static JTextField onEnter(JTextField tf, JButton btn) {
  if (btn != null)
    onEnter(tf, r { clickButton(btn) });
  ret tf;
}

static JTextField onEnter(JTextField tf, O action) {
  if (action == null || tf == null) ret tf;
  tf.addActionListener(actionListener {
    tf.selectAll();
    callF(action);
  });
  ret tf;
}

static JButton onEnter(JButton btn, final O action) {
  if (action == null || btn == null) ret btn;
  btn.addActionListener(actionListener(action));
  ret btn;
}

static JList onEnter(JList list, O action) {
  list.addKeyListener(enterKeyListener(rCallOnSelectedListItem(list, action)));
  ret list;
}

static JComboBox onEnter(final JComboBox cb, Runnable action) {
  swing {
    if (cb.isEditable()) {
      JTextField text = (JTextField) cb.getEditor().getEditorComponent();
      onEnter(text, action);
    } else {
      cb.getInputMap().put(KeyStroke.getKeyStroke("ENTER"), "enter");
      cb.getActionMap().put("enter", abstractAction("", r { cb.hidePopup(); callF(action); }));
    }
  }
  ret cb;
}

static JTable onEnter(final JTable table, fO action) {  
  table.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT)
    .put(KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0), "Enter");
    
  table.getActionMap().put("Enter", new AbstractAction() {
    public void actionPerformed(ActionEvent e) {
      callF(action, table.getSelectedRow());
    }
  });
  ret table;
}

/*static JTextArea onEnter(final JTextArea ta, fO action) {
  addKeyListener(ta, enterKeyListener(action));
  ret ta;
}*/

static JTextField onEnter(Runnable action, JTextField tf) {
  ret onEnter(tf, action);
}