forked from MapComplete/MapComplete
45 lines
1.8 KiB
TypeScript
45 lines
1.8 KiB
TypeScript
import {Store, UIEventSource} from "../UIEventSource"
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import {Utils} from "../../Utils"
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import {RasterLayerPolygon, RasterLayerUtils,} from "../../Models/RasterLayers"
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/**
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* When a user pans around on the map, they might pan out of the range of the current background raster layer.
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* This actor will then quickly select a (best) raster layer of the same category which is available
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*/
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export default class BackgroundLayerResetter {
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constructor(
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currentBackgroundLayer: UIEventSource<RasterLayerPolygon>,
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availableLayers: Store<RasterLayerPolygon[]>
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) {
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if (Utils.runningFromConsole) {
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return
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}
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// Change the baseLayer back to OSM if we go out of the current range of the layer
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availableLayers.addCallbackAndRunD((availableLayers) => {
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// We only check on move/on change of the availableLayers
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const currentBgPolygon: RasterLayerPolygon | undefined = currentBackgroundLayer.data
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if (currentBackgroundLayer === undefined) {
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return
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}
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if (availableLayers.findIndex((available) => currentBgPolygon == available) >= 0) {
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// Still available!
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return
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}
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console.log("Current layer properties:", currentBgPolygon)
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// Oops, we panned out of range for this layer!
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// What is the 'best' map of the same category which is available?
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const availableInSameCat = RasterLayerUtils.SelectBestLayerAccordingTo(
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availableLayers,
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currentBgPolygon?.properties?.category
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)
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if(!availableInSameCat){
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return
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}
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console.log("Selecting a different layer:", availableInSameCat.properties.id)
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currentBackgroundLayer.setData(availableInSameCat)
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})
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}
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}
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