Keeping Viewport position when rows above viewport are deleted from JTable?

Question

I have a JTable backed by a vector. I have, say, 30 rows and my Viewport is showing the ten rows from row 11 to 20. I want to be able to delete one of the first 10 rows without having my viewport slide so that it displays what were formerly rows 12-21. Essentially, I want the position of the viewport anchored to the rows shown in the viewport, not anchored to the row numbers position in the table. I have been able to do this by moving the viewport Rectangle by getRowHeight with each delete but that makes my table flicker when rows are deleted and is generally an ugly solution. The table is sorted so that the rows are not necessarily displayed in the order in which they reside in the vector.
Here is the ugly way to accomplish what I'm talking about:
JViewport viewport = null;
java.awt.Point p = null;
// if the order is being removed from above the current viewport
// scroll down one row so the viewport remains stationary during deletes.
if (table != null && (table.getParent() instanceof JViewport)) {
     viewport = (JViewport) table.getParent();
     int h = table.getRowHeight();
     Rectangle rect = table.getCellRect(row, 0, true);
     p = viewport.getViewPosition();
     //if the row being deleted is above the viewport
     if (rect.getY() + h < p.getY()) {
          // The location of the view relative to the table
          // Scroll the area into view.
          h = h * -1;
          p.translate(0, h);
          viewport.setViewPosition(p);
displayedVector.remove(row);
fireTableRowsDeleted(row, row);
Thanks!
Andrew Munn
[email protected]

Answer 1

What am I doing wrong?Nothing.
The DataModel stores data. The ColumnModel is used by the table to display the data from the DataModel in a certain order. If you don't want to display a column that fine, but there is no need to delete the data.
If you want to delete data from the DataModel the look at the DefaultTableModel API setColumnCount(int) method.