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: UIEventSource<{ isDisplayed: UIEventSource, layerDef: LayerConfig }[]>, location: UIEventSource, upstream: FeatureSource) { const self = this; function update() { const layerDict = {}; for (const layer of layers.data) { layerDict[layer.layerDef.id] = layer; } console.log("Updating the filtering layer, input ", upstream.features.data.length, "features") const features: { feature: any, freshness: Date }[] = upstream.features.data; const newFeatures = features.filter(f => { const layerId = f.feature._matching_layer_id; if (layerId !== undefined) { const layer: { isDisplayed: UIEventSource, layerDef: LayerConfig } = layerDict[layerId]; if (layer === undefined) { console.error("No layer found with id ", layerId); return true; } if (FilteringFeatureSource.showLayer(layer, location)) { return true; } } // Does it match any other layer - e.g. because of a switch? for (const toCheck of layers.data) { if (!FilteringFeatureSource.showLayer(toCheck, location)) { continue; } if (toCheck.layerDef.source.osmTags.matchesProperties(f.feature.properties)) { return true; } } return false; }); console.log("Updating the filtering layer, output ", newFeatures.length, "features") self.features.setData(newFeatures); } 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.data.length; i++) { const layer = layers.data[i]; if (l.zoom < layer.layerDef.minzoom) { continue; } if(l.zoom > layer.layerDef.maxzoom){ continue; } if (!layer.isDisplayed.data) { continue; } displayedLayerIndexes.push(i); } return displayedLayerIndexes.join(",") }).addCallback(() => { update(); }); layers.addCallback(update); const registered = new Set>(); layers.addCallbackAndRun(layers => { for (const layer of layers) { if(registered.has(layer.isDisplayed)){ continue; } registered.add(layer.isDisplayed); layer.isDisplayed.addCallback(() => update()); } }) update(); } private static showLayer(layer: { isDisplayed: UIEventSource, layerDef: LayerConfig }, location: UIEventSource) { return layer.isDisplayed.data && (layer.layerDef.minzoom <= location.data.zoom) && (layer.layerDef.maxzoom >= location.data.zoom) } }