#include <QtGui/qstyleoption.h>
#ifndef QSTYLEOPTION_H
class QStyleOptionTitleBar: public QStyleOptionComplex{
   /* Some contents are skipped to improve readability */
   public: enum StyleOptionVersion{
      /* ... */
      Version = 1,
      /* ... */
   };
   /* ... */
};
#endif // QSTYLEOPTION_H