cpd_2022_zi/lib/providers/timer_provider.dart

import 'dart:async';

import 'package:flutter/material.dart';

class TimerProvider extends ChangeNotifier {
  Timer? _timer;
  bool started = false;
  Duration _duration = const Duration();
  int get elapsedSeconds => _duration.inSeconds;
  int get elapsedMilliseconds => _duration.inMilliseconds;
  final Duration _tickRate = const Duration(milliseconds: 20);

  void startTimer(Duration duration) {
    _duration = Duration.zero;
    started = true;
    _timer = Timer.periodic(_tickRate, ((timer) {
      _duration += _tickRate;
      if (elapsedSeconds >= duration.inSeconds) {
        _timer?.cancel();
        started = false;
      }
      notifyListeners();
    }));
  }

  void stopTimer() {
    started = false;
    _timer?.cancel();
    _timer = null;
    _duration = Duration.zero;
  }

  @override
  void dispose() {
    stopTimer();
    super.dispose();
  }
}