How can I do a shortcut with the up and down arrow to change the value by one of the Edit numeric field?

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IGNACIO SERRANO SANCHEZ-YBARGUEN 2022-3-24

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https://ww2.mathworks.cn/matlabcentral/answers/1679419-how-can-i-do-a-shortcut-with-the-up-and-down-arrow-to-change-the-value-by-one-of-the-edit-numeric-fi

回答： Ravi 2023-10-10

I'm doing a GUI and I want to change the value with the keyboard by using this code and making a callback of WindowsKeyReleaseFnc but I also used the KeyPressFcn and know it changes double, and instead of changing just one field it changes every field selected with the KeyPressFcn and I dont know yet how can I remove it.

key = event.Key;
value = app.Ibias_SH.Value
if strcmp(key,'downarrow')
    value=value-1;
    if value<0
        value=12
    end
elseif strcmp(key,'uparrow')
    value=value+1;
    if value>12
        value=0;
    end
end
app.Ibias_SH.Value = value;

Thanks

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Rik 2022-3-24

So you have this code both in the WindowsKeyReleaseFnc and in the KeyPressFcn? Why not have it in 1 place?

Your question is not very clear to me.

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Answer 1

Ravi 2023-10-10

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Hi IGNACIO SERRANO SANCHEZ-YBARGUEN,

If you want multiple EditField values to be changed when pressing the up and down arrows, create a keypress callback function in AppDesigner. Include all those EditField entries whose values are to be changed.

function UIFigureKeyPress(app, event)
    key = event.Key;
    value = app.CounterEditField.Value;
    value1 = app.Counter1EditField.Value;
    if ~strcmp(key, 'uparrow')
        value = value - 1;
        value1 = value1 - 1;
    elseif ~strcmp(key, 'downarrow')
        value = value + 1;
        value1 = value1 + 1;
    end
    app.CounterEditField.Value = value;
    app.Counter1EditField.Value = value1;
end 

In the above code, the keypress callback is applied to two EditField values (CounterEditField, Counter1EditField). When an up arrow is pressed, the value in both the edit fields get incremented and when a down arrow is pressed, the value gets decremented.

If you want to change the value by 1 but specific to only one EditField at a given instance of time, then I suggest you use a Spinner component instead of an EditField. In a Spinner component, you can increment and decrement the value by clicking on the component in the app without explicitly creating any callback functions.

Hope this helps.