JTreeのノードにクリック可能なJButtonを複数配置する

class ButtonCellEditor extends AbstractCellEditor implements TreeCellEditor {
  private final ButtonPanel panel = new ButtonPanel();
  protected ButtonCellEditor() {
    super();
    panel.b1.addActionListener(e -> {
      System.out.println("b1: " + panel.renderer.getText());
      stopCellEditing();
    });
    panel.b2.addActionListener(e -> {
      System.out.println("b2: " + panel.renderer.getText());
      stopCellEditing();
    });
    panel.b3.addActionListener(e -> {
      System.out.println("b3: " + panel.renderer.getText());
      stopCellEditing();
    });
  }

  @Override public Component getTreeCellEditorComponent(
      JTree tree, Object value, boolean isSelected, boolean expanded,
      boolean leaf, int row) {
    Component c = panel.renderer.getTreeCellRendererComponent(
        tree, value, true, expanded, leaf, row, true);
    return panel.remakePanel(c);
  }

  @Override public Object getCellEditorValue() {
    return panel.renderer.getText();
  }

  @Override public boolean isCellEditable(EventObject e) {
    Object source = e.getSource();
    if (!(source instanceof JTree) || !(e instanceof MouseEvent)) {
      return false;
    }
    JTree tree = (JTree) source;
    Point p = ((MouseEvent) e).getPoint();
    TreePath path = tree.getPathForLocation(p.x, p.y);
    if (Objects.isNull(path)) {
      return false;
    }
    Rectangle r = tree.getPathBounds(path);
    if (Objects.isNull(r)) {
      return false;
    }
    // r.width = panel.getButtonAreaWidth();
    // return r.contains(p);
    if (r.contains(p)) {
      TreeNode node = (TreeNode) path.getLastPathComponent();
      int row = tree.getRowForLocation(p.x, p.y);
      Component c = tree.getCellRenderer().getTreeCellRendererComponent(
          tree, " ", true, true, node.isLeaf(), row, true);
      c.setBounds(r);
      c.setLocation(0, 0);
      // tree.doLayout();
      tree.revalidate();
      p.translate(-r.x, -r.y);
      Component o = SwingUtilities.getDeepestComponentAt(c, p.x, p.y);
      if (o instanceof JButton) {
        return true;
      }
    }
    return false;
  }
}