abstract sclass DynTable extends DynModule {
  transient JTable table;
  transient L<Map> data;

  JComponent visualize() {
    table = dataToTable_uneditable(sexyTable(), data = calc());
    onDoubleClickOrEnter(table, voidfunc(int row) {
      Map line = _get(data, row);
      if (line != null) onDoubleClick(line);
    });
    ret table;
  }
  void unvisualize() { table = null; }
  
  void onDoubleClick(Map line) {}
  
  void update() {
    if (table != null) dataToTable_uneditable(table, data = calc());
  }

  // should cache results if they are expensive to make
  abstract L<Map> calc();
}

Began life as a copy of #1015977