AttrFontDesc.hs


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

The #PangoAttrFontDesc structure is used to store an attribute that
sets all aspects of the font description at once.
-}

module GI.Pango.Structs.AttrFontDesc
    ( 

-- * Exported types
    AttrFontDesc(..)                        ,
    newZeroAttrFontDesc                     ,
    noAttrFontDesc                          ,


 -- * Properties
-- ** Attr
    attrFontDescReadAttr                    ,


-- ** Desc
    attrFontDescReadDesc                    ,




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

noAttrFontDesc :: Maybe AttrFontDesc
noAttrFontDesc = Nothing

attrFontDescReadAttr :: AttrFontDesc -> IO Attribute
attrFontDescReadAttr s = withManagedPtr s $ \ptr -> do
    val <- peek (ptr `plusPtr` 0) :: IO (Ptr Attribute)
    val' <- (newPtr 16 Attribute) val
    return val'

attrFontDescReadDesc :: AttrFontDesc -> IO FontDescription
attrFontDescReadDesc s = withManagedPtr s $ \ptr -> do
    val <- peek (ptr `plusPtr` 16) :: IO (Ptr FontDescription)
    val' <- (newBoxed FontDescription) val
    return val'

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

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

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