[Pyobjc-dev] FahrenheitToCelsiusTransformer

[ufiedler <ufi...@we...>]

Hi,

Now I am trying to convert the FahrenheitToCelsiusTransformer example  
from Apple
at  
file:///Developer/ADC%20Reference%20Library/documentation/Cocoa/ 
Conceptual/ValueTransformers/index.html.

The cocoa version I implemented works as expected. But the python  
version does not.

The registration of the transformer works fine. But  
allowsReverseTransformation is the
only method being called from FahrenheitToCelsiusTransformer?

I am using pyobjc 1.2.

Thanks
u.fiedler


class FahrenheitToCelsiusTransformer(NSValueTransformer):
	def transformedValueClass(self):
		f=1.2
		print "transformedValueClass", f.__class__
		return f.__class__
	transformedValueClass = accessor(transformedValueClass)
		
	def allowsReverseTransformation(self):
		print "allowsReverseTransformation"
		return NO
		
	def transformedValue(self, value):
		print "transformedValue", value
		if value == None: return None
		fahrenheitInputValue = value
		# calculate Celsius value
		celsiusOutputValue = (5.0/9.0)*(fahrenheitInputValue - 32.0)
		print "transformedValue", value, celsiusOutputValue
		return celsiusOutputValue

	def reverseTransformedValue(self, value):
		print "reverseTransformedValue", value
		if value == None: return None
		celsiusInputValue = value
		# calculate Fahrenheit value
		fahrenheitOutputValue = ((9.0/5.0) * celsiusInputValue) + 32.0
		return fahrenheitOutputValue


NibClassBuilder.extractClasses("MainMenu")
class TransformerAppDelegate(NibClassBuilder.AutoBaseClass):
	celsius = ivar('celsius', 'd')

	def initialize(self):
		print "initialize"
		# Registering the Fahrenheit to Celsius value transformer
		trans = FahrenheitToCelsiusTransformer.alloc().init()
		NSValueTransformer.setValueTransformer_forName_(trans,  
u"FahrenheitToCelsiusTransformer")
		
		# some tests
		print "   valueTransformerNames",  
NSValueTransformer.valueTransformerNames()
		print "   valueTransformerForName_",  
NSValueTransformer.valueTransformerForName_(u"FahrenheitToCelsiusTransfo 
rmer")
		print "   trans", trans
		print "   type trans", type(trans)
		print "   trans.", ; trans.transformedValueClass()
		print "   trans.", ; trans.transformedValue(4)