You can create a property called
Last_Selection = '';
In the DropDownMenu callback
function DropDownValueChanged(app,event)
if isempty(app.Last_Selection)
app.Last_Selection = app.DropDownMenu.Value % Initialises Last_Selection on first callback
else
if isequal(app.Last_Selection, app.DropDownMenu.Value)
% Hide something
% I am not sure how it goes with hiding/removing dropdown values
% First you have to assign to some other dropdown value and then remove it
% if you don't want errors
% ind = find (app.DropDownMenu.Value == app.DropDownMenu.Items); % get index of data to be removed
% app.DropDownMenu.Value = change_to_other_value
% app.DropDownMenu.Items{1,ind} = ''; % Test if it actually works
else
app.Last_Selection = app.DropDownMenu.Value
end
end
end
The question is, does the callback gets executed if the DropDownMenu.Value stays the same?
It might be more intuitive to the user what to do to remove the dropdown value, by adding the button instead.
