def set_clef(self, clef):
"""Sets the clef, and resets the key signature if necessary."""
if clef != self.clef:
self._key_signature_state = _KeySignatureState.KEY_SIGNATURE
self.key_signature = key_signature_module.KeySignature(clef)
self._accidentals = key_signature_module.Accidentals(clef)
self.clef = clef
def __init__(self, start_time, clef, key_signature=None):
"""Initializes a new measure.
Args:
start_time: The start time (in quarter notes) of the measure.
clef: A `Clef`.
key_signature: The previously detected key signature (optional). If
present, do not detect a key signature in this measure. This should be
taken from the previously measure on this staff if this is not the
first measure. It should not be propagated from one staff to the next,
because we expect the key signature to be repeated on each staff and
we will re-detect it.
"""
self.time = start_time
self.clef = clef
self.key_signature = (key_signature
or key_signature_module.KeySignature(clef))
self._accidentals = key_signature_module.Accidentals(clef)
self._key_signature_state = (_KeySignatureState.ACCIDENTALS
if key_signature else
_KeySignatureState.KEY_SIGNATURE)
self.chords = {}