New in version 1.1.1.
When component is voice, staff or other sequential context, and when component contains a measure, return first measure in component. This starts the process of forwards measure iteration.
abjad> staff = Staff(RigidMeasure((2, 8), construct.run(2)) * 2)
abjad> pitchtools.diatonicize(staff)
abjad> iterate.measure_next(staff)
RigidMeasure(2/8, [c'8, d'8])
When component is voice, staff or other sequential context, and when component contains no measure, raise MissingMeasureError.
abjad> staff = Staff(construct.scale(4))
abjad> iterate.measure_next(staff)
MissingMeasureError
When component is a measure and there is a measure immediately following component, return measure immediately following component.
abjad> staff = Staff(RigidMeasure((2, 8), construct.run(2)) * 2)
abjad> pitchtools.diatonicize(staff)
abjad> iterate.measure_prev(staff[0])
RigidMeasure(2/8, [e'8, f'8])
When component is a measure and there is no measure immediately following component, return None.
abjad> staff = Staff(RigidMeasure((2, 8), construct.run(2)) * 2)
abjad> pitchtools.diatonicize(staff)
abjad> iterate.measure_prev(staff[-1])
(None)
When component is a leaf and there is a measure in the parentage of component, return the measure in the parentage of component.
abjad> staff = Staff(RigidMeasure((2, 8), construct.run(2)) * 2)
abjad> pitchtools.diatonicize(staff)
abjad> iterate.measure_prev(staff.leaves[0])
RigidMeasure(2/8, [c'8, d'8])
When component is a leaf and there is no measure in the parentage of component, raise MissingMeasureError.
abjad> staff = Staff(construct.scale(4))
abjad> iterate.measure_prev(staff.leaves[0])
MissingMeasureError