value property Null safety

String? value
final

Sets the value for the equal color mapping.

The shape or bubble will render in the specified color if the value returned in the MapShapeSource.shapeColorValueMapper or MapShapeSource.bubbleColorValueMapper is equal to this value.

late List<Model> _data;
late MapShapeSource _mapSource;

 @override
 void initState() {
   super.initState();

   _data = <Model>[
    Model('India', 280, "Low"),
    Model('United States of America', 190, "High"),
    Model('Pakistan', 37, "Low"),
   ];

   _mapSource = MapShapeSource.asset(
     "assets/world_map.json",
     shapeDataField: "name",
     dataCount: _data.length,
     primaryValueMapper: (int index) {
       return _data[index].country;
     },
     shapeColorValueMapper: (int index) {
        return _data[index].storage;
     },
     shapeColorMappers: [
        MapColorMapper(value: "Low", color: Colors.red),
        MapColorMapper(value: "High", color: Colors.green)
     ],
   );
 }

 @override
 Widget build(BuildContext context) {
   return SfMaps(
     layers: [
       MapShapeLayer(
         source: _mapSource,
       )
     ],
   );
 }

class Model {
 const Model(this.country, this.count, this.storage);

 final String country;
 final double count;
 final String storage;
}

See also:

Implementation

final String? value;