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 #include &lt;qdebug.h&gt;
 #include &lt;QApplication&gt;
 #include &lt;QLineEdit&gt;
 #include &lt;QValidator&gt;

 #include &quot;ui_validators.h&quot;

 class ValidatorWidget : public QWidget, public Ui::ValidatorsForm
 {
     Q_OBJECT
 public:
     ValidatorWidget(QWidget *parent = 0);

 private slots:
     void updateValidator();
     void updateDoubleValidator();
     void _setLocale(const QLocale &amp;l) { setLocale(l); updateValidator(); updateDoubleValidator(); }

 private:
     QIntValidator *validator;
     QDoubleValidator *doubleValidator;
 };

 ValidatorWidget::ValidatorWidget(QWidget *parent)
     : QWidget(parent)
 {
     setupUi(this);

     connect(localeSelector, SIGNAL(localeSelected(QLocale)), this, SLOT(_setLocale(QLocale)));

     connect(minVal, SIGNAL(editingFinished()), this, SLOT(updateValidator()));
     connect(maxVal, SIGNAL(editingFinished()), this, SLOT(updateValidator()));
     connect(editor, SIGNAL(editingFinished()), ledWidget, SLOT(flash()));

     connect(doubleMaxVal, SIGNAL(editingFinished()), this, SLOT(updateDoubleValidator()));
     connect(doubleMinVal, SIGNAL(editingFinished()), this, SLOT(updateDoubleValidator()));
     connect(doubleDecimals, SIGNAL(valueChanged(int)), this, SLOT(updateDoubleValidator()));
     connect(doubleFormat, SIGNAL(activated(int)), this, SLOT(updateDoubleValidator()));
     connect(doubleEditor, SIGNAL(editingFinished()), doubleLedWidget, SLOT(flash()));

     validator = 0;
     doubleValidator = 0;
     updateValidator();
     updateDoubleValidator();
 };

 void ValidatorWidget::updateValidator()
 {
     QIntValidator *v = new QIntValidator(minVal-&gt;value(), maxVal-&gt;value(), this);
     v-&gt;setLocale(locale());
     editor-&gt;setValidator(v);
     delete validator;
     validator = v;

     QString s = editor-&gt;text();
     int i = 0;
     if (validator-&gt;validate(s, i) == QValidator::Invalid) {
         editor-&gt;clear();
     } else {
         editor-&gt;setText(s);
     }
 }

 void ValidatorWidget::updateDoubleValidator()
 {
     QDoubleValidator *v
         = new QDoubleValidator(doubleMinVal-&gt;value(), doubleMaxVal-&gt;value(),
                                 doubleDecimals-&gt;value(), this);
     v-&gt;setNotation(static_cast&lt;QDoubleValidator::Notation&gt;(doubleFormat-&gt;currentIndex()));
     v-&gt;setLocale(locale());
     doubleEditor-&gt;setValidator(v);
     delete doubleValidator;
     doubleValidator = v;

     QString s = doubleEditor-&gt;text();
     int i = 0;
     if (doubleValidator-&gt;validate(s, i) == QValidator::Invalid) {
         doubleEditor-&gt;clear();
     } else {
         doubleEditor-&gt;setText(s);
     }
 }

 int main(int argc, char **argv)
 {
     Q_INIT_RESOURCE(validators);

     QApplication app(argc, argv);

     ValidatorWidget w;
     w.show();

     return app.exec();
 }

 #include &quot;main.moc&quot;</pre>
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