" in the text field ? Using keys or mouse ?

Try to enter twice after typing the text "bob" in edit field , it works fine.

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Answer 1

Aditya 2024-7-31

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Hi Ruben,

The issue you're experiencing may be due to the timing of event handling in MATLAB. Specifically, the "WindowKeyPressFcn" might be capturing the key press event before the "uieditfield" has updated its value. To ensure the text is updated correctly, you can use a different callback function that triggers after the text is modified.

Here’s an improved version of your code using the "ValueChangedFcn" of the "uieditfield" to ensure the text is updated correctly when the enter key is pressed:

function codeComponentResponse
  fig = uifigure('Position', [2 50 637 641]);
  TextArea = uieditfield(fig, 'text', 'Position', [100 100 500 30]);
  
  % Set the callback for when the text value changes
  TextArea.ValueChangedFcn = @(src, event) CoolGuy(src, event, TextArea);
  
  function CoolGuy(src, event, field)
      text = field.Value;
      disp(text)
  end
end