mapbox / mapbox/mapbox-maps-flutter

Tapping on an unclustered layer item when using clusters

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Dominant language
Dart
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Description

Has anyone found out a way when using clustering to be able to tap a unclustered item? I have tried everything and I can't figure out how to be able to make it so I can attach a method to a circle that is unclustered? I don't see a way to add clustering to point annotations I have tried but I am unable to get it to work for only the unclustered items of a group.

IMG_8287

Here is my code:

void _addGeoJsonSourceWithClustering() async {
  final mapClusterProvider = Provider.of<MapClusterProvider>(context, listen: false);
  final geoJson = mapClusterProvider.createGeoJson();

  String sourceId = "data";
  Map<String, dynamic> sourceData = {
    "type": "geojson",
    "data": json.decode(geoJson),
    "cluster": true,
    "clusterRadius": 50,
    "clusterMaxZoom": 14,
  };

  String encodedSourceData = jsonEncode(sourceData);

  if (!(await mapboxMap?.style.styleSourceExists(sourceId) ?? true)) {
    await mapboxMap?.style.addStyleSource(sourceId, encodedSourceData);
    print('"data" source added to the map style');
    _addClusteringLayers(sourceId);
  }
}
void _addClusteringLayers(String sourceId) async {
  // Add clusters layer
  var layer = '''
    {
      "id": "clusters",
      "type": "circle",
      "source": "$sourceId",
      "filter": ["has", "point_count"],
      "paint": {
        "circle-color": [
          "step",
          ["get", "point_count"],
          "#51bbd6",
          100,
          "#f1f075",
          750,
          "#f28cb1"
        ],
        "circle-radius": [
          "step",
          ["get", "point_count"],
          20,
          100,
          30,
          750,
          40
        ]
      }
    }
  ''';
  await mapboxMap?.style.addStyleLayer(layer, null);
  print('"clusters" layer added to the map style');

  // Add cluster count layer
  var clusterCountLayer = '''
    {
      "id": "cluster-count",
      "type": "symbol",
      "source": "$sourceId",
      "filter": ["has", "point_count"],
      "layout": {
        "text-field": "{point_count_abbreviated}",
        "text-font": ["DIN Offc Pro Medium", "Arial Unicode MS Bold"],
        "text-size": 12
      }
    }
  ''';
  await mapboxMap?.style.addStyleLayer(clusterCountLayer, null);
  print('"cluster-count" layer added to the map style');

  // Add unclustered point layer
  var unclusteredLayer = '''
    {
      "id": "unclustered-point",
      "type": "circle",
      "source": "$sourceId",
      "filter": ["!", ["has", "point_count"]],
      "paint": {
        "circle-color": "#f62323",
        "circle-radius": 40,
        "circle-stroke-width": 1,
        "circle-stroke-color": "#fff"
      }
    }
  ''';
  await mapboxMap?.style.addStyleLayer(unclusteredLayer, null);
  print('"unclustered-point" layer added to the map style');
}

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by tracing _addGeoJsonSourceWithClustering and _addClusteringLayers, especially the unclustered-point layer and its source/filter configuration. Check how this Flutter Mapbox setup exposes layer interaction, then verify that an unclustered item can trigger the intended tap behavior without affecting clustered items.

Written by the indexing model from the issue text.

Assessment

Tech stack
dart, flutter
Domain
mobile-dev
Issue type
Feature
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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