JTable + KeyPress?

[wangdong]

How do I know the current row number when up/down key is pressed?

I try to add a KeyListener, but it doesen't do the job.

jTable.addKeyListener(new java.awt.event.KeyAdapter() {
public void keyPressed(java.awt.event.KeyEvent e) {
int row = jTable.getSelectedRow();
....
....
}
}

Chinese Java Faq Forum

http://www.4ugo.com/bbs/index.asp

 

[Diancecht]

Maybe some more details can help.

Cheers,
Dian

 

[wangdong]

I have a table with serveral text fields on a frame. When a user clicks on a table row, the fields values are displayed in the text fields. However, when the user uses up/down keys to switch between the rows, the text fields value are not updated. Therefore, I added a KeyListener to the table and try to get the selected row number. For some reason, this couldn't resolve my problem. Someone's got any idea?

Chinese Java Faq Forum

http://www.4ugo.com/bbs/index.asp

 

[MicroSnigel]

You should try ListSelectionListener. It never fails keeping track of all changes. This codeexample (not tested) should constantly keep currentRow up-to-date with current row in the table.

JTable myTable = new JTable();
ListSelectionModel lsm;
int currentRow = -1;
int prevRow = -1;

public myConstructor()
{
  lsm = myTable.getSelectionModel();
  lsm.addListSelectionListener(
    new ListSelectionListener() {
      public void valueChanged(ListSelectionEvent e) {
        if (e.getValueIsAdjusting()) return; // ignore
        ListSelectionModel lsm2 = (ListSelectionModel)e.getSource();
        if (!lsm2.isSelectionEmpty()) {
          prevRow = currentRow;
          currentRow = lsm2.getMinSelectionIndex();
        }     
      }
    }
  );
}