forked from MapComplete/MapComplete
119 lines
4.3 KiB
TypeScript
119 lines
4.3 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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import { Tag } from "../Tags/Tag"
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import Translations from "../../UI/i18n/Translations"
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import { RegexTag } from "../Tags/RegexTag"
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import { Or } from "../Tags/Or"
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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: ReadonlyMap<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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const filteredLayers = new Map()
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for (const layer of layers) {
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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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this.filteredLayers = filteredLayers
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layers.forEach((l) => LayerState.linkFilterStates(l, filteredLayers))
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}
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/**
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* Sets the global filter which looks to the 'level'-tag.
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* Only features with the given 'level' will be shown.
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*
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* If undefined is passed, _all_ levels will be shown
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* @param level
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*/
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public setLevelFilter(level?: string) {
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// Remove all previous
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const l = this.globalFilters.data.length
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this.globalFilters.data = this.globalFilters.data.filter((f) => f.id !== "level")
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if (!level) {
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if (l !== this.globalFilters.data.length) {
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this.globalFilters.ping()
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}
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return
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}
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const t = Translations.t.general.levelSelection
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const conditionsOrred = [
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new Tag("level", "" + level),
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new RegexTag("level", new RegExp("(.*;)?" + level + "(;.*)?")),
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]
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if (level === "0") {
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conditionsOrred.push(new Tag("level", "")) // No level tag is the same as level '0'
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}
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console.log("Setting levels filter to", conditionsOrred)
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this.globalFilters.data.push({
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id: "level",
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state: level,
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osmTags: new Or(conditionsOrred),
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onNewPoint: {
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tags: [new Tag("level", level)],
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icon: "./assets/svg/elevator.svg",
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confirmAddNew: t.confirmLevel.PartialSubs({ level }),
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safetyCheck: t.addNewOnLevel.Subs({ level }),
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},
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})
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this.globalFilters.ping()
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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 static linkFilterStates(
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layer: LayerConfig,
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filteredLayers: Map<string, FilteredLayer>
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) {
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if (layer.filterIsSameAs === undefined) {
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return
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}
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const toReuse = 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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const copy = new FilteredLayer(layer, toReuse.appliedFilters, toReuse.isDisplayed)
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filteredLayers.set(layer.id, copy)
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}
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}
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