@override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
          child: new ListView(
        children: <Widget>[
          new DataTable(columns: <DataColumn>[
            new DataColumn(
                label: new GestureDetector(
              onTap: () {},
              child: Text("报警时间"),
            )),
            new DataColumn(
                label: new GestureDetector(
              onTap: () {},
              child: Text("报警信息"),
            )),
          ], rows: <DataRow>[
            new DataRow(cells: <DataCell>[
              new DataCell(Text("棒材-粗轧轧机-主电机-前轴瓦-轴瓦温度过高,报警值41℃"), onTap: () {}),
              new DataCell(Text("2019/05/7 8:32:06"), onTap: () {}),
            ]),
            new DataRow(cells: <DataCell>[
              new DataCell(Text("棒材-粗轧轧机-主电机-前轴瓦-轴瓦温度过高,报警值41℃"), onTap: () {}),
              new DataCell(Text("2019/05/7 8:32:06"), onTap: () {}),
            ]),
          ])
        ],
      )),
    );
  }

Widget waringTable() => DataTable(
        columns: <DataColumn>[
          DataColumn(
            label: Text("报警时间"),
          ),
          DataColumn(
            label: Text("报警信息"),
          )
        ],
        rows: <DataRow>[
          DataRow(cells: <DataCell>[
            DataCell(Text("data")),
            DataCell(Text("data")),
          ])
        ],
      );

Widget waringTable() => DataTable(
        columns: <DataColumn>[
          DataColumn(
            label: Text("报警时间"),
          ),
          DataColumn(
            label: Text("报警信息"),
          )
        ],
        rows: datas.map((name)=>DataRow(
          cells: [
            DataCell(Text(name.time)),
            DataCell(Text(name.info))
          ]
        )).toList()
      );

class Name {
String time;
String info;
Name({this.time,this.info});
}

var names=<Name>[Name(time:"a",info:"b"),Name(time:"c",info:"d")];

Widget waringTable() => DataTable(
          columns: <DataColumn>[
            DataColumn(
              label: Text("报警时间", textAlign: TextAlign.right),
            ),
            DataColumn(
              label: Text("报警信息"),
            )
          ],
          rows: list
                  ?.map((name) => DataRow(cells: [
                        DataCell(Text(name.alarmTime, softWrap: true)),
                        DataCell(Text(name.alarmMsg, softWrap: true))
                      ]))
                  ?.toList() ??
              []);

class WaringDataSource extends DataTableSource {
  List<Name> _posts = list;
  int _selectedCount = 0;
  @override
  int get rowCount => _posts.length;

  @override
  bool get isRowCountApproximate => false;

  @override
  int get selectedRowCount => _selectedCount;

  @override
  DataRow getRow(int index) {
    Name name = _posts[index];
    return DataRow.byIndex(index: index, cells: <DataCell>[
      DataCell(Text(name.alarmMsg, softWrap: true)),
      DataCell(Text(name.alarmTime, softWrap: true)),
    ]);
  }
}

Widget waringTable() => PaginatedDataTable(
        header: Text(""),
        source: _waringSource,
        rowsPerPage: 5,
        columns: <DataColumn>[
          DataColumn(
            label: Text("报警信息"),
          ),
          DataColumn(
            label: Text("报警时间", textAlign: TextAlign.right),
          )
        ],
      );