mapcomplete/UI/ShowDataLayer.ts

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/**
* The data layer shows all the given geojson elements with the appropriate icon etc
*/
import {UIEventSource} from "../Logic/UIEventSource";
import * as L from "leaflet"
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import "leaflet.markercluster"
import LayerConfig from "../Customizations/JSON/LayerConfig";
import State from "../State";
import LazyElement from "./Base/LazyElement";
import Hash from "../Logic/Web/Hash";
import {GeoOperations} from "../Logic/GeoOperations";
import FeatureInfoBox from "./Popup/FeatureInfoBox";
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import LayoutConfig from "../Customizations/JSON/LayoutConfig";
export default class ShowDataLayer {
private readonly _layerDict;
private readonly _leafletMap: UIEventSource<L.Map>;
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private readonly _onSelectedTrigger: any = {}; // osmId+geometry.type+matching_layer_id --> () => void
constructor(features: UIEventSource<{ feature: any, freshness: Date }[]>,
leafletMap: UIEventSource<L.Map>,
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layoutToUse: LayoutConfig) {
this._leafletMap = leafletMap;
const self = this;
let oldGeoLayer: L.Layer = undefined;
this._layerDict = {};
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for (const layer of layoutToUse.layers) {
this._layerDict[layer.id] = layer;
}
function update() {
if (features.data === undefined) {
return;
}
if (leafletMap.data === undefined) {
return;
}
const mp = leafletMap.data;
const feats = features.data.map(ff => ff.feature);
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let geoLayer = self.CreateGeojsonLayer(feats)
if (layoutToUse.clustering.minNeededElements <= features.data.length) {
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const cl = window["L"]; // This is a dirty workaround, the clustering plugin binds to the L of the window, not of the namespace or something
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const cluster = cl.markerClusterGroup({ disableClusteringAtZoom: layoutToUse.clustering.maxZoom });
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cluster.addLayer(geoLayer);
geoLayer = cluster;
}
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if (oldGeoLayer) {
mp.removeLayer(oldGeoLayer);
}
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mp.addLayer(geoLayer);
oldGeoLayer = geoLayer;
}
features.addCallbackAndRun(() => update());
leafletMap.addCallback(() => update());
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State.state.selectedElement.addCallback(feature => {
if(feature === undefined){
return;
}
const id = feature.properties.id+feature.geometry.type+feature._matching_layer_id;
const action = self._onSelectedTrigger[id];
if(action){
action();
}
});
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Hash.hash.addCallbackAndRun(id => {
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// This is a bit of an edge case: if the hash becomes an id to search, we have to show the corresponding popup
if(State.state.selectedElement !== undefined){
return; // Something is already selected, we don't have to apply this fix
}
const action = self._onSelectedTrigger[id];
if(action){
action();
}
})
update();
}
private createStyleFor(feature) {
const tagsSource = State.state.allElements.getEventSourceFor(feature);
// Every object is tied to exactly one layer
const layer = this._layerDict[feature._matching_layer_id];
return layer.GenerateLeafletStyle(tagsSource, layer._showOnPopup !== undefined);
}
private pointToLayer(feature, latLng): L.Layer {
// Leaflet cannot handle geojson points natively
// We have to convert them to the appropriate icon
// Click handling is done in the next step
const tagSource = State.state.allElements.addOrGetElement(feature)
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const layer: LayerConfig = this._layerDict[feature._matching_layer_id];
const style = layer.GenerateLeafletStyle(tagSource, !(layer.title === undefined && (layer.tagRenderings ?? []).length === 0));
return L.marker(latLng, {
icon: L.divIcon({
html: style.icon.html.Render(),
className: style.icon.className,
iconAnchor: style.icon.iconAnchor,
iconUrl: style.icon.iconUrl,
popupAnchor: style.icon.popupAnchor,
iconSize: style.icon.iconSize
})
});
}
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private postProcessFeature(feature, leafletLayer: L.Layer) {
const layer: LayerConfig = this._layerDict[feature._matching_layer_id];
if (layer.title === undefined && (layer.tagRenderings ?? []).length === 0) {
// No popup action defined -> Don't do anything
return;
}
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const popup = L.popup({
autoPan: true,
closeOnEscapeKey: true,
}, leafletLayer);
const tags = State.state.allElements.getEventSourceFor(feature);
const uiElement: LazyElement = new LazyElement(() => new FeatureInfoBox(tags, layer),
"<div style='height: 90vh'>Rendering</div>");
popup.setContent(uiElement.Render());
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popup.on('remove', () => {
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if(!popup.isOpen()){
return;
}
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State.state.selectedElement.setData(undefined);
});
leafletLayer.bindPopup(popup);
// We first render the UIelement (which'll still need an update later on...)
// But at least it'll be visible already
leafletLayer.on("click", (e) => {
// We set the element as selected...
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uiElement.Activate();
State.state.selectedElement.setData(feature);
});
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const id = feature.properties.id+feature.geometry.type+feature._matching_layer_id;
this._onSelectedTrigger[id]
= () => {
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if(popup.isOpen()){
return;
}
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leafletLayer.openPopup();
uiElement.Activate();
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State.state.selectedElement.setData(feature);
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}
this._onSelectedTrigger[feature.properties.id.replace("/","_")] = this._onSelectedTrigger[id];
if (feature.properties.id.replace(/\//g, "_") === Hash.hash.data) {
// This element is in the URL, so this is a share link
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// We open the relevant popup straight away
uiElement.Activate();
popup.setContent(uiElement.Render());
const center = GeoOperations.centerpoint(feature).geometry.coordinates;
popup.setLatLng({lat: center[1], lng: center[0]});
popup.openOn(State.state.leafletMap.data);
State.state.selectedElement.setData(feature);
uiElement.Update();
}
}
private CreateGeojsonLayer(features: any[]): L.Layer {
const self = this;
const data = {
type: "FeatureCollection",
features: features
}
return L.geoJSON(data, {
style: feature => self.createStyleFor(feature),
pointToLayer: (feature, latLng) => self.pointToLayer(feature, latLng),
onEachFeature: (feature, leafletLayer) => self.postProcessFeature(feature, leafletLayer)
});
}
}