Qt 5.9 | Qt Widgets | Validators Example | main.cpp Example File

Qt 5.9.9 Reference Documentation

# 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"