Swing/TreeNodePopupMenu のバックアップ(No.4)

static class TreePopupMenu extends JPopupMenu {
  private TreePath[] tsp;
  public TreePopupMenu() {
    super();
    add(new AbstractAction("path") {
      @Override public void actionPerformed(ActionEvent e) {
        JOptionPane.showMessageDialog(
          null, tsp, "path", JOptionPane.INFORMATION_MESSAGE);
      }
    });
    add(new JMenuItem("dummy"));
  }
  @Override public void show(Component c, int x, int y) {
    JTree tree = (JTree) c;
    tsp = tree.getSelectionPaths();
    if (tsp != null) {
      TreePath path = tree.getPathForLocation(x, y);
      if (path != null && Arrays.asList(tsp).contains(path)) {
        super.show(c, x, y);
      }
    }
  }
}