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|
{-# OPTIONS_HADDOCK hide #-}
-- -*-haskell-*-
-- -------------------- automatically generated file - do not edit ----------
-- Object hierarchy for the GIMP Toolkit (GTK) Binding for Haskell
--
-- Author : Axel Simon
--
-- Copyright (C) 2001-2005 Axel Simon
--
-- This library is free software; you can redistribute it and/or
-- modify it under the terms of the GNU Lesser General Public
-- License as published by the Free Software Foundation; either
-- version 2.1 of the License, or (at your option) any later version.
--
-- This library is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-- Lesser General Public License for more details.
--
-- #hide
-- |
-- Maintainer : gtk2hs-users@lists.sourceforge.net
-- Stability : provisional
-- Portability : portable (depends on GHC)
--
-- This file reflects the Gtk+ object hierarchy in terms of Haskell classes.
--
-- Note: the mk... functions were originally meant to simply be an alias
-- for the constructor. However, in order to communicate the destructor
-- of an object to objectNew, the mk... functions are now a tuple containing
-- Haskell constructor and the destructor function pointer. This hack avoids
-- changing all modules that simply pass mk... to objectNew.
--
module Media.Streaming.GStreamer.Core.MiniHierarchy (
module Media.Streaming.GStreamer.Core.MiniHierarchyBase,
Buffer(Buffer), BufferClass,
toBuffer,
mkBuffer, unBuffer,
castToBuffer, gTypeBuffer,
Event(Event), EventClass,
toEvent,
mkEvent, unEvent,
castToEvent, gTypeEvent,
Message(Message), MessageClass,
toMessage,
mkMessage, unMessage,
castToMessage, gTypeMessage,
Query(Query), QueryClass,
toQuery,
mkQuery, unQuery,
castToQuery, gTypeQuery
) where
import Foreign.ForeignPtr (ForeignPtr, castForeignPtr, unsafeForeignPtrToPtr)
import Foreign.C.Types (CULong, CUInt)
import System.Glib.GType (GType, typeInstanceIsA)
{#import Media.Streaming.GStreamer.Core.MiniHierarchyBase#}
{# context lib="gstreamer" prefix="gst" #}
-- The usage of foreignPtrToPtr should be safe as the evaluation will only be
-- forced if the object is used afterwards
--
castTo :: (MiniObjectClass obj, MiniObjectClass obj') => GType -> String
-> (obj -> obj')
castTo gtype objTypeName obj =
case toMiniObject obj of
gobj@(MiniObject objFPtr)
| typeInstanceIsA ((unsafeForeignPtrToPtr.castForeignPtr) objFPtr) gtype
-> unsafeCastMiniObject gobj
| otherwise -> error $ "Cannot cast object to " ++ objTypeName
-- ********************************************************************* Buffer
{#pointer *Buffer foreign newtype #} deriving (Eq,Ord)
mkBuffer = (Buffer, miniObjectUnref)
unBuffer (Buffer o) = o
class MiniObjectClass o => BufferClass o
toBuffer :: BufferClass o => o -> Buffer
toBuffer = unsafeCastMiniObject . toMiniObject
instance BufferClass Buffer
instance MiniObjectClass Buffer where
toMiniObject = MiniObject . castForeignPtr . unBuffer
unsafeCastMiniObject = Buffer . castForeignPtr . unMiniObject
castToBuffer :: MiniObjectClass obj => obj -> Buffer
castToBuffer = castTo gTypeBuffer "Buffer"
gTypeBuffer :: GType
gTypeBuffer =
{# call fun unsafe gst_buffer_get_type #}
-- ********************************************************************** Event
{#pointer *Event foreign newtype #} deriving (Eq,Ord)
mkEvent = (Event, miniObjectUnref)
unEvent (Event o) = o
class MiniObjectClass o => EventClass o
toEvent :: EventClass o => o -> Event
toEvent = unsafeCastMiniObject . toMiniObject
instance EventClass Event
instance MiniObjectClass Event where
toMiniObject = MiniObject . castForeignPtr . unEvent
unsafeCastMiniObject = Event . castForeignPtr . unMiniObject
castToEvent :: MiniObjectClass obj => obj -> Event
castToEvent = castTo gTypeEvent "Event"
gTypeEvent :: GType
gTypeEvent =
{# call fun unsafe gst_event_get_type #}
-- ******************************************************************** Message
{#pointer *Message foreign newtype #} deriving (Eq,Ord)
mkMessage = (Message, miniObjectUnref)
unMessage (Message o) = o
class MiniObjectClass o => MessageClass o
toMessage :: MessageClass o => o -> Message
toMessage = unsafeCastMiniObject . toMiniObject
instance MessageClass Message
instance MiniObjectClass Message where
toMiniObject = MiniObject . castForeignPtr . unMessage
unsafeCastMiniObject = Message . castForeignPtr . unMiniObject
castToMessage :: MiniObjectClass obj => obj -> Message
castToMessage = castTo gTypeMessage "Message"
gTypeMessage :: GType
gTypeMessage =
{# call fun unsafe gst_message_get_type #}
-- ********************************************************************** Query
{#pointer *Query foreign newtype #} deriving (Eq,Ord)
mkQuery = (Query, miniObjectUnref)
unQuery (Query o) = o
class MiniObjectClass o => QueryClass o
toQuery :: QueryClass o => o -> Query
toQuery = unsafeCastMiniObject . toMiniObject
instance QueryClass Query
instance MiniObjectClass Query where
toMiniObject = MiniObject . castForeignPtr . unQuery
unsafeCastMiniObject = Query . castForeignPtr . unMiniObject
castToQuery :: MiniObjectClass obj => obj -> Query
castToQuery = castTo gTypeQuery "Query"
gTypeQuery :: GType
gTypeQuery =
{# call fun unsafe gst_query_get_type #}
|
