EventProperty.hs


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

Describes a property change on a window.
-}

module GI.Gdk.Structs.EventProperty
    ( 

-- * Exported types
    EventProperty(..)                       ,
    newZeroEventProperty                    ,
    noEventProperty                         ,


 -- * Properties
-- ** Atom
    eventPropertyReadAtom                   ,


-- ** SendEvent
    eventPropertyReadSendEvent              ,


-- ** State
    eventPropertyReadState                  ,


-- ** Time
    eventPropertyReadTime                   ,


-- ** Type
    eventPropertyReadType                   ,


-- ** Window
    eventPropertyReadWindow                 ,




    ) 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.Gdk.Types
import GI.Gdk.Callbacks

newtype EventProperty = EventProperty (ForeignPtr EventProperty)
-- | Construct a `EventProperty` struct initialized to zero.
newZeroEventProperty :: MonadIO m => m EventProperty
newZeroEventProperty = liftIO $ callocBytes 40 >>= wrapPtr EventProperty

noEventProperty :: Maybe EventProperty
noEventProperty = Nothing

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

eventPropertyReadWindow :: EventProperty -> IO Window
eventPropertyReadWindow s = withManagedPtr s $ \ptr -> do
    val <- peek (ptr `plusPtr` 8) :: IO (Ptr Window)
    val' <- (newObject Window) val
    return val'

eventPropertyReadSendEvent :: EventProperty -> IO Int8
eventPropertyReadSendEvent s = withManagedPtr s $ \ptr -> do
    val <- peek (ptr `plusPtr` 16) :: IO Int8
    return val

eventPropertyReadAtom :: EventProperty -> IO Atom
eventPropertyReadAtom s = withManagedPtr s $ \ptr -> do
    val <- peek (ptr `plusPtr` 24) :: IO (Ptr Atom)
    -- XXX Wrapping a foreign struct/union with no known destructor, leak?
    val' <- (\x -> Atom <$> newForeignPtr_ x) val
    return val'

eventPropertyReadTime :: EventProperty -> IO Word32
eventPropertyReadTime s = withManagedPtr s $ \ptr -> do
    val <- peek (ptr `plusPtr` 32) :: IO Word32
    return val

eventPropertyReadState :: EventProperty -> IO PropertyState
eventPropertyReadState s = withManagedPtr s $ \ptr -> do
    val <- peek (ptr `plusPtr` 36) :: IO CUInt
    let val' = (toEnum . fromIntegral) val
    return val'

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

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

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