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++ // Copyright (C) 2017 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++
++ #include <QQuickStyle>
++
++ #include <QQmlApplicationEngine>
++ #include <QQmlContext>
++
++ #include <QGuiApplication>
++ #include <QIcon>
++
++ #include <QSettings>
++ #include <QOperatingSystemVersion>
++
++ using namespace Qt::StringLiterals;
++
++ static constexpr auto styleKey = "style"_L1;
++
++ int main(int argc, char *argv[])
++ {
++ QCoreApplication::setApplicationName("Gallery"_L1);
++ QCoreApplication::setOrganizationName("QtProject"_L1);
++
++ QGuiApplication app(argc, argv);
++
++ QIcon::setThemeName("gallery"_L1);
++
++ QSettings settings;
++ if (qEnvironmentVariableIsEmpty("QT_QUICK_CONTROLS_STYLE"))
++ QQuickStyle::setStyle(settings.value(styleKey).toString());
++
++ // If this is the first time we're running the application,
++ // we need to set a style in the settings so that the QML
++ // can find it in the list of built-in styles.
++ const QString styleInSettings = settings.value(styleKey).toString();
++ if (styleInSettings.isEmpty())
++ settings.setValue(styleKey, QQuickStyle::name());
++
++ QQmlApplicationEngine engine;
++
++ QStringList builtInStyles = { "Basic"_L1, "Fusion"_L1, "Imagine"_L1,
++ "Material"_L1, "Universal"_L1, "FluentWinUI3"_L1 };
++
++ if constexpr (QOperatingSystemVersion::currentType() == QOperatingSystemVersion::MacOS)
++ builtInStyles << "macOS"_L1 << "iOS"_L1;
++ else if constexpr (QOperatingSystemVersion::currentType() == QOperatingSystemVersion::IOS)
++ builtInStyles << "iOS"_L1;
++ else if constexpr (QOperatingSystemVersion::currentType() == QOperatingSystemVersion::Windows)
++ builtInStyles << "Windows"_L1;
++
++ engine.setInitialProperties({{ "builtInStyles"_L1, builtInStyles }});
++ engine.load(QUrl("qrc:/gallery.qml"_L1));
++ if (engine.rootObjects().isEmpty())
++ return -1;
++
++ return QCoreApplication::exec();
++ }