Postprocessing when user clicks apply/ok in a mask

I need to do some postprocessing (altering a block depending on the user selection in the mask) whenever a user clicks the APPLY or OK button on a simulink mask. I do not want to do this on the fly as many settings have to be made and the processing take a while, so doing this on each change over again gets very annoying.

How can I achieve this?

Same for preprocessing when a mask is opened. However this is not cruicial, as I) have found a workaround byusing the callback of a hidden combobox as a workaround. However it would be nice to clean that up too...

[Oliver Jaehrig]

Can you try using the Mask Initialization function callback to do that?

Regarding when a mask is opened, did you try to use the OpenFcn block callback?

Thank you for your feedback.

[Marcus]

The mask initialization callback is only loaded once, seems when the model is loaded first into memory, not on every opening of the mask. Also not on apply or close.

[Oliver Jaehrig]

@Marcus Mask Initialization code is not only called one when the model is loaded. Please see this documentation when you use R2025b to see when it gets executed:

https://www.mathworks.com/help/simulink/ug/initialize-mask.html#mw_9dd8ac3c-25e4-4e55-a68c-9b963d5f0d31

Here you can find the R2024b documentation:

https://www.mathworks.com/help/releases/R2024b/simulink/ug/initialize-mask.html#mw_9dd8ac3c-25e4-4e55-a68c-9b963d5f0d31

The expectation is that when you change the Mask Workspace the callback should execute. This can be also used to trigger the callbacks by using a hidden variable if needed which changes to trigger the callback.

If you prefer I recommend you to create a Technical Support case, where we can support you further.