timeLeft method

String timeLeft(DateTime due, String finishedText, String daysTextLong, String hoursTextLong, String minutesTextLong, String secondsTextLong, String daysTextShort, String hoursTextShort, String minutesTextShort, String secondsTextShort, { bool? longDateName, bool? showLabel, bool collapsing = false, String endingText = ' left', VoidCallback? onFinished, })

Implementation

String timeLeft(
  DateTime due,
  String finishedText,
  String daysTextLong,
  String hoursTextLong,
  String minutesTextLong,
  String secondsTextLong,
  String daysTextShort,
  String hoursTextShort,
  String minutesTextShort,
  String secondsTextShort, {
  bool? longDateName,
  bool? showLabel,
  bool collapsing = false,
  String endingText = ' left',
  VoidCallback? onFinished, // New callback parameter
}) {
  String retVal = "";

  Duration _timeUntilDue = due.difference(DateTime.now());

  int _daysUntil = _timeUntilDue.inDays;
  int _hoursUntil = _timeUntilDue.inHours - (_daysUntil * 24);
  int _minUntil =
      _timeUntilDue.inMinutes - (_daysUntil * 24 * 60) - (_hoursUntil * 60);
  int _secUntil = _timeUntilDue.inSeconds - (_minUntil * 60);
  String s = _secUntil.toString().length <= 2
      ? _secUntil.toString()
      : _secUntil.toString().substring(_secUntil.toString().length - 2);

  // Check whether to return longDateName date name or not
  if (showLabel == false) {
    if (_daysUntil > 0) {
      retVal += _daysUntil.toString() + " : ";
    }
    if (_hoursUntil > 0) {
      retVal += _hoursUntil.toString() + " : ";
    }
    if (_minUntil > 0) {
      retVal += _minUntil.toString() + " : ";
    }
    if (_secUntil > 0) {
      retVal += s;
    }
  } else {
    if (longDateName == false) {
      if (_daysUntil > 0) {
        retVal += _daysUntil.toString() + daysTextShort;
      }
      if (_hoursUntil > 0 && (!collapsing || _daysUntil <= 0)) {
        retVal += _hoursUntil.toString() + hoursTextShort;
      }
      if (_minUntil > 0 && (!collapsing || _hoursUntil <= 0)) {
        retVal += _minUntil.toString() + minutesTextShort;
      }
      if (_secUntil > 0 && (!collapsing || _minUntil <= 0)) {
        retVal += s + secondsTextShort;
      }
    } else {
      if (_daysUntil > 0) {
        retVal += _daysUntil.toString() + daysTextLong;
      }
      if (_hoursUntil > 0 && (!collapsing || _daysUntil <= 0)) {
        retVal += _hoursUntil.toString() + hoursTextLong;
      }
      if (_minUntil > 0 && (!collapsing || _hoursUntil <= 0)) {
        retVal += _minUntil.toString() + minutesTextLong;
      }
      if (_secUntil > 0 && (!collapsing || _minUntil <= 0)) {
        retVal += s + secondsTextLong;
      }
    }
  }
  if (_timeUntilDue.inSeconds < 1) {
    retVal = finishedText;
    if (onFinished != null) {
      onFinished(); // Invoke the callback when the countdown is due
    }
  } else if (collapsing) {
    retVal += endingText;
  }
  return retVal;
}