Animation Add Close

animated_add_close.dart

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

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

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> with SingleTickerProviderStateMixin {
  late AnimationController animatedController;
  double _angle = 0;

  @override
  void initState() {
    animatedController =
        AnimationController(vsync: this, duration: Duration(milliseconds: 100));
    animatedController.addListener(() {
      setState(() {
        _angle = animatedController.value * 45 / 360 * pi * 2;
      });
    });
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        home: Scaffold(
            body: Center(
      child: InkResponse(
        onTap: () {
          if (animatedController.status == AnimationStatus.completed)
            animatedController.reverse();
          else if (animatedController.status == AnimationStatus.dismissed)
            animatedController.forward();
        },
        child: Transform.rotate(
          angle: _angle,
          child: Icon(
            Icons.add,
            size: 50,
          ),
        ),
      ),
    )));
  }
}

Code from https://stackoverflow.com/a/62505456/215939