{-# LANGUAGE ForeignFunctionInterface, TypeFamilies, MultiParamTypeClasses, 
             FlexibleInstances, TypeSynonymInstances, 
             EmptyDataDecls, ExistentialQuantification, ScopedTypeVariables #-}

-- module HROOT.Class.Interface where

module HROOT.Class.TButton.Interface where


import Data.Word
import Foreign.ForeignPtr
import HROOT.TypeCast

import HROOT.Class.TButton.RawType

import HROOT.Class.TPad.Interface
import HROOT.Class.TAttText.Interface


class (ITPad a,ITAttText a) => ITButton a where

instance Existable TButton where
  data Exist TButton = forall a. (FPtr a, ITButton a) => ETButton a

upcastTButton :: (FPtr a, ITButton a) => a -> TButton
upcastTButton h = let fh = get_fptr h
                      fh2 :: ForeignPtr RawTButton = castForeignPtr fh
                  in cast_fptr_to_obj fh2