mapcomplete/UI/ShowDataLayer.ts
2021-02-25 02:23:26 +01:00

190 lines
No EOL
7.1 KiB
TypeScript

/**
* The data layer shows all the given geojson elements with the appropriate icon etc
*/
import {UIEventSource} from "../Logic/UIEventSource";
import * as L from "leaflet"
import "leaflet.markercluster"
import LayerConfig from "../Customizations/JSON/LayerConfig";
import State from "../State";
import LazyElement from "./Base/LazyElement";
import FeatureInfoBox from "./Popup/FeatureInfoBox";
import LayoutConfig from "../Customizations/JSON/LayoutConfig";
import {GeoOperations} from "../Logic/GeoOperations";
export default class ShowDataLayer {
private _layerDict;
private readonly _leafletMap: UIEventSource<L.Map>;
constructor(features: UIEventSource<{ feature: any, freshness: Date }[]>,
leafletMap: UIEventSource<L.Map>,
layoutToUse: UIEventSource<LayoutConfig>) {
this._leafletMap = leafletMap;
const self = this;
const mp = leafletMap.data;
self._layerDict = {};
layoutToUse.addCallbackAndRun(layoutToUse => {
for (const layer of layoutToUse.layers) {
self._layerDict[layer.id] = layer;
}
});
let geoLayer = undefined;
let cluster = undefined;
function update() {
if (features.data === undefined) {
return;
}
if (leafletMap.data === undefined) {
return;
}
// clean all the old stuff away, if any
if (geoLayer !== undefined) {
mp.removeLayer(geoLayer);
}
if (cluster !== undefined) {
mp.removeLayer(cluster);
}
const allFeats = features.data.map(ff => ff.feature);
geoLayer = self.CreateGeojsonLayer();
for (const feat of allFeats) {
// @ts-ignore
geoLayer.addData(feat);
}
if (layoutToUse.data.clustering.minNeededElements <= allFeats.length) {
// Activate clustering if it wasn't already activated
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
cluster = cl.markerClusterGroup({disableClusteringAtZoom: layoutToUse.data.clustering.maxZoom});
cluster.addLayer(geoLayer);
mp.addLayer(cluster);
} else {
mp.addLayer(geoLayer)
}
State.state.selectedElement.ping();
}
features.addCallback(() => update());
leafletMap.addCallback(() => update());
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)
const layer: LayerConfig = this._layerDict[feature._matching_layer_id];
if (layer === undefined) {
return;
}
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
})
});
}
private postProcessFeature(feature, leafletLayer: L.Layer) {
const layer: LayerConfig = this._layerDict[feature._matching_layer_id];
if(layer === undefined){
console.warn("No layer found for object (probably a now disabled layer)", feature)
return;
}
if (layer.title === undefined && (layer.tagRenderings ?? []).length === 0) {
// No popup action defined -> Don't do anything
return;
}
const popup = L.popup({
autoPan: true,
closeOnEscapeKey: true,
closeButton: false
}, leafletLayer);
const tags = State.state.allElements.getEventSourceFor(feature);
const uiElement = new LazyElement(() => {
const infoBox = FeatureInfoBox.construct(tags, layer);
infoBox.isShown.addCallback(isShown => {
if(!isShown){
State.state.selectedElement.setData(undefined);
leafletLayer.closePopup();
popup.remove();
}
});
return infoBox;
},
"<div style='height: 50vh'>Rendering</div>"); // By setting 50vh, leaflet will attempt to fit the entire screen and move the feature down
popup.setContent(uiElement.Render());
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("popupopen", () => {
State.state.selectedElement.setData(feature);
uiElement.Activate();
})
State.state.selectedElement.addCallbackAndRun(selected => {
if (selected === undefined) {
if (popup.isOpen()) {
popup.remove();
}
} else if (selected == feature && selected.geometry.type === feature.geometry.type) {
// If wayhandling introduces a centerpoint and an area, this code might become unstable:
// The popup for the centerpoint would open, a bit later the area would close the first popup and open it's own
// In the process, the 'selectedElement' is set to undefined and to the other feature again, causing an infinite loop
// This is why we check for the geometry-type too
const mp = this._leafletMap.data;
if (!popup.isOpen() && mp !== undefined) {
popup
.setLatLng(GeoOperations.centerpointCoordinates(feature))
.openOn(mp);
uiElement.Activate();
}
}
}
);
}
private CreateGeojsonLayer(): L.Layer {
const self = this;
const data = {
type: "FeatureCollection",
features: []
}
return L.geoJSON(data, {
style: feature => self.createStyleFor(feature),
pointToLayer: (feature, latLng) => self.pointToLayer(feature, latLng),
onEachFeature: (feature, leafletLayer) => self.postProcessFeature(feature, leafletLayer)
});
}
}