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events.js
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events.js
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var Events = function() {
this.events = { };
}
Events.prototype.on = function(name, fn) {
var events = this.events[name];
if (!events) {
events = this.events[name] = [ fn ];
} else {
if (events.indexOf(fn) == -1) {
events.push(fn);
}
}
return this;
};
Events.prototype.once = function(name, fn) {
var events = this.events[name];
fn.once = true;
if (!events) {
events = this.events[name] = [ fn ];
} else {
if (events.indexOf(fn) == -1) {
events.push(fn);
}
}
return this;
};
Events.prototype.emit = function(name, args) {
var events = this.events[name];
if (events) {
var i = events.length;
while(i--) {
if (events[i]) {
events[i].apply(this, [ args ]);
if (events[i].once) {
delete events[i];
}
}
}
}
return this;
};
Events.prototype.unbind = function(name, fn) {
if (name) {
var events = this.events[name];
if (events) {
if (fn) {
var i = events.indexOf(fn);
if (i != -1) {
delete events[i];
}
} else {
delete this.events[name];
}
}
} else {
delete this.events;
this.events = { };
}
return this;
}
// global events
var events = new Events();
events.add = function(obj) {
obj.events = { };
}
events.implement = function(fn) {
fn.prototype = Object.create(Events.prototype);
}