90 lines
3.5 KiB
TypeScript
90 lines
3.5 KiB
TypeScript
import { BBox } from "../BBox"
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import { Store } from "../UIEventSource"
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import ThemeViewState from "../../Models/ThemeViewState"
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import Constants from "../../Models/Constants"
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export type FeatureViewState =
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| "no-data"
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| "zoom-to-low"
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| "has-visible-feature"
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| "all-filtered-away"
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export default class NoElementsInViewDetector {
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public readonly hasFeatureInView: Store<FeatureViewState>
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constructor(themeViewState: ThemeViewState) {
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const state = themeViewState
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const minZoom = Math.min(
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...themeViewState.layout.layers
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.filter((l) => Constants.priviliged_layers.indexOf(<any>l.id) < 0)
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.map((l) => l.minzoom)
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)
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const mapProperties = themeViewState.mapProperties
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const priviliged: Set<string> = new Set(Constants.priviliged_layers)
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this.hasFeatureInView = state.mapProperties.bounds.stabilized(100).map(
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(bbox) => {
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if (mapProperties.zoom.data < minZoom) {
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// Not a single layer will display anything as the zoom is to low
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return "zoom-to-low"
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}
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for (const [layerName, source] of themeViewState.perLayerFiltered) {
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if (priviliged.has(layerName)) {
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continue
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}
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if (
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mapProperties.zoom.data < themeViewState.layout.getLayer(layerName).minzoom
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) {
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continue
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}
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if (!state.layerState.filteredLayers.get(layerName).isDisplayed.data) {
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continue
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}
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const feats = source.features.data
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if (!(feats?.length > 0)) {
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// Nope, no data loaded
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continue
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}
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for (const feat of feats) {
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if (BBox.get(feat).overlapsWith(bbox)) {
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// We found at least one item which has visible data
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return "has-visible-feature"
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}
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}
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}
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// If we arrive here, data might have been filtered away
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for (const [layerName, source] of themeViewState.perLayer) {
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if (priviliged.has(layerName)) {
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continue
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}
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if (
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mapProperties.zoom.data < themeViewState.layout.getLayer(layerName).minzoom
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) {
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continue
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}
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const feats = source.features.data
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if (!(feats?.length > 0)) {
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// Nope, no data loaded
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continue
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}
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for (const feat of feats) {
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if (BBox.get(feat).overlapsWith(bbox)) {
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// We found at least one item, but as we didn't find it before, it is filtered away
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return "all-filtered-away"
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}
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}
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}
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return "no-data"
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},
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[
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...Array.from(themeViewState.perLayerFiltered.values()).map((f) => f.features),
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mapProperties.zoom,
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...Array.from(state.layerState.filteredLayers.values()).map((fl) => fl.isDisplayed),
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]
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)
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}
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}
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