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@cocodrino
Forked from keeto/Signal.js
Created Jul 19, 2014
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/*
Script: Signal.js
Makes chaining functions easy!
License & Copyright:
Copyright 2009, Mark Obcena <keetology.com>
MIT-Style License
*/
(function(global){
this.Signal = new Class({
obj: global,
fn: $empty,
fnName: '$empty',
preStack: [],
postStack: [],
initialize: function(fn, obj){
obj = this.obj = obj || global;
if (typeof fn !== 'string'
&& !(obj[fn] instanceof Function)) throw new Error("No such function");
this.fnName = fn;
this.fn = obj[fn];
this.attach();
},
attach: function(){
var self = this;
this.obj[this.fnName] = function(){
for (var x = 0, y = self.preStack.length; x < y; x++){
var item = self.preStack[x];
item.obj[item.fn].apply(item.obj, arguments);
}
var result = self.fn.apply(self.obj, arguments);
for (var x = 0, y = self.postStack.length; x < y; x++){
var item = self.postStack[x];
item.obj[item.fn].apply(item.obj, arguments);
}
return result;
};
},
detach: function(){
this.obj[this.fnName] = this.fn;
},
connect: function(fn, obj, before){
obj = obj || global;
if (typeof fn !== 'string' && !(obj[fn] instanceof Function)) return;
this[before ? 'preStack' : 'postStack'].push({
obj: obj,
fn: fn
});
return this;
},
disconnect: function(fn, obj, before){
obj = obj || global;
var stack = before ? 'preStack' : 'postStack';
this[stack] = this[stack].filter(function(item){
return !(item.obj === obj && item.fn === fn);
});
return this;
}
});
})(this);
// Globals
var woot = function(msg){
console.log('Woot! ' + msg);
};
var yay = function(msg){
console.log('Yay! ' + msg);
};
var mySignal = new Signal('woot');
mySignal.connect('yay');
woot('test');
// Woot! test
// Yay! test
mySignal.disconnect('yay');
woot('test');
// Woot! test
// Methods
var A = {
woot: function(msg){
console.log('Woot! ' + msg);
}
};
var B = {
yay: function(msg){
console.log('Yay! ' + msg);
}
};
var mySignal = new Signal('woot', A);
mySignal.connect('yay', B);
A.woot('test');
// Woot! test
// Yay! test
mySignal.disconnect('yay', B);
A.woot('test');
// Woot! test
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