Using JComboBoxes in a JT

  To: comp.lang.java.gui
I am trying to make a list of JComboBoxes. My first try was to put the
JComboBoxes in a JList but my solution did never really work. I
managed to get them in the JList, but I could not interact with the
JComboBoxes.

My current solution for getting a list of JComboBoxes is to put them
in a JTable. As before I manage to get them in there, but they dont
behave as they should. In this solution I can interact with the
JComboBoxes but the problem is that when I select a value from one
JComboBox, then the JComboBoxes that I have not interacted with all
get that value selected in their JComboBoxes too.

In the sample below I have 4 JComboBoxes, here is the code:

import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.DefaultCellEditor;
import javax.swing.JComboBox;
import javax.swing.JTable;
import javax.swing.WindowConstants;
import javax.swing.JFrame;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;

public class NewJPanel extends javax.swing.JPanel {
    public class MyComboBoxRenderer extends JComboBox implements
TableCellRenderer {
        public MyComboBoxRenderer(String[] items) {
            super(items);
        }

        public java.awt.Component getTableCellRendererComponent(JTable
table, Object value,
                boolean isSelected, boolean hasFocus, int row, int
column) {
            if (isSelected) {
                setForeground(table.getSelectionForeground());
                super.setBackground(table.getSelectionBackground());
            } else {
                setForeground(table.getForeground());
                setBackground(table.getBackground());
            }

            // Select the current value
            setSelectedItem(value);
            return this;
        }
    }

    /**
    * Auto-generated main method to display this
    * JPanel inside a new JFrame.
    */
    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.getContentPane().add(new NewJPanel());
        frame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
        frame.pack();
        frame.setVisible(true);
    }

    public NewJPanel() {
        super();
        initGUI();
    }

    private void initGUI() {
        try {
            this.setLayout(new FlowLayout());
            setPreferredSize(new Dimension(400, 300));
            JTable table = new JTable();
            DefaultTableModel model = (DefaultTableModel)table.getModel();

            // Add some columns
            model.addColumn("A");
            model.addRow(new String[]{""});
            model.addRow(new String[]{""});
            model.addRow(new String[]{""});
            model.addRow(new String[]{""});

            // These are the combobox values
            String[] values = new String[]{"item1", "item2", "item3"};

            // Set the combobox editor on the 1st visible column
            int vColIndex = 0;
            TableColumn col = table.getColumnModel().getColumn(vColIndex);
            col.setCellEditor(new DefaultCellEditor(new JComboBox(values)));

            // If the cell should appear like a combobox in its
            // non-editing state, also set the combobox renderer
            col.setCellRenderer(new MyComboBoxRenderer(values));

            add (table);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

Can someone tell me how I could correct my code to make it work?
Or have someone incorporated JComboBoxes in a JList or in a JTable and
feel like sharing the code I would be very happy.

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