aee4764a2c
This function is similar to queue_remove(), except the remove can be prevented if qop_erase() returns false. Signed-off-by: Anna Schumaker <Anna@OcarinaProject.net>
135 lines
4.4 KiB
C
135 lines
4.4 KiB
C
/*
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* Copyright 2013 (c) Anna Schumaker.
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*
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* Queues are lists of tracks that the user has requested to play next.
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* Users of queues are expected to implement their own save and load functions,
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* and to provide a filled out queue_ops structure during initialization.
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*/
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#ifndef OCARINA_CORE_QUEUE_H
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#define OCARINA_CORE_QUEUE_H
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#include <core/containers/queue.h>
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#include <core/file.h>
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#include <core/tags/track.h>
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struct queue;
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enum queue_flags {
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Q_ENABLED = (1 << 0), /* Queue is enabled. */
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Q_RANDOM = (1 << 1), /* Queue will pick songs randomly. */
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Q_REPEAT = (1 << 2), /* Queue will not remove songs when picked. */
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Q_NO_SORT = (1 << 3), /* Queue will not be sorted. */
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Q_SAVE_FLAGS = (1 << 4), /* Queue will be saved when flags change. */
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Q_SAVE_SORT = (1 << 5), /* Queue will be saved when sorted. */
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Q_ADD_FRONT = (1 << 6), /* Queue will add new tracks at the front. */
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};
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struct queue_ops {
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/* Called to tell a higher layer that a queue has been initialized. */
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void *(*qop_init)(struct queue *);
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/* Called to tell a higher layer that a queue is deinitializing. */
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void (*qop_deinit)(struct queue *);
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/* Called to tell a higher layer that a track has been added. */
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void (*qop_added)(struct queue *, unsigned int);
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/* Called to ask a higher layer if a track can be erased. */
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bool (*qop_erase)(struct queue *, struct track *);
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/* Called to tell a higher layer that a track has been removed. */
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void (*qop_removed)(struct queue *, unsigned int);
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/* Called to tell a higher layer that the queue has been cleared. */
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void (*qop_cleared)(struct queue *, unsigned int);
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/* Called to have a higher layer save the queue. */
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void (*qop_save)(struct queue *, enum queue_flags);
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/* Called to tell a higher layer that a track has been updated. */
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void (*qop_updated)(struct queue *, unsigned int);
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};
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struct queue {
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unsigned int q_flags; /* The queue's set of flags. */
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unsigned int q_length; /* The queue's total runtime (in seconds). */
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struct _queue q_tracks; /* The queue's list of tracks. */
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struct _q_iter q_cur; /* The queue's last-played position. */
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GSList *q_sort; /* The queue's sort order. */
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void *q_private; /* The queue's private data. */
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const struct queue_ops *q_ops; /* The queue's operations vector. */
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};
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/* Called to initialize a queue. */
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void queue_init(struct queue *, unsigned int, const struct queue_ops *);
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/* Called to deinitialize a queue. */
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void queue_deinit(struct queue *);
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/* Called to set a queue flag. */
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void queue_set_flag(struct queue *, enum queue_flags);
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/* Called to clear a queue flag. */
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void queue_unset_flag(struct queue *, enum queue_flags);
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/* Called to check if the queue has a specific flag set. */
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static inline bool queue_has_flag(struct queue *queue, enum queue_flags flag)
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{
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return (queue->q_flags & flag) == (unsigned int)flag;
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}
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/* Called to find the size of the queue. */
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static inline unsigned int queue_size(struct queue *queue)
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{
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return _q_size(&queue->q_tracks);
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}
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/* Called to access the queued track at a given index. */
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static inline struct track *queue_at(struct queue *queue, unsigned int index)
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{
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return (struct track *)g_queue_peek_nth(&queue->q_tracks._queue, index);
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}
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/* Called to add a track to the queue. */
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unsigned int queue_add(struct queue *, struct track *);
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/*
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* Called to erase a track from the queue by index.
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* This can be prevented if qop_erase() returns "false".
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*/
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void queue_erase(struct queue *, unsigned int);
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/* Called to remove a track from the queue by index. */
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void queue_remove(struct queue *, unsigned int);
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/* Called to remove all instances of the track from the queue. */
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void queue_remove_all(struct queue *, struct track *);
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/* Called to remove all tracks from the queue. */
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void queue_clear(struct queue *);
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/* Called to tell the queue that a track has been updated. */
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void queue_updated(struct queue *, struct track *);
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/* Called to tell the queue that a specific index has been selected. */
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struct track *queue_selected(struct queue *, unsigned int);
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/* Called to pick the next track from the queue. */
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struct track *queue_next(struct queue *);
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/* Called to sort the queue without changing sort order. */
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void queue_resort(struct queue *);
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/* Called to change the sort order and resort the queue. */
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void queue_sort(struct queue *, enum compare_t, bool);
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#endif /* OCARINA_CORE_QUEUE_H */
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