try this

Qt Code: 
  1. ...
  2.     int main(int argc, char* argv[])
  3.     {
  4.     QApplication app(argc, argv);
  5.  
  6.     // parse the commandline:
  7.     ...
  8.  
  9.     ScreenSaverWidget* widget = new ScreenSaverWidget;
  10.     widget->setAttribute(Qt::WA_DeleteOnClose);
  11.     QObject::connect(widget, SIGNAL(destroyed()), &app, SLOT(quit()));
  12.     switch(mode)
  13.     {
  14.     case ConfigurationMode:
  15.     configure();
  16.     return 0;
  17.  
  18.     case FullScreenMode:
  19.     new ScreenSaverEventFilter(widget);
  20.     widget->showFullScreen();
  21.     return app.exec();
  22.  
  23.     case PreviewMode:
  24.     {
  25.     widget->setWindowFlags(Qt::FramelessWindowHint|Qt::SubWindow);
  26.     ::SetParent(widget->winId(), parent);
  27.     RECT parentRect;
  28.     ::GetClientRect(parent, &parentRect);
  29.     widget->move(0,0);
  30.     widget->resize(parentRect.right, parentRect.bottom);
  31.     widget->show();
  32.     }
  33.     }
  34.  
  35.     }
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