selectionController property

RangeController selectionController
final

Controller used to set the maximum and minimum values for the chart.By providing the selection controller, the maximum and The minimum range of selected series or points can be customized

Widget build(BuildContext context) {
   return Container(
       child: SfCartesianChart(
           selectionBehavior: SelectionBehavior(
               selectionController:  controller,
              ),
       ));
}

Implementation

final RangeController selectionController;