onTrackballPositionChanging property

ChartTrackballCallback? onTrackballPositionChanging
final

Occurs while the trackball position is changed. Here, you can customize the text of the trackball.

TrackballBehavior _trackballBehavior;

@override
void initState() {
 _trackballBehavior = TrackballBehavior( enable: true);
 super.initState();
}

Widget build(BuildContext context) {
   return Container(
       child: SfCartesianChart(
           trackballBehavior: _trackballBehavior,
           onTrackballPositionChanging: (TrackballArgs args) => trackball(args)
       )
   );
}
void trackball(TrackballArgs args) {
   args.chartPointInfo = ChartPointInfo();
}

Implementation

final ChartTrackballCallback? onTrackballPositionChanging;