typing

src/bonsai/bonsai/bim/export_ifc.py

@@ -139,6 +139,10 @@ class IfcExporter:
 
 
 class IfcExportSettings:
+    """
+    Initialize only using `IfcExportSettings.factory()`.
+    """
+
     def __init__(self):
         self.logger: Logger = None
         self.output_file: str = None

src/bonsai/bonsai/bim/import_ifc.py

@@ -1177,8 +1177,12 @@ class IfcImporter:
 
 
 class IfcImportSettings:
+    """
+    Initialize only using `IfcImportSettings.factory()`.
+    """
+
     input_file: Union[str, None] = None
-    logger: Union[logging.Logger, None] = None
+    logger: logging.Logger
 
     def __init__(self):
         self.diff_file = None

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

@@ -405,9 +405,13 @@ class BIMProjectProperties(PropertyGroup):
     queried_obj: bpy.props.PointerProperty(type=bpy.types.Object)
     queried_obj_root: bpy.props.PointerProperty(type=bpy.types.Object)
     clipping_planes: bpy.props.CollectionProperty(type=ObjProperty)
-    clipping_planes_active: bpy.props.IntProperty(min=0, default=0, max=5)
+    clipping_planes_active_index: bpy.props.IntProperty(min=0, default=0, max=5)
     edited_objs: bpy.props.CollectionProperty(type=EditedObj)
 
+    @property
+    def active_clipping_plane(self) -> ObjProperty | None:
+        return tool.Blender.get_active_uilist_element(self.clipping_planes, self.clipping_planes_active_index)
+
     @property
     def clipping_planes_objs(self) -> list[bpy.types.Object]:
         return list({cp.obj for cp in self.clipping_planes if cp.obj})
@@ -486,7 +490,7 @@ class BIMProjectProperties(PropertyGroup):
         queried_obj: Union[bpy.types.Object, None]
         queried_obj_root: Union[bpy.types.Object, None]
         clipping_planes: bpy.types.bpy_prop_collection_idprop[ObjProperty]
-        clipping_planes_active: int
+        clipping_planes_active_index: int
         edited_objs: bpy.types.bpy_prop_collection_idprop[EditedObj]
 
     def get_active_library_breadcrumb(self) -> Union[LibraryBreadcrumb, None]:

src/bonsai/bonsai/bim/ui.py

@@ -40,6 +40,11 @@ from typing import Optional, TYPE_CHECKING, Literal
 from natsort import natsorted
 
 
+if TYPE_CHECKING:
+    from bonsai.bim.prop import ObjProperty
+    from bonsai.bim.module.project.prop import BIMProjectProperties
+
+
 class IFCFileSelector:
     layout: bpy.types.UILayout
 
@@ -171,17 +176,26 @@ class BIM_PT_section_with_cappings(Panel):
             props,
             "clipping_planes",
             props,
-            "clipping_planes_active",
+            "clipping_planes_active_index",
         )
 
-        if props.clipping_planes_active < len(props.clipping_planes):
-            active_clipping_plane_obj = props.clipping_planes[props.clipping_planes_active].obj
+        if active_clipping_plane := props.active_clipping_plane:
+            active_clipping_plane_obj = active_clipping_plane.obj
             box.prop(active_clipping_plane_obj, "location")
             box.prop(active_clipping_plane_obj, "rotation_euler")
 
 
 class BIM_UL_clipping_plane(bpy.types.UIList):
-    def draw_item(self, context, layout, data, item, icon, active_data, active_propname):
+    def draw_item(
+        self,
+        context,
+        layout: bpy.types.UILayout,
+        data: "BIMProjectProperties",
+        item: "ObjProperty",
+        icon,
+        active_data,
+        active_propname,
+    ) -> None:
         if item and item.obj:
             obj = item.obj
             row = layout.row(align=True)
@@ -199,7 +213,7 @@ class BIM_UL_generic(bpy.types.UIList):
         self,
         context,
         layout: bpy.types.UILayout,
-        data,
+        data: bpy.types.PropertyGroup,
         item: bpy.types.PropertyGroup,
         icon,
         active_data,