Swing/AutoWrapTableCell のバックアップ(No.20)

class TextAreaCellRenderer extends JTextArea implements TableCellRenderer {
  private final List<List<Integer>> cellHeights = new ArrayList<>();

  @Override public void updateUI() {
    super.updateUI();
    setLineWrap(true);
    setBorder(BorderFactory.createEmptyBorder(2, 2, 2, 2));
    setName("Table.cellRenderer");
  }
  @Override public Component getTableCellRendererComponent(
      JTable table, Object value, boolean isSelected, boolean hasFocus,
      int row, int column) {
    setFont(table.getFont());
    setText(Objects.toString(value, ""));
    adjustRowHeight(table, row, column);
    return this;
  }

/**
 * Calculate the new preferred height for a given row,
 * and sets the height on the table.
 * http://blog.botunge.dk/post/2009/10/09/JTable-multiline-cell-renderer.aspx
 */
  private void adjustRowHeight(JTable table, int row, int column) {
  // The trick to get this to work properly is to set the width of the column to
  // the textarea. The reason for this is that getPreferredSize(), without a width
  // tries to place all the text in one line.
  // By setting the size with the with of the column,
  // getPreferredSize() returnes the proper height which the row should have in
  // order to make room for the text.
  // int cWidth = table.getTableHeader().getColumnModel().getColumn(column).getWidth();
  // int cWidth = table.getCellRect(row, column, false).width; //IntercellSpacingを無視
  // setSize(new Dimension(cWidth, 1000));

    setBounds(table.getCellRect(row, column, false)); // setSizeではなくsetBoundsでも可
    // doLayout(); // 必要なさそう

    int preferredHeight = getPreferredSize().height;
    while (cellHeights.size() <= row) {
      cellHeights.add(new ArrayList<>(column));
    }
    List<Integer> list = cellHeights.get(row);
    while (list.size() <= column) {
      list.add(0);
    }
    list.set(column, preferredHeight);
    int max = list.stream().max(Integer::compare).get();
    if (table.getRowHeight(row) != max) {
      table.setRowHeight(row, max);
    }
  }
}