main.dart

/*
MIT License

Copyright (c) 2020 Mariano Zorrilla

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/

import 'package:flutter/material.dart';

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

enum ArmAnim {
  normal,
  hi,
  hide,
}

class YetiApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Yeti',
      home: YetiScreen(),
    );
  }
}

class YetiScreen extends StatefulWidget {
  @override
  _YetiScreenState createState() => _YetiScreenState();
}

class _YetiScreenState extends State<YetiScreen> with TickerProviderStateMixin {
  static String baseUrl = 'https://firebasestorage.googleapis.com/';
  static String baseRepo = 'v0/b/flutter-yeti.appspot.com/o/';

  Offset hoverPos = Offset.zero;
  String eyesPath = baseUrl + baseRepo + 'eye.png?alt=media';
  double mouthLocation = -0.05;

  ArmAnim _leftArmAnim = ArmAnim.normal;
  ArmAnim _rightArmAnim = ArmAnim.normal;

  double animateHandHi = 0.15;
  AnimationController _hiController;
  Animation<double> _hiAnimation;

  double animateHandHide = 0.25;
  AnimationController _hideController;
  Animation<double> _hideAnimation;

  bool _armsOpen = true;

  Widget powered() {
    return Align(
      alignment: Alignment.bottomCenter,
      child: Container(
        width: 150,
        child: Padding(
          padding: EdgeInsets.only(
            bottom: 20,
            top: 10,
          ),
          child: Row(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Text(
                'Powered by',
                style: TextStyle(
                  fontFamily: 'Sans',
                  fontSize: 16,
                  color: Colors.white,
                  fontWeight: FontWeight.w600,
                ),
              ),
              SizedBox(width: 5),
              Semantics(
                child: FlutterLogo(),
                label: "Flutter",
                readOnly: true,
              )
            ],
          ),
        ),
      ),
    );
  }

  void _changeImage() {
    setState(() {
      eyesPath = baseUrl + baseRepo + 'eye_happy.png?alt=media';
      mouthLocation = -0.08;
      _armsOpen = false;
    });

    Future.delayed(Duration(milliseconds: 1000), () {
      setState(() {
        eyesPath = baseUrl + baseRepo + 'eye.png?alt=media';
        mouthLocation = -0.05;
        _armsOpen = true;
      });
    });
  }

  void _animateHi() {
    setState(() => _leftArmAnim = ArmAnim.hi);

    _hiAnimation = Tween<double>(
      begin: 0.15,
      end: 0.45,
    ).animate(_hiController);

    _hiController.forward();

    _hiAnimation.addListener(() {
      setState(() => animateHandHi = _hiAnimation.value);
    });

    Stream.periodic(Duration(milliseconds: 500), (value) => value)
        .take(5)
        .listen((event) {
      event % 2 == 0 ? _hiController.reverse() : _hiController.forward();
    }).onDone(() => setState(() => _leftArmAnim = ArmAnim.normal));
  }

  void _animateHide() {
    setState(() {
      _leftArmAnim = ArmAnim.hide;
      _rightArmAnim = ArmAnim.hide;
    });
    _hideAnimation =
        Tween<double>(begin: 0.25, end: -0.15).animate(_hideController);
    _hideAnimation.addListener(() {
      setState(() => animateHandHide = _hideAnimation.value);
    });

    Future.delayed(Duration(milliseconds: 1000), () {
      _hideController.forward();
    });

    Future.delayed(Duration(milliseconds: 2500), () {
      setState(() {
        _leftArmAnim = ArmAnim.normal;
        _rightArmAnim = ArmAnim.normal;
      });

      _hideController.value = 0.0;
    });
  }

  Widget hiAnimation() {
    return Align(
      alignment: Alignment(-0.5, 0.7),
      child: Transform(
        transform: Matrix4.identity()..setRotationX(135),
        child: Transform(
          transform: Matrix4.rotationZ(animateHandHi),
          alignment: Alignment.topLeft,
          child: Image.network(
            baseUrl + baseRepo + 'left_arm.png?alt=media',
            width: 180,
          ),
        ),
      ),
    );
  }

  Widget hideLeftAnimation() {
    return Align(
      alignment: Alignment(-0.5, 0.7),
      child: Transform(
        transform: Matrix4.identity()..setRotationX(135),
        child: Transform(
          transform: Matrix4.rotationZ(-0.25),
          alignment: Alignment.topLeft,
          child: Image.network(
            baseUrl + baseRepo + 'left_arm.png?alt=media',
            width: 180,
          ),
        ),
      ),
    );
  }

  Widget hideRightAnimation() {
    return Align(
      alignment: Alignment(0.5, 0.7),
      child: Transform(
        transform: Matrix4.identity()..setRotationX(135),
        child: Transform(
          transform: Matrix4.rotationZ(animateHandHide),
          alignment: Alignment.topRight,
          child: Image.network(
            baseUrl + baseRepo + 'right_arm.png?alt=media',
            width: 180,
          ),
        ),
      ),
    );
  }

  Widget hideAnimation(bool leftArm) =>
      leftArm ? hideLeftAnimation() : hideRightAnimation();

  Widget leftArm() {
    return GestureDetector(
      onTap: () => _animateHi(),
      child: Align(
        alignment: Alignment(-0.5, 0.5),
        child: TweenAnimationBuilder<Matrix4>(
          duration: Duration(milliseconds: 500),
          tween: _armsOpen
              ? Matrix4Tween(
                  begin: Matrix4.rotationZ(-0.3),
                  end: Matrix4.rotationZ(0.0),
                )
              : Matrix4Tween(
                  begin: Matrix4.rotationZ(0.0),
                  end: Matrix4.rotationZ(-0.3),
                ),
          builder: (context, value, child) {
            return Transform(
              transform: value,
              child: child,
              alignment: Alignment.topRight,
            );
          },
          child: Image.network(
            baseUrl + baseRepo + 'left_arm.png?alt=media',
            width: 180,
          ),
        ),
      ),
    );
  }

  Widget rightArm() {
    return Align(
      alignment: Alignment(0.5, 0.5),
      child: TweenAnimationBuilder<Matrix4>(
        duration: Duration(milliseconds: 500),
        tween: _armsOpen
            ? Matrix4Tween(
                begin: Matrix4.rotationZ(0.3),
                end: Matrix4.rotationZ(0.0),
              )
            : Matrix4Tween(
                begin: Matrix4.rotationZ(0.0),
                end: Matrix4.rotationZ(0.3),
              ),
        builder: (context, value, child) {
          return Transform(
            transform: value,
            child: child,
          );
        },
        child: Image.network(
          baseUrl + baseRepo + 'right_arm.png?alt=media',
          width: 180,
        ),
      ),
    );
  }

  @override
  void initState() {
    super.initState();
    _hiController = AnimationController(
      vsync: this,
      duration: Duration(milliseconds: 500),
    );
    _hideController = AnimationController(
      vsync: this,
      duration: Duration(milliseconds: 500),
    );
  }

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

  @override
  Widget build(BuildContext context) {
    return Material(
      child: Stack(
        fit: StackFit.expand,
        children: [
          Image.network(
            baseUrl + baseRepo + 'forest.jpg?alt=media',
            fit: BoxFit.cover,
          ),
          Opacity(
            opacity: 0.6,
            child: Container(
              decoration: BoxDecoration(
                gradient: LinearGradient(
                  colors: [Color(0xFF512DA8), Color(0xFFF57C00)],
                  begin: Alignment.topCenter,
                  end: Alignment.bottomCenter,
                ),
              ),
            ),
          ),
          powered(),
          MouseRegion(
            onHover: (details) {
              setState(() {
                final size = context.size;
                final center = size.center(Offset.zero);
                hoverPos = Offset(
                  (details.position.dx - center.dx) / size.width,
                  (details.position.dy - center.dy) / size.height,
                );
              });
            },
            child: GestureDetector(
              onPanUpdate: (details) {
                setState(() {
                  final size = context.size;
                  final center = size.center(Offset.zero);
                  hoverPos = Offset(
                    (details.localPosition.dx - center.dx) / size.width,
                    (details.localPosition.dy - center.dy) / size.height,
                  );
                });
              },
              onPanEnd: (_) => setState(() => hoverPos = Offset.zero),
              onPanCancel: () => setState(() => hoverPos = Offset.zero),
              child: Transform.scale(
                scale: 0.8,
                child: FittedBox(
                  child: SizedBox(
                    height: 800,
                    width: 800,
                    child: GestureDetector(
                      behavior: HitTestBehavior.opaque,
                      onTap: () => _changeImage(),
                      child: Stack(
                        fit: StackFit.expand,
                        children: [
                          Image.network(
                              baseUrl + baseRepo + 'body.png?alt=media'),
                          Align(
                            alignment: Alignment(
                              hoverPos.dx * 0.1,
                              hoverPos.dy * 0.1 - 0.22,
                            ),
                            child: GestureDetector(
                              onTap: () => _animateHide(),
                              child: Row(
                                mainAxisSize: MainAxisSize.min,
                                children: [
                                  Image.network(eyesPath, width: 40),
                                  SizedBox(width: 120),
                                  Image.network(eyesPath, width: 40),
                                ],
                              ),
                            ),
                          ),
                          AnimatedAlign(
                            duration: Duration(milliseconds: 500),
                            alignment: Alignment(0.0, mouthLocation),
                            child: Image.network(
                              baseUrl + baseRepo + 'mouth.png?alt=media',
                              width: 60,
                            ),
                          ),
                          if (_leftArmAnim == ArmAnim.normal)
                            leftArm()
                          else if (_leftArmAnim == ArmAnim.hi)
                            hiAnimation()
                          else
                            hideAnimation(true),
                          if (_rightArmAnim == ArmAnim.normal)
                            rightArm()
                          else
                            hideAnimation(false),
                        ],
                      ),
                    ),
                  ),
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }
}