forked from lxm_flutter/FlutterUnit
39 lines
1.1 KiB
Dart
39 lines
1.1 KiB
Dart
import 'package:flutter/material.dart';
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/// create by 张风捷特烈 on 2020/5/3
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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": 202,
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// "name": 'Builder的使用',
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// "priority": 1,
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// "subtitle": "【builder】 : 组件构造器 【WidgetBuilder】\n"
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// "同一个类中使用`XXX.of(context)`获取某类状态对象方法会存在`上下文滞后`的错误，使用Builder解决。",
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// }
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class BuilderDemo extends StatelessWidget {
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const BuilderDemo({Key? key}) : super(key: key);
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@override
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Widget build(BuildContext context) {
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return SizedBox(
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height: 200,
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child: Scaffold(
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appBar: AppBar(
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title: const Text('Builder'),
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),
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floatingActionButton: Builder(
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builder: (ctx) => FloatingActionButton(
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onPressed: () {
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Scaffold.of(ctx)
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.showSnackBar(const SnackBar(content: Text('hello builder')));
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},
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child: const Icon(Icons.add),
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),
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),
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),
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);
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}
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}
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