src/playlist/notify.h

   1 /*****************************************************************************
   2  * playlist/notify.h
   3  *****************************************************************************
   4  * Copyright (C) 2018 VLC authors and VideoLAN
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU Lesser General Public License as published by
   8  * the Free Software Foundation; either version 2.1 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  * GNU Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  19  *****************************************************************************/
  20
  21 #ifndef VLC_PLAYLIST_NOTIFY_H
  22 #define VLC_PLAYLIST_NOTIFY_H
  23
  24 #include <vlc_common.h>
  25 #include <vlc_list.h>
  26
  27 typedef struct vlc_playlist vlc_playlist_t;
  28
  29 struct vlc_playlist_listener_id
  30 {
  31     const struct vlc_playlist_callbacks *cbs;
  32     void *userdata;
  33     struct vlc_list node; /**< node of vlc_playlist.listeners */
  34 };
  35
  36 struct vlc_playlist_state {
  37     ssize_t current;
  38     bool has_prev;
  39     bool has_next;
  40 };
  41
  42 #define vlc_playlist_listener_foreach(listener, playlist) \
  43     vlc_list_foreach(listener, &(playlist)->listeners, node)
  44
  45 #define vlc_playlist_NotifyListener(playlist, listener, event, ...) \
  46 do { \
  47     if (listener->cbs->event) \
  48         listener->cbs->event(playlist, ##__VA_ARGS__, listener->userdata); \
  49 } while (0)
  50
  51 #define vlc_playlist_Notify(playlist, event, ...) \
  52 do { \
  53     vlc_playlist_AssertLocked(playlist); \
  54     vlc_playlist_listener_id *listener; \
  55     vlc_playlist_listener_foreach(listener, playlist) \
  56         vlc_playlist_NotifyListener(playlist, listener, event, ##__VA_ARGS__); \
  57 } while(0)
  58
  59 void
  60 vlc_playlist_state_Save(vlc_playlist_t *playlist,
  61                         struct vlc_playlist_state *state);
  62
  63 void
  64 vlc_playlist_state_NotifyChanges(vlc_playlist_t *playlist,
  65                                  struct vlc_playlist_state *saved_state);
  66
  67 void
  68 vlc_playlist_NotifyMediaUpdated(vlc_playlist_t *playlist, input_item_t *media);
  69
  70 #endif