Created
September 13, 2011 23:00
-
-
Save vstarck/1215421 to your computer and use it in GitHub Desktop.
Inyección de logica de eventos en objetos
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/** | |
* Eventiza el objeto, agregandole los | |
* metodos | |
* on | |
* emit | |
* removeListener | |
* | |
* @param {Object} | |
* @return {Object} | |
*/ | |
var eventize = (function() { | |
// Los metodos son unicos y se comparten | |
// entre todos los objetos donde se aplique | |
// la funcion | |
var on, emit, removeListener; | |
/** | |
* @param {String} event | |
* @param {Function} handler | |
* @param {Object} scope | |
* @return {Object} | |
*/ | |
on = function(event, handler, scope) { | |
var handlers = this.__handlers = this.__handlers || {}; | |
handlers[event] = handlers[event] || []; | |
handlers[event].push([handler, scope]); | |
return this; | |
}; | |
/** | |
* @param {String} event | |
* @param {...mixed} arguments | |
* @return {Object} | |
*/ | |
emit = function(event) { | |
var | |
handlers = (this.__handlers = this.__handlers || {})[event], | |
args = Array.prototype.slice.call(arguments, 1); | |
if(!handlers) { | |
return this; | |
} | |
for(var i = 0, l = handlers.length; i < l; i++) { | |
(function(fn, scope) { | |
fn.apply(scope, args); | |
})(handlers[i][0], handlers[i][1]); | |
} | |
return this; | |
}; | |
/** | |
* @param {String} event | |
* @param {Function} handler | |
* @return {Object} | |
*/ | |
removeListener = function(event, handler) { | |
if(!this.__handlers) { | |
return this; | |
} | |
if(!handler) { | |
delete this.__handlers[event]; | |
return this; | |
} | |
for(var i = 0, l = this.__handlers[event].length; i < l; i++) { | |
if(this.__handlers[event][i][0] === handler) { | |
this.__handlers[event].splice(i, 1); | |
} | |
} | |
return this; | |
}; | |
return function(obj) { | |
obj.on = on; | |
obj.emit = emit; | |
obj.removeListener = removeListener; | |
return obj; | |
}; | |
})(); | |
// Uso | |
var myObject = {}; | |
// Magic! | |
eventize(myObject); | |
// attach | |
myObject.on('foo', console.log); | |
// trigger | |
myObject.emit('foo', 1, 2, 'bar', {a:'b'}); // 1 2 bar Object { a="b"} | |
// detach | |
myObject.removeListener('foo', console.log); | |
// trigger | |
myObject.emit('foo', 1, 2, 'bar', {a:'b'}); // ... |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment