Validators Example


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  #include "validatorwidget.h"

  #include <QtWidgets>

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

      connect(localeSelector, &LocaleSelector::localeSelected,
              this, &ValidatorWidget::setLocale);
      connect(localeSelector, &LocaleSelector::localeSelected,
              this, &ValidatorWidget::updateValidator);
      connect(localeSelector, &LocaleSelector::localeSelected,
              this, &ValidatorWidget::updateDoubleValidator);

      connect(minVal, &QSpinBox::editingFinished,
              this, &ValidatorWidget::updateValidator);
      connect(maxVal, &QSpinBox::editingFinished,
              this, &ValidatorWidget::updateValidator);
      connect(editor, &QLineEdit::editingFinished,
              ledWidget, &LEDWidget::flash);

      connect(doubleMaxVal, &QDoubleSpinBox::editingFinished,
              this, &ValidatorWidget::updateDoubleValidator);
      connect(doubleMinVal, &QDoubleSpinBox::editingFinished,
              this, &ValidatorWidget::updateDoubleValidator);
      connect(doubleDecimals, QOverload<int>::of(&QSpinBox::valueChanged),
              this, &ValidatorWidget::updateDoubleValidator);
      connect(doubleFormat, QOverload<int>::of(&QComboBox::activated),
              this, &ValidatorWidget::updateDoubleValidator);
      connect(doubleEditor, &QLineEdit::editingFinished,
              doubleLedWidget, &LEDWidget::flash);

      updateValidator();
      updateDoubleValidator();
  }

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

      QString s = editor->text();
      int i = 0;
      if (v->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());
      delete doubleEditor->validator();
      doubleEditor->setValidator(v);

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