code: func (e *EditField) OnKeyPress(fn func(term.Key, rune) bool) {
  	e.onKeyPress = fn
  }
docs: // OnKeyPress sets the callback that is called when a user presses a Key while
  // the controls is active. If a handler processes the key it should return
  // true. If handler returns false it means that the default handler will
  // process the key