在Flutter中访问嵌套StreamBuilder内的流

Stream<int> getStream() {
  return Stream<int>.periodic(Duration(seconds: 1), (count) => count).take(5);
}

Widget build(BuildContext context) {
  return StreamBuilder<int>(
    stream: getStream(),
    builder: (context, snapshot) {
      if (snapshot.hasData) {
        return StreamBuilder<int>(
          stream: getNestedStream(snapshot.data),
          builder: (context, nestedSnapshot) {
            if (nestedSnapshot.hasData) {
              return Text('Nested Stream Data: ${nestedSnapshot.data}');
            } else if (nestedSnapshot.hasError) {
              return Text('Error: ${nestedSnapshot.error}');
            } else {
              return CircularProgressIndicator();
            }
          },
        );
      } else if (snapshot.hasError) {
        return Text('Error: ${snapshot.error}');
      } else {
        return CircularProgressIndicator();
      }
    },
  );
}

Stream<int> getNestedStream(int data) {
  return Stream<int>.periodic(Duration(seconds: 2), (count) => data * count).take(3);
}