Download Button Animation In Flutter

Download Button Animation In Flutter :

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Screenshot 3 :

ButtonAnimation.dart

import 'package:flutter/material.dart';

class ButtonAnimation extends StatefulWidget {
  final Color primaryColor;
  final Color darkPrimaryColor;

  ButtonAnimation(this.primaryColor, this.darkPrimaryColor);

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

class _ButtonAnimationState extends State<ButtonAnimation>
    with TickerProviderStateMixin {
  AnimationController _animationController;
  AnimationController _scaleAnimationController;
  AnimationController _fadeAnimationController;

  Animation<double> _animation;
  Animation<double> _scaleAnimation;
  Animation<double> _fadeAnimation;

  double buttonWidth = 200.0;
  double scale = 1.0;
  bool animationComplete = false;
  double barColorOpacity = .6;
  bool animationStart = false;

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

    _animationController =
        AnimationController(vsync: this, duration: Duration(seconds: 3));

    _scaleAnimationController =
        AnimationController(vsync: this, duration: Duration(milliseconds: 300));

    _fadeAnimationController =
        AnimationController(vsync: this, duration: Duration(milliseconds: 400));

    _fadeAnimation = Tween<double>(
      begin: 50.0,
      end: 0.0,
    ).animate(_fadeAnimationController);

    _scaleAnimation = Tween<double>(
      begin: 1.0,
      end: 1.05,
    ).animate(_scaleAnimationController)
      ..addStatusListener((status) {
        if (status == AnimationStatus.completed) {
          _scaleAnimationController.reverse();
          _fadeAnimationController.forward();
          _animationController.forward();
        }
      });

    _animation = Tween<double>(begin: 0.0, end: buttonWidth)
        .animate(_animationController)
          ..addStatusListener((status) {
            if (status == AnimationStatus.completed) {
              setState(() {
                animationComplete = true;
                barColorOpacity = .0;
              });
            }
          });
  }

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

    _animationController.dispose();
    _fadeAnimationController.dispose();
    _scaleAnimationController.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Stack(children: <Widget>[
      AnimatedBuilder(
          animation: _scaleAnimationController,
          builder: (context, child) => Transform.scale(
              scale: _scaleAnimation.value,
              child: InkWell(
                  onTap: () {
                    _scaleAnimationController.forward();
                  },
                  child: Container(
                      width: 200,
                      height: 50,
                      decoration: BoxDecoration(
                          color: widget.primaryColor,
                          borderRadius: BorderRadius.circular(3)),
                      child: Row(children: <Widget>[
                        Expanded(
                            child: Align(
                                child: animationComplete == false
                                    ? Text(
                                        "Download",
                                        style: TextStyle(
                                            color: Colors.white, fontSize: 16),
                                      )
                                    : Icon(
                                        Icons.check,
                                        color: Colors.white,
                                      ))),
                        AnimatedBuilder(
                            animation: _fadeAnimationController,
                            builder: (context, child) => Container(
                                  width: _fadeAnimation.value,
                                  height: 50,
                                  decoration: BoxDecoration(
                                      color: widget.darkPrimaryColor,
                                      borderRadius: BorderRadius.circular(3)),
                                  child: Icon(
                                    Icons.arrow_downward,
                                    color: Colors.white,
                                  ),
                                ))
                      ]))))),
      AnimatedBuilder(
          animation: _animationController,
          builder: (context, child) => Positioned(
              left: 0,
              top: 0,
              width: _animation.value,
              height: 50,
              child: AnimatedOpacity(
                  duration: Duration(milliseconds: 200),
                  opacity: barColorOpacity,
                  child: Container(
                      decoration: BoxDecoration(color: Colors.white)))))
    ]);
  }
}

main.dart

import 'package:flutter/material.dart';

import 'ButtonAnimation.dart';

void main() => runApp(
  MaterialApp(
    debugShowCheckedModeBanner: false,
    home: HomePage()
  )
);

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        child: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              ButtonAnimation(Color.fromRGBO(57, 92, 249, 1), Color.fromRGBO(44, 78, 233, 1)),
              SizedBox(height: 20,),
              ButtonAnimation(Colors.yellow[700], Colors.yellow[800]),
              SizedBox(height: 20,),

              ButtonAnimation(Colors.green[400], Colors.green[600]),
              SizedBox(height: 20,),

              ButtonAnimation(Colors.red[700], Colors.red[800]),
            ],
          ),
        ),
      ),
    );
  }
}

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