如何更改PaginatedDataTable上的列宽？

class CustomDataTableSource extends DataTableSource {
  // 实现 DataTableSource 接口的相关方法
  // ...
}

class CustomPaginatedDataTable extends StatefulWidget {
  @override
  _CustomPaginatedDataTableState createState() =>
      _CustomPaginatedDataTableState();
}

class _CustomPaginatedDataTableState extends State<CustomPaginatedDataTable> {
  final CustomDataTableSource _data = CustomDataTableSource();

  @override
  Widget build(BuildContext context) {
    return PaginatedDataTable(
      header: Text('表格标题'),
      columns: [
        DataColumn(
          label: Text('列1'),
          tooltip: '列1的提示信息',
          numeric: false,
          onSort: (int columnIndex, bool ascending) {
            // 处理排序逻辑
          },
        ),
        DataColumn(
          label: Text('列2'),
          tooltip: '列2的提示信息',
          numeric: true,
          onSort: (int columnIndex, bool ascending) {
            // 处理排序逻辑
          },
        ),
        // 添加更多的 DataColumn
      ],
      source: _data,
      // 其他属性设置
    );
  }
}