flutter-devs

  @override
  Widget build(BuildContext context) {
    return AnimatedBuilder(
      animation: _animationController,
      builder: (context, child) {
        return Container(
          width: 70.0,
          height: 35.0,
          decoration: BoxDecoration(
              borderRadius: BorderRadius.circular(20.0),

flutter-devs

  Animation _circleAnimation;
  AnimationController _animationController;

  @override
  void initState() {
    super.initState();
    _animationController =
        AnimationController(vsync: this, duration: Duration(milliseconds: 60));
    _circleAnimation = AlignmentTween(

flutter-devs

library custom_switch;
import 'package:flutter/material.dart';

class CustomSwitch extends StatefulWidget {
  
  final bool value;
  final ValueChanged<bool> onChanged;
  final Color activeColor;

  const CustomSwitch({Key key, this.value, this.onChanged, this.activeColor})

flutter-devs

  @override
  Widget build(BuildContext context) {
    final width = MediaQuery.of(context).size.width;
    final height = MediaQuery.of(context).size.height;
    return Scaffold(
      appBar: AppBar(
        title: Text('Animated Screen'),
      ),
      body: Center(
        child: AnimatedBuilder(

flutter-devs

class AnimatedScreen extends StatefulWidget {
  @override
  _AnimatedScreenState createState() => _AnimatedScreenState();
}

class _AnimatedScreenState extends State<AnimatedScreen>
    with TickerProviderStateMixin {
  Animation _containerRadiusAnimation,
      _containerSizeAnimation,
      _containerColorAnimation;

flutter-devs

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Example Animations'),
      ),
      body: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: <Widget>[
          firstChild(),

flutter-devs

  @override
  void dispose() {
    super.dispose();
    _arrowAnimationController?.dispose();
    _heartAnimationController?.dispose();
  }

flutter-devs

 @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Example Animations'),
      ),
      body: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: <Widget>[
          firstChild(),

flutter-devs

class HomeScreen extends StatefulWidget {
  @override
  _HomeScreenState createState() => _HomeScreenState();
}

class _HomeScreenState extends State<HomeScreen> with TickerProviderStateMixin {
  
Animation _arrowAnimation, _heartAnimation;
AnimationController _arrowAnimationController, _heartAnimationController;  
  

flutter-devs

  Widget firstChild() {
    return Row(
      mainAxisAlignment: MainAxisAlignment.spaceAround,
      children: <Widget>[
        AnimatedBuilder(
          animation: _arrowAnimationController,
          builder: (context, child) => Transform.rotate(
                angle: _arrowAnimation.value,
                child: Icon(
                  Icons.expand_more,