Revision control
++ // Copyright (C) 2016 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++
++ #include <QApplication>
++
++ #ifndef QT_NO_SYSTEMTRAYICON
++
++ #include <QMessageBox>
++ #include "window.h"
++
++ int main(int argc, char *argv[])
++ {
++ QApplication app(argc, argv);
++
++ if (!QSystemTrayIcon::isSystemTrayAvailable()) {
++ auto choice = QMessageBox::critical(nullptr, QObject::tr("Systray"),
++ QObject::tr("I couldn't detect any system tray on this system."),
++ QMessageBox::Close | QMessageBox::Ignore);
++ if (choice == QMessageBox::Close)
++ return 1;
++ // Otherwise "lurk": if a system tray is started later, the icon will appear.
++ }
++ QApplication::setQuitOnLastWindowClosed(false);
++
++ Window window;
++ window.show();
++ return app.exec();
++ }
++
++ #else
++
++ #include <QLabel>
++ #include <QDebug>
++
++ int main(int argc, char *argv[])
++ {
++ QApplication app(argc, argv);
++ QString text("QSystemTrayIcon is not supported on this platform");
++
++ QLabel *label = new QLabel(text);
++ label->setWordWrap(true);
++
++ label->show();
++ qDebug() << text;
++
++ app.exec();
++ }
++
++ #endif