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|
{-# LANGUAGE CPP #-}
-- GIMP Toolkit (GTK) Binding for Haskell: binding to gstreamer -*-haskell-*-
--
-- Author : Peter Gavin
-- Created: 1-Apr-2007
--
-- Copyright (c) 2007 Peter Gavin
--
-- 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 3 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.
--
-- You should have received a copy of the GNU Lesser General Public
-- License along with this program. If not, see
-- <http://www.gnu.org/licenses/>.
--
-- GStreamer, the C library which this Haskell library depends on, is
-- available under LGPL Version 2. The documentation included with
-- this library is based on the original GStreamer documentation.
--
-- | Maintainer : gtk2hs-devel@lists.sourceforge.net
-- Stability : alpha
-- Portability : portable (depends on GHC)
module Media.Streaming.GStreamer.Core.Object (
Object,
ObjectClass,
castToObject,
gTypeObject,
objectGetFlags,
objectSetFlags,
objectUnsetFlags,
objectSetName,
objectGetName,
objectSetParent,
objectGetParent,
objectUnparent,
objectGetNamePrefix,
objectSetNamePrefix,
objectHasAncestor,
objectWithLock,
objectWithTrylock,
objectLock,
objectTrylock,
objectUnlock,
onObjectParentSet,
afterObjectParentSet,
onObjectParentUnset,
afterObjectParentUnset,
objectName
) where
import Control.Exception ( bracket,
bracket_ )
import Control.Monad ( liftM,
when )
import System.Glib.FFI
import System.Glib.GObject
import System.Glib.UTFString ( withUTFString
, readUTFString )
import System.Glib.Properties ( newAttrFromMaybeStringProperty )
import System.Glib.Attributes ( Attr )
import System.Glib.Signals
{#import Media.Streaming.GStreamer.Core.Types#}
{#import Media.Streaming.GStreamer.Core.Signals#}
{# context lib = "gstreamer" prefix = "gst" #}
objectGetFlags :: ObjectClass objectT
=> objectT
-> IO [ObjectFlags]
objectGetFlags = mkObjectGetFlags
objectSetFlags :: ObjectClass objectT
=> objectT
-> [ObjectFlags]
-> IO ()
objectSetFlags = mkObjectSetFlags
objectUnsetFlags :: ObjectClass objectT
=> objectT
-> [ObjectFlags]
-> IO ()
objectUnsetFlags = mkObjectUnsetFlags
objectSetName :: ObjectClass obj =>
obj
-> Maybe String
-> IO Bool
objectSetName obj name =
liftM toBool $ maybeWith withUTFString name $
{# call object_set_name #} (toObject obj)
objectGetName :: ObjectClass obj =>
obj
-> IO (Maybe String)
objectGetName obj =
{# call object_get_name #} (toObject obj) >>= maybePeek readUTFString
objectSetParent :: (ObjectClass obj,
ObjectClass parent) =>
obj
-> parent
-> IO Bool
objectSetParent obj parent =
liftM toBool $ {# call object_set_parent #} (toObject obj) (toObject parent)
objectGetParent :: ObjectClass obj =>
obj
-> IO (Maybe Object)
objectGetParent obj =
{# call object_get_parent #} (toObject obj) >>=
maybePeek takeObject
objectUnparent :: ObjectClass obj =>
obj
-> IO ()
objectUnparent obj =
{# call object_unparent #} $ toObject obj
objectGetNamePrefix :: ObjectClass obj =>
obj
-> IO (Maybe String)
objectGetNamePrefix obj =
{# call object_get_name_prefix #} (toObject obj) >>= maybePeek readUTFString
objectSetNamePrefix :: ObjectClass obj =>
obj
-> Maybe String
-> IO ()
objectSetNamePrefix obj namePrefix =
maybeWith withUTFString namePrefix $ {# call object_set_name_prefix #} (toObject obj)
objectHasAncestor :: (ObjectClass obj, ObjectClass obj') =>
obj
-> obj'
-> IO Bool
objectHasAncestor object ancestor =
liftM toBool $ {# call object_has_ancestor #} (toObject object) (toObject ancestor)
objectWithLock :: ObjectClass objectT =>
objectT
-> IO a
-> IO a
objectWithLock object action =
bracket_ (objectLock object)
(objectUnlock object)
action
objectWithTrylock :: ObjectClass objectT =>
objectT
-> IO a
-> IO (Maybe a)
objectWithTrylock object action =
bracket (objectTrylock object)
(\locked -> when locked $ objectUnlock object)
(\locked -> if locked
then liftM Just $ action
else return Nothing)
objectLock :: ObjectClass objectT =>
objectT
-> IO ()
objectLock object =
withObject (toObject object) cGstObjectLock
foreign import ccall unsafe "_hs_gst_object_lock"
cGstObjectLock :: Ptr Object
-> IO ()
objectTrylock :: ObjectClass objectT =>
objectT
-> IO Bool
objectTrylock object =
liftM toBool $ withObject (toObject object) cGstObjectTrylock
foreign import ccall unsafe "_hs_gst_object_trylock"
cGstObjectTrylock :: Ptr Object
-> IO {# type gboolean #}
objectUnlock :: ObjectClass objectT =>
objectT
-> IO ()
objectUnlock object =
withObject (toObject object) cGstObjectUnlock
foreign import ccall unsafe "_hs_gst_object_unlock"
cGstObjectUnlock :: Ptr Object
-> IO ()
onObjectParentSet, afterObjectParentSet :: ObjectClass objectT
=> objectT
-> (GObject -> IO ())
-> IO (ConnectId objectT)
onObjectParentSet =
connect_OBJECT__NONE "parent-set" False
afterObjectParentSet =
connect_OBJECT__NONE "parent-set" True
onObjectParentUnset, afterObjectParentUnset :: ObjectClass objectT
=> objectT
-> (GObject -> IO ())
-> IO (ConnectId objectT)
onObjectParentUnset =
connect_OBJECT__NONE "parent-unset" False
afterObjectParentUnset =
connect_OBJECT__NONE "parent-unset" True
objectName :: ObjectClass objectT
=> Attr objectT (Maybe String)
objectName = newAttrFromMaybeStringProperty "name"
|
