469 lines
15 KiB
Python
469 lines
15 KiB
Python
from __future__ import absolute_import, unicode_literals
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import collections
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import logging
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import random
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from mopidy.core import listener
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from mopidy.models import TlTrack
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logger = logging.getLogger(__name__)
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class TracklistController(object):
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pykka_traversable = True
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def __init__(self, core):
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self.core = core
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self._next_tlid = 0
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self._tl_tracks = []
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self._version = 0
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self._shuffled = []
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# Properties
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def get_tl_tracks(self):
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return self._tl_tracks[:]
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tl_tracks = property(get_tl_tracks)
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"""
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List of :class:`mopidy.models.TlTrack`.
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Read-only.
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"""
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def get_tracks(self):
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return [tl_track.track for tl_track in self._tl_tracks]
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tracks = property(get_tracks)
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"""
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List of :class:`mopidy.models.Track` in the tracklist.
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Read-only.
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"""
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def get_length(self):
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return len(self._tl_tracks)
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length = property(get_length)
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"""Length of the tracklist."""
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def get_version(self):
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return self._version
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def _increase_version(self):
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self._version += 1
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self.core.playback.on_tracklist_change()
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self._trigger_tracklist_changed()
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version = property(get_version)
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"""
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The tracklist version.
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Read-only. Integer which is increased every time the tracklist is changed.
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Is not reset before Mopidy is restarted.
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"""
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def get_consume(self):
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return getattr(self, '_consume', False)
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def set_consume(self, value):
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if self.get_consume() != value:
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self._trigger_options_changed()
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return setattr(self, '_consume', value)
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consume = property(get_consume, set_consume)
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"""
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:class:`True`
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Tracks are removed from the tracklist when they have been played.
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:class:`False`
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Tracks are not removed from the tracklist.
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"""
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def get_random(self):
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return getattr(self, '_random', False)
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def set_random(self, value):
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if self.get_random() != value:
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self._trigger_options_changed()
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if value:
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self._shuffled = self.tl_tracks
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random.shuffle(self._shuffled)
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return setattr(self, '_random', value)
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random = property(get_random, set_random)
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"""
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:class:`True`
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Tracks are selected at random from the tracklist.
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:class:`False`
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Tracks are played in the order of the tracklist.
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"""
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def get_repeat(self):
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return getattr(self, '_repeat', False)
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def set_repeat(self, value):
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if self.get_repeat() != value:
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self._trigger_options_changed()
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return setattr(self, '_repeat', value)
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repeat = property(get_repeat, set_repeat)
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"""
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:class:`True`
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The tracklist is played repeatedly. To repeat a single track, select
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both :attr:`repeat` and :attr:`single`.
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:class:`False`
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The tracklist is played once.
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"""
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def get_single(self):
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return getattr(self, '_single', False)
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def set_single(self, value):
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if self.get_single() != value:
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self._trigger_options_changed()
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return setattr(self, '_single', value)
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single = property(get_single, set_single)
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"""
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:class:`True`
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Playback is stopped after current song, unless in :attr:`repeat`
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mode.
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:class:`False`
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Playback continues after current song.
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"""
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# Methods
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def index(self, tl_track):
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"""
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The position of the given track in the tracklist.
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:param tl_track: the track to find the index of
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:type tl_track: :class:`mopidy.models.TlTrack`
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:rtype: :class:`int` or :class:`None`
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"""
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try:
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return self._tl_tracks.index(tl_track)
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except ValueError:
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return None
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def eot_track(self, tl_track):
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"""
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The track that will be played after the given track.
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Not necessarily the same track as :meth:`next_track`.
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:param tl_track: the reference track
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:type tl_track: :class:`mopidy.models.TlTrack` or :class:`None`
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:rtype: :class:`mopidy.models.TlTrack` or :class:`None`
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"""
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if self.single and self.repeat:
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return tl_track
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elif self.single:
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return None
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# Current difference between next and EOT handling is that EOT needs to
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# handle "single", with that out of the way the rest of the logic is
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# shared.
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return self.next_track(tl_track)
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def next_track(self, tl_track):
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"""
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The track that will be played if calling
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:meth:`mopidy.core.PlaybackController.next()`.
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For normal playback this is the next track in the tracklist. If repeat
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is enabled the next track can loop around the tracklist. When random is
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enabled this should be a random track, all tracks should be played once
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before the tracklist repeats.
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:param tl_track: the reference track
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:type tl_track: :class:`mopidy.models.TlTrack` or :class:`None`
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:rtype: :class:`mopidy.models.TlTrack` or :class:`None`
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"""
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if not self.tl_tracks:
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return None
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if self.random and not self._shuffled:
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if self.repeat or not tl_track:
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logger.debug('Shuffling tracks')
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self._shuffled = self.tl_tracks
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random.shuffle(self._shuffled)
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if self.random:
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try:
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return self._shuffled[0]
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except IndexError:
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return None
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if tl_track is None:
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return self.tl_tracks[0]
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next_index = self.index(tl_track) + 1
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if self.repeat:
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next_index %= len(self.tl_tracks)
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try:
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return self.tl_tracks[next_index]
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except IndexError:
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return None
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def previous_track(self, tl_track):
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"""
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Returns the track that will be played if calling
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:meth:`mopidy.core.PlaybackController.previous()`.
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For normal playback this is the previous track in the tracklist. If
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random and/or consume is enabled it should return the current track
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instead.
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:param tl_track: the reference track
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:type tl_track: :class:`mopidy.models.TlTrack` or :class:`None`
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:rtype: :class:`mopidy.models.TlTrack` or :class:`None`
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"""
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if self.repeat or self.consume or self.random:
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return tl_track
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position = self.index(tl_track)
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if position in (None, 0):
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return None
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return self.tl_tracks[position - 1]
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def add(self, tracks=None, at_position=None, uri=None):
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"""
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Add the track or list of tracks to the tracklist.
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If ``uri`` is given instead of ``tracks``, the URI is looked up in the
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library and the resulting tracks are added to the tracklist.
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If ``at_position`` is given, the tracks placed at the given position in
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the tracklist. If ``at_position`` is not given, the tracks are appended
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to the end of the tracklist.
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Triggers the :meth:`mopidy.core.CoreListener.tracklist_changed` event.
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:param tracks: tracks to add
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:type tracks: list of :class:`mopidy.models.Track`
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:param at_position: position in tracklist to add track
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:type at_position: int or :class:`None`
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:param uri: URI for tracks to add
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:type uri: string
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:rtype: list of :class:`mopidy.models.TlTrack`
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"""
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assert tracks is not None or uri is not None, \
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'tracks or uri must be provided'
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if tracks is None and uri is not None:
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tracks = self.core.library.lookup(uri)
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tl_tracks = []
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for track in tracks:
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tl_track = TlTrack(self._next_tlid, track)
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self._next_tlid += 1
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if at_position is not None:
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self._tl_tracks.insert(at_position, tl_track)
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at_position += 1
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else:
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self._tl_tracks.append(tl_track)
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tl_tracks.append(tl_track)
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if tl_tracks:
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self._increase_version()
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return tl_tracks
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def clear(self):
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"""
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Clear the tracklist.
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Triggers the :meth:`mopidy.core.CoreListener.tracklist_changed` event.
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"""
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self._tl_tracks = []
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self._increase_version()
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def filter(self, criteria=None, **kwargs):
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"""
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Filter the tracklist by the given criterias.
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A criteria consists of a model field to check and a list of values to
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compare it against. If the model field matches one of the values, it
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may be returned.
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Only tracks that matches all the given criterias are returned.
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Examples::
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# Returns tracks with TLIDs 1, 2, 3, or 4 (tracklist ID)
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filter({'tlid': [1, 2, 3, 4]})
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filter(tlid=[1, 2, 3, 4])
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# Returns track with IDs 1, 5, or 7
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filter({'id': [1, 5, 7]})
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filter(id=[1, 5, 7])
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# Returns track with URIs 'xyz' or 'abc'
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filter({'uri': ['xyz', 'abc']})
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filter(uri=['xyz', 'abc'])
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# Returns tracks with ID 1 and URI 'xyz'
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filter({'id': [1], 'uri': ['xyz']})
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filter(id=[1], uri=['xyz'])
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# Returns track with a matching ID (1, 3 or 6) and a matching URI
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# ('xyz' or 'abc')
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filter({'id': [1, 3, 6], 'uri': ['xyz', 'abc']})
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filter(id=[1, 3, 6], uri=['xyz', 'abc'])
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:param criteria: on or more criteria to match by
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:type criteria: dict, of (string, list) pairs
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:rtype: list of :class:`mopidy.models.TlTrack`
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"""
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criteria = criteria or kwargs
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matches = self._tl_tracks
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for (key, values) in criteria.iteritems():
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if (not isinstance(values, collections.Iterable)
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or isinstance(values, basestring)):
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# Fail hard if anyone is using the <0.17 calling style
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raise ValueError('Filter values must be iterable: %r' % values)
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if key == 'tlid':
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matches = filter(lambda ct: ct.tlid in values, matches)
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else:
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matches = filter(
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lambda ct: getattr(ct.track, key) in values, matches)
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return matches
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def move(self, start, end, to_position):
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"""
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Move the tracks in the slice ``[start:end]`` to ``to_position``.
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Triggers the :meth:`mopidy.core.CoreListener.tracklist_changed` event.
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:param start: position of first track to move
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:type start: int
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:param end: position after last track to move
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:type end: int
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:param to_position: new position for the tracks
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:type to_position: int
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"""
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if start == end:
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end += 1
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tl_tracks = self._tl_tracks
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assert start < end, 'start must be smaller than end'
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assert start >= 0, 'start must be at least zero'
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assert end <= len(tl_tracks), \
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'end can not be larger than tracklist length'
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assert to_position >= 0, 'to_position must be at least zero'
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assert to_position <= len(tl_tracks), \
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'to_position can not be larger than tracklist length'
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new_tl_tracks = tl_tracks[:start] + tl_tracks[end:]
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for tl_track in tl_tracks[start:end]:
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new_tl_tracks.insert(to_position, tl_track)
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to_position += 1
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self._tl_tracks = new_tl_tracks
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self._increase_version()
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def remove(self, criteria=None, **kwargs):
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"""
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Remove the matching tracks from the tracklist.
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Uses :meth:`filter()` to lookup the tracks to remove.
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Triggers the :meth:`mopidy.core.CoreListener.tracklist_changed` event.
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:param criteria: on or more criteria to match by
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:type criteria: dict
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:rtype: list of :class:`mopidy.models.TlTrack` that was removed
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"""
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tl_tracks = self.filter(criteria, **kwargs)
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for tl_track in tl_tracks:
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position = self._tl_tracks.index(tl_track)
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del self._tl_tracks[position]
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self._increase_version()
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return tl_tracks
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def shuffle(self, start=None, end=None):
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"""
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Shuffles the entire tracklist. If ``start`` and ``end`` is given only
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shuffles the slice ``[start:end]``.
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Triggers the :meth:`mopidy.core.CoreListener.tracklist_changed` event.
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:param start: position of first track to shuffle
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:type start: int or :class:`None`
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:param end: position after last track to shuffle
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:type end: int or :class:`None`
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"""
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tl_tracks = self._tl_tracks
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if start is not None and end is not None:
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assert start < end, 'start must be smaller than end'
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if start is not None:
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assert start >= 0, 'start must be at least zero'
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if end is not None:
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assert end <= len(tl_tracks), 'end can not be larger than ' + \
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'tracklist length'
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before = tl_tracks[:start or 0]
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shuffled = tl_tracks[start:end]
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after = tl_tracks[end or len(tl_tracks):]
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random.shuffle(shuffled)
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self._tl_tracks = before + shuffled + after
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self._increase_version()
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def slice(self, start, end):
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"""
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Returns a slice of the tracklist, limited by the given start and end
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positions.
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:param start: position of first track to include in slice
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:type start: int
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:param end: position after last track to include in slice
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:type end: int
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:rtype: :class:`mopidy.models.TlTrack`
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"""
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return self._tl_tracks[start:end]
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def mark_playing(self, tl_track):
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"""Private method used by :class:`mopidy.core.PlaybackController`."""
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if self.random and tl_track in self._shuffled:
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self._shuffled.remove(tl_track)
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def mark_unplayable(self, tl_track):
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"""Private method used by :class:`mopidy.core.PlaybackController`."""
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logger.warning('Track is not playable: %s', tl_track.track.uri)
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if self.random and tl_track in self._shuffled:
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self._shuffled.remove(tl_track)
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def mark_played(self, tl_track):
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"""Private method used by :class:`mopidy.core.PlaybackController`."""
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if not self.consume:
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return False
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self.remove(tlid=[tl_track.tlid])
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return True
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def _trigger_tracklist_changed(self):
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if self.random:
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self._shuffled = self.tl_tracks
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random.shuffle(self._shuffled)
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else:
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self._shuffled = []
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logger.debug('Triggering event: tracklist_changed()')
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listener.CoreListener.send('tracklist_changed')
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def _trigger_options_changed(self):
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logger.debug('Triggering options changed event')
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listener.CoreListener.send('options_changed')
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