[Interest] QLineEdit with a validator set

[Carl Schumann]

Hi,

I have a text input that I would like to validate.   So I am using a 
QLineEdit instance with a validator.   The user can not type an invalid 
value, which is good.

But users can type an intermediate value and type enter.  When they do 
so I would like to report an error so the user knows the input was not 
accepted.   It is not clear to me how to do this task, since the 
returnPressed signal is not emitted as a result of the input being 
invalid.   Currently I am exploring making my own subclass of QLineEdit.

Thanks for your time.   Any ideas would be appreciated please.

Sincerely,
Carl Schumann