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

The PangoGlyphVisAttr is used to communicate information between
the shaping phase and the rendering phase.  More attributes may be
added in the future.
-}

module GI.Pango.Structs.GlyphVisAttr
    ( 

-- * Exported types
    GlyphVisAttr(..)                        ,
    newZeroGlyphVisAttr                     ,
    noGlyphVisAttr                          ,


 -- * Properties
-- ** isClusterStart #attr:isClusterStart#
    getGlyphVisAttrIsClusterStart           ,
    glyphVisAttr_isClusterStart             ,
    setGlyphVisAttrIsClusterStart           ,




    ) where

import Data.GI.Base.ShortPrelude
import qualified Data.GI.Base.ShortPrelude as SP
import qualified Data.GI.Base.Overloading as O
import qualified Prelude as P

import qualified Data.GI.Base.Attributes as GI.Attributes
import qualified Data.GI.Base.ManagedPtr as B.ManagedPtr
import qualified Data.GI.Base.GError as B.GError
import qualified Data.GI.Base.GVariant as B.GVariant
import qualified Data.GI.Base.GParamSpec as B.GParamSpec
import qualified Data.GI.Base.CallStack as B.CallStack
import qualified Data.Text as T
import qualified Data.ByteString.Char8 as B
import qualified Data.Map as Map
import qualified Foreign.Ptr as FP


newtype GlyphVisAttr = GlyphVisAttr (ManagedPtr GlyphVisAttr)
instance WrappedPtr GlyphVisAttr where
    wrappedPtrCalloc = callocBytes 4
    wrappedPtrCopy = \p -> withManagedPtr p (copyBytes 4 >=> wrapPtr GlyphVisAttr)
    wrappedPtrFree = Just ptr_to_g_free

-- | Construct a `GlyphVisAttr` struct initialized to zero.
newZeroGlyphVisAttr :: MonadIO m => m GlyphVisAttr
newZeroGlyphVisAttr = liftIO $ wrappedPtrCalloc >>= wrapPtr GlyphVisAttr

instance tag ~ 'AttrSet => Constructible GlyphVisAttr tag where
    new _ attrs = do
        o <- newZeroGlyphVisAttr
        GI.Attributes.set o attrs
        return o


noGlyphVisAttr :: Maybe GlyphVisAttr
noGlyphVisAttr = Nothing

getGlyphVisAttrIsClusterStart :: MonadIO m => GlyphVisAttr -> m Word32
getGlyphVisAttrIsClusterStart s = liftIO $ withManagedPtr s $ \ptr -> do
    val <- peek (ptr `plusPtr` 0) :: IO Word32
    return val

setGlyphVisAttrIsClusterStart :: MonadIO m => GlyphVisAttr -> Word32 -> m ()
setGlyphVisAttrIsClusterStart s val = liftIO $ withManagedPtr s $ \ptr -> do
    poke (ptr `plusPtr` 0) (val :: Word32)

data GlyphVisAttrIsClusterStartFieldInfo
instance AttrInfo GlyphVisAttrIsClusterStartFieldInfo where
    type AttrAllowedOps GlyphVisAttrIsClusterStartFieldInfo = '[ 'AttrSet, 'AttrGet]
    type AttrSetTypeConstraint GlyphVisAttrIsClusterStartFieldInfo = (~) Word32
    type AttrBaseTypeConstraint GlyphVisAttrIsClusterStartFieldInfo = (~) GlyphVisAttr
    type AttrGetType GlyphVisAttrIsClusterStartFieldInfo = Word32
    type AttrLabel GlyphVisAttrIsClusterStartFieldInfo = "is_cluster_start"
    type AttrOrigin GlyphVisAttrIsClusterStartFieldInfo = GlyphVisAttr
    attrGet _ = getGlyphVisAttrIsClusterStart
    attrSet _ = setGlyphVisAttrIsClusterStart
    attrConstruct = undefined
    attrClear _ = undefined

glyphVisAttr_isClusterStart :: AttrLabelProxy "isClusterStart"
glyphVisAttr_isClusterStart = AttrLabelProxy



instance O.HasAttributeList GlyphVisAttr
type instance O.AttributeList GlyphVisAttr = GlyphVisAttrAttributeList
type GlyphVisAttrAttributeList = ('[ '("isClusterStart", GlyphVisAttrIsClusterStartFieldInfo)] :: [(Symbol, *)])

type family ResolveGlyphVisAttrMethod (t :: Symbol) (o :: *) :: * where
    ResolveGlyphVisAttrMethod l o = O.MethodResolutionFailed l o

instance (info ~ ResolveGlyphVisAttrMethod t GlyphVisAttr, O.MethodInfo info GlyphVisAttr p) => O.IsLabelProxy t (GlyphVisAttr -> p) where
    fromLabelProxy _ = O.overloadedMethod (O.MethodProxy :: O.MethodProxy info)

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