onCrosshairPositionChanging property Null safety

ChartCrosshairCallback? onCrosshairPositionChanging
final

Occurs when tapping the axis label. Here, you can get the appropriate axis that is tapped and the axis label text.

Widget build(BuildContext context) {
   return Container(
       child: SfCartesianChart(
           crosshairBehavior: CrosshairBehavior(enable: true),
           onCrosshairPositionChanging: (CrosshairRenderArgs args) => crosshair(args)
       ));
}
void crosshair(CrosshairRenderArgs args) {
   args.text = 'crosshair';
}

Implementation

final ChartCrosshairCallback? onCrosshairPositionChanging;