reverseAirports method

Implementation

void reverseAirports() {
  if (searchFromAirport.value != null && searchToAirport.value != null) {
    final tmp = searchToAirport.value;
    searchToAirport.value = searchFromAirport.value;
    searchFromAirport.value = tmp;
    final tmp2 = toAirportController.text;
    toAirportController.text = fromAirportController.text;
    fromAirportController.text = tmp2;
  }
}