EnumValue.hs


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

A structure which contains a single enum value, its name, and its
nickname.
-}

module GI.GObject.Structs.EnumValue
    ( 

-- * Exported types
    EnumValue(..)                           ,
    newZeroEnumValue                        ,
    noEnumValue                             ,


 -- * Properties
-- ** Value
    enumValueReadValue                      ,


-- ** ValueName
    enumValueReadValueName                  ,


-- ** ValueNick
    enumValueReadValueNick                  ,




    ) 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.GObject.Types
import GI.GObject.Callbacks

newtype EnumValue = EnumValue (ForeignPtr EnumValue)
-- | Construct a `EnumValue` struct initialized to zero.
newZeroEnumValue :: MonadIO m => m EnumValue
newZeroEnumValue = liftIO $ callocBytes 24 >>= wrapPtr EnumValue

noEnumValue :: Maybe EnumValue
noEnumValue = Nothing

enumValueReadValue :: EnumValue -> IO Int32
enumValueReadValue s = withManagedPtr s $ \ptr -> do
    val <- peek (ptr `plusPtr` 0) :: IO Int32
    return val

enumValueReadValueName :: EnumValue -> IO T.Text
enumValueReadValueName s = withManagedPtr s $ \ptr -> do
    val <- peek (ptr `plusPtr` 8) :: IO CString
    val' <- cstringToText val
    return val'

enumValueReadValueNick :: EnumValue -> IO T.Text
enumValueReadValueNick s = withManagedPtr s $ \ptr -> do
    val <- peek (ptr `plusPtr` 16) :: IO CString
    val' <- cstringToText val
    return val'

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

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

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