Flutter animated timer that counts up smoothly with dynamic transitions

animated_count_up_timer.dart

import 'package:flutter/material.dart';
import 'dart:async';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'CountUp Timer Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const TimerScreen(),
    );
  }
}

class TimerScreen extends StatelessWidget {
  const TimerScreen({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Color(0xFFffedb7),
      appBar: AppBar(
        title: const Text("CountUp Timer"),
      ),
      body: Center(
        child: CountUpTimer(
          maxDuration: const Duration(seconds: 10),  // Set the duration
        ),
      ),
    );
  }
}

class CountUpTimer extends StatefulWidget {
  final Duration maxDuration;

  const CountUpTimer({Key? key, this.maxDuration = const Duration(minutes: 15)}) : super(key: key);

  @override
  _CountUpTimerState createState() => _CountUpTimerState();
}

class _CountUpTimerState extends State<CountUpTimer> {
  Duration duration = const Duration();  // Starts from 0
  Timer? timer;

  @override
  void initState() {
    super.initState();
    startTimer();
  }

  void startTimer() {
    timer = Timer.periodic(const Duration(seconds: 1), (_) => addTime());
  }

  void addTime() {
    setState(() {
      final seconds = duration.inSeconds + 1;
      if (seconds >= widget.maxDuration.inSeconds + 1) {
        timer?.cancel();
      } else {
        duration = Duration(seconds: seconds);
      }
    });
  }

  @override
  void dispose() {
    timer?.cancel();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return buildTime();
  }

  Widget buildTime() {
    String twoDigits(int n) => n.toString().padLeft(2, '0');
    final hours = twoDigits(duration.inHours);
    final minutes = twoDigits(duration.inMinutes.remainder(60));
    final seconds = twoDigits(duration.inSeconds.remainder(60));

    return Row(
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        buildTimeColumn(hours, "Hrs"),
        buildTimeColumn(minutes, "Mins"),
        buildTimeColumn(seconds, "Secs", isLast: true),
      ],
    );
  }

  Widget buildTimeColumn(String time, String label, {bool isLast = false}) {
    return Column(
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        Row(
          children: [
            buildDigit(time[0]),
            buildDigit(time[1]),
            if (!isLast) buildTimeSeparator(),
          ],
        ),
        buildLabel(label),
      ],
    );
  }

  Widget buildDigit(String digit) {
    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 4),
      margin: const EdgeInsets.symmetric(horizontal: 2),
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(10),
      ),
      child: ClipRect(
        child: AnimatedSwitcher(
          duration: const Duration(milliseconds: 600),
          switchInCurve: Curves.easeOutExpo,
          switchOutCurve: Curves.easeInExpo,
          transitionBuilder: (Widget child, Animation<double> animation) {
            return Stack(
              children: <Widget>[
                SlideTransition(
                  position: Tween<Offset>(
                    begin: const Offset(0, -1),
                    end: const Offset(0, 1),
                  ).animate(CurvedAnimation(
                    parent: animation,
                    curve: Curves.easeOutCubic,
                  )),
                  child: FadeTransition(
                    opacity: animation,
                    child: child,
                  ),
                ),
                SlideTransition(
                  position: Tween<Offset>(
                    begin: const Offset(0, -1),
                    end: const Offset(0, 0),
                  ).animate(CurvedAnimation(
                    parent: animation,
                    curve: Curves.bounceIn,
                  )),
                  child: FadeTransition(
                    opacity: animation,
                    child: child,
                  ),
                ),
              ],
            );
          },
          child: Text(
            digit,
            key: ValueKey<String>(digit),
            style: const TextStyle(
              fontWeight: FontWeight.bold,
              color: Colors.black,
              fontSize: 50,
            ),
          ),
        ),
      ),
    );
  }

  Widget buildLabel(String label) {
    return Text(
      label,
      style: const TextStyle(
        color: Colors.black,
        fontSize: 20,
        fontWeight: FontWeight.bold,
      ),
    );
  }

  Widget buildTimeSeparator() {
    return Padding(
      padding: const EdgeInsets.symmetric(horizontal: 2.0),
      child: const Text(
        ":",
        style: TextStyle(
          color: Colors.black,
          fontSize: 50,
        ),
      ),
    );
  }
}

🎉 Check out the Animated Count-Up Timer! ⏱️

Experience a sleek, animated timer that counts up smoothly with dynamic transitions. Perfect for keeping track of time in your app with an engaging and modern UI! 🔥

Whether you're building a fitness tracker, a countdown, or just want a stylish timer, this animated CountUp Timer will elevate your app's design and functionality!

Try it now and add a professional touch to your project. 🚀

✅ For Countdown Timer: Learn how to build a countdown timer with animations to add excitement to your time-sensitive features.
👉 Read the step-by-step guide on Medium

Visual Preview

animated_count_up_timer_preview.mov