Fix #4484. Clarify inheritance rules of predefined types.

src/blenderbim/blenderbim/bim/module/root/data.py

@@ -42,6 +42,7 @@ class IfcClassData:
         cls.data["contexts"] = cls.contexts()
         cls.data["has_entity"] = cls.has_entity()
         cls.data["name"] = cls.name()
+        cls.data["has_inherited_predefined_type"] = cls.has_inherited_predefined_type()
         cls.data["ifc_class"] = cls.ifc_class()
         cls.data["ifc_predefined_types"] = cls.ifc_predefined_types()
         cls.data["can_reassign_class"] = cls.can_reassign_class()
@@ -162,6 +163,15 @@ class IfcClassData:
             name += f"[{predefined_type}]"
         return name
 
+    @classmethod
+    def has_inherited_predefined_type(cls):
+        element = tool.Ifc.get_entity(bpy.context.view_layer.objects.active)
+        if not element:
+            return
+        if element_type := ifcopenshell.util.element.get_type(element):
+            return ifcopenshell.util.element.get_predefined_type(element_type) != "NOTDEFINED"
+        return False
+
     @classmethod
     def ifc_class(cls):
         element = tool.Ifc.get_entity(bpy.context.view_layer.objects.active)

src/blenderbim/blenderbim/bim/module/root/ui.py

@@ -61,7 +61,10 @@ class BIM_PT_class(Panel):
                 self.layout.prop(context.scene.BIMRootProperties, "relating_class_object", icon="COPYDOWN")
             else:
                 row = self.layout.row(align=True)
-                row.label(text=IfcClassData.data["name"])
+                row.label(
+                    text=IfcClassData.data["name"],
+                    icon="CON_CHILDOF" if IfcClassData.data["has_inherited_predefined_type"] else "NONE",
+                )
                 row.operator("bim.select_ifc_class", text="", icon="RESTRICT_SELECT_OFF")
                 row.operator("bim.unlink_object", icon="UNLINKED", text="")
                 if IfcClassData.data["can_reassign_class"]:

src/ifcopenshell-python/ifcopenshell/util/element.py

@@ -26,10 +26,10 @@ def get_pset(
     element: ifcopenshell.entity_instance,
     name: str,
     prop: Optional[str] = None,
-    psets_only=False,
+    psets_only: bool = False,
-    qtos_only=False,
+    qtos_only: bool = False,
-    should_inherit=True,
+    should_inherit: bool = True,
-    verbose=False,
+    verbose: bool = False,
 ) -> Union[Any, dict[str, Any]]:
     """Retrieve a single property set or single property
 
@@ -429,8 +429,7 @@ def get_predefined_type(element: ifcopenshell.entity_instance) -> str:
         element = ifcopenshell.by_type("IfcWall")[0]
         predefined_type = ifcopenshell.util.element.get_predefined_type(element)
     """
-    element_type = get_type(element)
+    if element_type := get_type(element):
-    if element_type:
         predefined_type = getattr(element_type, "PredefinedType", None)
         if predefined_type == "USERDEFINED" or not predefined_type:
             predefined_type = getattr(element_type, "ElementType", ...)
@@ -563,7 +562,9 @@ def get_material(
             return get_material(relating_type, should_skip_usage)
 
 
-def get_materials(element: ifcopenshell.entity_instance, should_inherit=True) -> list[ifcopenshell.entity_instance]:
+def get_materials(
+    element: ifcopenshell.entity_instance, should_inherit: bool = True
+) -> list[ifcopenshell.entity_instance]:
     """Gets individual materials of an element
 
     If the element has a material set, the individual materials of that set are
@@ -826,7 +827,7 @@ def get_layers(
 
 
 def get_container(
-    element: ifcopenshell.entity_instance, should_get_direct=False, ifc_class: Optional[str] = None
+    element: ifcopenshell.entity_instance, should_get_direct: bool = False, ifc_class: Optional[str] = None
 ) -> ifcopenshell.entity_instance:
     """
     Retrieves the spatial structure container of an element.

src/ifcopenshell-python/test/util/test_element.py

@@ -291,6 +291,16 @@ class TestGetPredefinedTypeIFC4(test.bootstrap.IFC4):
         element_type.ProcessType = "FOOBAR"
         assert subject.get_predefined_type(element) == "FOOBAR"
 
+    def test_getting_an_element_type_predefined_type(self):
+        element_type = ifcopenshell.api.run("root.create_entity", self.file, ifc_class="IfcWallType")
+        element_type.PredefinedType = "PARTITIONING"
+        assert subject.get_predefined_type(element_type) == "PARTITIONING"
+
+    def test_getting_an_element_type_null_predefined_type(self):
+        element_type = ifcopenshell.api.run("root.create_entity", self.file, ifc_class="IfcWallType")
+        element_type.PredefinedType = "NOTDEFINED"
+        assert subject.get_predefined_type(element_type) == "NOTDEFINED"
+
 
 class TestGetTypeIFC4(test.bootstrap.IFC4):
     def test_getting_the_type_of_a_product(self):