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[Flutter] A countdown timer widget using overlay [With color animation]
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import 'package:flutter/material.dart'; | |
import 'package:timer_count_down/timer_count_down.dart'; | |
class CountdownTimer extends StatefulWidget { | |
final Duration timerDuration; | |
final VoidCallback onComplete; | |
final String Function(double seconds) formatTimerString; | |
final Color startColor; | |
final Color endColor; | |
CountdownTimer({ | |
Key key, | |
@required this.timerDuration, | |
this.onComplete, | |
this.formatTimerString, | |
this.startColor = Colors.green, | |
this.endColor = Colors.red, | |
}) : super(key: key); | |
@override | |
_CountdownTimerState createState() => _CountdownTimerState(); | |
} | |
class _CountdownTimerState extends State<CountdownTimer> { | |
ColorTween _colorTween; | |
@override | |
void initState() { | |
// tween values will be shown in reverse as the timer is going backwards | |
_colorTween = ColorTween( | |
begin: widget.endColor, | |
end: widget.startColor, | |
); | |
super.initState(); | |
} | |
@override | |
void dispose() { | |
super.dispose(); | |
} | |
int get totalDurationInSeconds => widget.timerDuration.inSeconds; | |
@override | |
Widget build(BuildContext context) { | |
return Countdown( | |
seconds: totalDurationInSeconds, | |
build: (context, countDownSeconds) { | |
final currentProgress = _calculateProgress( | |
totalDurationInSeconds, | |
countDownSeconds, | |
); | |
final timerString = buildTimerString(countDownSeconds); | |
return SafeArea( | |
child: SizedBox( | |
height: 8, | |
child: Stack( | |
alignment: Alignment.topCenter, | |
children: [ | |
Container( | |
color: _colorTween.lerp(currentProgress), | |
child: Row( | |
mainAxisAlignment: MainAxisAlignment.center, | |
children: [ | |
Padding( | |
padding: EdgeInsets.symmetric(vertical: 2), | |
child: Text( | |
timerString, | |
style: TextStyle( | |
fontSize: 14, | |
color: Colors.white, | |
fontWeight: FontWeight.w700, | |
), | |
), | |
), | |
], | |
), | |
), | |
], | |
), | |
), | |
); | |
}, | |
onFinished: () { | |
widget.onComplete?.call(); | |
}, | |
); | |
} | |
buildTimerString(double seconds) { | |
if (widget.formatTimerString != null) { | |
return widget.formatTimerString(seconds); | |
} | |
// format the string manually | |
final rawMinutes = seconds / 60; | |
final remainingMinutes = rawMinutes.toInt(); | |
final remainingSeconds = (seconds % 60).toInt(); | |
return '${remainingMinutes == 0 ? '' : '$remainingMinutes m '}$remainingSeconds s'; | |
} | |
double _calculateProgress( | |
int totalDurationInSeconds, double countDownSeconds) { | |
var progress = (countDownSeconds / totalDurationInSeconds); | |
if (progress >= 1) progress = 1; | |
return progress; | |
} | |
} |
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