forked from lxm_flutter/FlutterUnit
59 lines
1.3 KiB
Dart
59 lines
1.3 KiB
Dart
import 'package:flutter/material.dart';
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/// create by 张风捷特烈 on 2020/10/24
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/// contact me by email 1981462002@qq.com
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/// 说明:
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typedef FunNum1 = Function(double t);
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class MathRunner extends StatefulWidget {
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MathRunner({Key? key, this.child,required this.f,required this.g, this.reverse = true})
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: super(key: key);
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final Widget? child;
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final FunNum1 f;
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final FunNum1 g;
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final bool reverse;
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@override
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_MathRunnerState createState() => _MathRunnerState();
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}
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class _MathRunnerState extends State<MathRunner>
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with SingleTickerProviderStateMixin {
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late AnimationController _controller;
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late Animation<double> animationX;
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double _x = -1.0;
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double _y = 0;
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@override
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void initState() {
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_controller =
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AnimationController(vsync: this, duration: Duration(seconds: 3))..repeat(reverse: widget.reverse);
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animationX = Tween(begin: -1.0, end: 1.0).animate(_controller)
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..addListener(() {
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setState(() {
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_x = widget.f(animationX.value);
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_y = widget.g(animationX.value);
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});
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});
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super.initState();
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}
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@override
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void dispose() {
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_controller.dispose();
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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return Container(
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child: Align(
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alignment: Alignment(_x, _y),
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child: widget.child,
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)
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);
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}
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}
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