main.cpp Example File | Qt Widgets 5.12.8

- Qt 5.12
- Qt Widgets
- Validators Example
- main.cpp Example File
- Qt 5.12.8 Reference Documentation

# main.cpp Example File

widgets/validators/main.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2016 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 <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"