116 lines
2.1 KiB
JavaScript
116 lines
2.1 KiB
JavaScript
/*
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* L.LayerGroup is a class to combine several layers into one so that
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* 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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var i, len;
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if (layers) {
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for (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 = this.getLayerId(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 = layer in this._layers ? layer : this.getLayerId(layer);
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if (this._map && this._layers[id]) {
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this._map.removeLayer(this._layers[id]);
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}
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delete this._layers[id];
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return this;
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},
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hasLayer: function (layer) {
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if (!layer) { return false; }
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return (layer in this._layers || this.getLayerId(layer) in this._layers);
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},
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clearLayers: function () {
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this.eachLayer(this.removeLayer, this);
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return this;
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},
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invoke: function (methodName) {
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var args = Array.prototype.slice.call(arguments, 1),
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i, layer;
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for (i in this._layers) {
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layer = this._layers[i];
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if (layer[methodName]) {
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layer[methodName].apply(layer, args);
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}
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}
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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.eachLayer(map.addLayer, map);
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},
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onRemove: function (map) {
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this.eachLayer(map.removeLayer, map);
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this._map = null;
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},
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addTo: function (map) {
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map.addLayer(this);
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return this;
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},
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eachLayer: function (method, context) {
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for (var i in this._layers) {
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method.call(context, this._layers[i]);
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}
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return this;
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},
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getLayer: function (id) {
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return this._layers[id];
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},
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getLayers: function () {
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var layers = [];
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for (var i in this._layers) {
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layers.push(this._layers[i]);
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}
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return layers;
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},
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setZIndex: function (zIndex) {
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return this.invoke('setZIndex', zIndex);
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},
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getLayerId: function (layer) {
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return L.stamp(layer);
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}
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});
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L.layerGroup = function (layers) {
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return new L.LayerGroup(layers);
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};
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