RequestedSize.hs


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

Represents a request of a screen object in a given orientation. These
are primarily used in container implementations when allocating a natural
size for children calling. See gtk_distribute_natural_allocation().
-}

module GI.Gtk.Structs.RequestedSize
    ( 

-- * Exported types
    RequestedSize(..)                       ,
    newZeroRequestedSize                    ,
    noRequestedSize                         ,


 -- * Properties
-- ** Data
    requestedSizeReadData                   ,


-- ** MinimumSize
    requestedSizeReadMinimumSize            ,


-- ** NaturalSize
    requestedSizeReadNaturalSize            ,




    ) 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.Gtk.Types
import GI.Gtk.Callbacks

newtype RequestedSize = RequestedSize (ForeignPtr RequestedSize)
-- | Construct a `RequestedSize` struct initialized to zero.
newZeroRequestedSize :: MonadIO m => m RequestedSize
newZeroRequestedSize = liftIO $ callocBytes 16 >>= wrapPtr RequestedSize

noRequestedSize :: Maybe RequestedSize
noRequestedSize = Nothing

requestedSizeReadData :: RequestedSize -> IO (Ptr ())
requestedSizeReadData s = withManagedPtr s $ \ptr -> do
    val <- peek (ptr `plusPtr` 0) :: IO (Ptr ())
    return val

requestedSizeReadMinimumSize :: RequestedSize -> IO Int32
requestedSizeReadMinimumSize s = withManagedPtr s $ \ptr -> do
    val <- peek (ptr `plusPtr` 8) :: IO Int32
    return val

requestedSizeReadNaturalSize :: RequestedSize -> IO Int32
requestedSizeReadNaturalSize s = withManagedPtr s $ \ptr -> do
    val <- peek (ptr `plusPtr` 12) :: IO Int32
    return val

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

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

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