Leaflet/src/layer/FeatureGroup.js

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/*
* L.FeatureGroup extends L.LayerGroup by introducing mouse events and bindPopup method shared between a group of layers.
*/
L.FeatureGroup = L.LayerGroup.extend({
includes: L.Mixin.Events,
addLayer: function(layer) {
this._initEvents(layer);
L.LayerGroup.prototype.addLayer.call(this, layer);
},
bindPopup: function(content) {
for (var i in this._layers) {
if (this._layers.hasOwnProperty(i) && this._layers[i].bindPopup) {
this._layers[i].bindPopup(content);
}
}
},
_events: ['click', 'dblclick', 'mouseover', 'mouseout'],
_initEvents: function(layer) {
for (var i = 0, len = this._events.length; i < len; i++) {
layer.on(this._events[i], this._propagateEvent, this);
}
},
_propagateEvent: function(e) {
e.layer = e.target;
e.target = this;
this.fire(e.type, e);
}
});