main.cpp

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// ======================================================================
//  main.cpp
// ======================================================================
//                   This file is a part of the book 
//             "Qt 5.10 Professional programming with C++"
//                       http://qt-book.com
// ======================================================================
//  Copyright (c) 2017 by Max Schlee
// ======================================================================

#include <QtWidgets>

// ======================================================================
class NameValidator : public QValidator {
public:
    NameValidator(QObject* parent) : QValidator(parent)
    {
    }

    virtual State validate(QString& str, int&) const
    {
        QRegExp rxp = QRegExp("[0-9]");
        if (str.contains(rxp)) {
            return Invalid;
        }
        return Acceptable;
    }
};


// ----------------------------------------------------------------------
int main (int argc, char** argv)
{
    QApplication app(argc, argv);
    QWidget      wgt;

    QLabel* plblText = 
           new QLabel("&Name (The digits will not be accepted!):");

    QLineEdit* ptxt = new QLineEdit;

    NameValidator* pnameValidator = new NameValidator(ptxt);
    ptxt->setValidator(pnameValidator);
    plblText->setBuddy(ptxt);

    //Layout setup
    QVBoxLayout* pvbxLayout = new QVBoxLayout;    
    pvbxLayout->addWidget(plblText);
    pvbxLayout->addWidget(ptxt);
    wgt.setLayout(pvbxLayout);
    wgt.show();

    return app.exec();
}