Swing/TableHeaderCheckBox のバックアップ(No.21)

enum Status { SELECTED, DESELECTED, INDETERMINATE }
class HeaderRenderer extends JCheckBox implements TableCellRenderer {
  private final JLabel label = new JLabel("Check All");
  private final int targetColumnIndex;
  public HeaderRenderer(JTableHeader header, int index) {
    super((String) null);
    this.targetColumnIndex = index;
    setOpaque(false);
    setFont(header.getFont());
    header.addMouseListener(new MouseAdapter() {
      @Override public void mouseClicked(MouseEvent e) {
        JTableHeader header = (JTableHeader) e.getComponent();
        JTable table = header.getTable();
        TableColumnModel columnModel = table.getColumnModel();
        int vci = columnModel.getColumnIndexAtX(e.getX());
        int mci = table.convertColumnIndexToModel(vci);
        if (mci == targetColumnIndex) {
          TableColumn column = columnModel.getColumn(vci);
          boolean b = column.getHeaderValue() == Status.DESELECTED;
          TableModel m = table.getModel();
          for (int i = 0; i < m.getRowCount(); i++) {
            m.setValueAt(b, i, mci);
          }
          column.setHeaderValue(b ? Status.SELECTED : Status.DESELECTED);
          // header.repaint();
        }
      }
    });
  }
  @Override public Component getTableCellRendererComponent(
        JTable tbl, Object val, boolean isS, boolean hasF, int row, int col) {
    TableCellRenderer r = tbl.getTableHeader().getDefaultRenderer();
    JLabel l = (JLabel) r.getTableCellRendererComponent(tbl, val, isS, hasF, row, col);
    if (targetColumnIndex == tbl.convertColumnIndexToModel(col)) {
      if (val instanceof Status) {
        switch ((Status) val) {
        case SELECTED:
          setSelected(true);
          setEnabled(true);
          break;
        case DESELECTED:
          setSelected(false);
          setEnabled(true);
          break;
        case INDETERMINATE:
          setSelected(true);
          setEnabled(false);
          break;
        default:
          throw new AssertionError("Unknown Status");
        }
      } else {
        setSelected(true);
        setEnabled(false);
      }
      label.setIcon(new ComponentIcon(this));
      l.setIcon(new ComponentIcon(label));
      l.setText(null);
    }
    return l;
  }
}
class ComponentIcon implements Icon {
  private final JComponent cmp;
  public ComponentIcon(JComponent cmp) {
    this.cmp = cmp;
  }
  @Override public int getIconWidth() {
    return cmp.getPreferredSize().width;
  }
  @Override public int getIconHeight() {
    return cmp.getPreferredSize().height;
  }
  @Override public void paintIcon(Component c, Graphics g, int x, int y) {
    SwingUtilities.paintComponent(g, cmp, c.getParent(), x, y, getIconWidth(), getIconHeight());
  }
}