// main.dart
import 'package:flutter/material.dart';
import 'stateful.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData.light(),
      home: MyStatefulApp("Vava熊の一天")
    );
  }
}

//stateful.dart
import 'package:flutter/material.dart';
class MyStatefulApp extends StatefulWidget {
  String content;
  MyStatefulApp(this.content);
  @override
  State<StatefulWidget> createState() {
    return MyStatefulAppState();
  }
}
class MyStatefulAppState extends State<MyStatefulApp> {
  bool isShowText =true;
  void increment(){
    setState(() {
      widget.content += "赞";
    });
  }
  //build() 方法在 didChangeDependencies()（或者 didUpdateWidget() ）之后调用
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar:AppBar(
          title: Text('StatefulWidget及State'),
        ),
        body:Center(
          child: GestureDetector(
            child: isShowText? Text(widget.content) :null,
            onTap: increment,
           )
        )
    );
  }
  //-------only 生命周期 log------------
  //创建 State 对象后要调用的第一个方法
  @override
  void initState() {
    super.initState();
    print("initState");
    context.runtimeType;
  }
  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    print("didChangeDependencies");
  }
  //runtimeType 和 Widget.key 都一样，那么就会调用 didUpdateWidget()。
  @override
  void didUpdateWidget(MyStatefulApp oldWidget) {
    super.didUpdateWidget(oldWidget);
    print("didUpdateWidget");
  }
  // StaefulWidget 从树中移除时
  @override
  void dispose() {
    super.dispose();
    print("dispose");
  }
  //执行 HotReload，就会触发 reassemble()，这提供了重新初始化在 initState() 方法中准备的任何数据的机会，包括全局变量。
  @override
  void reassemble() {
    super.reassemble();
    print("reassemble");
  }
}

// 控制台日志
// 1.第一次 | 新打开
....
Restarted application in 1,153ms.
flutter: initState
flutter: didChangeDependencies
flutter: reassemble
flutter: didUpdateWidget
...
// 2.我们点击⚡️按钮热重载
...
Syncing files to device iPhone Xʀ...
flutter: reassemble
flutter: didUpdateWidget
...
// 3. 移除 widget
...
flutter: reassemble
flutter: dispose
Reloaded 2 of 442 libraries in 117ms.
...