validatorwidget.cpp Example File

 /****************************************************************************
 **
 ** Copyright (C) 2018 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the examples of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** Commercial License Usage
 ** Licensees holding valid commercial Qt licenses may use this file in
 ** accordance with the commercial license agreement provided with the
 ** Software or, alternatively, in accordance with the terms contained in
 ** a written agreement between you and The Qt Company. For licensing terms
 ** and conditions see https://www.qt.io/terms-conditions. For further
 ** information use the contact form at https://www.qt.io/contact-us.
 **
 ** BSD License Usage
 ** Alternatively, you may use this file under the terms of the BSD license
 ** as follows:
 **
 ** "Redistribution and use in source and binary forms, with or without
 ** modification, are permitted provided that the following conditions are
 ** met:
 **   * Redistributions of source code must retain the above copyright
 **     notice, this list of conditions and the following disclaimer.
 **   * Redistributions in binary form must reproduce the above copyright
 **     notice, this list of conditions and the following disclaimer in
 **     the documentation and/or other materials provided with the
 **     distribution.
 **   * Neither the name of The Qt Company Ltd nor the names of its
 **     contributors may be used to endorse or promote products derived
 **     from this software without specific prior written permission.
 **
 **
 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #include "validatorwidget.h"

 #include <QIntValidator>

 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);
     }
 }