How to update GUI in matlab App during a callback

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Timo
Timo on 21 Apr 2022
Commented: Hiro on 21 Apr 2022
Hello
Environement: matlab R2021b and R2021a, windows 10
I would like to change the color of a button during a callback in an Matlab App created with the App Designer.
% Button pushed function: LoadButton
function LoadButtonPushed(app, event)
set(app.LoadButton,'BackgroundColor',[1, 0, 0])%set color of the button to red
%... do things..
set(app.LoadButton,'BackgroundColor',[0, 1, 0])%set color of the button to green
end
I see only the green button in the end, but not the red button while the callback function is running. It seems that there is something like a refresh or update, somthine like guidata in GUIDE is needed.
How do I update the user interface inbetween?
Many thanks and best wishes

Accepted Answer

Bruno Luong
Bruno Luong on 21 Apr 2022
Try to force refresh with drawnow
% Button pushed function: LoadButton
function LoadButtonPushed(app, event)
set(app.LoadButton,'BackgroundColor',[1, 0, 0])%set color of the button to red
drawnow
%... do things..
set(app.LoadButton,'BackgroundColor',[0, 1, 0])%set color of the button to green
drawnow
end
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More Answers (1)

Hiro
Hiro on 21 Apr 2022
the changes made by valuChanged callback functions are reflected later. If you want to see the changes dinamically, you should use valuChanging callback functions.

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R2021b

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