bim.perform_quantity_take_off - support fallback calculator in ifc4x3 too

src/bonsai/bonsai/bim/module/qto/operator.py

@@ -191,7 +191,7 @@ class PerformQuantityTakeOff(bpy.types.Operator, tool.Ifc.Operator):
 
         not_quantified_elements = run_quantification(props.qto_rule, elements)
         if props.fallback and not_quantified_elements:
-            alternative_rules = next(rule for rule in ifc5d.qto.rules if rule != props.qto_rule)
+            alternative_rules = next(rule for rule in tool.Qto.get_qto_rules() if rule != props.qto_rule)
             not_quantified_elements = run_quantification(alternative_rules, not_quantified_elements)
 
         not_quantified_message = tool.Qto.get_not_quantified_elements_message(not_quantified_elements)

src/bonsai/bonsai/bim/module/qto/prop.py

@@ -38,12 +38,8 @@ CALCULATOR_FUNCTION_ENUM_ITEMS: list[Union[tuple[str, str, str], None]] = []
 
 
 def get_qto_rule(self: "BIMQtoProperties", context: bpy.types.Context) -> list[tuple[str, str, str]]:
-    ifc_file = tool.Ifc.get()
-    is_ifc4x3 = ifc_file.schema == "IFC4X3"
     results: list[tuple[str, str, str]] = []
-    for rule_id, rule in ifc5d.qto.rules.items():
-        if rule_id.startswith("IFC4X3") != is_ifc4x3:
-            continue
+    for rule_id, rule in tool.Qto.get_qto_rules().items():
         results.append((rule_id, rule["name"], rule["description"]))
     return results
 

src/bonsai/bonsai/tool/qto.py

@@ -25,7 +25,7 @@ import ifcopenshell
 import ifcopenshell.util.unit
 import ifcopenshell.util.element
 from mathutils import Vector
-from typing import Optional, Union, Literal, TYPE_CHECKING
+from typing import Optional, Union, Literal, TYPE_CHECKING, Any
 
 if TYPE_CHECKING:
     from bonsai.bim.module.qto.prop import BIMQtoProperties
@@ -168,6 +168,14 @@ class Qto(bonsai.core.tool.Qto):
                         )
         return result
 
+    @classmethod
+    def get_qto_rules(cls) -> dict[str, dict[str, Any]]:
+        import ifc5d.qto
+
+        ifc_file = tool.Ifc.get()
+        is_ifc4x3 = ifc_file.schema == "IFC4X3"
+        return {rule_id: rule for rule_id, rule in ifc5d.qto.rules.items() if rule_id.startswith("IFC4X3") == is_ifc4x3}
+
     @classmethod
     def get_not_quantified_elements_message(cls, not_quantified_elements: set[ifcopenshell.entity_instance]) -> str:
         not_quantified_message = ""