I wand to display one ore moore QStackedWidget to paint inside a postscript image or a pdf...

the device to paint work but how i can enable scroll this QStackedWidget


Qt Code: 
  1. class QPdf : public QMainWindow
  2. {
  3.  
  4. //
  5. public: 
  6.     QPdf(const QString pdf_file)  {
  7.  
  8. setWindowTitle ( tr( "Pdf and Postscript display.. file %1 " ).arg(pdf_file));
  9. pages = 0;   
  10. spage = new QStackedWidget(this);
  11.  
  12.         GString *ownerPW, *userPW;
  13.         doc = new PDFDoc(new GString(pdf_file),ownerPW, userPW); 
  14.  
  15.         if (doc->isOk()) {
  16.         qDebug() << "### doc->isOk() "<< doc->isOk();
  17.         pages = doc->getNumPages();
  18.         qDebug() << "### pages "<< pages;
  19.  
  20.             for (int i=0;i<pages;i++) {
  21.                 int nowrender = i + 1;  /* render page pdf nr. */
  22.                 qDebug() << "### page item  "<< nowrender;
  23.                 SplashOutputDev *onepdf = new SplashOutputDev(QSize(doc->getPageWidth(nowrender),doc->getPageHeight(nowrender)));
  24.                 /////onepdf->InPaint(doc->getBitmap(nowrender));
  25.                 spage->addWidget(onepdf);
  26.                 }
  27.  
  28.     }
  29. setCentralWidget ( spage ); 
  30. }
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