Swing/TwoRowsCellRenderer のバックアップ(No.12)

JTable table = new JTable(model);
table.setAutoCreateRowSorter(true);
table.setRowHeight(table.getRowHeight() * 2);
table.setDefaultRenderer(String.class, new TwoRowsCellRenderer());
// ...

class TwoRowsCellRenderer extends JPanel implements TableCellRenderer {
  private final JLabel top = new JLabel();
  private final JLabel bottom = new JLabel();

  public TwoRowsCellRenderer() {
    super(new GridLayout(2, 1, 0, 0));
    add(top);
    add(bottom);
  }

  @Override public Component getTableCellRendererComponent(
      JTable table, Object value,
      boolean isSelected, boolean hasFocus, int row, int column) {
    if (isSelected) {
      setForeground(table.getSelectionForeground());
      setBackground(table.getSelectionBackground());
    } else {
      setForeground(table.getForeground());
      setBackground(table.getBackground());
    }
    setFont(table.getFont());
    FontMetrics fm  = table.getFontMetrics(table.getFont());
    String text = Objects.toString(value, "");
    String first = text;
    String second  = "";
    // int columnWidth = table.getColumnModel().getColumn(column).getWidth();
    int columnWidth = table.getCellRect(0, column, false).width;
    int textWidth = 0;
    for (int i = 0; i < text.length(); i++) {
      textWidth += fm.charWidth(text.charAt(i));
      if (textWidth > columnWidth) {
        first = text.substring(0, i - 1);
        second = text.substring(i - 1);
        break;
      }
    }
    top.setText(first);
    bottom.setText(second);
    return this;
  }
}