SfCartesianChart | Critical issue with onTrackballPositionChanging

[Jamesmallon1]

Hi there,

We use trackball within our charts but also use onTrackballPositionChanging to relay the current plot on the graph to the parent view to display the values of the chart as headers. On using setState or notifyListeners (from provider) within this method (onTrackballPositionChanging) the trackball line disappears and never appears again despite the values being relayed correctly.

I have tried to use select from provider to only listen to specific changes but the trackball still disappears. Additionally I am building the chart as part of a separate class but despite trying a huge amount as long as setState or notifyListeners is called in any parent widget whilst the trackball is displayed it will disappear.

This is obviously less than ideal, is there another solution or a workaround for now?

[Yuvaraj-Gajaraj]

Hi @Jamesmallon1,

We would like to let you know that the behavior of trackball activationMode is that it defines when the trackball comes to visibility, so if you rebuild the widget, it will not remain visible. We request that you share more details about your requirements. Based on your confirmation, we will try other possibilities to achieve your requirement.

Regards, Yuvaraj.