how to make readonly in change but editable in add?

I was wondering how to make a field readonly when you click on it or want to
change the record. and i have done that with the readonly_feilds method. but
that makes it to where you cant add information to that feild when you add a
new record. is there something i can use where you are not able to edit a
feild in the change view, but when you add new, you are able to edit the
field until you press save? thanks alot
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