Problem with Toggling Invisibility of Edit Text Box

Question

Caleb Helmen 2020-1-23

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/501654-problem-with-toggling-invisibility-of-edit-text-box

评论： Caleb Helmen 2020-1-28

I've been trying to toggle the invisibility of a text box and its labels using the state buttons in Matlab, but can't figure out why it doesn't work.

There aren't any error messages popping up, just that when I press the state button in my GUI, nothing happens.

function StateButton_Pushed(app, eventdata)
    button_state = get(app.StateButton, 'Value');
    if button_state == get(app.StateButton, 'Max')
        set(app.StateEditFieldLabel, 'Visible', 'on');
        set(app.StateEditField, 'Visible','on');
    elseif button_state == get(app.StateButton, 'Min')
        set(app.StateEditFieldLabel, 'Visible', 'off');
        set(app.StateEditField, 'Visible','off');
    end
end

Also I have the StateEditField and StateEditFieldLabel both preset to be invisible in the constructor.

What is the problem here?

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Caleb Helmen 2020-1-24

Thank you! I'll try that.

StateButton is a toggle button. Also what exactly does drawnow() do?

Geoff Hayes 2020-1-24

编辑：Geoff Hayes 2020-1-24

drawnow updates the figure and processes the callbacks. Is there something in the eventdata that might help you determine the state of the toggle button?

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Answer 1

Allen 2020-1-24

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With App Designer you need to look at the Object's value property as you are doing. However, it will return a logical value. If it is depressed it will return 1 (true), else it will return 0 (false).

function StateButton_Pushed(app, eventdata)
    value = app.StateButton.Value;
    if value % I am considering this the pressed state
        set(app.StateEditFieldLabel, 'Visible', 'on');
        set(app.StateEditField, 'Visible','on');
    elseif ~value % I am considering this the normal state
        set(app.StateEditFieldLabel, 'Visible', 'off');
        set(app.StateEditField, 'Visible','off');
    end
end