How to customize caption row height in Flutter DataTable?

In this article, we will show how to customize caption row height in Flutter DataTable.

Initialize the SfDataGrid widget with the required properties. To customize the height of the CaptionSummaryRow when grouping, handle the onQueryRowHeight callback. By default, the CaptionSummaryRow uses the height specified in the SfDataGrid.rowHeight property. To override this, check if the current row is a caption summary row using the getRowDetails method from the controller within the onQueryRowHeight callback, and assign the appropriate height accordingly.

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Syncfusion Flutter DataGrid')),
      body: SfDataGrid(
        source: employeeDataSource,
        controller: _dataGridController,
        allowExpandCollapseGroup: true,
        columnWidthMode: ColumnWidthMode.fill,
        gridLinesVisibility: GridLinesVisibility.both,
        headerGridLinesVisibility: GridLinesVisibility.both,
        onQueryRowHeight: (details) {
          DataGridRowDetails? rowDetails =
                    _dataGridController.getRowDetails(details.rowIndex);
          if (rowDetails != null && rowDetails.rowType == RowType.captionSummaryCoveredRow) {
                return 90.0;
          }
          return details.rowHeight;
        },
        columns: <GridColumn>[
          GridColumn(
            columnName: 'id',
            label: Container(
              padding: EdgeInsets.all(16.0),
              alignment: Alignment.center,
              child: Text('ID'),
            ),
          ),
          GridColumn(
            columnName: 'name',
            label: Container(
              padding: EdgeInsets.all(8.0),
              alignment: Alignment.center,
              child: Text('Name'),
            ),
          ),
          GridColumn(
            columnName: 'designation',
            label: Container(
              padding: EdgeInsets.all(8.0),
              alignment: Alignment.center,
              child: Text('Designation', overflow: TextOverflow.ellipsis),
            ),
          ),
          GridColumn(
            columnName: 'salary',
            label: Container(
              padding: EdgeInsets.all(8.0),
              alignment: Alignment.center,
              child: Text('Salary'),
            ),
          ),
        ],
      ),
    );
  }

You can download this example on GitHub.

Conclusion
I hope you enjoyed learning about how to customize caption row height in Flutter DataTable.

You can refer to our Flutter DataTable feature tour page to know about its other groundbreaking feature representations and documentation, and how to quickly get started for configuration specifications. You can also explore our Flutter DataTable example to understand how to create and manipulate data.
​
For current customers, you can check out our components from the License and Downloads page. If you are new to Syncfusion®, you can try our 30-day free trial to check out our other controls.
​
If you have any queries or require clarifications, please let us know in the comments section below. You can also contact us through our support forums, Direct-Trac, or feedback portal. We are always happy to assist you!