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

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     ** Alternatively, this file may be used under the terms of the GNU
     ** General Public License version 3.0 as published by the Free Software
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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"