main.cpp Example File

 /****************************************************************************
 **
 ** 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 <QApplication>
 #include <QCommandLineParser>
 #include <QDesktopWidget>

 #include "mainwindow.h"

 int main(int argc, char *argv[])
 {
     QApplication app(argc, argv);
     QCoreApplication::setApplicationName(MainWindow::tr("Icons"));
     QCoreApplication::setApplicationVersion(QT_VERSION_STR);
     QCommandLineParser commandLineParser;
     commandLineParser.setSingleDashWordOptionMode(QCommandLineParser::ParseAsLongOptions);
     commandLineParser.addHelpOption();
     commandLineParser.addVersionOption();
     QCommandLineOption noHighDpiPixmapOption("no-highdpi-pixmaps",
                                              "Disable High DPI image loading (Qt::AA_UseHighDpiPixmaps)");
     commandLineParser.addOption(noHighDpiPixmapOption);
         commandLineParser.addPositionalArgument(MainWindow::tr("[file]"), MainWindow::tr("Icon file(s) to open."));
     commandLineParser.process(QCoreApplication::arguments());

     if (!commandLineParser.isSet(noHighDpiPixmapOption))
         QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);

     MainWindow mainWin;
     if (!commandLineParser.positionalArguments().isEmpty())
         mainWin.loadImages(commandLineParser.positionalArguments());

     const QRect availableGeometry = QApplication::desktop()->availableGeometry(&mainWin);
     mainWin.resize(availableGeometry.width() / 2, availableGeometry.height() * 2 / 3);
     mainWin.move((availableGeometry.width() - mainWin.width()) / 2, (availableGeometry.height() - mainWin.height()) / 2);

     mainWin.show();
     return app.exec();
 }