forked from MapComplete/MapComplete
64 lines
2.2 KiB
TypeScript
64 lines
2.2 KiB
TypeScript
import { UIEventSource } from "../UIEventSource"
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import LayoutConfig from "../../Models/ThemeConfig/LayoutConfig"
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import { LocalStorageSource } from "../Web/LocalStorageSource"
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import { QueryParameters } from "../Web/QueryParameters"
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/**
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* This actor is responsible to set the map location.
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* It will attempt to
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* - Set the map to the position as passed in by the query parameters (if available)
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* - Set the map to the position remembered in LocalStorage (if available)
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* - Set the map to the layout default
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*
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* Additionally, it will save the map location to local storage
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*/
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export default class InitialMapPositioning {
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public zoom: UIEventSource<number>
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public location: UIEventSource<{ lon: number; lat: number }>
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constructor(layoutToUse: LayoutConfig) {
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function localStorageSynced(
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key: string,
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deflt: number,
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docs: string
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): UIEventSource<number> {
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const localStorage = LocalStorageSource.Get(key)
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const previousValue = localStorage.data
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const src = UIEventSource.asFloat(
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QueryParameters.GetQueryParameter(key, "" + deflt, docs).syncWith(localStorage)
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)
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if (src.data === deflt) {
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const prev = Number(previousValue)
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if (!isNaN(prev)) {
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src.setData(prev)
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}
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}
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return src
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}
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// -- Location control initialization
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this.zoom = localStorageSynced(
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"z",
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layoutToUse?.startZoom ?? 1,
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"The initial/current zoom level"
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)
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const lat = localStorageSynced(
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"lat",
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layoutToUse?.startLat ?? 0,
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"The initial/current latitude"
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)
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const lon = localStorageSynced(
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"lon",
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layoutToUse?.startLon ?? 0,
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"The initial/current longitude of the app"
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)
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this.location = new UIEventSource({ lon: lon.data, lat: lat.data })
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this.location.addCallbackD((loc) => {
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lat.setData(loc.lat)
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lon.setData(loc.lon)
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})
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// Note: this syncs only in one direction
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}
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}
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