WIP implement void module with add / remove openings. See #1222.

src/ifcblenderexport/blenderbim/bim/module/root/operator.py

@@ -76,6 +76,7 @@ class AssignClass(bpy.types.Operator):
     ifc_class: bpy.props.StringProperty()
     predefined_type: bpy.props.StringProperty()
     userdefined_type: bpy.props.StringProperty()
+    context_id: bpy.props.IntProperty()
 
     def execute(self, context):
         objects = [bpy.data.objects.get(self.obj)] if self.obj else bpy.context.selected_objects
@@ -107,7 +108,7 @@ class AssignClass(bpy.types.Operator):
         obj.name = "{}/{}".format(product.is_a(), obj.name)
         obj.BIMObjectProperties.ifc_definition_id = int(product.id())
 
-        bpy.ops.bim.add_representation(obj=obj.name)
+        bpy.ops.bim.add_representation(obj=obj.name, context_id=self.context_id)
 
         if product.is_a("IfcElementType"):
             self.place_in_types_collection(obj)
@@ -160,12 +161,12 @@ class AssignClass(bpy.types.Operator):
 class UnassignClass(bpy.types.Operator):
     bl_idname = "bim.unassign_class"
     bl_label = "Unassign IFC Class"
-    object_name: bpy.props.StringProperty()
+    obj: bpy.props.StringProperty()
 
     def execute(self, context):
         self.file = IfcStore.get_file()
-        if self.object_name:
-            objects = [bpy.data.objects.get(self.object_name)]
+        if self.obj:
+            objects = [bpy.data.objects.get(self.obj)]
         else:
             objects = bpy.context.selected_objects
         for obj in objects:

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

@@ -3,6 +3,7 @@ from bpy.types import Panel
 from blenderbim.bim.module.root.data import Data
 from blenderbim.bim.ifc import IfcStore
 
+
 class BIM_PT_class(Panel):
     bl_label = "IFC Class"
     bl_idname = "BIM_PT_class"
@@ -34,8 +35,7 @@ class BIM_PT_class(Panel):
                 row = self.layout.row(align=True)
                 row.label(text=name)
                 row.operator("bim.enable_reassign_class", icon="GREASEPENCIL", text="")
-                op = row.operator("bim.unassign_class", icon="X", text="")
-                op.object_name = context.active_object.name
+                row.operator("bim.unassign_class", icon="X", text="").obj = context.active_object.name
         else:
             self.draw_class_dropdowns()
             row = self.layout.row(align=True)