Created
October 27, 2011 03:17
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Xamlizer - a way to implement INotifyPropertyChang* in JavaScript!
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var xamlizer = (function() { | |
'use strict'; | |
var __hasOwn = Object.prototype.hasOwnProperty; | |
var propSkeleton = function() { | |
this.enumerable = true; | |
this.configurable = true; | |
//this.writable = true; | |
}; | |
return function(o) { | |
var propertyChanging, propertyChanged, prop, value, | |
locals = {}, | |
_propertyChanged = [], | |
_propertyChanging = []; | |
propertyChanging = function(name) { | |
for(var i = 0, il = _propertyChanging.length; i < il; i++) { | |
_propertyChanging[i](o, name); | |
} | |
}; | |
propertyChanged = function(name) { | |
for(var i = 0, il = _propertyChanged.length; i < il; i++) { | |
_propertyChanged[i](o, name); | |
} | |
}; | |
for(var name in o) { | |
if (!__hasOwn.call(o, name)) { | |
continue; | |
}; | |
(function (name) { | |
prop = new propSkeleton(); | |
prop.get = function() { | |
return locals[name]; | |
}; | |
prop.set = function(val) { | |
if(val !== locals[name]) { | |
propertyChanging(name); | |
locals[name] = val; | |
propertyChanged(name); | |
} | |
} | |
value = o[name]; | |
Object.defineProperty(o, name, prop); | |
o[name] = value; | |
})(name); | |
} | |
o.addPropertyChanged = function(fn) { | |
_propertyChanged.push(fn); | |
}; | |
o.addPropertyChanging = function(fn) { | |
_propertyChanging.push(fn); | |
}; | |
o.removePropertyChanged = function(fn) { | |
var index = _propertyChanged.indexOf(fn); | |
if(index >= 0) { | |
_propertyChanged = _propertyChanged.slice(0, index).concat(_propertyChanged.slice(index + 1, _propertyChanged.length)); | |
} | |
}; | |
o.removePropertyChanging = function(fn) { | |
var index = _propertyChanging.indexOf(fn); | |
if(index >= 0) { | |
_propertyChanging = _propertyChanging.slice(0, index).concat(_propertyChanging.slice(index + 1, _propertyChanging.length)); | |
} | |
}; | |
}; | |
})(); |
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