24 lines
917 B
TypeScript
24 lines
917 B
TypeScript
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/**
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* Every previously added point is remembered, but new points are added
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*/
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import FeatureSource from "./FeatureSource";
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import {UIEventSource} from "../UIEventSource";
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export default class RememberingSource implements FeatureSource{
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features: UIEventSource<{feature: any, freshness: Date}[]> = new UIEventSource<{feature: any, freshness: Date}[]>([]);
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constructor(source: FeatureSource) {
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const self = this;
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source.features.addCallbackAndRun(features => {
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if(features === undefined){
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return;
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}
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const ids = new Set<string>( features.map(f => f.feature.properties.id+f.feature.geometry.type));
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const newList = features.concat(
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self.features.data.filter(old => !ids.has(old.feature.properties.id+old.feature.geometry.type))
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)
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self.features.setData(newList);
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})
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}
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}
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