JooseX.Attribute.Dirty.js

/**
 * class JooseX.Attribute.Dirty
 *
 * Add _isDirty_ property if an attribute has been changed with setter method.
 *
 **/
Role('JooseX.Attribute.Dirty', {

  override : {

    getSetter : function() {
      var self      = this
      var original  = self.SUPER()
      var init      = Joose.O.isFunction(self.init) ? null : self.init

      if ( !self.writeable ) return original

      return function () {
        var oldValue    = self.hasValue(this) ? self.getValueFrom(this) : init
        var res         = original.apply(this, arguments)
        var newValue    = self.getValueFrom(res)

        if ( !this.isDirty ) this.isDirty = ( newValue != oldValue )

        return res
      }
    }
  }

})

Joose.Managed.Attribute.meta.extend({
    does : [ JooseX.Attribute.Dirty ]
})