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

class RightMouseButtonLayerUI extends LayerUI<JScrollPane> {
  @Override public void installUI(JComponent c) {
    super.installUI(c);
    if (c instanceof JLayer) {
      ((JLayer<?>) c).setLayerEventMask(AWTEvent.MOUSE_EVENT_MASK);
    }
  }

  @Override public void uninstallUI(JComponent c) {
    if (c instanceof JLayer) {
      ((JLayer<?>) c).setLayerEventMask(0);
    }
    super.uninstallUI(c);
  }

  @Override protected void processMouseEvent(
        MouseEvent e, JLayer<? extends JScrollPane> l) {
    Component c = e.getComponent();
    if (c instanceof JTable && SwingUtilities.isRightMouseButton(e)) {
      JTable table = (JTable) c;
      if (table.isEditing()) {
        table.removeEditor();
      }
      Point pt = e.getPoint();
      Rectangle r = TableUtils.getCellArea(table);
      if (r.contains(pt)) {
        int currentRow = table.rowAtPoint(pt);
        int currentColumn = table.columnAtPoint(pt);
        if (TableUtils.isNotRowContains(table.getSelectedRows(), currentRow)) {
          table.changeSelection(currentRow, currentColumn, false, false);
        }
      } else {
        table.clearSelection();
      }
    } else {
      super.processMouseEvent(e, l);
    }
  }
}

final class TableUtils {
  private TableUtils() {
    /* Singleton */
  }

  public static Rectangle getCellArea(JTable table) {
    Rectangle start = table.getCellRect(0, 0, true);
    int rc = table.getRowCount();
    int cc = table.getColumnCount();
    Rectangle end = table.getCellRect(rc - 1, cc - 1, true);
    return start.union(end);
  }

  public static boolean isNotRowContains(int[] selectedRows, int currentRow) {
    for (int i : selectedRows) {
      if (i == currentRow) {
        return false;
      }
    }
    return true;
  }
}