onZoomReset property

Occurs when zoomed state is reset. Here, you can get the axis, current zoom factor, current zoom position, previous zoom factor, and previous zoom position.

late ZoomPanBehavior _zoomPanBehavior;

@override
void initState() {
  _zoomPanBehavior = ZoomPanBehavior(enableSelectionZooming: true);
  super.initState();
 }

Widget build(BuildContext context) {
    return Container(
        child: SfCartesianChart(
            zoomPanBehavior: _zoomPanBehavior,
            onZoomReset: (ZoomPanArgs args) => zoom(args),
        )
    );
}
void zoom(ZoomPanArgs args) {
    print(args.currentZoomPosition);
}