import FeatureSource from "./FeatureSource"; import {UIEventSource} from "../UIEventSource"; import LayerConfig from "../../Customizations/JSON/LayerConfig"; import Loc from "../../Models/Loc"; export default class FilteringFeatureSource implements FeatureSource { public features: UIEventSource<{ feature: any; freshness: Date }[]> = new UIEventSource<{ feature: any; freshness: Date }[]>([]); constructor(layers: { isDisplayed: UIEventSource, layerDef: LayerConfig }[], location: UIEventSource, upstream: FeatureSource) { const layerDict = {}; const self = this; function update() { const features: { feature: any, freshness: Date }[] = upstream.features.data; const newFeatures = features.filter(f => { const layerId = f.feature._matching_layer_id; if (layerId === undefined) { console.error(f) throw "feature._matching_layer_id is undefined" } const layer: { isDisplayed: UIEventSource, layerDef: LayerConfig } = layerDict[layerId]; if (layer === undefined) { throw "No layer found with id " + layerId; } if (FilteringFeatureSource.showLayer(layer, location)) { return true; } // Does it match any other layer? for (const toCheck of layers) { if (!FilteringFeatureSource.showLayer(toCheck, location)) { continue; } if (toCheck.layerDef.overpassTags.matchesProperties(f.feature.properties)) { return true; } } return false; }); self.features.setData(newFeatures); } for (const layer of layers) { layerDict[layer.layerDef.id] = layer; } upstream.features.addCallback(() => { update() }); location.map(l => { // We want something that is stable for the shown layers const displayedLayerIndexes = []; for (let i = 0; i < layers.length; i++) { if (l.zoom < layers[i].layerDef.minzoom) { continue; } if (!layers[i].isDisplayed.data) { continue; } displayedLayerIndexes.push(i); } return displayedLayerIndexes.join(",") }, layers.map(l => l.isDisplayed)) .addCallback(() => { update(); }); } private static showLayer(layer: { isDisplayed: UIEventSource, layerDef: LayerConfig }, location: UIEventSource) { return layer.isDisplayed.data && (layer.layerDef.minzoom <= location.data.zoom) } }