Hi All,

I have a JTable in which one cell has a JComboBox as cell editor. If a
particular value is chosen in the JComboBox, some other cells in the
JTable should become editable.And i need to show the editable cells in
a different color. My problem is that, though cells are becoming
editable according to the condition, color of those cells are changing
only if click them. I want color to change when selection is made in
the JComboBox. Please find sample program, and give some suggentions.

Thanks in advance

Chanchal

<code>
import java.awt.*;
import java.util.List;
import java.util.ArrayList;
import javax.swing.*;
import javax.swing.table.*;

public class JTableTest extends JFrame {

   public JTableTest() {
       jScrollPane1 = new JScrollPane();
       jTable1 = new JTable();
       jTable1.setRowSelectionAllowed(false);

       TestModel testModel = new TestModel();
       testModel.setDataVector(new Object [][] {{"1", "2"},{"3",
"4"},},
               new String [] {"Title 1", "Title 2"});
       jTable1.setModel(testModel);
       JComboBox jcb = new JComboBox(new DefaultComboBoxModel(new
Object[]{"1","2"}));
       jTable1.getColumn(jTable1.getColumnName(0)).setCellEditor(new
DefaultCellEditor(jcb));

jTable1.getColumn(jTable1.getColumnName(0)).setCellRenderer(new
TestRenderer());

jTable1.getColumn(jTable1.getColumnName(1)).setCellRenderer(new
TestRenderer());

       jScrollPane1.setViewportView(jTable1);

       getContentPane().add(jScrollPane1, BorderLayout.CENTER);

       pack();

   }

   public static void main(String args[]) {
       java.awt.EventQueue.invokeLater(new Runnable() {
           public void run() {
               new JTableTest().setVisible(true);
           }
       });
   }

   private JScrollPane jScrollPane1;
   private JTable jTable1;

   //inner class for TableModel
   class TestModel extends DefaultTableModel{

       List<Integer> nonEditableColumns;

       public TestModel(){
           nonEditableColumns = new ArrayList<Integer>();
           nonEditableColumns.add(1);
       }

       public void setDataVector(Object[][] data, Object[] headers) {
           super.setDataVector(data, headers);
       }

       public boolean isCellEditable(int row, int column) {
           if(nonEditableColumns.contains(column)){
               return false;
           }else {
               return true;
           }
       }

       public void setValueAt(Object value, int row, int column) {
           if(column == 0){
               int val = Integer.parseInt(String.valueOf(value));
               if(val == 2){
                   nonEditableColumns.remove(new Integer(1));
               }else{
                   nonEditableColumns.add(new Integer(1));
               }
           }
           fireTableCellUpdated(row, column);
       }
   }

   //inner class for renderer
   class TestRenderer extends DefaultTableCellRenderer{
       public Component getTableCellRendererComponent(JTable jTable,
Object value, boolean selected, boolean hasFocus, int row, int column)
{
           TableModel tModel = jTable.getModel();
           setOpaque(true);
           if(tModel.isCellEditable(row, column)){
               setBackground(Color.MAGENTA);
           }else{
               setBackground(Color.CYAN);
           }
           setForeground( Color.BLACK );

setText(String.valueOf(jTable.getModel().getValueAt(row,column)));
           return this;
       }
   }
}
</code>