@agm/core
Version:
Angular components for Google Maps
98 lines • 11.6 kB
JavaScript
import { Injectable, NgZone } from '@angular/core';
import { Observable } from 'rxjs';
import { GoogleMapsAPIWrapper } from './../google-maps-api-wrapper';
/**
* Manages all Data Layers for a Google Map instance.
*/
export class DataLayerManager {
constructor(_wrapper, _zone) {
this._wrapper = _wrapper;
this._zone = _zone;
this._layers = new Map();
}
/**
* Adds a new Data Layer to the map.
*/
addDataLayer(layer) {
const newLayer = this._wrapper.createDataLayer({
style: layer.style,
})
.then(d => {
if (layer.geoJson) {
// NOTE: accessing "features" on google.maps.Data is undocumented
this.getDataFeatures(d, layer.geoJson).then(features => d.features = features);
}
return d;
});
this._layers.set(layer, newLayer);
}
deleteDataLayer(layer) {
this._layers.get(layer).then(l => {
l.setMap(null);
this._layers.delete(layer);
});
}
updateGeoJson(layer, geoJson) {
this._layers.get(layer).then(l => {
l.forEach(feature => {
l.remove(feature);
// NOTE: accessing "features" on google.maps.Data is undocumented
const index = l.features.indexOf(feature, 0);
if (index > -1) {
l.features.splice(index, 1);
}
});
this.getDataFeatures(l, geoJson).then(features => l.features = features);
});
}
setDataOptions(layer, options) {
this._layers.get(layer).then(l => {
l.setControlPosition(options.controlPosition);
l.setControls(options.controls);
l.setDrawingMode(options.drawingMode);
l.setStyle(options.style);
});
}
/**
* Creates a Google Maps event listener for the given DataLayer as an Observable
*/
createEventObservable(eventName, layer) {
return new Observable((observer) => {
this._layers.get(layer).then((d) => {
d.addListener(eventName, (e) => this._zone.run(() => observer.next(e)));
});
});
}
/**
* Extract features from a geoJson using google.maps Data Class
* @param d : google.maps.Data class instance
* @param geoJson : url or geojson object
*/
getDataFeatures(d, geoJson) {
return new Promise((resolve, reject) => {
if (typeof geoJson === 'object') {
try {
const features = d.addGeoJson(geoJson);
resolve(features);
}
catch (e) {
reject(e);
}
}
else if (typeof geoJson === 'string') {
d.loadGeoJson(geoJson, null, resolve);
}
else {
reject(`Impossible to extract features from geoJson: wrong argument type`);
}
});
}
}
DataLayerManager.decorators = [
{ type: Injectable }
];
DataLayerManager.ctorParameters = () => [
{ type: GoogleMapsAPIWrapper },
{ type: NgZone }
];
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{ Injectable, NgZone } from '@angular/core';\nimport { Observable, Observer } from 'rxjs';\n\nimport { AgmDataLayer } from './../../directives/data-layer';\nimport { GoogleMapsAPIWrapper } from './../google-maps-api-wrapper';\n\n/**\n * Manages all Data Layers for a Google Map instance.\n */\n@Injectable()\nexport class DataLayerManager {\n  private _layers: Map<AgmDataLayer, Promise<google.maps.Data>> =\n  new Map<AgmDataLayer, Promise<google.maps.Data>>();\n\n  constructor(private _wrapper: GoogleMapsAPIWrapper, private _zone: NgZone) { }\n\n  /**\n   * Adds a new Data Layer to the map.\n   */\n  addDataLayer(layer: AgmDataLayer) {\n    const newLayer = this._wrapper.createDataLayer({\n      style: layer.style,\n    } as google.maps.Data.DataOptions)\n    .then(d => {\n      if (layer.geoJson) {\n        // NOTE: accessing \"features\" on google.maps.Data is undocumented\n        this.getDataFeatures(d, layer.geoJson).then(features => (d as any).features = features);\n      }\n      return d;\n    });\n    this._layers.set(layer, newLayer);\n  }\n\n  deleteDataLayer(layer: AgmDataLayer) {\n    this._layers.get(layer).then(l => {\n      l.setMap(null);\n      this._layers.delete(layer);\n    });\n  }\n\n  updateGeoJson(layer: AgmDataLayer, geoJson: object | string) {\n    this._layers.get(layer).then(l => {\n      l.forEach(feature => {\n        l.remove(feature);\n\n        // NOTE: accessing \"features\" on google.maps.Data is undocumented\n        const index = (l as any).features.indexOf(feature, 0);\n        if (index > -1) {\n          (l as any).features.splice(index, 1);\n        }\n      });\n      this.getDataFeatures(l, geoJson).then(features => (l as any).features = features);\n    });\n  }\n\n  setDataOptions(layer: AgmDataLayer, options: google.maps.Data.DataOptions)\n  {\n    this._layers.get(layer).then(l => {\n      l.setControlPosition(options.controlPosition);\n      l.setControls(options.controls);\n      l.setDrawingMode(options.drawingMode);\n      l.setStyle(options.style);\n    });\n  }\n\n  /**\n   * Creates a Google Maps event listener for the given DataLayer as an Observable\n   */\n  createEventObservable<T>(eventName: string, layer: AgmDataLayer): Observable<T> {\n    return new Observable((observer: Observer<T>) => {\n      this._layers.get(layer).then((d: google.maps.Data) => {\n        d.addListener(eventName, (e: T) => this._zone.run(() => observer.next(e)));\n      });\n    });\n  }\n\n  /**\n   * Extract features from a geoJson using google.maps Data Class\n   * @param d : google.maps.Data class instance\n   * @param geoJson : url or geojson object\n   */\n  getDataFeatures(d: google.maps.Data, geoJson: object | string): Promise<google.maps.Data.Feature[]> {\n    return new Promise<google.maps.Data.Feature[]>((resolve, reject) => {\n        if (typeof geoJson === 'object') {\n          try {\n            const features = d.addGeoJson(geoJson);\n            resolve(features);\n          } catch (e) {\n            reject(e);\n          }\n        } else if (typeof geoJson === 'string') {\n          d.loadGeoJson(geoJson, null, resolve);\n        } else {\n          reject(`Impossible to extract features from geoJson: wrong argument type`);\n        }\n      });\n  }\n}\n"]}