how to add the comobox in the header of the QTableWidget;,and how to control the TableWidget's rows and columns just by click the scroll button at the both side of the scroll bar.
i use the the wheel event to add rows ,but i can't find how to know the wheel's direction


Qt Code: 
  1. void DataEditor::wheelEvent(QWheelEvent *e)
  2. {
  3.  
  4.  
  5.  
  6.  
  7. 	if (table->verticalScrollBar()->value()==table->verticalScrollBar()->maximum())
  8. 	{
  9. 		int count=table->rowCount()+1;
  10. 		table->setRowCount(count);
  11. 	}
  12. 	if (table->verticalScrollBar()->value()==table->verticalScrollBar()->minimum())
  13. 	{
  14.  
  15. 		if ((table->verticalScrollBar()->value())>20)
  16. 		{	int count=table->rowCount()-1;
  17. 		table->setRowCount(count);			
  18. 		}
  19.  
  20.  
  21. 	}
  22. }
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