countdown

countdown.dart

import 'dart:async';

import 'package:flutter/material.dart';
import 'package:mobile/utils/formatters.dart';

class Countdown extends StatelessWidget {
  const Countdown({
    Key key,
    @required this.millisecondsToTime,
    this.style,
    this.textAlign,
    this.onEnd,
  }) : super(key: key);

  final int millisecondsToTime;

  final TextStyle style;

  final TextAlign textAlign;

  final Function onEnd;

  @override
  Widget build(BuildContext context) {
    return StreamBuilder(
      stream: Stream.periodic(Duration(seconds: 1), (i) => i),
      builder: (BuildContext context, AsyncSnapshot<int> snapshot) {
        int now = DateTime.now().millisecondsSinceEpoch; // Changes every tim
        Duration remaining = Duration(milliseconds: (millisecondsToTime - now));

        if (remaining == Duration.zero && onEnd != null) onEnd();
        var dateString =
            '${remaining.inHours}:${minuteSecondFormatter.format(DateTime.fromMillisecondsSinceEpoch(remaining.inMilliseconds))}';

        return Text(
          dateString,
          style: style,
          textAlign: textAlign,
        );
      },
    );
  }
}