How should I control label behavior when enabling/disabling elements in app designer?

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Chris 2023-12-1

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https://ww2.mathworks.cn/matlabcentral/answers/2055104-how-should-i-control-label-behavior-when-enabling-disabling-elements-in-app-designer

评论： Chris 2023-12-2

testapp.mlapp

I've attached a simple app wherein one listbox is disabled by default. In design view, this grays out the label text, as if gray text is a feature of a disabled UI element.

However, when you flip the switch to enable or disable the listboxes, the label colors don't change automatically. It appears that the gray label is in fact not a feature of a disabled element, so design view should not be doing this by default.

Am I missing something, or is this behavior in App Designer inconsistent?

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Answer 1

Image Analyst 2023-12-1

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https://ww2.mathworks.cn/matlabcentral/answers/2055104-how-should-i-control-label-behavior-when-enabling-disabling-elements-in-app-designer#answer_1364179

编辑：Image Analyst 2023-12-1

在 MATLAB Online 中打开

testapp.mlapp

Evidently the label next to the listbox is kind of its own control (partially).  You need to set properties for the label indepently of the main listbox for some properties.  Try this:
% Value changed function: Switch
function SwitchValueChanged(app, event)
value = app.Switch.Value;
% [app.ListBox.Enable, app.ListBox2.Enable] = deal(value);
if contains(value, 'On', 'IgnoreCase',true)
    % Enable the items inside the listbox.
    app.ListBox.Enable = 'On';
    app.ListBox2.Enable = 'On';
    % Enable the text labels beside the listbox.
    app.ListBoxLabel.Enable = 'On';
    app.ListBox2Label.Enable = 'On';
    % Enabled.  Make text green (optional)
    app.ListBoxLabel.FontColor = [0, 1, 0]
    app.ListBox2Label.FontColor = [0, 1, 0]
else
    % Enable the items inside the listbox.
    app.ListBox.Enable = 'off';
    app.ListBox2.Enable = 'off';
    % Enable the text labels beside the listbox.
    app.ListBoxLabel.Enable = 'On';
    app.ListBox2Label.Enable = 'On';
    % Disabled.  Make text red (optional)
    app.ListBoxLabel.FontColor = [1, 0, 0]
    app.ListBox2Label.FontColor = [1, 0, 0]
end
end