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33 lines
1.6 KiB
33 lines
1.6 KiB
"""
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Grist supports organizing a list of records as a tree view which allows for grouping records as
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children of some other record.
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On the client, the .indentation is used to measure the distance between the left margin of the
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container and where we want the record to be. The variation of .indentation gives the parent-child
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relationship between consecutive records. For instance in ["A0", "B1", "C1"] (where "A0" stands for
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the record {'id': "A", 'indentation': 0}), "B" and "C" are children of "A". In ["A0", "B1", "C2"],
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"C" is a child of "B", which is a child of "A".
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The order for the records is typically handled using a field of type "PositionNumber", ie: .pagePos
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in _grist_Pages table.
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Because user can remove records that invalidate the tree, the module exposes fix_indents. For
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example if user removes "C" from ["A0", "B1", "C0", "D1"] the resulting table holds ["A0", "B1",
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"D1"] and "D" became child of "A", which is unfortunate because we'd rather have "C" become a
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sibling of "A" instead. Using fix_indents helps with keeping the tree consistent by returning [("D",
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0)] which indicate that the indentation of row "D" needs to be set to 0.
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"""
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# Items is an array of items with .id and .indentation properties. Returns a list of (item_id,
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# new_indent) pairs.
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def fix_indents(items, deleted_ids):
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max_next_indent = 0
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adjustments = []
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for item in items:
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indent = min(max_next_indent, item.indentation)
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is_deleted = item.id in deleted_ids
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if indent != item.indentation and not is_deleted:
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adjustments.append((item.id, indent))
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max_next_indent = indent if is_deleted else indent + 1
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return adjustments
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