2013-04-17 19:27:26 -04:00
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/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C) 2012,2013 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef _COGL_CLOSURE_LIST_PRIVATE_H_
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#define _COGL_CLOSURE_LIST_PRIVATE_H_
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#include "cogl-object.h"
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2013-06-08 18:03:25 -04:00
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#include "cogl-list.h"
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2013-04-17 19:27:26 -04:00
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/*
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* This implements a list of callbacks that can be used a bit like
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* signals in GObject, but that don't have any marshalling overhead.
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*
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* The idea is that any Cogl code that wants to provide a callback
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* point will provide api to add a callback for that particular point.
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* The function can take a function pointer with the correct
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* signature. Internally the Cogl code can use _cogl_closure_list_add,
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* _cogl_closure_disconnect and _cogl_closure_list_disconnect_all
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*
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* In the future we could consider exposing the CoglClosure type which
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* would allow applications to use _cogl_closure_disconnect() directly
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* so we don't need to expose new disconnect apis for each callback
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* point.
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*/
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typedef struct _CoglClosure
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{
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CoglList link;
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2013-04-17 19:27:26 -04:00
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void *function;
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void *user_data;
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CoglUserDataDestroyCallback destroy_cb;
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} CoglClosure;
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2013-04-17 19:27:26 -04:00
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/*
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* _cogl_closure_disconnect:
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* @closure: A closure connected to a Cogl closure list
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*
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* Removes the given closure from the callback list it is connected to
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* and destroys it. If the closure was created with a destroy function
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* then it will be invoked. */
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void
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_cogl_closure_disconnect (CoglClosure *closure);
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void
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_cogl_closure_list_disconnect_all (CoglList *list);
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CoglClosure *
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_cogl_closure_list_add (CoglList *list,
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void *function,
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void *user_data,
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CoglUserDataDestroyCallback destroy_cb);
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/*
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* _cogl_closure_list_invoke:
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* @list: A pointer to a CoglList containing CoglClosures
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* @cb_type: The name of a typedef for the closure callback function signature
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* @...: The the arguments to pass to the callback
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*
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2013-04-18 09:19:43 -04:00
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* A convenience macro to invoke a closure list with a variable number
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* of arguments that will be passed to the closure callback functions.
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2013-04-17 19:27:26 -04:00
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*
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* Note that the arguments will be evaluated multiple times so it is
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* not safe to pass expressions that have side-effects.
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*
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* Note also that this function ignores the return value from the
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* callbacks. If you want to handle the return value you should
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* manually iterate the list and invoke the callbacks yourself.
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*/
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#define _cogl_closure_list_invoke(list, cb_type, ...) \
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G_STMT_START { \
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CoglClosure *_c, *_tmp; \
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\
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_cogl_list_for_each_safe (_c, _tmp, (list), link) \
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{ \
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cb_type _cb = _c->function; \
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_cb (__VA_ARGS__, _c->user_data); \
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} \
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} G_STMT_END
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2013-06-08 18:03:25 -04:00
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#define _cogl_closure_list_invoke_no_args(list) \
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G_STMT_START { \
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CoglClosure *_c, *_tmp; \
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\
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_cogl_list_for_each_safe (_c, _tmp, (list), link) \
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{ \
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void (*_cb)(void *) = _c->function; \
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_cb (_c->user_data); \
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} \
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2013-04-18 09:19:43 -04:00
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} G_STMT_END
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2013-04-17 19:27:26 -04:00
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#endif /* _COGL_CLOSURE_LIST_PRIVATE_H_ */
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