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main.cpp Example File
widgets/validators/main.cpp

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 #include <qdebug.h>
 #include <QApplication>
 #include <QLineEdit>
 #include <QValidator>

 #include "ui_validators.h"

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

 private slots:
     void updateValidator();
     void updateDoubleValidator();
     void _setLocale(const QLocale &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->value(), maxVal->value(), this);
     v->setLocale(locale());
     editor->setValidator(v);
     delete validator;
     validator = v;

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

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

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

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

     QApplication app(argc, argv);

     ValidatorWidget w;
     w.show();

     return app.exec();
 }

 #include "main.moc"