import 'package:flutter/material.dart';
/// create by 张风捷特烈 on 2020-04-19
/// contact me by email 1981462002@qq.com
/// 说明:

//    {
//      "widgetId": 89,
//      "name": 'FadeTransition基本使用',
//      "priority": 1,
//      "subtitle":
//          "【child】 : 孩子组件   【Widget】\n"
//          "【opacity】 : 动画   【Animation<double>】",
//    }
class CustomFadeTransition extends StatefulWidget {
  const CustomFadeTransition({Key? key}) : super(key: key);

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

class _CustomFadeTransitionState extends State<CustomFadeTransition>
    with SingleTickerProviderStateMixin {
 late AnimationController _ctrl;

  @override
  void initState() {
    _ctrl = AnimationController(
      vsync: this,
      duration: const Duration(seconds: 2),
    );
    _ctrl.forward();
    super.initState();
  }

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

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: () => _ctrl.forward(from: 0),
      child: Container(
        color: Colors.grey.withAlpha(22),
        width: 100,
        height: 100,
        child: FadeTransition(
          opacity: CurvedAnimation(parent: _ctrl, curve: Curves.linear),
          child: const Icon(Icons.android, color: Colors.green, size: 60),
        ),
      ),
    );
  }
}