explodeGesture property
Gesture for activating the explode.
Explode can be activated in ActivationMode.none,
ActivationMode.singleTap, ActivationMode.doubleTap,
and ActivationMode.longPress.
Defaults to ActivationMode.singleTap.
Also refer ActivationMode.
Widget build(BuildContext context) {
   return Container(
       child: SfCircularChart(
           series: <DoughnutSeries<ChartData, String>>[
               DoughnutSeries<ChartData, String>(
                 explode: true,
                 explodeGesture: ActivationMode.singleTap
               ),
           ],
       )
   );
}
Implementation
final ActivationMode explodeGesture;