selectionGesture property

ActivationMode selectionGesture
final

Gesture for activating the selection. Selection can be activated in tap, double tap, and long press.

Defaults to ActivationMode.tap.

Also refer ActivationMode

Widget build(BuildContext context) {
   return Container(
       child: SfCartesianChart(
           selectionGesture: ActivationMode.doubleTap,
           series: <BarSeries<SalesData, num>>[
               BarSeries<SalesData, num>(
                 selectionSettings: SelectionSettings(
                   selectedColor: Colors.red,
                   unselectedColor: Colors.grey
                 ),
               ),
             ],
       ));
}

Implementation

final ActivationMode selectionGesture;