JTableHeaderにJButtonを追加する

@Override public void mouseClicked(MouseEvent e) {
  JTableHeader header = (JTableHeader) e.getSource();
  JTable table = header.getTable();
  TableColumnModel columnModel = table.getColumnModel();
  int vci = columnModel.getColumnIndexAtX(e.getX());
  int mci = table.convertColumnIndexToModel(vci);
  TableColumn column = table.getColumnModel().getColumn(mci);
  Rectangle r = header.getHeaderRect(vci);
  Container c = (Container) getTableCellRendererComponent(table, "", true, true, -1, vci);
  // if (!isNimbus) {
  //   Insets i = c.getInsets();
  //   r.translate(r.width - i.right, 0);
  // } else {
  r.translate(r.width - BUTTON_WIDTH, 0);
  r.setSize(BUTTON_WIDTH, r.height);
  Point pt = e.getPoint();
  if (c.getComponentCount() > 0 && r.contains(pt) && pop != null) {
    pop.show(header, r.x, r.height);
    JButton b = (JButton) c.getComponent(0);
    b.doClick();
    e.consume();
  }
}

@Override public void mouseExited(MouseEvent e) {
  rolloverIndex = -1;
}

@Override public void mouseMoved(MouseEvent e) {
  JTableHeader header = (JTableHeader) e.getSource();
  JTable table = header.getTable();
  TableColumnModel columnModel = table.getColumnModel();
  int vci = columnModel.getColumnIndexAtX(e.getX());
  int mci = table.convertColumnIndexToModel(vci);
  rolloverIndex = mci;
}