可以知道屏幕上显示的DraggableScrollableSheet的分数吗？

DraggableScrollableSheet(
  initialChildSize: 0.5,
  minChildSize: 0.2,
  maxChildSize: 0.8,
  builder: (BuildContext context, ScrollController scrollController) {
    return Container(
      color: Colors.white,
      child: Column(
        children: [
          Text(
            '分数：90',
            style: TextStyle(fontSize: 20),
          ),
          Expanded(
            child: ListView.builder(
              controller: scrollController,
              itemCount: 100,
              itemBuilder: (BuildContext context, int index) {
                return ListTile(
                  title: Text('Item $index'),
                );
              },
            ),
          ),
        ],
      ),
    );
  },
)