JList TableCellEditor in JTable

Question

phew......I'm unable to resolve this.
I 'm trying to create a custom TableCellEditor which is of the type JList .
This is the main class which calls the ListEditor and the ListRenderer
import javax.swing.DefaultCellEditor;
import javax.swing.JComboBox;
import javax.swing.JTextField;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.GridLayout;
public class TableDemo2 extends JPanel {
    private boolean DEBUG = false;
    public TableDemo2() {
         super(new GridLayout(1,0));
         JTable table = new JTable(new MyTableModel());
         table.setPreferredScrollableViewportSize(new Dimension(500, 70));
         JScrollPane scrollPane = new JScrollPane(table);
         initColumnSizes(table);
         setUpSportColumn(table, table.getColumnModel().getColumn(2));
         add(scrollPane);
    private void initColumnSizes(JTable table) {
         MyTableModel model = (MyTableModel)table.getModel();
         TableColumn column = null;
         Component comp = null;
         int headerWidth = 0;
         int cellWidth = 0;
         Object[] longValues = model.longValues;
         TableCellRenderer headerRenderer = table.getTableHeader().getDefaultRenderer();
         for (int i = 0; i < 3; i++) {
         column = table.getColumnModel().getColumn(i);
         comp = headerRenderer.getTableCellRendererComponent( null, column.getHeaderValue(), false, false, 0, 0);
         headerWidth = comp.getPreferredSize().width;
         comp = table.getDefaultRenderer(model.getColumnClass(i)). getTableCellRendererComponent( table, longValues, false, false, 0, i);
     cellWidth = comp.getPreferredSize().width;
     if (DEBUG) {
     System.out.println("Initializing width of column " + i + ". " + "headerWidth = " + headerWidth + "; cellWidth = " + cellWidth);
     column.setPreferredWidth(Math.max(headerWidth, cellWidth));
public void setUpSportColumn(JTable table, TableColumn sportColumn) {
     sportColumn.setCellRenderer(new ListRenderer());
sportColumn.setCellEditor(new ListEditor());
class MyTableModel extends AbstractTableModel {
     private String[] columnNames = {"Functions", "Parameters", "Values"};
     private Object[][] data = { {"DiscoveryCallBackFunction", "nodeName", "devDetail"} };
     public int getColumnCount() {
               return columnNames.length;
public int getRowCount() {
     return data.length;
public String getColumnName(int col) {
     return columnNames[col];
public Object getValueAt(int row, int col) {
     return data[row][col];
public Class getColumnClass(int c) {
     return getValueAt(0, c).getClass();
public boolean isCellEditable(int row, int col) {
     if (col < 2) {
     return false;
else {
return true;
public void setValueAt(Object value, int row, int col) {
     if (DEBUG) {
System.out.println("Setting value at " + row + "," + col + " to " + value + " (an instance of " + value.getClass() + ")");
     data[row][col] = value; fireTableCellUpdated(row, col);
     if (DEBUG) {
     System.out.println("New value of data:");
     printDebugData();
private void printDebugData() {
     int numRows = getRowCount();
     int numCols = getColumnCount();
     for (int i=0; i < numRows; i++) {
     System.out.print(" row " + i + ":");
     for (int j=0; j < numCols; j++) {
          System.out.print(" " + data[i][j]);
     System.out.println();
     } System.out.println("--------------------------");
private static void createAndShowGUI() {
JFrame.setDefaultLookAndFeelDecorated(true);
JFrame frame = new JFrame("TableDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
TableDemo1 newContentPane = new TableDemo2();
newContentPane.setOpaque(true);
frame.setContentPane(newContentPane);
frame.pack();
frame.setVisible(true);
public static void main(String[] args) {
     javax.swing.SwingUtilities.invokeLater(new Runnable() {
     public void run() { createAndShowGUI();
ListEditor.java
import java.awt.event.*;
import java.awt.*;
import java.util.List;
import java.util.*;
import javax.swing.table.*;
import javax.swing.*;
public class ListEditor extends AbstractCellEditor  implements TableCellEditor, ActionListener{
   private JList list;
   private JScrollPane ps;
   private WorkflowGraphModel graphModel;
   private WorkflowGraph graph;
   private DefaultListModel listModel;
   public void prepareList() {
      listModel = new DefaultListModel();
      list = new JList(listModel);
      list.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
       listModel.addElement("Item1");
       listModel.addElement("Item2");
       listModel.addElement("Item3");
       listModel.addElement("Item4");
       listModel.addElement("Item5");
      ps = new JScrollPane();
      ps.getViewport().add(list);
   public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int rowIndex, int vColIndex) {
     return ps;
   public Object getCellEditorValue() {
      return list.getSelectedValue();
    public void actionPerformed(ActionEvent event) {
ListRenderer - I used frm one of the forums , but that didn't seem to work eitherpublic class ListRenderer extends JList implements TableCellRenderer {
public ListRenderer() {
super();
setBorder(new EmptyBorder(8, 12, 8, 12));
D.ebug("fixed height: " + getFixedCellHeight());
setCellRenderer(createCellRenderer());
public Component getTableCellRendererComponent(JTable table, Object value,
boolean selected, boolean hasFocus, int row, int col) {
if (value instanceof ListModel) {
setModel((ListModel) value);
} else {
Object[] data = new Object[1];
data[0] = value;
setListData(data);
setFont(table.getFont().deriveFont(14.0f));
return this;
public ListCellRenderer createCellRenderer() {
return new DefaultListCellRenderer() {
public Component getListCellRendererComponent(JList list, Object value,
int index, boolean selected, boolean hasFocus) {
super.getListCellRendererComponent(list, value, index, selected, hasFocus);
setBorder(null);
setHorizontalAlignment(SwingConstants.RIGHT);
return this;
appreciate the help
thnx

Answer 1

I am happy to help you. below is the modified code:
import javax.swing.DefaultCellEditor;
import javax.swing.JComboBox;
import javax.swing.JTextField;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.*;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;
import java.awt.*;
import java.util.*;
import java.awt.GridLayout;
public class TableDemo2 extends JPanel {
private boolean DEBUG = false;
public TableDemo2() {
     super(new GridLayout(1,0));
     JTable table = new JTable(new MyTableModel());
     table.setPreferredScrollableViewportSize(new Dimension(500, 70));
     JScrollPane scrollPane = new JScrollPane(table);
     initColumnSizes(table);
     setUpSportColumn(table, table.getColumnModel().getColumn(2));
     add(scrollPane);
private void initColumnSizes(JTable table) {
     MyTableModel model = (MyTableModel)table.getModel();
     TableColumn column = null;
     Component comp = null;
     int headerWidth = 0;
     int cellWidth = 0;
     //?! Object[] longValues = model.longValues;
     TableCellRenderer headerRenderer = table.getTableHeader().getDefaultRenderer();
     for (int i = 0; i < 3; i++) {
     column = table.getColumnModel().getColumn(i);
// comp = headerRenderer.getTableCellRendererComponent( null, column.getHeaderValue(), false, false, 0, 0);
comp = headerRenderer.getTableCellRendererComponent( null, column.getHeaderValue(), true, true, 0, 0);
headerWidth = comp.getPreferredSize().width;
     //need ?no!!!!!!? comp = table.getDefaultRenderer(model.getColumnClass(i)). getTableCellRendererComponent( table, longValues, false, false, 0, i);
     cellWidth = comp.getPreferredSize().width;
     if (DEBUG) {
     System.out.println("Initializing width of column " + i + ". " + "headerWidth = " + headerWidth + "; cellWidth = " + cellWidth);
     column.setPreferredWidth(Math.max(headerWidth, cellWidth));
public void setUpSportColumn(JTable table, TableColumn sportColumn) {
     sportColumn.setCellRenderer(new ListRenderer());
sportColumn.setCellEditor(new ListEditor());
class MyTableModel extends AbstractTableModel {
     private String[] columnNames = {"Functions", "Parameters", "Values"};
     private Object[][] data = { {"DiscoveryCallBackFunction", "nodeName", "devDetail"} };
     public int getColumnCount() {
               return columnNames.length;
public int getRowCount() {
     return data.length;
public String getColumnName(int col) {
     return columnNames[col];
public Object getValueAt(int row, int col) {
     return data[row][col];
public Class getColumnClass(int c) {
     return getValueAt(0, c).getClass();
public boolean isCellEditable(int row, int col) {
     if (col < 2) {
     return false;
else {
return true;
public void setValueAt(Object value, int row, int col) {
     if (DEBUG) {
System.out.println("Setting value at " + row + "," + col + " to " + value + " (an instance of " + value.getClass() + ")");
     data[row][col] = value; fireTableCellUpdated(row, col);
     if (DEBUG) {
     System.out.println("New value of data:");
     printDebugData();
private void printDebugData() {
     int numRows = getRowCount();
     int numCols = getColumnCount();
     for (int i=0; i < numRows; i++) {
     System.out.print(" row " + i + ":");
     for (int j=0; j < numCols; j++) {
          System.out.print(" " + data[i][j]);
     System.out.println();
     } System.out.println("--------------------------");
private static void createAndShowGUI() {
JFrame.setDefaultLookAndFeelDecorated(true);
JFrame frame = new JFrame("TableDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
TableDemo2 newContentPane = new TableDemo2();
newContentPane.setOpaque(true);
frame.setContentPane(newContentPane);
frame.pack();
frame.setVisible(true);
public static void main(String[] args) {
     javax.swing.SwingUtilities.invokeLater(new Runnable() {
     public void run() { createAndShowGUI();
//ActionListener?u r not using actionListener!.
//class ListEditor extends AbstractCellEditor implements TableCellEditor, ActionListener{
class ListEditor extends JScrollPane implements TableCellEditor, ActionListener{
private JList list;
private JScrollPane ps;
//???????? private WorkflowGraphModel graphModel;
//???????? private WorkflowGraph graph;
private DefaultListModel listModel;
public ListEditor(){
super();
// super(new String[]{"one", "two", "three", "four"});
listModel = new DefaultListModel();
list = new JList(listModel);
listModel.addElement("Item1");
listModel.addElement("Item2");
listModel.addElement("Item3");
listModel.addElement("Item4");
listModel.addElement("Item5");
listModel.addElement("Item4");
listModel.addElement("Item5");
this.getViewport().setView(list);
public void prepareList() {
list = new JList(listModel);
list.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
listModel.addElement("Item1");
listModel.addElement("Item2");
listModel.addElement("Item3");
listModel.addElement("Item4");
listModel.addElement("Item5");
ps = new JScrollPane();
ps.getViewport().add(list);
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int rowIndex, int vColIndex) {
System.out.println("inside editor");
return this;
// return ps;
public Object getCellEditorValue() {
return list.getSelectedValue();
public boolean isCellEditable(EventObject ee) { return true; }
public boolean shouldSelectCell(EventObject eee) { return true; }
public boolean stopCellEditing() {return true; }
public void cancelCellEditing() { }
public void addCellEditorListener(CellEditorListener l) { }
public void removeCellEditorListener(CellEditorListener ll) { }
public void actionPerformed(ActionEvent event) {
//ListRenderer - I used frm one of the forums , but that didn't seem to work either
class ListRenderer extends JList implements TableCellRenderer {
public ListRenderer() {
super();
//*************This is the problem boy!: setBorder(new EmptyBorder(8, 12, 8, 12));
//???? DEBUG("fixed height: " + getFixedCellHeight());
//???noooooooo!!!! setCellRenderer(createCellRenderer());
public Component getTableCellRendererComponent(JTable table, Object value,
boolean selected, boolean hasFocus, int row, int col) {
if (value instanceof ListModel) {
setModel((ListModel) value);
} else {
Object[] data = new Object[1];
data[0] = value;
setListData(data);
//this size is big to fit inside the current row size!.** setFont(table.getFont().deriveFont(14.0f));
return this;
public ListCellRenderer createCellRenderer() {
return new DefaultListCellRenderer() {
public Component getListCellRendererComponent(JList list, Object value,
int index, boolean selected, boolean hasFocus) {
super.getListCellRendererComponent(list, value, index, selected, hasFocus);
setBorder(null);
setHorizontalAlignment(SwingConstants.RIGHT);
return this;
if u hav more problem plz post. u r welcome.
by pravinth.G(searching job);