//从该类继一个自己的类

    class IntelliRealTimeZoomObjectReactor : public  McDbObjectReactor
    {
    public:
        virtual void    openedForModify(const McDbObject* dbObj);

        static IntelliRealTimeZoomObjectReactor s_reactor;
    };
    // 
    IntelliRealTimeZoomObjectReactor 
    IntelliRealTimeZoomObjectReactor::s_reactor;
    void    IntelliRealTimeZoomObjectReactor::openedForModify(const McDbObject* dbObj)
    {
        McApDocument* pDoc = dbObj->database()->GetDocument();
        if(pDoc != NULL)
        {
            IntelliRealTimeZoom* pRealTimZoom = IntelliCmdDocDataContainer::Instance().docData(pDoc)->RealTimeZoom();
            pRealTimZoom->ReSetData();
        }
    }

    // 调用McDbObject::addReactor,注册反应器
    spViewport->addReactor(&(IntelliRealTimeZoomObjectReactor::s_reactor) );

    // 调用McDbObject::removeReactor(),注消反应器
    spViewport->removeReactor(&(IntelliRealTimeZoomObjectReactor::s_reactor) );