Expand DataTable to fill height in Flutter

问题

I have a problem with flutter. I need to fill a DataTable in the height of screen.

I tried to add the dataTable inside a Flex widget, but I don't get changes.

When I set the heigh of the Container, that's work let me a white space at the button of the screen

Thank you! and i'm sorry for mi poor english

This my code:

products.addAll(Product.getExampleList());

var table =

Container(
  child: SingleChildScrollView(
        scrollDirection: Axis.horizontal,
        child:SizedBox(
            child:
            Column(
              children: <Widget>[
                DataTable(
                    columns: <DataColumn>[
                      DataColumn(
                          label: Text("Código")
                      ),
                      DataColumn(
                        label: Text("Precio"),
                        numeric: true,
                      ),
                      DataColumn(
                          label: Text("Grupo")
                      ),
                      DataColumn(
                          label: Text("Descripción")
                      ),
                    ],
                    rows:
                    products.map<DataRow>((Product element) {
                      return DataRow(
                        key: Key(element.idProduct.toString()),
                        cells: <DataCell>[
                          DataCell(Text(element.code)),
                          DataCell(Text("\$ " + element.price.toStringAsFixed(2))),
                          DataCell(Text(element.group)),
                          DataCell(Text(element.description))
                        ],
                      );
                    }).toList()
                ),
              ],
            )
        ),
      ),
);


return  Container(
    color: Colors.white24,
    child:
      Column(
      children: <Widget>[
        Container(
          padding: EdgeInsets.all(10),
          child: Row(

            children: <Widget>[

              Text("Código: "),
              Flexible(
                child: TextField(
                  controller: tController,
                  decoration: InputDecoration(
                      hintText: "Ingrese Código"
                  ) ,
                ),
              ),
              RaisedButton(
                onPressed: onPressedSearch,
                child: Text("Buscar"),
              )
            ],
          ),
        ),
        Flex(
          direction: Axis.vertical,
          children: <Widget>[
            table
          ],
        ),
      ],
    )
);

回答1:

You can set the dataRowHeight and headingRowHeight properties of the DataTable to make its height equal to screen height.

your_number_of_rows = 4;
rowHeight = (MediaQuery.of(context).size.height - 56) / your_number_of_rows;

DataTable(dataRowHeight: rowHeight, headingRowHeight: 56.0, columns: ...)

来源：https://stackoverflow.com/questions/59921422/expand-datatable-to-fill-height-in-flutter