1 files changed, 58 insertions, 0 deletions
diff --git a/extlib/leaflet/src/layer/LayerGroup.js b/extlib/leaflet/src/layer/LayerGroup.js
new file mode 100644
index 00000000..58940d40
--- /dev/null
+++ b/extlib/leaflet/src/layer/LayerGroup.js
@@ -0,0 +1,58 @@
+/*
+ * L.LayerGroup is a class to combine several layers so you can manipulate the group (e.g. add/remove it) as one layer.
+ */
+
+L.LayerGroup = L.Class.extend({
+	initialize: function(layers) {
+		this._layers = {};
+		
+		if (layers) {
+			for (var i = 0, len = layers.length; i < len; i++) {
+				this.addLayer(layers[i]);
+			}
+		}
+	},
+	
+	addLayer: function(layer) {
+		var id = L.Util.stamp(layer);
+		this._layers[id] = layer;
+		
+		if (this._map) {
+			this._map.addLayer(layer);
+		}
+		return this;
+	},
+	
+	removeLayer: function(layer) {
+		var id = L.Util.stamp(layer);
+		delete this._layers[id];
+		
+		if (this._map) {
+			this._map.removeLayer(layer);
+		}
+		return this;
+	},
+	
+	clearLayers: function() {
+		this._iterateLayers(this.removeLayer, this);
+		return this;
+	},
+
+	onAdd: function(map) {
+		this._map = map;
+		this._iterateLayers(map.addLayer, map);
+	},
+	
+	onRemove: function(map) {
+		this._iterateLayers(map.removeLayer, map);
+		delete this._map;
+	},
+	
+	_iterateLayers: function(method, context) {
+		for (var i in this._layers) {
+			if (this._layers.hasOwnProperty(i)) {
+				method.call(context, this._layers[i]);
+			}
+		}
+	}
+});
+\ No newline at end of file