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2ce0cf3861
This adds a convenience COGL_OBJECT macro for casting CoglObject subclasses to (CoglObject *) pointers.
127 lines
3.8 KiB
C
127 lines
3.8 KiB
C
/*
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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) 2009,2010 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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*/
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#ifndef __COGL_OBJECT_H
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#define __COGL_OBJECT_H
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typedef struct _CoglObject CoglObject;
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#define COGL_OBJECT(X) ((CoglObject *)X)
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/**
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* CoglUserDataKey:
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* @unused: ignored.
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*
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* A #CoglUserDataKey is used to declare a key for attaching data to a
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* #CoglObject using cogl_object_set_user_data. The typedef only exists as a
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* formality to make code self documenting since only the unique address of a
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* #CoglUserDataKey is used.
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*
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* Typically you would declare a static #CoglUserDataKey and set private data
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* on an object something like this:
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*
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* |[
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* static CoglUserDataKey path_private_key;
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*
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* static void
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* destroy_path_private_cb (void *data)
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* {
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* g_free (data);
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* }
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*
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* static void
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* my_path_set_data (CoglPath *path, void *data)
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* {
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* cogl_object_set_user_data (COGL_OBJECT (path),
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* &private_key,
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* data,
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* destroy_path_private_cb);
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* }
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* ]|
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*
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* Since: 1.4
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*/
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typedef struct
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{
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int unused;
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} CoglUserDataKey;
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/**
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* CoglUserDataDestroyCallback:
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* @user_data: The data whos association with a #CoglObject has been
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* destoyed.
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*
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* When associating private data with a #CoglObject a callback can be
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* given which will be called either if the object is destroyed or if
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* cogl_object_set_user_data() is called with NULL user_data for the
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* same key.
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*
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* Since: 1.4
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*/
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typedef void (*CoglUserDataDestroyCallback) (void *user_data);
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/**
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* cogl_object_set_user_data:
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* @object: The object to associate private data with
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* @key: The address of a #CoglUserDataKey which provides a unique value
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* with which to index the private data.
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* @user_data: The data to associate with the given object, or NULL to
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* remove a previous association.
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* @destroy: A #CoglUserDataDestroyCallback to call if the object is
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* destroyed or if the association is removed by later setting
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* NULL data for the same key.
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*
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* Associates some private @user_data with a given #CoglObject. To
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* later remove the association call cogl_object_set_user_data() with
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* the same @key but NULL for the @user_data.
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*
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* Since: 1.4
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*/
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void
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cogl_object_set_user_data (CoglObject *object,
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CoglUserDataKey *key,
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void *user_data,
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CoglUserDataDestroyCallback destroy);
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/**
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* cogl_object_get_user_data:
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* @object: The object with associated private data to query
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* @key: The address of a #CoglUserDataKey which provides a unique value
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* with which to index the private data.
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*
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* Finds the user data previously associated with @object using
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* the given @key. If no user data has been associated with @object
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* for the given @key this function returns NULL.
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*
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* Returns: The user data previously associated with @object using
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* the given @key; or NULL if no associated data is found.
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*
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* Since: 1.4
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*/
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void *
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cogl_object_get_user_data (CoglObject *object,
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CoglUserDataKey *key);
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#endif /* __COGL_OBJECT_H */
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