+/*****************************************************************************
+ * events.c: events interface
+ * This library provides an interface to the send and receive events.
+ * It is more lightweight than variable based callback.
+ * Methode
+ *****************************************************************************
+ * Copyright (C) 1998-2005 the VideoLAN team
+ * $Id$
+ *
+ * Authors: Pierre d'Herbemont <pdherbemont # videolan.org >
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+/*****************************************************************************
+ * Preamble
+ *****************************************************************************/
+
+#include <vlc/vlc.h>
+
+#include <stdio.h> /* required */
+#include <stdlib.h> /* malloc() */
+
+#include <assert.h>
+
+#include <vlc_events.h>
+#include <vlc_arrays.h>
+
+/*****************************************************************************
+ * Documentation : Read vlc_events.h
+ *****************************************************************************/
+
+/*****************************************************************************
+ * Private types.
+ *****************************************************************************/
+
+typedef struct vlc_event_listener_t
+{
+ void * p_user_data;
+ vlc_event_callback_t pf_callback;
+} vlc_event_listener_t;
+
+typedef struct vlc_event_listeners_group_t
+{
+ vlc_event_type_t event_type;
+ DECL_ARRAY(struct vlc_event_listener_t *) listeners;
+} vlc_event_listeners_group_t;
+
+/*****************************************************************************
+ *
+ *****************************************************************************/
+
+/**
+ * Initialize event manager object
+ * p_this is the object that contains the event manager. But not
+ * necessarily a vlc_object_t (an input_item_t is not a vlc_object_t
+ * for instance).
+ */
+int event_manager_Create( vlc_event_manager_t * p_em, void * p_obj )
+{
+ p_em->p_obj = p_obj;
+ ARRAY_INIT( p_em->listeners_groups );
+ return VLC_SUCCESS;
+}
+
+/**
+ * Destroy the event manager
+ */
+void event_manager_Destroy( vlc_event_manager_t * p_em )
+{
+ struct vlc_event_listeners_group_t * listeners_group;
+ struct vlc_event_listener_t * listener;
+
+ FOREACH_ARRAY( listeners_group, p_em->listeners_groups )
+ FOREACH_ARRAY( listener, listeners_group->listeners )
+ free( listener );
+ FOREACH_END()
+ free( listeners_group );
+ FOREACH_END()
+ free( p_em );
+}
+
+/**
+ * Destroy the event manager
+ */
+int event_manager_RegisterEventType(
+ vlc_event_manager_t * p_em,
+ vlc_event_type_t event_type )
+{
+ vlc_event_listeners_group_t * listeners_group;
+ listeners_group = malloc(sizeof(vlc_event_listeners_group_t));
+
+ if( !listeners_group )
+ return VLC_ENOMEM;
+
+ listeners_group->event_type = event_type;
+ ARRAY_INIT( listeners_group->listeners );
+
+ ARRAY_APPEND( p_em->listeners_groups, listeners_group );
+
+ return VLC_SUCCESS;
+}
+
+/**
+ * Send an event to the listener attached to this p_em.
+ */
+void event_Send( vlc_event_manager_t * p_em,
+ vlc_event_t * p_event )
+{
+ vlc_event_listeners_group_t * listeners_group;
+ vlc_event_listener_t * listener;
+
+ /* Fill event with the sending object now */
+ p_event->p_obj = p_em->p_obj;
+
+ FOREACH_ARRAY( listeners_group, p_em->listeners_groups )
+ if( listeners_group->event_type == p_event->type )
+ {
+ /* We found the group, now send every one the event */
+ FOREACH_ARRAY( listener, listeners_group->listeners )
+ listener->pf_callback( p_event, listener->p_user_data );
+ FOREACH_END()
+ break;
+ }
+ FOREACH_END()
+}
+
+/**
+ * Add a callback for an event.
+ */
+int event_Attach( vlc_event_manager_t * p_event_manager,
+ vlc_event_type_t event_type,
+ vlc_event_callback_t pf_callback,
+ void *p_user_data )
+{
+ vlc_event_listeners_group_t * listeners_group;
+ vlc_event_listener_t * listener;
+ listener = malloc(sizeof(vlc_event_listener_t));
+ if( !listener )
+ return VLC_ENOMEM;
+
+ listener->p_user_data = p_user_data;
+ listener->pf_callback = pf_callback;
+
+ FOREACH_ARRAY( listeners_group, p_event_manager->listeners_groups )
+ if( listeners_group->event_type == event_type )
+ {
+ ARRAY_APPEND( listeners_group->listeners, listener );
+ return VLC_SUCCESS;
+ }
+ FOREACH_END()
+
+ free(listener);
+ return VLC_EGENERIC;
+}
+
+/**
+ * Remove a callback for an event.
+ */
+int event_Detach( vlc_event_manager_t *p_event_manager,
+ vlc_event_type_t event_type,
+ vlc_event_callback_t pf_callback,
+ void *p_user_data )
+{
+ vlc_event_listeners_group_t * listeners_group;
+ struct vlc_event_listener_t * listener;
+ FOREACH_ARRAY( listeners_group, p_event_manager->listeners_groups )
+ if( listeners_group->event_type == event_type )
+ {
+ FOREACH_ARRAY( listener, listeners_group->listeners )
+ if( listener->pf_callback == pf_callback &&
+ listener->p_user_data == p_user_data )
+ {
+ /* that's our listener */
+ free( listener );
+ ARRAY_REMOVE( listeners_group->listeners,
+ fe_idx /* This comes from the macro (and that's why
+ I hate macro) */ );
+ return VLC_SUCCESS;
+ }
+ FOREACH_END()
+ }
+ FOREACH_END()
+
+ return VLC_EGENERIC;
+}
+
+