【Python】Flutter跨组件传递事件


步骤

1. 引入第三方库

pubspec.yaml 引入 event_bus: ^1.1.1

2. 定义在组件之间传递的对象

class UserInfo {

String nickname;

int level;

UserInfo(this.nickname, this.level);

}

3. 创建全局的EventBus对象

final eventBus = EventBus();

4. 在某个widget发出事件

FlatButton(

child: Text("Testbutton", style: TextStyle(color: Colors.white)),

color: Colors.orange, // 按钮的颜色

onPressed: () {

final info = UserInfo("why", 18);

eventBus.fire(info);

},

),

5. 在另一个widget监听事件

  @override

void initState() {

super.initState();

eventBus.on<UserInfo>().listen((data) {

setState(() {

message = "${data.nickname}-${data.level}";

});

});

}


完整代码

import 'package:flutter/material.dart';

import 'package:event_bus/event_bus.dart';

void main() {

runApp(MyApp());

}

class UserInfo {

String nickname;

int level;

UserInfo(this.nickname, this.level);

}

class MyApp extends StatelessWidget {

// This widget is the root of your application.

@override

Widget build(BuildContext context) {

return MaterialApp(

title: 'Flutter Demo',

theme: ThemeData(

primarySwatch: Colors.blue,

),

home: MyHomePage(title: 'Flutter Demo Home Page'),

);

}

}

class MyHomePage extends StatefulWidget {

MyHomePage({Key key, this.title}) : super(key: key);

final String title;

@override

_MyHomePageState createState() => _MyHomePageState();

}

class _MyHomePageState extends State<MyHomePage> {

final eventBus = EventBus();

String message = "Hello Coderwhy";

@override

void initState() {

super.initState();

eventBus.on<UserInfo>().listen((data) {

setState(() {

message = "${data.nickname}-${data.level}";

});

});

}

@override

Widget build(BuildContext context) {

return Scaffold(

appBar: AppBar(

title: Text(widget.title),

),

body: Center(

child: Column(

mainAxisAlignment: MainAxisAlignment.center,

children: <Widget>[

Text(

message,

style: Theme.of(context).textTheme.headline4,

),

FlatButton(

child: Text("Testbutton", style: TextStyle(color: Colors.white)),

color: Colors.orange, // 按钮的颜色

onPressed: () {

final info = UserInfo("why", 18);

eventBus.fire(info);

},

),

],

),

),

);

}

}


参考

【Python】Flutter跨组件传递事件

Flutter 写的app, 需要源码可以私信~~

  • 简繁火星字体转换
  • 哄女友神器
  • 号码测吉凶
  • 电视节目直播表


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