Flutter事件监听与EventBus事件的应用详解

class _EventPointerDemoPageState extends State<EventPointerDemoPage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("事件监听"),
      ),
      body: Center(
          child: Listener(
        onPointerDown: (event) {
          // 相对于这个container 的 位置
          print(event.localPosition);
          // 相对于屏幕的位置
          print(event.position);
          // print("手指按下了$event");
        },
        onPointerMove: (event) {
          // print("手指移动了$event");
        },
        onPointerUp: (event) {
          // print("手指抬起了$event");
        },
        child: Container(
          width: 200,
          height: 200,
          color: Colors.redAccent,
        ),
      )),
    );
  }
}

_gestureDemo() {
    return GestureDetector(
      onTap: () {
        print("点击事件完成了");
      },
      onPanEnd: (details) {
        print(details);
      },
      onTapDown: (details) {
        // 相对于container
        print(details.localPosition);
        // 相对于屏幕的
        print(details.globalPosition);
      },
      onTapUp: (details) {
        // 抬起之后 才会调用 onTap ，证明点击事件完成了
        print("1111");
      },
      child: Container(
        width: 200,
        height: 200,
        color: Colors.blueAccent,
      ),
    );
  }

import "package:event_bus/event_bus.dart";
// 定义一个全局的eventBus
final eventBus = EventBus();
class MyEventMessage {
  String? name;
  String? action;
  MyEventMessage(this.name, this.action);
}

 return ElevatedButton(
        onPressed: () {
          print("点击事件");
          // 第二步fire
          eventBus.fire(MyEventMessage("leonardo", "hahaha"));
        },
        child: Text("改变文字"));
  }

 void initState() {
    // TODO: implement initState
    super.initState();
    // 第三步监听操作
    eventBus.on<MyEventMessage>().listen((event) {
      print(event.name);
      setState(() {
        _name = event.name!;
      });
    });
  }