Swing/TableCellExpandCollapseOnClick のバックアップ(No.1)

int defaultHeight = 20;
JTable table = new JTable(model) {
  @Override public void updateUI() {
    super.updateUI();
    setAutoCreateRowSorter(true);
    setSurrendersFocusOnKeystroke(true);
    setRowHeight(defaultHeight);
    setDefaultRenderer(RowHeader.class, new RowHeaderRenderer());
    setDefaultEditor(RowHeader.class, new RowHeaderEditor());
    TableColumn column = getColumnModel().getColumn(1);
    column.setCellRenderer(new TextAreaCellRenderer());
    column.setPreferredWidth(160);
  }
};
table.getModel().addTableModelListener(e -> {
  int mc = e.getColumn();
  int mr = e.getFirstRow();
  int vc = table.convertColumnIndexToView(mc);
  int vr = table.convertRowIndexToView(mr);
  Object o = table.getValueAt(vr, vc);
  if (mc == 0 && o instanceof RowHeader) {
    RowHeader rh = (RowHeader) o;
    int vc1 = table.convertColumnIndexToView(1);
    TableCellRenderer r = table.getColumnModel().getColumn(vc1)
                               .getCellRenderer();
    Object v = table.getValueAt(vr, vc1);
    Component c = r.getTableCellRendererComponent(
        table, v, true, true, vr, vc1);
    int h = rh.isSelected() ? c.getPreferredSize().height
                            : defaultHeight;
    table.setRowHeight(vr, h);
  }
});