58 lines
1.2 KiB
JavaScript
58 lines
1.2 KiB
JavaScript
/*
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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.
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*/
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L.LayerGroup = L.Class.extend({
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initialize: function(layers) {
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this._layers = {};
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if (layers) {
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for (var i = 0, len = layers.length; i < len; i++) {
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this.addLayer(layers[i]);
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}
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}
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},
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addLayer: function(layer) {
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var id = L.Util.stamp(layer);
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this._layers[id] = layer;
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if (this._map) {
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this._map.addLayer(layer);
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}
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return this;
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},
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removeLayer: function(layer) {
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var id = L.Util.stamp(layer);
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delete this._layers[id];
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if (this._map) {
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this._map.removeLayer(layer);
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}
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return this;
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},
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clearLayers: function() {
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this._iterateLayers(this.removeLayer, this);
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return this;
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},
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onAdd: function(map) {
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this._map = map;
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this._iterateLayers(map.addLayer, map);
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},
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onRemove: function(map) {
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this._iterateLayers(map.removeLayer, map);
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delete this._map;
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},
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_iterateLayers: function(method, context) {
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for (var i in this._layers) {
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if (this._layers.hasOwnProperty(i)) {
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method.call(context, this._layers[i]);
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}
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}
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}
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}); |