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ValueChanged event not fired on uieditfield when setting property Value

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Andreas Klotzek
Andreas Klotzek on 10 Jan 2019
Commented: cedric manoury on 21 Oct 2020
Hi
I have a uieditfield:
u = uieditfield();
The I attach a listener to the ValueChangedFcn
u.ValueChangedFcn = @(s,e)disp(e);
If I type into the edit field the my listener gets called as expected. But if I set the property directly
u.Value = '2';
no event is fired.
Is there something wrong with what I am doing or with Matlab?
  4 Comments
J. Alex Lee
J. Alex Lee on 24 Apr 2020
Is this a concious decision based on some programming principle? It seems to me the more obvious/expected behavior is that changing the "Value", no matter how, triggers the "ValueChangedFcn"...otherwise they should have called it the "UIElementManipulatedFcn"...
I understand the wrapper concept as suggested by Adam and demonstrated by Jan, but it seems a cumbersome solution especially if you want to ensure your event object looks the same as it does from the manipulation of the ui element, and you want to do this for many types of ui elements...
Am I missing something?

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Answers (1)

Jan
Jan on 11 Jan 2019
Edited: Jan on 11 Jan 2019
You can write a wrapper for setting the value programmatically, which calls the callback manually:
function SetMyValue(objectH, Value)
objectH.Value = Value;
myEvent.Origin = 'Value set programmatically';
objectH.ValueChangedFcn(objectH, myEvent);
end
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