extlib/leaflet/src/core/Events.js

   1 /*
   2  * L.Mixin.Events adds custom events functionality to Leaflet classes
   3  */
   4
   5 L.Mixin = {};
   6
   7 L.Mixin.Events = {
   8         addEventListener: function(/*String*/ type, /*Function*/ fn, /*(optional) Object*/ context) {
   9                 var events = this._leaflet_events = this._leaflet_events || {};
  10                 events[type] = events[type] || [];
  11                 events[type].push({
  12                         action: fn,
  13                         context: context
  14                 });
  15                 return this;
  16         },
  17
  18         hasEventListeners: function(/*String*/ type) /*-> Boolean*/ {
  19                 var k = '_leaflet_events';
  20                 return (k in this) && (type in this[k]) && (this[k][type].length > 0);
  21         },
  22
  23         removeEventListener: function(/*String*/ type, /*Function*/ fn, /*(optional) Object*/ context) {
  24                 if (!this.hasEventListeners(type)) { return this; }
  25
  26                 for (var i = 0, events = this._leaflet_events, len = events[type].length; i < len; i++) {
  27                         if (
  28                                 (events[type][i].action === fn) &&
  29                                 (!context || (events[type][i].context === context))
  30                         ) {
  31                                 events[type].splice(i, 1);
  32                                 return this;
  33                         }
  34                 }
  35                 return this;
  36         },
  37
  38         fireEvent: function(/*String*/ type, /*(optional) Object*/ data) {
  39                 if (!this.hasEventListeners(type)) { return; }
  40
  41                 var event = L.Util.extend({
  42                         type: type,
  43                         target: this
  44                 }, data);
  45
  46                 var listeners = this._leaflet_events[type].slice();
  47
  48                 for (var i = 0, len = listeners.length; i < len; i++) {
  49                         listeners[i].action.call(listeners[i].context || this, event);
  50                 }
  51
  52                 return this;
  53         }
  54 };
  55
  56 L.Mixin.Events.on = L.Mixin.Events.addEventListener;
  57 L.Mixin.Events.off = L.Mixin.Events.removeEventListener;
  58 L.Mixin.Events.fire = L.Mixin.Events.fireEvent;