forked from MapComplete/MapComplete
49 lines
1.9 KiB
TypeScript
49 lines
1.9 KiB
TypeScript
import { Store, UIEventSource } from "../UIEventSource"
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import { Feature } from "geojson"
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import { OsmConnection } from "../Osm/OsmConnection"
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import { GeoCodeResult } from "./GeocodingProvider"
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import { GeoOperations } from "../GeoOperations"
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import LayoutConfig from "../../Models/ThemeConfig/LayoutConfig"
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export class RecentSearch {
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private readonly _recentSearches: UIEventSource<string[]>
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public readonly recentSearches: Store<string[]>
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private readonly _seenThisSession: UIEventSource<GeoCodeResult[]> = new UIEventSource<GeoCodeResult[]>([])
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public readonly seenThisSession: Store<GeoCodeResult[]> = this._seenThisSession
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constructor(state: { layout: LayoutConfig, osmConnection: OsmConnection, selectedElement: Store<Feature> }) {
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const longPref = state.osmConnection.preferencesHandler.GetLongPreference("recent-searches")
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this._recentSearches = longPref.sync(str => !str ? [] : <string[]>JSON.parse(str), [], strs => JSON.stringify(strs))
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this.recentSearches = this._recentSearches
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state.selectedElement.addCallbackAndRunD(selected => {
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const [osm_type, osm_id] = selected.properties.id.split("/")
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const [lon, lat] = GeoOperations.centerpointCoordinates(selected)
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const entry = <GeoCodeResult> {
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feature: selected,
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osm_id, osm_type,
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description: "Viewed recently",
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lon, lat
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}
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this.addSelected(entry)
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})
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}
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addSelected(entry: GeoCodeResult) {
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const arr = [...this.seenThisSession.data.slice(0, 20), entry]
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const seenIds = new Set<string>()
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for (let i = arr.length - 1; i >= 0; i--) {
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const id = arr[i].osm_type + arr[i].osm_id
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if (seenIds.has(id)) {
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arr.splice(i, 1)
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} else {
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seenIds.add(id)
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}
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}
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this._seenThisSession.set(arr)
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}
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}
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