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