AttrClass.hs


{- |
Copyright  : Will Thompson, Iñaki García Etxebarria and Jonas Platte
License    : LGPL-2.1
Maintainer : Iñaki García Etxebarria (garetxe@gmail.com)

The #PangoAttrClass structure stores the type and operations for
a particular type of attribute. The functions in this structure should
not be called directly. Instead, one should use the wrapper functions
provided for #PangoAttribute.
-}

module GI.Pango.Structs.AttrClass
    ( 

-- * Exported types
    AttrClass(..)                           ,
    newZeroAttrClass                        ,
    noAttrClass                             ,


 -- * Properties
-- ** Type
    attrClassReadType                       ,




    ) where

import Prelude ()
import Data.GI.Base.ShortPrelude

import qualified Data.Text as T
import qualified Data.ByteString.Char8 as B
import qualified Data.Map as Map

import GI.Pango.Types
import GI.Pango.Callbacks

newtype AttrClass = AttrClass (ForeignPtr AttrClass)
-- | Construct a `AttrClass` struct initialized to zero.
newZeroAttrClass :: MonadIO m => m AttrClass
newZeroAttrClass = liftIO $ callocBytes 32 >>= wrapPtr AttrClass

noAttrClass :: Maybe AttrClass
noAttrClass = Nothing

attrClassReadType :: AttrClass -> IO AttrType
attrClassReadType s = withManagedPtr s $ \ptr -> do
    val <- peek (ptr `plusPtr` 0) :: IO CUInt
    let val' = (toEnum . fromIntegral) val
    return val'

-- XXX Skipped getter for "AttrClass:destroy" :: Not implemented: "Wrapping foreign callbacks is not supported yet"

-- XXX Skipped getter for "AttrClass:equal" :: Not implemented: "Wrapping foreign callbacks is not supported yet"

type family ResolveAttrClassMethod (t :: Symbol) (o :: *) :: * where
    ResolveAttrClassMethod l o = MethodResolutionFailed l o

instance (info ~ ResolveAttrClassMethod t AttrClass, MethodInfo info AttrClass p) => IsLabelProxy t (AttrClass -> p) where
    fromLabelProxy _ = overloadedMethod (MethodProxy :: MethodProxy info)

#if MIN_VERSION_base(4,9,0)
instance (info ~ ResolveAttrClassMethod t AttrClass, MethodInfo info AttrClass p) => IsLabel t (AttrClass -> p) where
    fromLabel _ = overloadedMethod (MethodProxy :: MethodProxy info)
#endif