please include function componentPopupMenu.

svoid showInternalFramePopupMenu(final JInternalFrame f) {
  swing {
    L maker = componentPopupMenu_map.get(f);
    if (empty(maker)) ret;

    new JPopupMenu menu;
    int emptyCount = menu.getComponentCount();
    componentPopupMenu_mouseEvent.set(new MouseEvent);
    
    for (O menuMaker : maker)
      pcallF(menuMaker, menu);
      
    // show menu if any items in it
    if (menu.getComponentCount() != emptyCount)
      menu.show(f, 30, 15); // ?
  }
}