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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 propName in o) { | |
| var hasOwn = function(o, name) { | |
| !__hasOwn.call(o, name) | |
| } | |
| if (hasOwn(o,propName) { | |
| continue; | |
| }; | |
| var innerFunc = 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; | |
| } | |
| innerFunc(propName); | |
| } | |
| 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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