# Code coverage report for src/core/Events.js

## Statements: 100% (63 / 63) Branches: 88.24% (60 / 68) Functions: 100% (4 / 4) Lines: 100% (63 / 63)

All files » src/core/ » Events.js

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     /*
     * L.Mixin.Events is used to add custom events functionality to Leaflet classes.
     */

    var key = '_leaflet_events';

    L.Mixin = {};

    L.Mixin.Events = {

    	addEventListener: function (types, fn, context) { // (String, Function[, Object]) or (Object[, Object])

    		var events = this[key] = this[key] || {},
    		    contextId = context && L.stamp(context),
    		    type, i, len, evt,
    		    objKey, objLenKey, eventsObj;

    		// types can be a map of types/handlers
    		if (typeof types === 'object') {
    			for (type in types) {
    				Eif (types.hasOwnProperty(type)) {
    					this.addEventListener(type, types[type], fn);
    				}
    			}

    			return this;
    		}

    		// types can be a string of space-separated words
    		types = L.Util.splitWords(types);

    		for (i = 0, len = types.length; i < len; i++) {
    			evt = {
    				action: fn,
    				context: context || this
    			};

    			if (contextId) {
    				// store listeners of a particular context in a separate hash (if it has an id)
    				// gives a major performance boost when removing thousands of map layers

    				objKey = types[i] + '_idx',
    				objLenKey = objKey + '_len',
    				eventsObj = events[objKey] = events[objKey] || {};

    				if (eventsObj[contextId]) {
    					eventsObj[contextId].push(evt);
    				} else {
    					eventsObj[contextId] = [evt];
    					events[objLenKey] = (events[objLenKey] || 0) + 1;
    				}

    			} else {
    				events[types[i]] = events[types[i]] || [];
    				events[types[i]].push(evt);
    			}
    		}

    		return this;
    	},

    	hasEventListeners: function (type) { // (String) -> Boolean
    		return (key in this) &&
    		       (((type in this[key]) && this[key][type].length > 0) ||
    		        (this[key][type + '_idx_len'] > 0));
    	},

    	removeEventListener: function (types, fn, context) { // (String[, Function, Object]) or (Object[, Object])
    		var events = this[key],
    		    contextId = context && L.stamp(context),
    		    type, i, len, listeners, j,
    		    objKey, objLenKey;

    		if (typeof types === 'object') {
    			for (type in types) {
    				Eif (types.hasOwnProperty(type)) {
    					this.removeEventListener(type, types[type], fn);
    				}
    			}
    			return this;
    		}

    		types = L.Util.splitWords(types);

    		for (i = 0, len = types.length; i < len; i++) {
    			if (this.hasEventListeners(types[i])) {

    				objKey = types[i] + '_idx';

    				if (contextId && events[objKey]) {
    					listeners =  events[objKey][contextId] || [];
    				} else {
    					listeners = events[types[i]] || [];
    				}

    				for (j = listeners.length - 1; j >= 0; j--) {
    					if ((!fn || listeners[j].action === fn) && (!context || (listeners[j].context === context))) {
    						listeners.splice(j, 1);
    					}
    				}

    				if (contextId && listeners.length === 0 && events[objKey] && events[objKey][contextId]) {
    					objLenKey = objKey + '_len';
    					delete events[objKey][contextId];
    					events[objLenKey] = (events[objLenKey] || 1) - 1;
    				}
    			}
    		}

    		return this;
    	},

    	fireEvent: function (type, data) { // (String[, Object])
    		if (!this.hasEventListeners(type)) {
    			return this;
    		}

    		var event = L.Util.extend({}, data, {
    			type: type,
    			target: this
    		});

    		var listeners, i, len, eventsObj, contextId;

    		if (this[key][type]) {
    			listeners = this[key][type].slice();

    			for (i = 0, len = listeners.length; i < len; i++) {
    				listeners[i].action.call(listeners[i].context || this, event);
    			}
    		}

    		// fire event for the context-indexed listeners as well

    		eventsObj = this[key][type + '_idx'];

    		if (eventsObj) {
    			for (contextId in eventsObj) {
    				Eif (eventsObj.hasOwnProperty(contextId)) {
    					listeners = eventsObj[contextId];
    					Eif (listeners) {
    						for (i = 0, len = listeners.length; i < len; i++) {
    							listeners[i].action.call(listeners[i].context || this, event);
    						}
    					}
    				}
    			}
    		}

    		return this;
    	}
    };

    L.Mixin.Events.on = L.Mixin.Events.addEventListener;
    L.Mixin.Events.off = L.Mixin.Events.removeEventListener;
    L.Mixin.Events.fire = L.Mixin.Events.fireEvent;