QLineEdit textEdited() and inputMask

#include <QDebug>

class MainWindow : public QMainWindow
{
    Q_OBJECT
public:
    MainWindow(QWidget *parent = 0)
        : QMainWindow(parent)
    {
        setCentralWidget(edit = new QLineEdit(this));
        connect(edit, SIGNAL(textEdited(QString)), this, SLOT(onTextEdited()));
        flipTimer.start(2000, this);
    }
    void timerEvent(QTimerEvent *e)
    {
        if (e->timerId() == timer.timerId()) {
            edit->setStyleSheet(QString());
            timer.stop();
        } else if (e->timerId() == flipTimer.timerId()) {
            edit->setInputMask(edit->inputMask().isEmpty() ? "000.000.000.000;_" : 0);
        } else {
            QMainWindow::timerEvent(e);
        }
    }
public slots:
    void onTextEdited()
    {
        edit->setStyleSheet("background: red");
        timer.start(1000, this);
    }
private:
    QBasicTimer timer, flipTimer;
    QLineEdit *edit;
};

#include "main.moc"


int main(int argc, char **argv)
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}