Hibok/lib/home/coin_anim.dart

import 'package:chat/utils/MessageMgr.dart';
import 'package:flutter/material.dart';

import '../r.dart';

class CoinAnim extends StatefulWidget {
  @required
  final animFinishCallback;
  CoinAnim({Key key, @required this.animFinishCallback});
  @override
  _CoinAnimState createState() => _CoinAnimState();
}

class _CoinAnimState extends State<CoinAnim>
    with SingleTickerProviderStateMixin {
  Animation<double> _animation;
  AnimationController _controller;
  double begin = 10;
  double end = 2;

  @override
  void initState() {
    super.initState();
    // 启动动画controller
    _controller = new AnimationController(
        duration: Duration(milliseconds: 500), vsync: this);
    _controller.addStatusListener((AnimationStatus status) {
      setState(() {});
      if (status == AnimationStatus.completed) {
        widget.animFinishCallback();
        _controller.reverse();
      }
    });

    _animation = new Tween<double>(begin: begin, end: end).animate(_controller)
      ..addListener(() {
        setState(() {});
      });
    _controller.forward();
    MessageMgr().on('addCoin', msgAddCoin);
  }

  msgAddCoin(data) {
    _controller.forward();
  }

  @override
  void dispose() {
    _controller.stop();
    _controller.dispose();
    MessageMgr().off('addCoin', msgAddCoin);
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Container(
        margin: EdgeInsets.only(top: _animation.value),
        child: Opacity(
            opacity: 0.6,
            child: Container(
                height: 14,
                margin: EdgeInsets.only(left: 6),
                child: Image.asset(R.assetsImagesCoin))));
  }
}