JTable Cell Listener

Question

Hello everybody,
i´ve got the following problem: My JTable consists out of 7 columns, column 1 and 2 are editable via Abstract Cell Editor. In column 1 the user can post for example 10:00, in column 2 12:00. In column 3 the difference should automatically be posted. You can call this column "duration". My code so far:
public class GenericCellEditor extends AbstractCellEditor implements TableCellEditor{
     private static final long serialVersionUID = 1L;
     private JTextField mField=new JTextField();
     public GenericCellEditor(final String pTable, String pFunction){
          mField.addFocusListener(new A4LGenericFocusListener(pFunction){
               @Override
               public void focusGained(FocusEvent arg0) {
               @Override
               public void focusLost(FocusEvent arg0) {
                    try {
                         super.getMMethod().invoke(null, new Object[] { pTable });
                    } catch (Exception e){
                         e.printStackTrace();
     @Override
     public Component getTableCellEditorComponent(JTable arg0, Object value,
               boolean arg2, int arg3, int arg4) {
          mField.setText((String) value);
        return mField;
     @Override
     public Object getCellEditorValue() {
          return ((JTextField) mField).getText();
}the method which is called in the focusLost Event:
static public void handleColumn1(String pSource) throws Exception  {
          int  lRow = Table.getTablesSelectedRow(pSource);
          int  lCol = Table.getTablesSelectedCol(pSource);
          A4LTable.setTableValueAt(pSource, lRow, lCol, "bla");
     }     and the function:
static public void addCellListener(String pTableHandle, int pColumn, String pFunction) throws Exception{
         if (!sContainer.getMMap().containsKey(pTableHandle)) {
            throw new Exception("Handler-Error: "  +pTableHandle+
" is refers not a Table");
        } else if (!(sContainer.getMMap().get(pTableHandle).getMObject() instanceof JTable)) {
            throw new Exception("Handler-Error: "  +pTableHandle+
" is refers not a Table");
        } else {
             JTable lTable=(JTable)sContainer.getMMap().get(pTableHandle).getMObject();
             lTable.getColumnModel().getColumn(pColumn).setCellEditor(new A4LGenericCellEditor(pTableHandle, pFunction));
    }As you can see, i´m adding a CellListener to the specified pColumn. This works fine so far. My problem begins now: the user edits the cell in column1 and row1. If he skips via tab to the next cell, the handleColumn1 function is called. But now Table.getTablesSelectedCol contains the wrong column, cause the user skipped to stop editing. How can I prevent this from happening? Table.getTablesSelectedCol needs to provide the cell of the focusEvent and not the cell which is selected via user tab. I hope i made my problem clear.
One more thing: Is there any chance realising my table without a AbstractTextEditor? Just adding a special CellListener to a specified column and cell of the table. If the user edits the specified cell, another cell will be edited automatically with a duration (in my case). Thank you for your help.
Best regards
StefanTmp

Answer 1

You could just add a TableModelListener and update the value in column 3 whenever column 1 or 2 is updated. It might be even easier with a custom (Default/Abstract)TableModel and override setValueAt() to update the value in column 3 when necessary.
@Override
public void setValueAt(int row, int column, Object value) {
  super.setValueA(row, column, value);
  if(column == 1 || column == 2) {
    super.setValueAt(row, 3, calculateDuration(
      getValueAt(row, 1), getValueAt(row, 2));
}