this is my code use, but it cant build error:cannot declare variable to be of abstract type 'QWSMouseHandler

can you help me ?



Qt Code: 
  1. #if defined(Q_OS_LINUX)
  2. 	QPoint qpoint = QWSMouseHandler::pos();
  3. 	Qt::MouseButtons buttons = Qt::NoButton;
  4. 	if (qFuzzyCompare(slideValue(), static_cast<qreal>(1.0f)))
  5. 	{
  6. 		if (event->key() == Qt::Key_Left)
  7. 		{
  8. 			qpoint.setX(qpoint.x() + 30);
  9. 		}
  10. 		if (event->key() == Qt::Key_Up)
  11. 		{
  12. 			qpoint.setY(qpoint.x() + 30);
  13. 		}
  14. 		if (event->key() == Qt::Key_Down)
  15. 		{
  16. 			qpoint.setX(qpoint.x() - 30);
  17. 		}
  18. 		if (event->key() == Qt::Key_Right)
  19. 		{
  20. 			qpoint.setY(qpoint.x() - 30);
  21. 		}
  22. 		if (event->key() == Qt::Key_Enter || event->key() == Qt::Key_Return)
  23. 		{
  24. 			buttons |= Qt::LeftButton;
  25. 		}
  26. 		QWSMouseHandler::mouseChanged (qpoint,buttons,0);
  27. 		//QWSServer::sendMouseEvent( qpoint, 0 );
  28. 	}
  29. #else
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src/BrowserWindow.cpp:101: error: cannot declare variable 'qwsMouse' to be of abstract type 'QWSMouseHandler'
../../../../install/include/QtGui/qmouse_qws.h:67: note: because the following virtual functions are pure within 'QWSMouseHandler':
../../../../install/include/QtGui/qmouse_qws.h:77: note: virtual void QWSMouseHandler::resume()
../../../../install/include/QtGui/qmouse_qws.h:78: note: virtual void QWSMouseHandler::suspend()
src/BrowserWindow.cpp:127: error: no matching function for call to 'QWSMouseHandler::mouseChanged(QPoint*, Qt::MouseButtons&, int)'
../../../../install/include/QtGui/qmouse_qws.h:81: note: candidates are: void QWSMouseHandler::mouseChanged(const QPoint&, int, int)
make: *** [BrowserWindow.o] Error 1