Setting viewport in jtable

Question

Hello i have a jtable with many rows in a jscrollpane. After calling the
J
JTable table = new JTable();
table.addMouseListener(new ColumnHeaderListener( this ));
JScrollPane scrollPane = new JScrollPane( table );
scrollPane.add(table);
scrollPane.getViewport().addChangeListener(this);When the user clicks on the table there are some actions and i have to repaint the table therefore I added a MouseListener.
public class ColumnHeaderListener extends MouseAdapter
@Override
     public void mouseReleased(MouseEvent e)
          JTable table = this.tv.getTable();
          AssignmentsTableModel atm = (AssignmentsTableModel)table.getModel();
                atm.fireTableDataChanged();
                scrollToVisible(table, row, 0);
{After calling fireTableDataChanged() the JTable always scrolls back to the first row. I tried fireTableCellUpdated() but it doesn't work.
public void scrollToVisible(JTable table, int rowIndex, int vColIndex)
          if (!(table.getParent() instanceof JViewport))
               return;
          JViewport viewport = (JViewport)table.getParent();
          if(rowIndex == 0)
               return;
          Rectangle rect = table.getCellRect(rowIndex, vColIndex, true);
          Point pt = viewport.getViewPosition();
          int newx = rect.x-pt.x;
          int newy = rect.y-pt.y;
          rect.setLocation(newx, newy);
          viewport.scrollRectToVisible(rect);
     }But the viewport does not move. I tried setting newx and newy with variable values but the table always jumps back to row 1.
Kind regards,
Chang

Answer 1

JScrollPane scrollPane = new JScrollPane( table );
//scrollPane.add(table); // this is wrongYou never add a component directly to the scrollpane. You either
a) create the scroll pane with the component as a parameter (as you did correctly)
b) set the view of the viewport with your component
JTable table = this.tv.getTable();
AssignmentsTableModel atm = (AssignmentsTableModel)table.getModel();
atm.fireTableDataChanged();
scrollToVisible(table, row, 0); This code makes no sense.
a) The variable row doesn't have a value.
b) Why would clicking on the table header cause you to invoke "fireTableDataChanged"? You haven't changed any of the data.
viewport.scrollRectToVisible(rect);I always invoke the scrollRectToVisible(... ) method on the component added to the scrollpane (ie. the table).
For more help create a [url http://sscce.org]SSCCE, that demonstrates the incorrect behaviour.