Reordering Column

[Mathews P Srampikal]

I have a table with columns.I don't want to give
head.setReorderingAllowed(false);
At the same time if the user swap the column the column 0 become 1 and 1 become 0.What to do to prevent this.I mean it should be in the way it created first.

[Eddie Vanda]

Hi Matthews
If you are not using a table model, then you could use the getColumnIndex (column name) on the table to get the new index of the column and then use that number to reference the column.
Much easier is to have a table model (say, DefaultTableModel), as its columns do not change when the table's columns change.
Ed

[Mathews P Srampikal]

Yes.I have a table Model extending Abstract Table Model.Still it is Changing.

[Eddie Vanda]

import javax.swing.*;
import javax.swing.table.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;

public class TableColumnOrderTest extends JFrame implements MouseListener {
  String headers [] = {"h0", "h1"};
  String data [][] = {{"a0", "b0"}, {"a1", "b1"}};
  JTextArea ta1 = new JTextArea (30,5);
  DefaultTableModel dtm = null;
  JTable jt = null;
  TableColumnOrderTest () {
    Container c = getContentPane ();
    dtm = new DefaultTableModel (data, headers);
    jt = new JTable (dtm);
    jt.setAutoResizeMode (JTable.AUTO_RESIZE_OFF);
    JScrollPane jsp2 = new JScrollPane (jt);
    c.add (jsp2, BorderLayout.CENTER);
    JScrollPane jsp1 = new JScrollPane (ta1);
    c.add (jsp1, BorderLayout.SOUTH);
    jt.addMouseListener (this);
    setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE );
    pack ();
    setVisible (true);
  }

  public void mousePressed (MouseEvent e) {
    String z = "mousePressed ";
    Point p = e.getPoint ();
    int r = jt.rowAtPoint (p);
    int c = jt.columnAtPoint (p);
    try {
        mes(z + "c=" + c + ",r=" + r
            + "  jt value=" + (String) jt.getValueAt (r, c)
            + "  dtm value=" + (String) dtm.getValueAt (r, c));
    } catch (Exception e1) {
      mes (z + "c=" + c + ",r=" + r + e1.toString ());
    }
  }
  public void mouseExited (MouseEvent e) {}
  public void mouseEntered (MouseEvent e) {}
  public void mouseClicked (MouseEvent e) {}
  public void mouseReleased (MouseEvent e) {}
  void mes (String s) {
    ta1.append (s + "\n");
  }
  public static void main (String [] args) {
     new TableColumnOrderTest ();
   }
}

This little example uses DefaultTableModel which takes care of the data storage.
mousePressed c=0,r=0 jt value=a0 dtm value=a0
swapped columns
mousePressed c=0,r=0 jt value=b0 dtm value=a0
mousePressed c=1,r=1 jt value=a1 dtm value=b1
So it's ok depending on where you get your cell value from. Not sure if that's helpful but I am interested in exploring this further. I think there is another call that will correct the table column.