Problem in Coloring JTabl

  To: comp.lang.java.gui
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>

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