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