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Need help with JTable header group :
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: javax.swing.table.JTableHeader cannot be cast to id.co.aal.common.GroupableTableHeader

this is the part of table drawing

.....
if(tabledraw)
        {

            tabledraw=false;
        for (int k = 0; k < m_data.getColumnCount(); k++) {

        TableCellRenderer renderer;
        if (k==Kehadirantable.COL_ALOKASI)
            renderer = new CheckCellRenderer();
        else {
            DefaultTableCellRenderer textRenderer = 
            new DefaultTableCellRenderer();
            renderer = textRenderer;
        }

        TableCellEditor editor;
        final TableCellEditor comm = null;
        JComboBox cmb=new JComboBox(CATEGORIES); 
        if (k==Kehadirantable.COL_KODE)
        {
            editor = new DefaultCellEditor(cmb);

        }   
        else if (k==Kehadirantable.COL_ALOKASI)
            editor = new DefaultCellEditor(new JCheckBox());
        else
            editor = new DefaultCellEditor(new JTextField());
            TableColumn column = new TableColumn(k,m_data.m_columns[k].m_width,renderer, editor);
            tblKehadiran.addColumn(column);   
        tblKehadiran.getColumnModel().getColumn(k).setResizable(false);
        }
        TableColumnModel cm = tblKehadiran.getColumnModel();
        ColumnGroup g_2nd = new ColumnGroup("ALOKASI");
        g_2nd.add(cm.getColumn(6));
        g_2nd.add(cm.getColumn(7));
        GroupableTableHeader header = (GroupableTableHeader)tblKehadiran.getTableHeader();
        header.addColumnGroup(g_2nd);
        header.revalidate(); 
        }

here the class i use :

//ColumnGroup

public class ColumnGroup {
protected TableCellRenderer renderer;
  protected Vector v;
  protected String text;
  protected int margin=0;

  public ColumnGroup(String text) {
    this(null,text);
  }

  public ColumnGroup(TableCellRenderer renderer,String text) {
    if (renderer == null) {
      this.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;
        }
      };
    } else {
      this.renderer = renderer;
    }
    this.text = text;
    v = new Vector();
  }


  /**
   * @param obj    TableColumn or ColumnGroup
   */
  public void add(Object obj) {
    if (obj == null) { return; }
    v.addElement(obj);
  }


  /**
   * @param c    TableColumn
   * @param v    ColumnGroups
   */
  public Vector getColumnGroups(TableColumn c, Vector g) {
    g.addElement(this);
    if (v.contains(c)) return g;    
    Enumeration e = v.elements();
    while (e.hasMoreElements()) {
      Object obj = e.nextElement();
      if (obj instanceof ColumnGroup) {
        Vector groups = 
          (Vector)((ColumnGroup)obj).getColumnGroups(c,(Vector)g.clone());
        if (groups != null) return groups;
      }
    }
    return null;
  }

  public TableCellRenderer getHeaderRenderer() {
    return renderer;
  }

  public void setHeaderRenderer(TableCellRenderer renderer) {
    if (renderer != null) {
      this.renderer = renderer;
    }
  }

   public Object getHeaderValue() {
    return text;
  }

//GroupableTableHeader

public class GroupableTableHeader extends JTableHeader  {
 private static final String uiClassID = "GroupableTableHeaderUI";
  protected Vector columnGroups = null;

  public GroupableTableHeader(TableColumnModel model) {
    super(model);
    setUI(new GroupableTableHeaderUI());
    setReorderingAllowed(false);
  }
  public void updateUI(){
   setUI(new GroupableTableHeaderUI());
  }

  public void setReorderingAllowed(boolean b) {
    reorderingAllowed = false;
  }

  public void addColumnGroup(ColumnGroup g) {
    if (columnGroups == null) {
      columnGroups = new Vector();
    }
    columnGroups.addElement(g);
  }

  public Enumeration getColumnGroups(TableColumn col) {
    if (columnGroups == null) return null;
    Enumeration e = columnGroups.elements();
    while (e.hasMoreElements()) {
      ColumnGroup cGroup = (ColumnGroup)e.nextElement();
      Vector v_ret = (Vector)cGroup.getColumnGroups(col,new Vector());
      if (v_ret != null) { 
  return v_ret.elements();
      }
    }
    return null;
  }

  public void setColumnMargin() {
    if (columnGroups == null) return;
    int columnMargin = getColumnModel().getColumnMargin();
    Enumeration e = columnGroups.elements();
    while (e.hasMoreElements()) {
      ColumnGroup cGroup = (ColumnGroup)e.nextElement();
      cGroup.setColumnMargin(columnMargin);
    }
  }

}


  public Dimension getSize(JTable table) {
    Component comp = renderer.getTableCellRendererComponent(
        table, getHeaderValue(), false, false,-1, -1);
    int height = comp.getPreferredSize().height; 
    int width  = 0;
    Enumeration e = v.elements();
    while (e.hasMoreElements()) {
      Object obj = e.nextElement();
      if (obj instanceof TableColumn) {
        TableColumn aColumn = (TableColumn)obj;
        width += aColumn.getWidth();
        width += margin;
      } else {
        width += ((ColumnGroup)obj).getSize(table).width;
      }
    }
    return new Dimension(width, height);
  }

  public void setColumnMargin(int margin) {
    this.margin = margin;
    Enumeration e = v.elements();
    while (e.hasMoreElements()) {
      Object obj = e.nextElement();
      if (obj instanceof ColumnGroup) {
        ((ColumnGroup)obj).setColumnMargin(margin);
      }
    }
  }


}
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Last Post by Lius
0

and this
//GroupableTableHeaderUI

public class GroupableTableHeaderUI extends BasicTableHeaderUI {

  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++;
    }
  }

  private void paintCell(Graphics g, Rectangle cellRect, int columnIndex) {
    TableColumn aColumn = header.getColumnModel().getColumn(columnIndex);
    TableCellRenderer renderer = aColumn.getHeaderRenderer();
    //revised by Java2s.com
    renderer = new DefaultTableCellRenderer(){
        public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
          JLabel header = new JLabel();
            header.setForeground(table.getTableHeader().getForeground());
            header.setBackground(table.getTableHeader().getBackground());
            header.setFont(table.getTableHeader().getFont());

          header.setHorizontalAlignment(JLabel.CENTER);
          header.setText(value.toString());
          header.setBorder(UIManager.getBorder("TableHeader.cellBorder"));
            return header;
        }

    };
    Component c = renderer.getTableCellRendererComponent(
        header.getTable(), aColumn.getHeaderValue(),false, false, -1, columnIndex);

    rendererPane.add(c);
    rendererPane.paintComponent(g, c, header, cellRect.x, cellRect.y,
        cellRect.width, cellRect.height, true);
  }

  private void paintCell(Graphics g, Rectangle cellRect,ColumnGroup cGroup) {
    TableCellRenderer renderer = cGroup.getHeaderRenderer();
      //revised by Java2s.com
     // if(renderer == null){
//      return ;
  //    }

    Component component = renderer.getTableCellRendererComponent(
      header.getTable(), cGroup.getHeaderValue(),false, false, -1, -1);
    rendererPane.add(component);
    rendererPane.paintComponent(g, component, header, cellRect.x, cellRect.y,
        cellRect.width, cellRect.height, true);
  }

  private int getHeaderHeight() {
    int height = 0;
    TableColumnModel columnModel = header.getColumnModel();
    for(int column = 0; column < columnModel.getColumnCount(); column++) {
      TableColumn aColumn = columnModel.getColumn(column);
      TableCellRenderer renderer = aColumn.getHeaderRenderer();
      //revised by Java2s.com
      if(renderer == null){
      return 16;
      }

      Component comp = renderer.getTableCellRendererComponent(
        header.getTable(), aColumn.getHeaderValue(), false, false,-1, column);
      int cHeight = comp.getPreferredSize().height;
      Enumeration e = ((GroupableTableHeader)header).getColumnGroups(aColumn);      
      if (e != null) {
        while (e.hasMoreElements()) {
          ColumnGroup cGroup = (ColumnGroup)e.nextElement();
          cHeight += cGroup.getSize(header.getTable()).height;
        }
      }
      height = Math.max(height, cHeight);
    }
    return height;
  }

  private Dimension createHeaderSize(long width) {
    TableColumnModel columnModel = header.getColumnModel();
    width += columnModel.getColumnMargin() * columnModel.getColumnCount();
    if (width > Integer.MAX_VALUE) {
      width = Integer.MAX_VALUE;
    }
    return new Dimension((int)width, getHeaderHeight());
  }

  public Dimension getPreferredSize(JComponent c) {
    long width = 0;
    Enumeration enumeration = header.getColumnModel().getColumns();
    while (enumeration.hasMoreElements()) {
      TableColumn aColumn = (TableColumn)enumeration.nextElement();
      width = width + aColumn.getPreferredWidth();
    }
    return createHeaderSize(width);
  }
}
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