qt-everywhere-src-5.15.1/qtdeclarative/src/imports/qtquick2/plugin.cpp

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#include <QtQml/qqmlextensionplugin.h>

#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
#include <QtQml/private/qqmlengine_p.h>
#include <QtQmlModels/private/qqmlmodelsmodule_p.h>
#if QT_CONFIG(qml_worker_script)
#include <QtQmlWorkerScript/private/qqmlworkerscriptmodule_p.h>
#endif
#endif // QT_VERSION < QT_VERSION_CHECK(6, 0, 0)

#include <private/qtquick2_p.h>

QT_BEGIN_NAMESPACE

//![class decl]
class QtQuick2Plugin : public QQmlExtensionPlugin
{
    Q_OBJECT
    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
public:
    QtQuick2Plugin(QObject *parent = nullptr) : QQmlExtensionPlugin(parent)
    {
        volatile auto registration = &qml_register_types_QtQuick;
        Q_UNUSED(registration);
    }

    void registerTypes(const char *uri) override
    {
        Q_ASSERT(QLatin1String(uri) == QLatin1String("QtQuick"));
        Q_UNUSED(uri);
        moduleDefined = true;
#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
        QQmlEnginePrivate::registerQuickTypes();
        QQmlModelsModule::registerQuickTypes();
#if QT_CONFIG(qml_worker_script)
        QQmlWorkerScriptModule::registerQuickTypes();
#endif
#endif
        QQmlQtQuick2Module::defineModule();
    }

    ~QtQuick2Plugin() override
    {
        if (moduleDefined)
            QQmlQtQuick2Module::undefineModule();
    }

    bool moduleDefined = false;
};
//![class decl]

QT_END_NAMESPACE

#include "plugin.moc"