forked from MapComplete/MapComplete
328 lines
11 KiB
TypeScript
328 lines
11 KiB
TypeScript
import * as L from "leaflet";
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import {UIEventSource} from "../UIEventSource";
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import Svg from "../../Svg";
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import Img from "../../UI/Base/Img";
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import {LocalStorageSource} from "../Web/LocalStorageSource";
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import {VariableUiElement} from "../../UI/Base/VariableUIElement";
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import LayoutConfig from "../../Models/ThemeConfig/LayoutConfig";
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import {QueryParameters} from "../Web/QueryParameters";
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export default class GeoLocationHandler extends VariableUiElement {
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/**
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* Wether or not the geolocation is active, aka the user requested the current location
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* @private
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*/
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private readonly _isActive: UIEventSource<boolean>;
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/**
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* Wether or not the geolocation is locked, aka the user requested the current location and wants the crosshair to follow the user
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* @private
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*/
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private readonly _isLocked: UIEventSource<boolean>;
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/**
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* The callback over the permission API
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* @private
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*/
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private readonly _permission: UIEventSource<string>;
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/***
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* The marker on the map, in order to update it
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* @private
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*/
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private _marker: L.Marker;
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/**
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* Literally: _currentGPSLocation.data != undefined
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* @private
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*/
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private readonly _hasLocation: UIEventSource<boolean>;
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private readonly _currentGPSLocation: UIEventSource<{
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latlng: any;
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accuracy: number;
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}>;
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/**
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* Kept in order to update the marker
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* @private
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*/
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private readonly _leafletMap: UIEventSource<L.Map>;
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/**
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* The date when the user requested the geolocation. If we have a location, it'll autozoom to it the first 30 secs
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* @private
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*/
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private _lastUserRequest: Date;
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/**
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* A small flag on localstorage. If the user previously granted the geolocation, it will be set.
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* On firefox, the permissions api is broken (probably fingerprint resistiance) and "granted + don't ask again" doesn't stick between sessions.
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*
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* Instead, we set this flag. If this flag is set upon loading the page, we start geolocating immediately.
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* If the user denies the geolocation this time, we unset this flag
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* @private
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*/
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private readonly _previousLocationGrant: UIEventSource<string>;
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private readonly _layoutToUse: LayoutConfig;
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constructor(
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currentGPSLocation: UIEventSource<{ latlng: any; accuracy: number }>,
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leafletMap: UIEventSource<L.Map>,
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layoutToUse: LayoutConfig
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) {
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const hasLocation = currentGPSLocation.map(
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(location) => location !== undefined
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);
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const previousLocationGrant = LocalStorageSource.Get(
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"geolocation-permissions"
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);
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const isActive = new UIEventSource<boolean>(false);
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const isLocked = new UIEventSource<boolean>(false);
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const permission = new UIEventSource<string>("");
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const lastClick = new UIEventSource<Date>(undefined);
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const lastClickWithinThreeSecs = lastClick.map(lastClick => {
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if (lastClick === undefined) {
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return false;
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}
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const timeDiff = (new Date().getTime() - lastClick.getTime()) / 1000
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return timeDiff <= 3
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})
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lastClick.addCallbackAndRunD(_ => {
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window.setTimeout(() => {
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if (lastClickWithinThreeSecs.data) {
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lastClick.ping()
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}
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}, 500)
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})
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super(
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hasLocation.map(
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(hasLocationData) => {
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if (permission.data === "denied") {
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return Svg.location_refused_svg();
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}
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if (!isActive.data) {
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return Svg.location_empty_svg()
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}
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if (!hasLocationData) {
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// Position not yet found but we are active: we spin to indicate activity
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const icon = Svg.location_empty_svg()
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icon.SetStyle("animation: spin 4s linear infinite;")
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return icon;
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}
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if (isLocked.data) {
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return Svg.location_locked_svg()
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}
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if (lastClickWithinThreeSecs.data) {
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return Svg.location_unlocked_svg()
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}
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// We have a location, so we show a dot in the center
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return Svg.location_svg();
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},
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[isActive, isLocked, permission, lastClickWithinThreeSecs]
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)
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);
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this.SetClass("mapcontrol")
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this._isActive = isActive;
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this._isLocked = isLocked;
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this._permission = permission
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this._previousLocationGrant = previousLocationGrant;
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this._currentGPSLocation = currentGPSLocation;
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this._leafletMap = leafletMap;
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this._layoutToUse = layoutToUse;
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this._hasLocation = hasLocation;
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const self = this;
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const currentPointer = this._isActive.map(
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(isActive) => {
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if (isActive && !self._hasLocation.data) {
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return "cursor-wait";
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}
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return "cursor-pointer";
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},
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[this._hasLocation]
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);
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currentPointer.addCallbackAndRun((pointerClass) => {
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self.RemoveClass("cursor-wait")
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self.RemoveClass("cursor-pointer")
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self.SetClass(pointerClass);
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});
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this.onClick(() => {
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/*
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* If the previous click was within 3 seconds (and we have an active location), then we lock to the location
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*/
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if (self._hasLocation.data) {
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if (isLocked.data) {
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isLocked.setData(false)
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} else if (lastClick.data !== undefined) {
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const timeDiff = (new Date().getTime() - lastClick.data.getTime()) / 1000
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if (timeDiff <= 3) {
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isLocked.setData(true)
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lastClick.setData(undefined)
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} else {
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lastClick.setData(new Date())
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}
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} else {
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lastClick.setData(new Date())
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}
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}
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self.init(true, true);
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});
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const latLonGiven = QueryParameters.wasInitialized("lat") && QueryParameters.wasInitialized("lon")
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this.init(false, !latLonGiven);
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isLocked.addCallbackAndRunD(isLocked => {
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if (isLocked) {
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leafletMap.data?.dragging?.disable()
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} else {
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leafletMap.data?.dragging?.enable()
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}
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})
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this._currentGPSLocation.addCallback((location) => {
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self._previousLocationGrant.setData("granted");
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const timeSinceRequest =
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(new Date().getTime() - (self._lastUserRequest?.getTime() ?? 0)) / 1000;
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if (timeSinceRequest < 30) {
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self.MoveToCurrentLoction(16);
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} else if (self._isLocked.data) {
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self.MoveToCurrentLoction();
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}
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let color = "#1111cc";
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try {
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color = getComputedStyle(document.body).getPropertyValue(
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"--catch-detail-color"
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);
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} catch (e) {
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console.error(e);
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}
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const icon = L.icon({
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iconUrl: Img.AsData(Svg.location.replace(/#000000/g, color).replace(/#000/g, color)),
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iconSize: [40, 40], // size of the icon
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iconAnchor: [20, 20], // point of the icon which will correspond to marker's location
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});
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const map = self._leafletMap.data;
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if(map === undefined){
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return;
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}
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const newMarker = L.marker(location.latlng, {icon: icon});
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newMarker.addTo(map);
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if (self._marker !== undefined) {
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map.removeLayer(self._marker);
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}
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self._marker = newMarker;
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});
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}
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private init(askPermission: boolean, forceZoom: boolean) {
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const self = this;
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if (self._isActive.data) {
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self.MoveToCurrentLoction(16);
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return;
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}
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try {
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navigator?.permissions
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?.query({name: "geolocation"})
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?.then(function (status) {
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console.log("Geolocation permission is ", status.state);
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if (status.state === "granted") {
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self.StartGeolocating(forceZoom);
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}
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self._permission.setData(status.state);
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status.onchange = function () {
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self._permission.setData(status.state);
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};
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});
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} catch (e) {
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console.error(e);
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}
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if (askPermission) {
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self.StartGeolocating(forceZoom);
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} else if (this._previousLocationGrant.data === "granted") {
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this._previousLocationGrant.setData("");
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self.StartGeolocating(forceZoom);
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}
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}
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private MoveToCurrentLoction(targetZoom?: number) {
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const location = this._currentGPSLocation.data;
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this._lastUserRequest = undefined;
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if (
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this._currentGPSLocation.data.latlng[0] === 0 &&
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this._currentGPSLocation.data.latlng[1] === 0
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) {
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console.debug("Not moving to GPS-location: it is null island");
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return;
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}
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// We check that the GPS location is not out of bounds
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const b = this._layoutToUse.lockLocation;
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let inRange = true;
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if (b) {
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if (b !== true) {
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// B is an array with our locklocation
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inRange =
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b[0][0] <= location.latlng[0] &&
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location.latlng[0] <= b[1][0] &&
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b[0][1] <= location.latlng[1] &&
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location.latlng[1] <= b[1][1];
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}
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}
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if (!inRange) {
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console.log(
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"Not zooming to GPS location: out of bounds",
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b,
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location.latlng
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);
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} else {
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this._leafletMap.data.setView(location.latlng, targetZoom);
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}
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}
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private StartGeolocating(zoomToGPS = true) {
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const self = this;
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this._lastUserRequest = zoomToGPS ? new Date() : new Date(0);
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if (self._permission.data === "denied") {
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self._previousLocationGrant.setData("");
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self._isActive.setData(false)
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return "";
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}
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if (this._currentGPSLocation.data !== undefined) {
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this.MoveToCurrentLoction(16);
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}
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if (self._isActive.data) {
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return;
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}
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self._isActive.setData(true);
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navigator.geolocation.watchPosition(
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function (position) {
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self._currentGPSLocation.setData({
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latlng: [position.coords.latitude, position.coords.longitude],
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accuracy: position.coords.accuracy,
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});
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},
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function () {
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console.warn("Could not get location with navigator.geolocation");
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},
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{
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enableHighAccuracy: true
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}
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);
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}
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}
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