How do I attach a QRegexpValidator to QFileDialog if I only want say identifier file names?

Question

The question is pretty straightforward and in the title.

Googling didn't help on this one. How do I get the QFileDialog to use a QValidator on its save name field?

Thanks.

Answer 1

The following is a bit of a kludge but appears to work.

You can use QObject::findChildren to locate the dialog's QLineEdit child widgets. Assuming there's only one such widget you can then apply the validator to that...

QFileDialog fd;
auto children = fd.findChildren<QLineEdit *>();
if (children.size() == 1) {

  /*
   * Apply a validator that forces the user to enter a name
   * beginning with a lower case `a' -- a bit pointless but...
   */
  QRegExpValidator validator(QRegExp("^a"));

  /*
   * Apply the validator.
   */
  children.front()->setValidator(&validator);
  fd.exec();
}

A quick test suggests it appears to work just fine. Like I said though: it does feel like a bit of a kludge.