首先是初始化：
查看Nativeshell的demo代码
// ignore_for_file: undefined_hidden_name, // not in main
import 'package:flutter/material.dart' hide MenuItem;
import 'package:nativeshell/nativeshell.dart';import 'pages/other_window.dart';
import 'pages/platform_channels.dart';
import 'main_window.dart';
import 'pages/modal_window.dart';
import 'widgets/veil.dart';void main() async {// Disable shader warmup - it delays producing first frame, which we want to// produce as soon as possible to reduce time to open new windows.disableShaderWarmUp();runApp(Main());
}// Common scaffold code used by each window
class ExamplesWindow extends StatelessWidget {const ExamplesWindow({Key? key, required this.child}) : super(key: key);final Widget child;@overrideWidget build(BuildContext context) {return MaterialApp(home: DefaultTextStyle(style: TextStyle(color: Colors.white,fontSize: 14,),child: WindowLayoutProbe(child: child),),);}
}class Main extends StatelessWidget {@overrideWidget build(BuildContext context) {return Veil(child: Container(color: Color.fromARGB(255, 30, 30, 35),child: WindowWidget(onCreateState: (initData) {WindowState? state;state ??= PlatformChannelsWindowState.fromInitData(initData);state ??= ModalWindowState.fromInitData(initData);state ??= OtherWindowState.fromInitData(initData);state ??= MainWindowState();return state;},),),);}
}
这里要注意 ??= 表示 state如果为null则赋值后面的值，否则返回state的自己的值
子窗口：
PlatformChannelsWindowState.fromInitData(initData);
ModalWindowState.fromInitData(initData);
OtherWindowState.fromInitData(initData);
主窗口：
MainWindowState();
其中initData为创建子窗口时传递过来的参数
initData['class'] 这个字段用于标识应该启动哪个子窗口
通过子窗口主动调用子窗口中的方法，并传参
await otherWindow?.callMethod('showMessage', 'Hello from parent window!');
通过父窗口调用父窗口中的方法，并传参
await Window.of(context).parentWindow?.callMethod('showMessage', 'Hello');
