如何将widget的索引值传递给父widget

// 子widget
class ChildWidget extends StatelessWidget {
  final int index;
  final Function(int) onIndexSelected;

  ChildWidget({required this.index, required this.onIndexSelected});

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: () {
        // 当子widget被点击时，调用回调函数将索引值传递给父widget
        onIndexSelected(index);
      },
      child: Container(
        // 子widget的内容
      ),
    );
  }
}

// 父widget
class ParentWidget extends StatefulWidget {
  @override
  _ParentWidgetState createState() => _ParentWidgetState();
}

class _ParentWidgetState extends State<ParentWidget> {
  int selectedIndex = 0;

  void handleIndexSelected(int index) {
    setState(() {
      selectedIndex = index;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        // 父widget的其他内容
        ChildWidget(
          index: 1,
          onIndexSelected: handleIndexSelected,
        ),
        ChildWidget(
          index: 2,
          onIndexSelected: handleIndexSelected,
        ),
        // 更多子widget...
      ],
    );
  }
}