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from collections import namedtuple
_AB = namedtuple("_AB", ["a", "b"])
class ABController:
def __init__(self, enabled=True, callback=None):
self._setPositionCallback = callback
self._limits = {} # dictionary of all songs
self._songLimits = None # list of limits for selected song
self._currentLimits = _AB(0.0, 0.0) # a/b positions of active limit
self._loadedIndex = None
self._enabled = enabled
def _ensureSongExists(self, path):
if path not in self._limits:
self._limits[path] = []
def setCurrentSong(self, path):
self._ensureSongExists(path)
self._songLimits = self._limits[path]
self._loadedIndex = None
def storeLimits(self, aLimit, bLimit, song=None):
if song is not None:
self._ensureSongExists(song)
songLimits = self._limits[song]
else:
songLimits = self._songLimits
if songLimits is None:
return
ab = _AB(aLimit, bLimit)
songLimits.append(ab)
def loadLimits(self, index):
if not self._songLimits:
return
if index >= 0 and index < len(self._songLimits):
self._currentLimits = self._songLimits[index]
self._loadedIndex = index
def nextStoredAbLimits(self):
if self._loadedIndex is None:
nextIndex = 0
else:
nextIndex = self._loadedIndex + 1
self.loadLimits(nextIndex)
def previousStoredAbLimits(self):
if self._loadedIndex is None:
previousIndex = 0
else:
previousIndex = self._loadedIndex - 1
self.loadLimits(previousIndex)
def setLimits(self, aLimit, bLimit):
self._currentLimits = _AB(aLimit, bLimit)
self._loadedIndex = None
def positionChanged(self, position):
if position > self._currentLimits.b and self._setPositionCallback and self._enabled:
self._setPositionCallback(self._currentLimits.a)
def setEnable(self, enable):
self._enabled = enable
def getStoredLimits(self, song):
return self._limits.get(song)
def getCurrentLimits(self):
return self._currentLimits
def getLoadedIndex(self):
return self._loadedIndex
def clear(self):
self.__init__(enabled=self._enabled, callback=self._setPositionCallback)
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