2 * This file is part of DisOrder
3 * Copyright (C) 2008 Richard Kettlewell
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
22 #include "eventdist.h"
26 struct event_data
*next
;
28 event_handler
*callback
;
34 /** @brief Register an event handler
35 * @param event Event type to handle
36 * @param callback Function to call when event occurs
37 * @param callbackdata Passed to @p callback
38 * @return Handle for this registration (for use with event_cancel())
40 event_handle
event_register(const char *event
,
41 event_handler
*callback
,
43 static const struct event_data
*null
;
44 struct event_data
*ed
= xmalloc(sizeof *ed
), **head
;
47 events
= hash_new(sizeof (struct event_data
*));
48 if(!(head
= hash_find(events
, event
))) {
49 hash_add(events
, event
, &null
, HASH_INSERT
);
50 head
= hash_find(events
, event
);
53 ed
->event
= xstrdup(event
);
54 ed
->callback
= callback
;
55 ed
->callbackdata
= callbackdata
;
60 /** @brief Stop handling an event
61 * @param handle Registration to cancel (as returned from event_register())
63 * @p handle is allowed to be NULL.
65 void event_cancel(event_handle handle
) {
66 struct event_data
**head
, **edp
;
71 head
= hash_find(events
, handle
->event
);
72 for(edp
= head
; *edp
&& *edp
!= handle
; edp
= &(*edp
)->next
)
74 assert(*edp
== handle
);
78 /** @brief Raise an event
79 * @param event Event type to raise
80 * @param eventdata Event-specific data
82 void event_raise(const char *event
,
84 struct event_data
*ed
, **head
;
87 if(!(head
= hash_find(events
, event
)))
89 for(ed
= *head
; ed
; ed
= ed
->next
)
90 ed
->callback(event
, eventdata
, ed
->callbackdata
);