1/***********************************************************
2
3Copyright 1987, 1998  The Open Group
4
5Permission to use, copy, modify, distribute, and sell this software and its
6documentation for any purpose is hereby granted without fee, provided that
7the above copyright notice appear in all copies and that both that
8copyright notice and this permission notice appear in supporting
9documentation.
10
11The above copyright notice and this permission notice shall be included in
12all copies or substantial portions of the Software.
13
14THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
17OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
18AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
19CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
20
21Except as contained in this notice, the name of The Open Group shall not be
22used in advertising or otherwise to promote the sale, use or other dealings
23in this Software without prior written authorization from The Open Group.
24
25Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
26
27                        All Rights Reserved
28
29Permission to use, copy, modify, and distribute this software and its
30documentation for any purpose and without fee is hereby granted,
31provided that the above copyright notice appear in all copies and that
32both that copyright notice and this permission notice appear in
33supporting documentation, and that the name of Digital not be
34used in advertising or publicity pertaining to distribution of the
35software without specific, written prior permission.
36
37DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
38ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
39DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
40ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
41WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
42ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
43SOFTWARE.
44
45******************************************************************/
46
47#ifndef CALLBACK_H
48#define CALLBACK_H
49
50#include <X11/X.h>              /* for GContext, Mask */
51#include <X11/Xdefs.h>          /* for Bool */
52#include <X11/Xproto.h>
53#include <X11/Xfuncproto.h>
54
55/*
56 *  callback manager stuff
57 */
58
59#ifndef _XTYPEDEF_CALLBACKLISTPTR
60typedef struct _CallbackList *CallbackListPtr;  /* also in misc.h */
61
62#define _XTYPEDEF_CALLBACKLISTPTR
63#endif
64
65typedef void (*CallbackProcPtr) (CallbackListPtr *, void *, void *);
66
67extern _X_EXPORT Bool AddCallback(CallbackListPtr *pcbl,
68                                  CallbackProcPtr callback,
69                                  void *data);
70
71extern _X_EXPORT Bool DeleteCallback(CallbackListPtr *pcbl,
72                                     CallbackProcPtr callback,
73                                     void *data);
74
75extern _X_EXPORT void _CallCallbacks(CallbackListPtr *pcbl,
76                                     void *call_data);
77
78static inline void
79CallCallbacks(CallbackListPtr *pcbl, void *call_data)
80{
81    if (!pcbl || !*pcbl)
82        return;
83    _CallCallbacks(pcbl, call_data);
84}
85
86extern _X_EXPORT void DeleteCallbackList(CallbackListPtr *pcbl);
87
88extern _X_EXPORT void InitCallbackManager(void);
89extern _X_EXPORT void DeleteCallbackManager(void);
90
91#endif                          /* CALLBACK_H */
92