static JTextField onEnterAndNow(JTextField tf, final O action) {
  onEnter(tf, action);
  pcallF(action);
  ret tf;
}

static JButton onEnterAndNow(JButton btn, final O action) {
  onEnter(btn, action);
  pcallF(action);
  ret btn;
}

static JList onEnterAndNow(JList list, final O action) {
  onEnter(list, action);
  pcallF(action);
  ret list;
}