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Lts/Tools/ArAssetsV2/node_modules/leaflet/src/layer/LayerGroup.js

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+
+import {Layer} from './Layer';
+import * as Util from '../core/Util';
+
+/*
+ * @class LayerGroup
+ * @aka L.LayerGroup
+ * @inherits Layer
+ *
+ * Used to group several layers and handle them as one. If you add it to the map,
+ * any layers added or removed from the group will be added/removed on the map as
+ * well. Extends `Layer`.
+ *
+ * @example
+ *
+ * ```js
+ * L.layerGroup([marker1, marker2])
+ * 	.addLayer(polyline)
+ * 	.addTo(map);
+ * ```
+ */
+
+export var LayerGroup = Layer.extend({
+
+	initialize: function (layers, options) {
+		Util.setOptions(this, options);
+
+		this._layers = {};
+
+		var i, len;
+
+		if (layers) {
+			for (i = 0, len = layers.length; i < len; i++) {
+				this.addLayer(layers[i]);
+			}
+		}
+	},
+
+	// @method addLayer(layer: Layer): this
+	// Adds the given layer to the group.
+	addLayer: function (layer) {
+		var id = this.getLayerId(layer);
+
+		this._layers[id] = layer;
+
+		if (this._map) {
+			this._map.addLayer(layer);
+		}
+
+		return this;
+	},
+
+	// @method removeLayer(layer: Layer): this
+	// Removes the given layer from the group.
+	// @alternative
+	// @method removeLayer(id: Number): this
+	// Removes the layer with the given internal ID from the group.
+	removeLayer: function (layer) {
+		var id = layer in this._layers ? layer : this.getLayerId(layer);
+
+		if (this._map && this._layers[id]) {
+			this._map.removeLayer(this._layers[id]);
+		}
+
+		delete this._layers[id];
+
+		return this;
+	},
+
+	// @method hasLayer(layer: Layer): Boolean
+	// Returns `true` if the given layer is currently added to the group.
+	// @alternative
+	// @method hasLayer(id: Number): Boolean
+	// Returns `true` if the given internal ID is currently added to the group.
+	hasLayer: function (layer) {
+		return !!layer && (layer in this._layers || this.getLayerId(layer) in this._layers);
+	},
+
+	// @method clearLayers(): this
+	// Removes all the layers from the group.
+	clearLayers: function () {
+		return this.eachLayer(this.removeLayer, this);
+	},
+
+	// @method invoke(methodName: String, …): this
+	// Calls `methodName` on every layer contained in this group, passing any
+	// additional parameters. Has no effect if the layers contained do not
+	// implement `methodName`.
+	invoke: function (methodName) {
+		var args = Array.prototype.slice.call(arguments, 1),
+		    i, layer;
+
+		for (i in this._layers) {
+			layer = this._layers[i];
+
+			if (layer[methodName]) {
+				layer[methodName].apply(layer, args);
+			}
+		}
+
+		return this;
+	},
+
+	onAdd: function (map) {
+		this.eachLayer(map.addLayer, map);
+	},
+
+	onRemove: function (map) {
+		this.eachLayer(map.removeLayer, map);
+	},
+
+	// @method eachLayer(fn: Function, context?: Object): this
+	// Iterates over the layers of the group, optionally specifying context of the iterator function.
+	// ```js
+	// group.eachLayer(function (layer) {
+	// 	layer.bindPopup('Hello');
+	// });
+	// ```
+	eachLayer: function (method, context) {
+		for (var i in this._layers) {
+			method.call(context, this._layers[i]);
+		}
+		return this;
+	},
+
+	// @method getLayer(id: Number): Layer
+	// Returns the layer with the given internal ID.
+	getLayer: function (id) {
+		return this._layers[id];
+	},
+
+	// @method getLayers(): Layer[]
+	// Returns an array of all the layers added to the group.
+	getLayers: function () {
+		var layers = [];
+		this.eachLayer(layers.push, layers);
+		return layers;
+	},
+
+	// @method setZIndex(zIndex: Number): this
+	// Calls `setZIndex` on every layer contained in this group, passing the z-index.
+	setZIndex: function (zIndex) {
+		return this.invoke('setZIndex', zIndex);
+	},
+
+	// @method getLayerId(layer: Layer): Number
+	// Returns the internal ID for a layer
+	getLayerId: function (layer) {
+		return Util.stamp(layer);
+	}
+});
+
+
+// @factory L.layerGroup(layers?: Layer[], options?: Object)
+// Create a layer group, optionally given an initial set of layers and an `options` object.
+export var layerGroup = function (layers, options) {
+	return new LayerGroup(layers, options);
+};