Flutter DataTable 删除额外的填充

Question

我想在 a 中显示一些数据DataTable，我有 9 列，除了第一列之外，所有列都是数字。

我遇到的问题是，我只看到前 5 列，不是因为数据太长，而是因为每列之间有很多空间。

有没有办法让 DataColumn 用我选择的填充来包装数据？这是我的代码：

Scaffold(
  appBar: AppBar(
    title: Text('DataTable Sample'),
  ),
  body: Container(
    child: DataTable(columns: <DataColumn>[
          DataColumn(
            label: Text('Name'),
          ),
          DataColumn(
            label: Text('A'),
          ),
          DataColumn(
            label: Text('B'),
          ),
          DataColumn(
            label: Text('C'),
          ),
          DataColumn(
            label: Text('D'),
          ),
          DataColumn(
            label: Text('E'),
          ),
          DataColumn(
            label: Text('F'),
          ),
          DataColumn(
            label: Text('G'),
          ),
          DataColumn(
            label: Text('H'),
          ),
        ], rows: <DataRow>[
          DataRow(cells: [
            DataCell(Text('1 Boston')),
            DataCell(Text('3')),
            DataCell(Text('3')),
            DataCell(Text('7')),
            DataCell(Text('1')),
            DataCell(Text('30')),
            DataCell(Text('8')),
            DataCell(Text('+2')),
            DataCell(Text('-22')),
          ]),
          DataRow(cells: [
            DataCell(Text('2 London')),
            DataCell(Text('3')),
            DataCell(Text('4')),
            DataCell(Text('12')),
            DataCell(Text('44')),
            DataCell(Text('7')),
            DataCell(Text('44')),
            DataCell(Text('-98')),
            DataCell(Text('0')),
          ]),
          DataRow(cells: [
            DataCell(Text('3 Rome')),
            DataCell(Text('10')),
            DataCell(Text('50')),
            DataCell(Text('90')),
            DataCell(Text('4')),
            DataCell(Text('7')),
            DataCell(Text('33')),
            DataCell(Text('+5')),
            DataCell(Text('-61')),
          ]),
        ]
        )
  ),
);

Answer 1

尝试设置horizontalMargin为 0，因为该值默认为 24​​.0：

...
数据表(
   水平边距：0，
   列间距：10，
   列： [
...

参考号 数据表horizo​​ntalMargin官方文档

Answer 2

是的。最近，flutter 团队合并了此 Widget 的更新。它现在仅在“主”频道（您可能处于“稳定”状态）中，切换运行flutter channel master然后flutter upgrade在终端中。这样做后，您可以通过设置 的columnSpacing参数来控制每列之间的空间DataTable。有关更多信息，请查看此已关闭问题

Answer 3

你可以使用SingleChildScrollViewandFittedBox作为它的父级。

Scaffold(
  appBar: AppBar(
    title: Text('DataTable Sample'),
  ),
  body: SingleChildScrollView(
    scrollDirection: Axis.vertical,
    child: FittedBox(
      child: DataTable(
        columns: <DataColumn>[
          DataColumn(
            label: Text('Name'),
          ),
          DataColumn(
            label: Text('A'),
          ),
          DataColumn(
            label: Text('B'),
          ),
          DataColumn(
            label: Text('C'),
          ),
          DataColumn(
            label: Text('D'),
          ),
          DataColumn(
            label: Text('E'),
          ),
          DataColumn(
            label: Text('F'),
          ),
          DataColumn(
            label: Text('G'),
          ),
          DataColumn(
            label: Text('H'),
          ),
        ],
        rows: <DataRow>[
          DataRow(cells: [
            DataCell(Text('1 Boston')),
            DataCell(Text('3')),
            DataCell(Text('3')),
            DataCell(Text('7')),
            DataCell(Text('1')),
            DataCell(Text('30')),
            DataCell(Text('8')),
            DataCell(Text('+2')),
            DataCell(Text('-22')),
          ]),
          DataRow(cells: [
            DataCell(Text('2 London')),
            DataCell(Text('3')),
            DataCell(Text('4')),
            DataCell(Text('12')),
            DataCell(Text('44')),
            DataCell(Text('7')),
            DataCell(Text('44')),
            DataCell(Text('-98')),
            DataCell(Text('0')),
          ]),
          DataRow(cells: [
            DataCell(Text('3 Rome')),
            DataCell(Text('10')),
            DataCell(Text('50')),
            DataCell(Text('90')),
            DataCell(Text('4')),
            DataCell(Text('7')),
            DataCell(Text('33')),
            DataCell(Text('+5')),
            DataCell(Text('-61')),
          ]),
        ],
      ),
    ),
  ),
);

Answer 4

您可以使用表而不是数据表。进一步参考视频。

您可以这样使用它：

Scaffold(
    appBar: AppBar(title: Text('DataTable Sample')),
    body: Container(
      child: Table(
        columnWidths: {0:FractionColumnWidth(.2)},
        children: [
        TableRow(
          children: [
            Text("Name",),
            Text("A",textAlign: TextAlign.center,),
            Text("B",textAlign: TextAlign.center,),
            Text("A",textAlign: TextAlign.center,),
            Text("B",textAlign: TextAlign.center,),
            Text("A",textAlign: TextAlign.center,),
            Text("B",textAlign: TextAlign.center,),
            Text("A",textAlign: TextAlign.center,),
            Text("B",textAlign: TextAlign.center,),
          ]
         ),
         TableRow(
          children: [
            Text("1 Boston",),
            Text('3',textAlign: TextAlign.center,),
            Text('3',textAlign: TextAlign.center,),
            Text('7',textAlign: TextAlign.center,),
            Text('1',textAlign: TextAlign.center,),
            Text('30',textAlign: TextAlign.center,),
            Text('8',textAlign: TextAlign.center,),
            Text('+2',textAlign: TextAlign.center,),
            Text('-22',textAlign: TextAlign.center,),
          ]
         ),
         TableRow(
          children: [
            Text('2 London',),
            Text('3',textAlign: TextAlign.center,),
            Text('4',textAlign: TextAlign.center,),
            Text('12',textAlign: TextAlign.center,),
            Text('44',textAlign: TextAlign.center,),
            Text('7',textAlign: TextAlign.center,),
            Text('44',textAlign: TextAlign.center,),
            Text('-98',textAlign: TextAlign.center,),
            Text('0',textAlign: TextAlign.center,),
          ]
         ),
        TableRow(
          children: [
              Text('3 Rome'),
              Text('10',textAlign: TextAlign.center,),
              Text('50',textAlign: TextAlign.center,),
              Text('90',textAlign: TextAlign.center,),
              Text('4',textAlign: TextAlign.center,),
              Text('7',textAlign: TextAlign.center,),
              Text('33',textAlign: TextAlign.center,),
              Text('+5',textAlign: TextAlign.center,),
              Text('-61',textAlign: TextAlign.center,),
          ]
         ),
        ]
      ),
    )
  ),