84 lines
2.6 KiB
C
84 lines
2.6 KiB
C
/*
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* Copyright 2016 (c) Anna Schumaker.
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*
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* NOTE: The playlist_iter type is defined in include/core/playlists/playlist.h
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*/
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#ifndef OCARINA_CORE_PLAYLISTS_ITERATOR_H
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#define OCARINA_CORE_PLAYLISTS_ITERATOR_H
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#include <core/playlists/playlist.h>
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/* Called to set the playlist iterator to a specific position. */
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static inline playlist_iter playlist_iter_get(struct playlist *playlist,
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unsigned int n)
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{
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return playlist ? g_queue_peek_nth_link(&playlist->pl_tracks, n) : NULL;
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}
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/* Called to advance the requested playlist iterator. */
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static inline playlist_iter playlist_iter_next(playlist_iter iter)
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{
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return g_list_next(iter);
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}
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/* Called to get a pointer to the track at the requested iterator. */
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static inline struct track *playlist_iter_track(playlist_iter iter)
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{
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return iter ? iter->data : NULL;
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}
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/* Called to find the playlist index of the requested iterator. */
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static inline int playlist_iter_index(struct playlist *playlist,
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playlist_iter iter)
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{
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return (playlist && iter) ? g_queue_link_index(&playlist->pl_tracks, iter) : -1;
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}
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/* Called to iterate over the entire playlist. */
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#define playlist_for_each(playlist, it) \
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for (it = playlist_iter_get(playlist, 0); it; it = playlist_iter_next(it))
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/* Called to set the index of the current track. */
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static inline bool playlist_current_set(struct playlist *playlist,
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unsigned int n)
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{
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if (playlist)
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playlist->pl_current = playlist_iter_get(playlist, n);
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return playlist && playlist->pl_current;
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}
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/* Called to advance the current track. */
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static inline bool playlist_current_next(struct playlist *playlist)
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{
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if (playlist)
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playlist->pl_current = playlist_iter_next(playlist->pl_current);
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return playlist && playlist->pl_current;
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}
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/* Called to rewind the current track. */
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static inline bool playlist_current_previous(struct playlist *playlist)
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{
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if (playlist)
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playlist->pl_current = g_list_previous(playlist->pl_current);
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return playlist && playlist->pl_current;
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}
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/* Called to get a pointer to the current track. */
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static inline struct track *playlist_current_track(struct playlist *playlist)
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{
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return playlist ? playlist_iter_track(playlist->pl_current) : NULL;
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}
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/* Called to get the playlist index of the current track. */
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static inline int playlist_current_index(struct playlist *playlist)
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{
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return playlist ? playlist_iter_index(playlist, playlist->pl_current) : -1;
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}
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/* Called to find the nth track on a playlist. */
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static inline struct track *playlist_at(struct playlist *playlist, unsigned int n)
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{
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return playlist_iter_track(playlist_iter_get(playlist, n));
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}
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#endif /* OCARINA_CORE_PLAYLISTS_ITERATOR_H */
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