moreutills-define.coffee

moreutills-define.coffee

Utils.define = (layer, property, value, callback, validation, error) ->
	validation ?= -> true
	error ?= "Layer #{layer.id}'s property '#{property}' was given the wrong value type."
	
	Object.defineProperty layer,
		property,
		get: -> return layer["_#{property}"]
		set: (value) ->
			if value?
				if not validation(value) then throw error
				return if value is layer["_#{property}"]

			layer["_#{property}"] = value
			layer.emit("change:#{property}", value, layer)
		configurable: true
			
	if callback? and typeof callback is 'function'
		layer.on("change:#{property}", callback)
	
	layer[property] = value