forked from MapComplete/MapComplete
96 lines
No EOL
3.4 KiB
TypeScript
96 lines
No EOL
3.4 KiB
TypeScript
import {UIEventSource} from "../UIEventSource";
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import {OsmObject} from "../Osm/OsmObject";
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import Loc from "../../Models/Loc";
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import {ElementStorage} from "../ElementStorage";
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import FeaturePipeline from "../FeatureSource/FeaturePipeline";
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/**
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* Makes sure the hash shows the selected element and vice-versa.
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*/
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export default class SelectedFeatureHandler {
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private static readonly _no_trigger_on = new Set(["welcome", "copyright", "layers", "new", "", undefined])
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hash: UIEventSource<string>;
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private readonly state: {
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selectedElement: UIEventSource<any>
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}
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constructor(
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hash: UIEventSource<string>,
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state: {
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selectedElement: UIEventSource<any>,
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allElements: ElementStorage,
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featurePipeline: FeaturePipeline
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}
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) {
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this.hash = hash;
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this.state = state
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// If the hash changes, set the selected element correctly
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function setSelectedElementFromHash(h){
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if (h === undefined || h === "") {
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// Hash has been cleared - we clear the selected element
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state.selectedElement.setData(undefined);
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}else{
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// we search the element to select
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const feature = state.allElements.ContainingFeatures.get(h)
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if(feature !== undefined){
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state.selectedElement.setData(feature)
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}
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}
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}
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hash.addCallback(setSelectedElementFromHash)
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// IF the selected element changes, set the hash correctly
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state.selectedElement.addCallback(feature => {
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if (feature === undefined) {
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if (SelectedFeatureHandler._no_trigger_on.has(hash.data)) {
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hash.setData("")
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}
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}
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const h = feature?.properties?.id;
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if (h !== undefined) {
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hash.setData(h)
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}
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})
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state.featurePipeline.newDataLoadedSignal.addCallbackAndRunD(_ => {
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// New data was loaded. In initial startup, the hash might be set (via the URL) but might not be selected yet
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if(hash.data === undefined || SelectedFeatureHandler._no_trigger_on.has(hash.data)){
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// This is an invalid hash anyway
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return;
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}
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if(state.selectedElement.data !== undefined){
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// We already have something selected
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return;
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}
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setSelectedElementFromHash(hash.data)
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})
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}
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// If a feature is selected via the hash, zoom there
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public zoomToSelectedFeature(location: UIEventSource<Loc>) {
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const hash = this.hash.data;
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if (hash === undefined || SelectedFeatureHandler._no_trigger_on.has(hash)) {
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return; // No valid feature selected
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}
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// We should have a valid osm-ID and zoom to it... But we wrap it in try-catch to be sure
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try {
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OsmObject.DownloadObject(hash).addCallbackAndRunD(element => {
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const centerpoint = element.centerpoint();
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console.log("Zooming to location for select point: ", centerpoint)
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location.data.lat = centerpoint[0]
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location.data.lon = centerpoint[1]
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location.ping();
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})
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} catch (e) {
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console.error("Could not download OSM-object with id", hash, " - probably a weird hash")
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}
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}
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} |