main.cpp Example File

 /****************************************************************************
 **
 ** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
 ** Contact: http://www.qt-project.org/
 **
 ** This file is part of the examples of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** 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 Nokia Corporation and its Subsidiary(-ies) 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"