main.cpp Example File

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 #include <QApplication>
 #include <QAxFactory>
 #include <QTabWidget>
 #include <QScopedPointer>
 #include <QTimer>

 class Application;
 class DocumentList;

 class Document : public QObject
 {
     Q_OBJECT

     Q_CLASSINFO("ClassID", "{2b5775cd-72c2-43da-bc3b-b0e8d1e1c4f7}")
     Q_CLASSINFO("InterfaceID", "{2ce1761e-07a3-415c-bd11-0eab2c7283de}")

     Q_PROPERTY(Application *application READ application)
     Q_PROPERTY(QString title READ title WRITE setTitle)

 public:
     explicit Document(DocumentList *list);
     virtual ~Document();

     Application *application() const;

     QString title() const;
     void setTitle(const QString &title);

 private:
     QScopedPointer <QWidget> m_page;
 };

 class DocumentList : public QObject
 {
     Q_OBJECT

     Q_CLASSINFO("ClassID", "{496b761d-924b-4554-a18a-8f3704d2a9a6}")
     Q_CLASSINFO("InterfaceID", "{6c9e30e8-3ff6-4e6a-9edc-d219d074a148}")

     Q_PROPERTY(Application* application READ application)
     Q_PROPERTY(int count READ count)

 public:
     explicit DocumentList(Application *application);

     int count() const;
     Application *application() const;

 public slots:
     Document *addDocument();
     Document *item(int index) const;

 private:
     QList<Document *> m_list;
 };

 class Application : public QObject
 {
     Q_OBJECT

     Q_CLASSINFO("ClassID", "{b50a71db-c4a7-4551-8d14-49983566afee}")
     Q_CLASSINFO("InterfaceID", "{4a427759-16ef-4ed8-be79-59ffe5789042}")
     Q_CLASSINFO("RegisterObject", "yes")

     Q_PROPERTY(DocumentList* documents READ documents)
     Q_PROPERTY(QString id READ id)
     Q_PROPERTY(bool visible READ isVisible WRITE setVisible)

 public:
     explicit Application(QObject *parent = nullptr);
     DocumentList *documents() const;

     QString id() const { return objectName(); }

     void setVisible(bool on);
     bool isVisible() const;

     QTabWidget *window() const { return m_ui.data(); }

 public slots:
     void quit();

 private:
     QScopedPointer <DocumentList> m_docs;
     QScopedPointer <QTabWidget> m_ui;
 };

 Document::Document(DocumentList *list)
 : QObject(list)
 {
     QTabWidget *tabs = list->application()->window();
     m_page.reset(new QWidget(tabs));
     m_page->setWindowTitle(tr("Unnamed"));
     tabs->addTab(m_page.data(), m_page->windowTitle());

     m_page->show();
 }

 Document::~Document()
 {
 }

 Application *Document::application() const
 {
     return qobject_cast<DocumentList *>(parent())->application();
 }

 QString Document::title() const
 {
     return m_page->windowTitle();
 }

 void Document::setTitle(const QString &t)
 {
     m_page->setWindowTitle(t);

     QTabWidget *tabs = application()->window();
     int index = tabs->indexOf(m_page.data());
     tabs->setTabText(index, m_page->windowTitle());
 }

 DocumentList::DocumentList(Application *application)
 : QObject(application)
 {
 }

 Application *DocumentList::application() const
 {
     return qobject_cast<Application *>(parent());
 }

 int DocumentList::count() const
 {
     return m_list.count();
 }

 Document *DocumentList::item(int index) const
 {
     return m_list.value(index, nullptr);
 }

 Document *DocumentList::addDocument()
 {
     Document *document = new Document(this);
     m_list.append(document);

     return document;
 }

 Application::Application(QObject *parent)
 : QObject(parent),
   m_ui(new QTabWidget),
   m_docs(new DocumentList(this))
 {
     setObjectName(QStringLiteral("From QAxFactory"));
 }

 DocumentList *Application::documents() const
 {
     return m_docs.data();
 }

 void Application::setVisible(bool on)
 {
     m_ui->setVisible(on);
 }

 bool Application::isVisible() const
 {
     return m_ui->isVisible();
 }

 void Application::quit()
 {
     m_docs.reset();
     m_ui.reset();
     QTimer::singleShot(0 /*ms*/, qApp, &QCoreApplication::quit);
 }

 #include "main.moc"

 QAXFACTORY_BEGIN("{edd3e836-f537-4c6f-be7d-6014c155cc7a}", "{b7da3de8-83bb-4bbe-9ab7-99a05819e201}")
    QAXCLASS(Application)
    QAXTYPE(Document)
    QAXTYPE(DocumentList)
 QAXFACTORY_END()

 int main(int argc, char *argv[])
 {
     QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
     QApplication app(argc, argv);
     app.setQuitOnLastWindowClosed(false);

     // started by COM - don't do anything
     if (QAxFactory::isServer())
         return app.exec();

     // started by user
     Application appobject;
     appobject.setObjectName(QStringLiteral("From Application"));

     QAxFactory::startServer();
     QAxFactory::registerActiveObject(&appobject);

     appobject.window()->setMinimumSize(300, 100);
     appobject.setVisible(true);

     QObject::connect(&app, &QGuiApplication::lastWindowClosed, &appobject, &Application::quit);

     return app.exec();
 }