forked from MapComplete/MapComplete
70 lines
2.4 KiB
TypeScript
70 lines
2.4 KiB
TypeScript
import { UIEventSource } from "../UIEventSource"
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import { GlobalFilter } from "../../Models/GlobalFilter"
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import FilteredLayer from "../../Models/FilteredLayer"
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import LayerConfig from "../../Models/ThemeConfig/LayerConfig"
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import { OsmConnection } from "../Osm/OsmConnection"
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/**
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* The layer state keeps track of:
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* - Which layers are enabled
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* - Which filters are used, including 'global' filters
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*/
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export default class LayerState {
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/**
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* Filters which apply onto all layers
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*/
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public readonly globalFilters: UIEventSource<GlobalFilter[]> = new UIEventSource(
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[],
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"globalFilters"
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)
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/**
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* Which layers are enabled in the current theme and what filters are applied onto them
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*/
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public readonly filteredLayers: Map<string, FilteredLayer>
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private readonly osmConnection: OsmConnection
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/**
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*
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* @param osmConnection
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* @param layers
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* @param context: the context, probably the name of the theme. Used to disambiguate the upstream user preference
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*/
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constructor(osmConnection: OsmConnection, layers: LayerConfig[], context: string) {
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this.osmConnection = osmConnection
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this.filteredLayers = new Map()
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for (const layer of layers) {
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this.filteredLayers.set(
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layer.id,
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FilteredLayer.initLinkedState(layer, context, this.osmConnection)
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)
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}
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layers.forEach((l) => this.linkFilterStates(l))
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}
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/**
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* Some layers copy the filter state of another layer - this is quite often the case for 'sibling'-layers,
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* (where two variations of the same layer are used, e.g. a specific type of shop on all zoom levels and all shops on high zoom).
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*
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* This methods links those states for the given layer
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*/
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private linkFilterStates(layer: LayerConfig) {
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if (layer.filterIsSameAs === undefined) {
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return
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}
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const toReuse = this.filteredLayers.get(layer.filterIsSameAs)
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if (toReuse === undefined) {
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throw (
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"Error in layer " +
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layer.id +
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": it defines that it should be use the filters of " +
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layer.filterIsSameAs +
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", but this layer was not loaded"
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)
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}
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console.warn(
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"Linking filter and isDisplayed-states of " + layer.id + " and " + layer.filterIsSameAs
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)
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this.filteredLayers.set(layer.id, toReuse)
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}
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}
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