如何将索引从一个微件传递到flutter中的另一个微件

// 数据模型类
class IndexModel {
  int index;
  
  IndexModel(this.index);
}

// 发送方微件
class SenderWidget extends StatelessWidget {
  final Function callback;
  
  SenderWidget({this.callback});
  
  @override
  Widget build(BuildContext context) {
    return RaisedButton(
      onPressed: () {
        // 创建索引数据模型
        IndexModel indexModel = IndexModel(10);
        
        // 调用回调函数，并传递索引
        callback(indexModel);
      },
      child: Text('发送索引'),
    );
  }
}

// 接收方微件
class ReceiverWidget extends StatelessWidget {
  final Function callback;
  
  ReceiverWidget({this.callback});
  
  @override
  Widget build(BuildContext context) {
    return RaisedButton(
      onPressed: () {
        // 调用回调函数，并处理接收到的索引
        callback();
      },
      child: Text('接收索引'),
    );
  }
}

// 主微件
class MainWidget extends StatefulWidget {
  @override
  _MainWidgetState createState() => _MainWidgetState();
}

class _MainWidgetState extends State<MainWidget> {
  IndexModel receivedIndex;
  
  // 回调函数，用于接收索引
  void receiveIndex(IndexModel indexModel) {
    setState(() {
      receivedIndex = indexModel;
    });
  }
  
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('传递索引示例'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            SenderWidget(callback: receiveIndex),
            SizedBox(height: 20),
            ReceiverWidget(callback: () {
              // 处理接收到的索引
              if (receivedIndex != null) {
                print('接收到的索引：${receivedIndex.index}');
              }
            }),
          ],
        ),
      ),
    );
  }
}

void main() {
  runApp(MaterialApp(
    home: MainWidget(),
  ));
}