Flutter：如何创建固定第一列的水平滚动表？

Question

我是Flutter的新手。我需要修复表格中的第一列。我看到了这个主题：How to create a horizontally scrolling table with fixed column in Flutter?，但是我不知道如何对我的代码应用答案。我尝试这样做，但是看到错误。代码：

class DataTableWidget extends StatefulWidget {
  @override
  DataTableWidgetState createState() => DataTableWidgetState();
}

class DataTableWidgetState extends State<DataTableWidget> {
  bool ascending;

  @override
  void initState() {
    super.initState();

    ascending = false;
  }

  @override
  Widget build(BuildContext context) {
    final width = MediaQuery.of(context).size.width;
    return Scaffold(
      body: SingleChildScrollView(
        scrollDirection: Axis.horizontal,
        child: SizedBox(
          width: width * 1.4,
          child: ListView(
            children: <Widget>[
              buildDataTable(),
              Flexible(  //after I added flexible class, I see Errors
                  child: SingleChildScrollView(
                      scrollDirection: Axis.horizontal,
                      child: buildDataTable())),
            ],
          ),
        ),
      ),
    );
  }

  Widget buildDataTable() => DataTable(
...