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September 8, 2023 20:29
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import { useEffect, useRef } from 'react'; | |
import { FeatureModel } from '@luciad/ria/model/feature/FeatureModel.js'; | |
import { FeatureLayer } from '@luciad/ria/view/feature/FeatureLayer.js'; | |
import { MemoryStore } from '@luciad/ria/model/store/MemoryStore.js'; | |
import { useMap } from './MapContext'; | |
import { Feature } from '@luciad/ria/model/feature/Feature.js'; | |
import { CoordinateReference } from '@luciad/ria/reference/CoordinateReference.js'; | |
import { Shape } from '@luciad/ria/shape/Shape.js'; | |
type FeatureMap<S extends Shape> = Map<string | number, Feature<S>>; | |
export type PolylineMap = Map<string | number, [number, number][]>; | |
export default function createShapeLayerComponent<S extends Shape, D>( | |
createFeature: (reference: CoordinateReference, shapeData: D) => S | |
) { | |
return ({ shapes }: { shapes: Map<string | number, D> }) => { | |
const map = useMap(); | |
const layerRef = useRef<FeatureLayer | null>(null); | |
const featuresMapRef = useRef<FeatureMap<S>>(new Map()); | |
useEffect(() => { | |
if (!map) return; | |
if (!layerRef.current) { | |
const store = new MemoryStore<Feature<S>>(); | |
const model = new FeatureModel(store); | |
const layer = new FeatureLayer(model); | |
map.layerTree.addChild(layer, 'top'); | |
layerRef.current = layer; | |
} | |
shapes.forEach((shapeData, id) => { | |
const existingFeature = featuresMapRef.current.get(id); | |
if (existingFeature) { | |
const updatedShape = createFeature(map.reference, shapeData); | |
existingFeature.shape = updatedShape; | |
layerRef.current?.model.put(existingFeature); | |
} else { | |
const newShape = createFeature(map.reference, shapeData); | |
const newFeature = new Feature(newShape); | |
layerRef.current?.model.add(newFeature); | |
featuresMapRef.current.set(id, newFeature); | |
} | |
}); | |
featuresMapRef.current.forEach((feature, fid) => { | |
if (!shapes.has(fid)) { | |
layerRef.current!.model.remove(feature.id); | |
featuresMapRef.current.delete(fid); | |
} | |
}); | |
}, [map, shapes]); | |
useEffect(() => { | |
return () => { | |
if (layerRef.current) { | |
map && map.layerTree.removeChild(layerRef.current); | |
layerRef.current = null; | |
} | |
}; | |
}, [map]); | |
return null; | |
}; | |
} | |
const PolylineLayer = createShapeLayerComponent(createPolyline); | |
const PolygonLayer = createShapeLayerComponent(createPolygon); | |
const PointLayer = createShapeLayerComponent(createPoint); | |
// etc |
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