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Enable / Disable specific listbox item

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Dan
Dan on 13 Oct 2014
Commented: Andy on 23 Oct 2020
Is there a way to disable an item in a listbox. Basically I want to have a listbox that displays a number of available items for selection but want a subset of these items to be greyed out (disabled).
I can (of course) just check for the forbidden item AFTER the user has selected it and tell him that this item is unavailable. But that seems in elegant. Alternatively, I could simply not list forbidden items to begin with but.... also inelegant.
Ideas?
Thanks!
Dan

Accepted Answer

Image Analyst
Image Analyst on 13 Oct 2014
You can't do that. The workarounds are the two you listed.

More Answers (1)

Robert Cumming
Robert Cumming on 13 Oct 2014
By using this FEX you can make it look like things are disabled:
function test
myStr{1} = 'Allowed';
myStr{2} = str2html ( 'Not Allowed', 'italic', true, 'colour', '#A0A0A0' );
myStr{3} = 'Allowed';
myStr{4} = 'Allowed';
myStr{5} = 'Allowed';
allowed = [1 0 1 1 1]; % flags of items allowed or not.
uicontrol ( 'style', 'listbox', 'position', [0 0 400 200], 'String', myStr, 'Callback', {@checkcb allowed} )
end
function checkcb ( obj, event, allowed )
if allowed(obj.Value) == 0
errordlg ( 'Not allowed' );
obj.Value = find ( allowed, 1, 'first' );
end
end
See example image:
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  3 Comments
Andy
Andy on 23 Oct 2020
See file exchange
https://uk.mathworks.com/matlabcentral/fileexchange/46755-str2html?s_tid=srchtitle

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