54 lines
1.9 KiB
TypeScript
54 lines
1.9 KiB
TypeScript
import FeatureSource from "./FeatureSource";
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import {UIEventSource} from "../UIEventSource";
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import LayerConfig from "../../Customizations/JSON/LayerConfig";
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import Loc from "../../Models/Loc";
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export default class FilteringFeatureSource implements FeatureSource {
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public features: UIEventSource<{ feature: any; freshness: Date }[]> = new UIEventSource<{ feature: any; freshness: Date }[]>([]);
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constructor(layers: {
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isDisplayed: UIEventSource<boolean>,
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layerDef: LayerConfig
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}[],
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location: UIEventSource<Loc>,
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upstream: FeatureSource) {
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const layerDict = {};
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const self = this;
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function update() {
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const features: { feature: any, freshness: Date }[] = upstream.features.data;
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const newFeatures = features.filter(f => {
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const layerId = f.feature._matching_layer_id;
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if (layerId === undefined) {
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console.error(f)
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throw "feature._matching_layer_id is undefined"
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}
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const layer: {
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isDisplayed: UIEventSource<boolean>,
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layerDef: LayerConfig
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} = layerDict[layerId];
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if (layer === undefined) {
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throw "No layer found with id " + layerId;
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}
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return layer.isDisplayed.data && (layer.layerDef.minzoom <= location.data.zoom);
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});
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self.features.setData(newFeatures);
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}
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for (const layer of layers) {
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layerDict[layer.layerDef.id] = layer;
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layer.isDisplayed.addCallback(() => {
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update()})
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}
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upstream.features.addCallback(() => {
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update()});
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location.map(l => l.zoom).addCallback(() => {
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update();});
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}
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} |