forked from lxm_flutter/FlutterUnit
117 lines
3.2 KiB
Dart
117 lines
3.2 KiB
Dart
import 'dart:developer';
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import 'dart:math';
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import 'package:flutter/material.dart';
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/// create by 张风捷特烈 on 2020-03-30
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/// contact me by email 1981462002@qq.com
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/// 说明:
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// {
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// "widgetId": 99,
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// "name": 'Flow圆形与动画结合',
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// "priority": 2,
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// "subtitle":
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// "通过动画来更改周围组件的位置实现效果",
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// }
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class BurstFlow extends StatefulWidget {
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static final data = List.generate(
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16,
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(index) => index.isEven
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? "assets/images/icon_head.webp"
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: "assets/images/wy_300x200.webp");
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static final show = Container(
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width: 300,
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height: 300,
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alignment: Alignment.center,
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child: BurstFlow(
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children: data
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.map((e) => CircleAvatar(backgroundImage: AssetImage(e)))
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.toList(),
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menu: CircleAvatar(
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backgroundImage: AssetImage('assets/images/icon_head.webp'),
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)));
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final List<Widget> children;
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final Widget menu;
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BurstFlow({required this.children, required this.menu});
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@override
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_BurstFlowState createState() => _BurstFlowState();
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}
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class _BurstFlowState extends State<BurstFlow>
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with SingleTickerProviderStateMixin {
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late AnimationController _controller;
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double _rad = 0.0;
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bool _closed = true;
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@override
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void initState() {
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_controller = AnimationController(
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duration: Duration(milliseconds: 1000), vsync: this)
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..addListener(() => setState(
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() => _rad = (_closed ? (_controller.value) : 1 - _controller.value)))
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..addStatusListener((status) {
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if (status == AnimationStatus.completed) {
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_closed = !_closed;
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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 Flow(
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delegate: _BurstFlowDelegate(_rad),
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children: [
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...widget.children,
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InkWell(
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onTap: () {
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_controller.reset();
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_controller.forward();
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},
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child: widget.menu)
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],
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);
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}
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}
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class _BurstFlowDelegate extends FlowDelegate {
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final double rad;
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_BurstFlowDelegate(this.rad);
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@override //绘制孩子的方法
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void paintChildren(FlowPaintingContext context) {
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double radius = context.size.shortestSide / 2;
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final int count = context.childCount - 1;
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final double perRad = 2 * pi / count;
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for (int i = 0; i < count; i++) {
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Size size = context.getChildSize(i) ?? Size.zero;
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final double offsetX = rad * (radius - size.width/2) * cos(i * perRad) + radius;
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final double offsetY = rad * (radius - size.height/2) * sin(i * perRad) + radius;
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context.paintChild(i,
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transform: Matrix4.translationValues(
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offsetX - size.width/2, offsetY - size.height/2, 0.0));
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}
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Size size = context.getChildSize(context.childCount - 1) ?? Size.zero;
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context.paintChild(context.childCount - 1,
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transform: Matrix4.translationValues(
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radius - size.width / 2, radius - size.height / 2, 0.0));
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}
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@override
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bool shouldRepaint(_BurstFlowDelegate oldDelegate) {
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return oldDelegate.rad != rad;
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}
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}
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