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如何从'PaginatedDataTable'中获取当前正在查看的页面信息？

这是示例代码。

new PaginatedDataTable(
              header: const Text('Nutrition'),
              rowsPerPage: _rowsPerPage,
              onRowsPerPageChanged: (int value) {
                setState(() {
                  _rowsPerPage = value;
                });
              },
              sortColumnIndex: _sortColumnIndex,
              sortAscending: _sortAscending,
              onSelectAll: _dessertsDataSource._selectAll,
              columns: <DataColumn>[
                new DataColumn(....
              ],
              source: _dessertsDataSource)
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