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|
{-# OPTIONS_HADDOCK hide #-}
-- -*-haskell-*-
-- -------------------- automatically generated file - do not edit ------------
-- Callback installers for the GIMP Toolkit (GTK) Binding for Haskell
--
-- Author : Axel Simon
--
-- Created: 1 July 2000
--
-- Copyright (C) 2000-2005 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
-- These functions are used to connect signals to widgets. They are auto-
-- matically created through HookGenerator.hs which takes a list of possible
-- function signatures that are included in the GTK sources (gtkmarshal.list).
--
-- The object system in the second version of GTK is based on GObject from
-- GLIB. This base class is rather primitive in that it only implements
-- ref and unref methods (and others that are not interesting to us). If
-- the marshall list mentions OBJECT it refers to an instance of this
-- GObject which is automatically wrapped with a ref and unref call.
-- Structures which are not derived from GObject have to be passed as
-- BOXED which gives the signal connect function a possibility to do the
-- conversion into a proper ForeignPtr type. In special cases the signal
-- connect function use a PTR type which will then be mangled in the
-- user function directly. The latter is needed if a signal delivers a
-- pointer to a string and its length in a separate integer.
--
module Media.Streaming.GStreamer.Core.Signals (
module System.Glib.Signals,
connect_NONE__NONE,
connect_OBJECT__NONE,
connect_BOXED__NONE,
) where
import Control.Monad (liftM)
import System.Glib.FFI
import System.Glib.UTFString (peekUTFString,maybePeekUTFString)
import System.Glib.GError (failOnGError)
{#import System.Glib.Signals#}
{#import System.Glib.GObject#}
{#context lib="gtk" prefix="gtk" #}
-- Here are the generators that turn a Haskell function into
-- a C function pointer. The fist Argument is always the widget,
-- the last one is the user g_pointer. Both are ignored.
connect_NONE__NONE ::
GObjectClass obj => SignalName ->
ConnectAfter -> obj ->
(IO ()) ->
IO (ConnectId obj)
connect_NONE__NONE signal after obj user =
connectGeneric signal after obj action
where action :: Ptr GObject -> IO ()
action _ =
failOnGError $
user
connect_OBJECT__NONE ::
(GObjectClass a', GObjectClass obj) => SignalName ->
ConnectAfter -> obj ->
(a' -> IO ()) ->
IO (ConnectId obj)
connect_OBJECT__NONE signal after obj user =
connectGeneric signal after obj action
where action :: Ptr GObject -> Ptr GObject -> IO ()
action _ obj1 =
failOnGError $
makeNewGObject (GObject, objectUnref) (return obj1) >>= \obj1' ->
user (unsafeCastGObject obj1')
connect_BOXED__NONE ::
GObjectClass obj => SignalName ->
(Ptr a' -> IO a) ->
ConnectAfter -> obj ->
(a -> IO ()) ->
IO (ConnectId obj)
connect_BOXED__NONE signal boxedPre1 after obj user =
connectGeneric signal after obj action
where action :: Ptr GObject -> Ptr () -> IO ()
action _ box1 =
failOnGError $
boxedPre1 (castPtr box1) >>= \box1' ->
user box1'
|
