mapcomplete/Logic/Actors/SelectedFeatureHandler.ts

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import {UIEventSource} from "../UIEventSource";
import FeatureSource from "../FeatureSource/FeatureSource";
/**
* Makes sure the hash shows the selected element and vice-versa
*/
export default class SelectedFeatureHandler {
private readonly _featureSource: FeatureSource;
private readonly _hash: UIEventSource<string>;
private readonly _selectedFeature: UIEventSource<any>;
private static readonly _no_trigger_on = ["welcome","copyright","layers"]
constructor(hash: UIEventSource<string>,
selectedFeature: UIEventSource<any>,
featureSource: FeatureSource) {
this._hash = hash;
this._selectedFeature = selectedFeature;
this._featureSource = featureSource;
const self = this;
hash.addCallback(h => {
if (h === undefined || h === "") {
selectedFeature.setData(undefined);
}else{
self.selectFeature();
}
})
featureSource.features.addCallback(_ => self.selectFeature());
selectedFeature.addCallback(feature => {
if(feature === undefined){
if(SelectedFeatureHandler._no_trigger_on.indexOf(hash.data) < 0){
hash.setData("")
}
}
const h = feature?.properties?.id;
if(h !== undefined){
hash.setData(h)
}
})
this.selectFeature();
}
private selectFeature(){
const features = this._featureSource?.features?.data;
if(features === undefined){
return;
}
if(this._selectedFeature.data?.properties?.id === this._hash.data){
// Feature already selected
return;
}
const hash = this._hash.data;
if(hash === undefined || hash === "" || hash === "#"){
return;
}
for (const feature of features) {
const id = feature.feature?.properties?.id;
if(id === hash){
this._selectedFeature.setData(feature.feature);
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break;
}
}
}
}