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src_pixi_utils_EventTarget.js.html
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<h1 class="file-heading">File: src/pixi/utils/EventTarget.js</h1>
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<pre class="code prettyprint linenums">
/**
* @author Mat Groves http://matgroves.com/ @Doormat23
* @author Chad Engler https://github.com/englercj @Rolnaaba
*/
/**
* Originally based on https://github.com/mrdoob/eventtarget.js/ from mr Doob.
* Currently takes inspiration from the nodejs EventEmitter, EventEmitter3, and smokesignals
*/
/**
* Mixins event emitter functionality to a class
*
* @class EventTarget
* @example
* function MyEmitter() {}
*
* PIXI.EventTarget.mixin(MyEmitter.prototype);
*
* var em = new MyEmitter();
* em.emit('eventName', 'some data', 'some more data', {}, null, ...);
*/
PIXI.EventTarget = {
/**
* Backward compat from when this used to be a function
*/
call: function callCompat(obj) {
if(obj) {
obj = obj.prototype || obj;
PIXI.EventTarget.mixin(obj);
}
},
/**
* Mixes in the properties of the EventTarget prototype onto another object
*
* @method mixin
* @param object {Object} The obj to mix into
*/
mixin: function mixin(obj) {
/**
* Return a list of assigned event listeners.
*
* @method listeners
* @param eventName {String} The events that should be listed.
* @returns {Array} An array of listener functions
*/
obj.listeners = function listeners(eventName) {
this._listeners = this._listeners || {};
return this._listeners[eventName] ? this._listeners[eventName].slice() : [];
};
/**
* Emit an event to all registered event listeners.
*
* @method emit
* @alias dispatchEvent
* @param eventName {String} The name of the event.
* @returns {Boolean} Indication if we've emitted an event.
*/
obj.emit = obj.dispatchEvent = function emit(eventName, data) {
this._listeners = this._listeners || {};
//backwards compat with old method ".emit({ type: 'something' })"
if(typeof eventName === 'object') {
data = eventName;
eventName = eventName.type;
}
//ensure we are using a real pixi event
if(!data || data.__isEventObject !== true) {
data = new PIXI.Event(this, eventName, data);
}
//iterate the listeners
if(this._listeners && this._listeners[eventName]) {
var listeners = this._listeners[eventName].slice(0),
length = listeners.length,
fn = listeners[0],
i;
for(i = 0; i < length; fn = listeners[++i]) {
//call the event listener
fn.call(this, data);
//if "stopImmediatePropagation" is called, stop calling sibling events
if(data.stoppedImmediate) {
return this;
}
}
//if "stopPropagation" is called then don't bubble the event
if(data.stopped) {
return this;
}
}
//bubble this event up the scene graph
if(this.parent && this.parent.emit) {
this.parent.emit.call(this.parent, eventName, data);
}
return this;
};
/**
* Register a new EventListener for the given event.
*
* @method on
* @alias addEventListener
* @param eventName {String} Name of the event.
* @param callback {Functon} fn Callback function.
*/
obj.on = obj.addEventListener = function on(eventName, fn) {
this._listeners = this._listeners || {};
(this._listeners[eventName] = this._listeners[eventName] || [])
.push(fn);
return this;
};
/**
* Add an EventListener that's only called once.
*
* @method once
* @param eventName {String} Name of the event.
* @param callback {Function} Callback function.
*/
obj.once = function once(eventName, fn) {
this._listeners = this._listeners || {};
var self = this;
function onceHandlerWrapper() {
fn.apply(self.off(eventName, onceHandlerWrapper), arguments);
}
onceHandlerWrapper._originalHandler = fn;
return this.on(eventName, onceHandlerWrapper);
};
/**
* Remove event listeners.
*
* @method off
* @alias removeEventListener
* @param eventName {String} The event we want to remove.
* @param callback {Function} The listener that we need to find.
*/
obj.off = obj.removeEventListener = function off(eventName, fn) {
this._listeners = this._listeners || {};
if(!this._listeners[eventName])
return this;
var list = this._listeners[eventName],
i = fn ? list.length : 0;
while(i-- > 0) {
if(list[i] === fn || list[i]._originalHandler === fn) {
list.splice(i, 1);
}
}
if(list.length === 0) {
delete this._listeners[eventName];
}
return this;
};
/**
* Remove all listeners or only the listeners for the specified event.
*
* @method removeAllListeners
* @param eventName {String} The event you want to remove all listeners for.
*/
obj.removeAllListeners = function removeAllListeners(eventName) {
this._listeners = this._listeners || {};
if(!this._listeners[eventName])
return this;
delete this._listeners[eventName];
return this;
};
}
};
/**
* Creates an homogenous object for tracking events so users can know what to expect.
*
* @class Event
* @extends Object
* @constructor
* @param target {Object} The target object that the event is called on
* @param name {String} The string name of the event that was triggered
* @param data {Object} Arbitrary event data to pass along
*/
PIXI.Event = function(target, name, data) {
//for duck typing in the ".on()" function
this.__isEventObject = true;
/**
* Tracks the state of bubbling propagation. Do not
* set this directly, instead use `event.stopPropagation()`
*
* @property stopped
* @type Boolean
* @private
* @readOnly
*/
this.stopped = false;
/**
* Tracks the state of sibling listener propagation. Do not
* set this directly, instead use `event.stopImmediatePropagation()`
*
* @property stoppedImmediate
* @type Boolean
* @private
* @readOnly
*/
this.stoppedImmediate = false;
/**
* The original target the event triggered on.
*
* @property target
* @type Object
* @readOnly
*/
this.target = target;
/**
* The string name of the event that this represents.
*
* @property type
* @type String
* @readOnly
*/
this.type = name;
/**
* The data that was passed in with this event.
*
* @property data
* @type Object
* @readOnly
*/
this.data = data;
//backwards compat with older version of events
this.content = data;
/**
* The timestamp when the event occurred.
*
* @property timeStamp
* @type Number
* @readOnly
*/
this.timeStamp = Date.now();
};
/**
* Stops the propagation of events up the scene graph (prevents bubbling).
*
* @method stopPropagation
*/
PIXI.Event.prototype.stopPropagation = function stopPropagation() {
this.stopped = true;
};
/**
* Stops the propagation of events to sibling listeners (no longer calls any listeners).
*
* @method stopImmediatePropagation
*/
PIXI.Event.prototype.stopImmediatePropagation = function stopImmediatePropagation() {
this.stoppedImmediate = true;
};
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