Tooltip do not showing if have a lot of series in a chart

Question

Hi.I'm trying to use tooltip with my charts, but I have a little problem:If use single tooltip I can see only a few tooltip, 7 more or less, with a charts with height 400, because more of these not stay in chart.If I increase height of chart, I can see more tooltip.If I use group tooltip I can see more, but always limited by height of chart.Is possible remove this limit and make that tooltip go outside chart?Thanks.

Yuvaraj Gajaraj · Answer

Hi Michele,Yes, in our chart tooltip, we have a builder property
in TooltipBehavior. With the help of this, you can show the customizable widget instead of the tooltip.
It will render outside the chart area if the customized widget height is
greater than the chart area. We have attached the UG and code snippet for your
reference to achieve your requirement.Code snippet:

tooltipBehavior: TooltipBehavior(
      enable: true,
      builder: (data, point, series, pointIndex, seriesIndex) {
        return Container(
       
    padding: const EdgeInsets.all(5),
       
    child: Text('${point.x} : ${point.y}', 
              style: TextStyle(color:
   Colors.white)),
        );
      })

UG: https://help.syncfusion.com/flutter/cartesian-charts/tooltip#tooltip-template
Regards,Yuvaraj.

Michele Ammendola · Answer

Thanks.You can write me an example that reproduce a similiar results with group tooltip?I attach an example.Thank youRegardsAttachment: Simulator_Screen_Shot__iPad_Pro_(9.7inch)__20220512_at_18.39.02.png_65fe611d.zip

Michele Ammendola · Answer

I wrong, I want use a trackball with groupAllPoints, but I want that I can go outside of chart. Thanks.Regards

Yuvaraj Gajaraj · Answer

Hi Michele,Currently, we have hidden the trackball tooltip when it
exceeds the height or width of the chart area, this is our current behavior it
is applicable for the trackball tooltip template too. So, we suggest you have
the trackball tooltip template size less than the chart area. If you have any
further queries, please get back to us.Regards,Yuvaraj.

Michele Ammendola · Answer

And
is there no way to overcome this problem?

If
I have many graphs asin the example shown, nothing is seen,and it
isnot positive, because if I raise the height it is not good for
every situation anyway.

Furthermore,
the height is compared to the size of the device, and therefore on a
Desktop it has a meaning that on a mobile phone is different, so if
on the desktop I can see them on the mobile it is not certain,and if
I have many points they may not be seen.What can you suggest to me? There are clearly
cases where we need to show a lot of dots on the screen ...
Thanks

Yuvaraj Gajaraj · Answer

Hi Michele,Currently, we don’t have support for displaying the tooltip
when it exceeds the height of the chart area. However, you can achieve this by
having a static container in the application either at the top/bottom of the
chart or you can have the container over some part of the chart area statically
and get the tooltip information from the onTrackballPositionChanging callback,
then display that information in that container. We have attached the UG for
the onTrackballPositionChanging callback below for your reference.UG: https://help.syncfusion.com/flutter/cartesian-charts/callbacks#ontrackballpositionchanging
And to hide the chart tooltip in the normal case (in case
you have a static tooltip as we suggested above), you can hide the tooltip by
passing the empty string to the label and header as in the below code snippet.
And before passing empty string, store the information from args.chartPointInfo.label and args.chartPointInfo.header
in a variable for further processing.Code snippet:

onTrackballPositionChanging: (TrackballArgs args) {
    args.chartPointInfo.label = '';
    args.chartPointInfo.header = '';
  },

Regards,Yuvaraj.