[Qt-interest] QLineEdit font color based upon QValidator status

[lbutler3]

When QtCreator asks for a directory to put the project in the QLineEdit displays text in red whenever the input is invalid.  I'd like to do something similar in my application.  I have a QValidator-derived class assigned to my QLineEdit that can determine the status of the input, but what is the "right" way to get the QLineEdit to change font color based upon this status?  

Lee