Bases: abjad.core.observer._Observer, abjad.core.backtracking._BacktrackingInterface, abjad.core.grobhandler._GrobHandler
Report on Abjad staff in parentage of client.
Interface to LilyPond stopStaff, startStaff hiding commands.
Handle no LilyPond grob.
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change
- True when core attribute changes at client, otherwise False.
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effective
- Effective staff of client.
If staff is forced on client, return forced staff.
Otherwise, return explicit staff of client.
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explicit
- First explicit Abjad Staff in parentage of client.
Otherwise None.
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forced
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hide