Creating New Layers

Creating a new map layer is just as easy as it is to create a normal StatelessWidget or StatefulWidget.
Only one method call is needed to 'connect' the widget to the map state: FlutterMapState.maybeOf(). This call does two important things:
  • Cause the widget/layer to rebuild automatically when required (if in the build method)
  • Expose the map's internal state, meaning that it's information (such as zoom) can be accessed
You can see an example of how this is done below:
class CustomLayer extends StatelessWidget {
const CustomLayer({super.key});
Widget build(BuildContext context) {
final mapState = FlutterMapState.maybeOf(context)!;
// Use `mapState` as necessary, for example `mapState.zoom`
Attempting to use the widget above outside of a FlutterMap widget will result in an error.
The FlutterMapState.maybeOf method will return null, because it cannot locate a parent/inherited state, and therefore cause a null exception.
Last modified 3mo ago
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