mapcomplete/Logic/FilteredLayer.ts

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import { Basemap } from "./Basemap";
import { TagsFilter, TagUtils } from "./TagsFilter";
import { UIEventSource } from "../UI/UIEventSource";
import { ElementStorage } from "./ElementStorage";
import { Changes } from "./Changes";
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import L from "leaflet"
import { GeoOperations } from "./GeoOperations";
import { UIElement } from "../UI/UIElement";
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/***
* A filtered layer is a layer which offers a 'set-data' function
* It is initialized with a tagfilter.
*
* When geojson-data is given to 'setData', all the geojson matching the filter, is rendered on this layer.
* If it is not rendered, it is returned in a 'leftOver'-geojson; which can be consumed by the next layer.
*
* This also makes sure that no objects are rendered twice if they are applicable on two layers
*/
export class FilteredLayer {
public readonly name: string;
public readonly filters: TagsFilter;
public readonly isDisplayed: UIEventSource<boolean> = new UIEventSource(true);
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private readonly _map: Basemap;
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private readonly _maxAllowedOverlap: number;
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private readonly _style: (properties) => { color: string, icon: any };
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private readonly _storage: ElementStorage;
/** The featurecollection from overpass
*/
private _dataFromOverpass;
/** List of new elements, geojson features
*/
private _newElements = [];
/**
* The leaflet layer object which should be removed on rerendering
*/
private _geolayer;
private _selectedElement: UIEventSource<any>;
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private _showOnPopup: (tags: UIEventSource<any>) => UIElement;
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constructor(
name: string,
map: Basemap, storage: ElementStorage,
changes: Changes,
filters: TagsFilter,
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maxAllowedOverlap: number,
style: ((properties) => any),
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selectedElement: UIEventSource<any>,
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showOnPopup: ((tags: UIEventSource<any>) => UIElement)
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) {
this._selectedElement = selectedElement;
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this._showOnPopup = showOnPopup;
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if (style === undefined) {
style = function () {
return {};
}
}
this.name = name;
this._map = map;
this.filters = filters;
this._style = style;
this._storage = storage;
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this._maxAllowedOverlap = maxAllowedOverlap;
const self = this;
this.isDisplayed.addCallback(function (isDisplayed) {
if (self._geolayer !== undefined && self._geolayer !== null) {
if (isDisplayed) {
self._geolayer.addTo(self._map.map);
} else {
self._map.map.removeLayer(self._geolayer);
}
}
})
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}
/**
* The main function to load data into this layer.
* The data that is NOT used by this layer, is returned as a geojson object; the other data is rendered
*/
public SetApplicableData(geojson: any): any {
const leftoverFeatures = [];
const selfFeatures = [];
for (const feature of geojson.features) {
// feature.properties contains all the properties
var tags = TagUtils.proprtiesToKV(feature.properties);
if (this.filters.matches(tags)) {
selfFeatures.push(feature);
} else {
leftoverFeatures.push(feature);
}
}
this.RenderLayer({
type: "FeatureCollection",
features: selfFeatures
})
const notShadowed = [];
for (const feature of leftoverFeatures) {
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if (this._maxAllowedOverlap !== undefined && this._maxAllowedOverlap >= 0) {
if (GeoOperations.featureIsContainedInAny(feature, selfFeatures, this._maxAllowedOverlap)) {
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// This feature is filtered away
continue;
}
}
notShadowed.push(feature);
}
return {
type: "FeatureCollection",
features: notShadowed
};
}
public AddNewElement(element) {
this._newElements.push(element);
console.log("Element added");
this.RenderLayer(this._dataFromOverpass); // Update the layer
}
private RenderLayer(data) {
let self = this;
if (this._geolayer !== undefined && this._geolayer !== null) {
this._map.map.removeLayer(this._geolayer);
}
this._dataFromOverpass = data;
const fusedFeatures = [];
const idsFromOverpass = [];
for (const feature of data.features) {
idsFromOverpass.push(feature.properties.id);
fusedFeatures.push(feature);
}
for (const feature of this._newElements) {
if (idsFromOverpass.indexOf(feature.properties.id) < 0) {
// This element is not yet uploaded or not yet visible in overpass
// We include it in the layer
fusedFeatures.push(feature);
}
}
// We use a new, fused dataset
data = {
type: "FeatureCollection",
features: fusedFeatures
}
// The data is split in two parts: the poinst and the rest
// The points get a special treatment in order to render them properly
// Note that some features might get a point representation as well
this._geolayer = L.geoJSON(data, {
style: function (feature) {
return self._style(feature.properties);
},
pointToLayer: function (feature, latLng) {
const style = self._style(feature.properties);
let marker;
if (style.icon === undefined) {
marker = L.circle(latLng, {
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radius: 25,
color: style.color
});
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} else {
marker = L.marker(latLng, {
icon: style.icon
});
}
return marker;
},
onEachFeature: function (feature, layer) {
let eventSource = self._storage.addOrGetElement(feature);
eventSource.addCallback(function () {
if (layer.setIcon) {
layer.setIcon(self._style(feature.properties).icon)
} else {
console.log("UPdating", layer);
self._geolayer.setStyle(function (feature) {
return self._style(feature.properties);
});
}
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});
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layer.on("click", function (e) {
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console.log("Selected ", feature)
self._selectedElement.setData(feature.properties);
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const uiElement = self._showOnPopup(eventSource);
const popup = L.popup()
.setContent(uiElement.Render())
.setLatLng(e.latlng)
.openOn(self._map.map);
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uiElement.Update();
uiElement.Activate();
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L.DomEvent.stop(e); // Marks the event as consumed
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});
}
});
if (this.isDisplayed.data) {
this._geolayer.addTo(this._map.map);
}
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}
}