[移动开发]Flutter封装wiget有公共点击事件或input输入事件处理给相对应的StatefulWidget

class A extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return AState();
  }
}

class AState extends State<A> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: button(onA),
    );
  }

  onA() {
    print('A');
  }
}

class B extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return BState();
  }
}

class BState extends State<B> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: button(onB),
    );
  }

  onB() {
    print('B');
  }
}

Widget button(Function() action) {
  return RaisedButton(
    onPressed: action,
    child: Text('点击'),
  );
}

下面是携带参数方法

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        title: 'Flutter Demo',
        theme: ThemeData(
          primarySwatch: Colors.blue,
        ),
        home: A());
  }
}

class A extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return AState();
  }
}

class AState extends State<A> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: button(onA),
    );
  }

  onA(a) {
    print(a);
    print('A');
  }
}

class B extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return BState();
  }
}

class BState extends State<B> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: button(onB),
    );
  }

  onB(v) {
    print('B');
  }
}

Widget button(action) {
  return RaisedButton(
    onPressed: () {
      return action('13');
    },
    child: Text('点击'),
  );
}