Bonsai's Pset/Qto editor could display a property or quantity's own Unit
override, but had no UI to author one -- only the project-level Project
Units panel existed, which sets defaults, not per-instance overrides.
Builds on the edit_pset/edit_qto Unit-wrapping support and the
get_unit_scale/get_candidate_units helpers added in the previous commit.
- bim/prop.py: Attribute gains unit_id (the STEP id of the property's own
override, 0 = project default) and unit_id_enum (the dropdown-driving
dynamic enum, "Default (<symbol>)" plus every candidate unit for the
attribute's measure type). update_attribute_unit_id converts the stored
value live when a different unit is picked, so the physical quantity is
preserved rather than the number being silently relabeled.
- tool/pset.py: is_measurable_special_type/get_candidate_units_for_special_type/
resolve_effective_unit/convert_attribute_unit support the picker and the
live conversion. get_special_type_for_prop classifies a property by its
value's own declared measure type, falling back to an explicitly-attached
Unit for generic numeric types (e.g. IfcReal) whose spec carries no unit
semantics of its own but which may still legitimately carry one. Seeding
in import_pset_from_existing ignores a stray Unit attached to a property
whose value has no numeric/measure semantics at all (e.g. text), which
used to crash trying to select an identifier the picker's enum items
never include.
- bim/module/pset/ui.py: the picker widget itself, next to the value field
in edit mode, gated on the attribute being measurable.
- bim/module/pset/operator.py: EditPset wraps measurable values with their
chosen Unit on save, for both properties and quantities. The qto
rounding-loop fix reaches into the wrapped dict instead of assuming a
bare float/int, which would otherwise zero out every unit-overridden
quantity.
Adds regression tests across all of the above, including conversion
correctness, explicit-clear/default round-trips, an unrelated sibling
property's override surviving untouched, and the stray-Unit crash guard.
Previously, unit symbols only appeared while a Pset/Qto was in edit mode
(pencil icon) -- the read-only summary view read raw {name: value} dicts
straight from ifcopenshell.util.element.get_psets(), a completely separate
path from the Attribute/unit_symbol machinery, so it never showed a label
even after the earlier fixes. This matters for the "someone in the field
just looking at values" use case, not just editing.
- bim/module/pset/data.py: switch to get_psets(verbose=True) to get each
property's own entity id, then resolve its unit symbol the same
override-aware way the edit-mode path does (tool.Pset.get_unit_symbol_for_prop).
Falls back gracefully (empty symbol) for IfcPreDefinedPropertySet
attributes, which aren't IfcProperty entities and can't carry a Unit
override.
- bim/module/pset/ui.py: read-only value button now shows "250 mm" instead
of just "250".
Also adds the regression tests planned but not yet committed:
- test/tool/test_pset.py: edit a property with its own Unit override and
write it back, confirming no rescale and the override survives.
- test/bim/test_prop.py (new): get_display_name() falls back to the plain
name (no crash) when no unit is resolvable or the project has no units
assigned at all.
Richard Brice