44 lines
1.8 KiB
TypeScript
44 lines
1.8 KiB
TypeScript
import {UIEventSource} from "../UIEventSource";
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import BaseLayer from "../../Models/BaseLayer";
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import AvailableBaseLayers from "./AvailableBaseLayers";
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import Loc from "../../Models/Loc";
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/**
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* Sets the current background layer to a layer that is actually available
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*/
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export default class LayerResetter {
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constructor( currentBackgroundLayer: UIEventSource<BaseLayer>,
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location: UIEventSource<Loc>,
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availableLayers: UIEventSource<BaseLayer[]>,
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defaultLayerId: UIEventSource<string> = undefined) {
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defaultLayerId = defaultLayerId ?? new UIEventSource<string>(AvailableBaseLayers.osmCarto.id);
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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.addCallbackAndRun(availableLayers => {
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let defaultLayer = undefined;
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const currentLayer = currentBackgroundLayer.data.id;
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for (const availableLayer of availableLayers) {
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if (availableLayer.id === currentLayer) {
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if (availableLayer.max_zoom < location.data.zoom) {
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break;
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}
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if (availableLayer.min_zoom > location.data.zoom) {
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break;
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}
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if(availableLayer.id === defaultLayerId.data){
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defaultLayer = availableLayer;
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}
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return; // All good - the current layer still works!
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}
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}
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// Oops, we panned out of range for this layer!
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console.log("AvailableBaseLayers-actor: detected that the current bounds aren't sufficient anymore - reverting to OSM standard")
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currentBackgroundLayer.setData(defaultLayer ?? AvailableBaseLayers.osmCarto);
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});
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}
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} |