rednight

public class GroupableHeaderExample extends JFrame {

? GroupableHeaderExample() {
??? super( "Groupable Header Example" );

??? DefaultTableModel dm = new DefaultTableModel();
??? dm.setDataVector(new Object[][]{
????? {"119","foo","bar","ja","ko","zh"},
????? {"911","bar","foo","en","fr","pt"}},
??? new Object[]{"SNo.","1","2","Native","2","3"});

??? JTable table = new JTable( dm ) {
????? protected JTableHeader createDefaultTableHeader() {
? return new GroupableTableHeader(columnModel);
????? }
??? };
??? TableColumnModel cm = table.getColumnModel();
??? ColumnGroup g_name = new ColumnGroup("Name");
??? g_name.add(cm.getColumn(1));
??? g_name.add(cm.getColumn(2));
??? ColumnGroup g_lang = new ColumnGroup("Language");
??? g_lang.add(cm.getColumn(3));
??? ColumnGroup g_other = new ColumnGroup("Others");
??? g_other.add(cm.getColumn(4));
??? g_other.add(cm.getColumn(5));
??? g_lang.add(g_other);
??? GroupableTableHeader header = (GroupableTableHeader)table.getTableHeader();
??? header.addColumnGroup(g_name);
??? header.addColumnGroup(g_lang);

??? TableCellRenderer renderer =? new DefaultTableCellRenderer() {
??????? public Component getTableCellRendererComponent(JTable table, Object value,
???????????????????????? boolean isSelected, boolean hasFocus, int row, int column) {
????????? JTableHeader header = table.getTableHeader();
????????? if (header != null) {
??????????? setForeground(header.getForeground());
??????????? setBackground(header.getBackground());
??????????? setFont(header.getFont());
????????? }
????????? setHorizontalAlignment(JLabel.CENTER);
????????? setText((value == null) ? "" : value.toString());
????????? setBorder(UIManager.getBorder("TableHeader.cellBorder"));
????????? return this;
??????? }
????? };

??? TableColumnModel model = table.getColumnModel();
??? for (int i=0;i<model.getColumnCount();i++) {
????? model.getColumn(i).setHeaderRenderer(renderer);
??? }
??? JScrollPane scroll = new JScrollPane( table );
??? getContentPane().add( scroll );
??? setSize( 400, 120 );
? }

? public static void main(String[] args) {
??? GroupableHeaderExample frame = new GroupableHeaderExample();
??? frame.addWindowListener( new WindowAdapter() {
????? public void windowClosing( WindowEvent e ) {
? System.exit(0);
????? }
??? });
??? frame.setVisible(true);
? }
}

=============================================
public void paint(Graphics g, JComponent c) {
??? Rectangle clipBounds = g.getClipBounds();
??? if (header.getColumnModel() == null) return;
//??? ((GroupableTableHeader)header).setColumnMargin();
??? int column = 0;
??? Dimension size = header.getSize();
??? Rectangle cellRect? = new Rectangle(0, 0, size.width, size.height);
??? Hashtable h = new Hashtable();
//??? int columnMargin = header.getColumnModel().getColumnMargin();

??? Enumeration enumeration = header.getColumnModel().getColumns();
??? while (enumeration.hasMoreElements()) {
????? cellRect.height = size.height;
????? cellRect.y????? = 0;
????? TableColumn aColumn = (TableColumn)enumeration.nextElement();
????? Enumeration cGroups = ((GroupableTableHeader)header).getColumnGroups(aColumn);
????? if (cGroups != null) {
??????? int groupHeight = 0;
??????? while (cGroups.hasMoreElements()) {
????????? ColumnGroup cGroup = (ColumnGroup)cGroups.nextElement();
????????? Rectangle groupRect = (Rectangle)h.get(cGroup);
????????? if (groupRect == null) {
??????????? groupRect = new Rectangle(cellRect);
??????????? Dimension d = cGroup.getSize(header.getTable());
??????????? groupRect.width? = d.width;
??????????? groupRect.height = d.height;
??????????? h.put(cGroup, groupRect);
????????? }
????????? paintCell(g, groupRect, cGroup);
????????? groupHeight += groupRect.height;
????????? cellRect.height = size.height - groupHeight;
????????? cellRect.y????? = groupHeight;
??????? }
????? }
????? cellRect.width = aColumn.getWidth() ;//+ columnMargin;
????? if (cellRect.intersects(clipBounds)) {
??????? paintCell(g, cellRect, column);
????? }
????? cellRect.x += cellRect.width;
????? column++;
??? }
? }