Delegate formatter `.index_field` to the parent `Viz`
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@ -54,7 +54,16 @@ class IncrementalFormatter(msgspec.Struct):
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'''
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shm: ShmArray
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viz: Viz
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index_field: str = 'index'
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@property
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def index_field(self) -> 'str':
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'''
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Value (``str``) used to look up the "index series" from the
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underlying source ``numpy`` struct-array; delegate directly to
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the managing ``Viz``.
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'''
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return self.viz.index_field
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# Incrementally updated xy ndarray formatted data, a pre-1d
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# format which is updated and cached independently of the final
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