Shape selection on maps stops working if the mapsource is a future

Question

In my MapShapeSublayer, when I update my mapsource property from

MapShapeSource myMapSource = MapShapeSource.asset(
  'assets/json_data/2_provincias.json',
  shapeDataField: 'Provincia',
  dataCount: provinciaKeys.length,
  primaryValueMapper: (int index) => provinciaKeys.entries.elementAt(index).key,
  shapeColorValueMapper: (int index) =>
      provinciaKeys[provinciaKeys.entries.elementAt(index).key]!.baseColor,
);

to

Future<MapShapeSource> myMapSource() async {
  return MapShapeSource.asset(
    'assets/json_data/2_provincias.json',
    shapeDataField: 'Provincia',
    dataCount: provinciaKeys.length,
    primaryValueMapper: (int index) =>
        provinciaKeys.entries.elementAt(index).key,
    shapeColorValueMapper: (int index) =>
        provinciaKeys[provinciaKeys.entries.elementAt(index).key]!.baseColor,
  );
}

then the select shape functionality seems to go haywire. Any ideas? I appreciate that the 2nd code snippet isn't really a future. But I will make it a proper future once I have resolved this issue. Many thanks!

Yuvaraj Gajaraj · Answer

Hi Steve,Greetings from Syncfusion. We like to let you know that in the map
it is already implemented with the FutureBuilder and the given MapShapeSource is converted to Future and for
selection we have use the setState() to perform selection, so you do not need
to pass the MapShapeSource as a Future. This is the reason the selection is not
working. So please try to avoid assigning the source value as
Future<MapShapeSource> instead of MapShapeSource.If you have any further queries, please get back to us.Regards,Yuvaraj.

Steve Monroe · Answer

Ok understood - thank you.What I really want to do is get my MapSource data from my Cloud Firestore database. My understanding is that retrieving data from Firebase always requires a future... so do you know if there any way to achieve this given the restriction you mention?Many thanks for your help!

Yuvaraj Gajaraj · Answer

Hi Steve,Thanks for your patience. We suggest you fetch the JSON data
from the firestore at the initState() itself then assign the JSON data to the
MapSource that would be the proper method of fetching data from the firestore.
If this is not your case, then please try to provide the data structure of your
firestore database and what the values are contained. That would be helpful to
us to provide a solution sooner.Regards,Yuvaraj.