51 lines
1.6 KiB
TypeScript
51 lines
1.6 KiB
TypeScript
import BaseLayer from "../../Models/BaseLayer"
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import { ImmutableStore, Store, UIEventSource } from "../UIEventSource"
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import Loc from "../../Models/Loc"
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export interface AvailableBaseLayersObj {
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readonly osmCarto: BaseLayer
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layerOverview: BaseLayer[]
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AvailableLayersAt(location: Store<Loc>): Store<BaseLayer[]>
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SelectBestLayerAccordingTo(
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location: Store<Loc>,
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preferedCategory: Store<string | string[]>
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): Store<BaseLayer>
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}
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/**
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* Calculates which layers are available at the current location
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* Changes the basemap
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*/
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export default class AvailableBaseLayers {
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public static layerOverview: BaseLayer[]
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public static osmCarto: BaseLayer
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private static implementation: AvailableBaseLayersObj
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static AvailableLayersAt(location: Store<Loc>): Store<BaseLayer[]> {
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return (
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AvailableBaseLayers.implementation?.AvailableLayersAt(location) ??
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new ImmutableStore<BaseLayer[]>([])
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)
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}
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static SelectBestLayerAccordingTo(
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location: Store<Loc>,
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preferedCategory: UIEventSource<string | string[]>
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): Store<BaseLayer> {
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return (
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AvailableBaseLayers.implementation?.SelectBestLayerAccordingTo(
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location,
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preferedCategory
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) ?? new ImmutableStore<BaseLayer>(undefined)
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)
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}
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public static implement(backend: AvailableBaseLayersObj) {
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AvailableBaseLayers.layerOverview = backend.layerOverview
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AvailableBaseLayers.osmCarto = backend.osmCarto
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AvailableBaseLayers.implementation = backend
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}
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}
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