awesome-uiwidgets/AwesomeUIWidgets/Assets/Scripts/AnimationDemo.cs

using System;
using System.Collections.Generic;
using uiwidgets;
using Unity.UIWidgets.animation;
using Unity.UIWidgets.engine;
using Unity.UIWidgets.foundation;
using Unity.UIWidgets.gestures;
using Unity.UIWidgets.material;
using Unity.UIWidgets.ui;
using Unity.UIWidgets.widgets;
using UnityEngine;
using Material = Unity.UIWidgets.material.Material;
using Text = Unity.UIWidgets.widgets.Text;
using ui_ = Unity.UIWidgets.widgets.ui_;

namespace UIWidgetsSample
{
    public class AnimationDemo : UIWidgetsPanel
    {
        protected void OnEnable()
        {
            base.OnEnable();
        }

        protected override void main()
        {
            ui_.runApp(new HeroAnimation());
        }
    }

    public class PhotoHero : StatelessWidget
    {
        public PhotoHero(Key key = null, string photo = null, GestureTapCallback onTap = null, float? width = null) :
            base(key: key)
        {
            this.photo = photo;
            this.onTap = onTap;
            this.width = width;
        }

        string photo;
        GestureTapCallback onTap;
        float? width;

        public override Widget build(BuildContext context)
        {
            return new Hero(
                tag: photo,
                child: new Material(
                    color: Colors.transparent,
                    child: new InkWell(
                        onTap: onTap,
                        child: new Lottie(photo, frame: 0, size: new Size(width.Value, width.Value))
                    )
                )
            );
        }
    }

    class HeroAnimation : StatelessWidget
    {
        public override Widget build(BuildContext context)
        {
            return new MaterialApp(home: new Scaffold(
                    appBar: new AppBar(
                        title: new Text("Basic Hero Animation")
                    ),
                    body: new Center(
                        child: new Builder(
                            builder: (context1) => new Column(children: new List<Widget>()
                                {
                                    new Text("here is a hero animation"),
                                    new PhotoHero(
                                        photo: "66992-the-flying-rocket.json",
                                        width: 200.0f,
                                        onTap: () =>
                                        {
                                            Navigator.of(context1).push(new MaterialPageRoute(
                                                builder: (BuildContext innerContext) => new MyHomePage()
                                            ));
                                        }
                                    )
                                }
                            )
                        )
                    )
                )
            );
        }
    }


    public class MyHomePage : StatefulWidget
    {
        public override State createState() => new _MyHomePageState();
    }

    public class _MyHomePageState : SingleTickerProviderStateMixin<MyHomePage>
    {
        //*-----defining animation and animation controller-----*
        AnimationController _controller;
        Animation<Size> _myAnimation;

        public override void initState()
        {
            base.initState();
            _controller = new AnimationController(
                vsync: this,
                duration: TimeSpan.FromMilliseconds(1000)
            );
            _myAnimation = new SizeTween(
                begin: new Size(100, 100),
                end: new Size(120, 120)
            ).animate(
                new CurvedAnimation(parent: _controller, curve: Curves.bounceIn)
            );

            _controller.addStatusListener((AnimationStatus status) =>
            {
                if (status == AnimationStatus.completed)
                {
                    _controller.repeat();
                }
            });
        }

        public override void dispose()
        {
            base.dispose();
            //-disposing the animation controller-
            _controller.dispose();
        }

        public override Widget build(BuildContext context)
        {
            return new Scaffold(
                appBar: new AppBar(
                    title: new Text("Flutter Animations")
                ),
                body: new Center(
                    child:
                    new AnimatedBuilder(
                        animation: _myAnimation,
                        builder: (_, _controller) =>
                            new PhotoHero(
                                photo: "66992-the-flying-rocket.json",
                                width: _myAnimation.value.width
                            )
                    )
                ),
                floatingActionButtonLocation: FloatingActionButtonLocation.centerFloat,
                floatingActionButton: new FloatingActionButton(
                    child: new Icon(Icons.play_arrow),
                    onPressed: () => { _controller.forward(); }
                )
            );
        }
    }
}