main.cpp Example File

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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"