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/*
* 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]);
}
}
}
});
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