Fix #4049. New basic "regenerate occurrence name" operator.

src/blenderbim/blenderbim/bim/handler.py

@@ -59,6 +59,10 @@ def name_callback(obj, data):
     if not obj.BIMObjectProperties.ifc_definition_id:
         return
 
+    if obj.BIMObjectProperties.is_renaming:
+        obj.BIMObjectProperties.is_renaming = False
+        return
+
     element = IfcStore.get_file().by_id(obj.BIMObjectProperties.ifc_definition_id)
     if "/" in obj.name:
         object_name = obj.name

src/blenderbim/blenderbim/bim/module/type/__init__.py

@@ -22,6 +22,7 @@ from . import ui, prop, operator
 classes = (
     operator.AddType,
     operator.AssignType,
+    operator.AutoRenameOccurrences,
     operator.DisableEditingType,
     operator.DuplicateType,
     operator.EnableEditingType,

src/blenderbim/blenderbim/bim/module/type/operator.py

@@ -498,6 +498,22 @@ class RenameType(bpy.types.Operator, tool.Ifc.Operator):
         self.layout.prop(self, "name")
 
 
+class AutoRenameOccurrences(bpy.types.Operator, tool.Ifc.Operator):
+    bl_idname = "bim.auto_rename_occurrences"
+    bl_label = "Auto Rename Occurrences"
+    bl_options = {"REGISTER", "UNDO"}
+
+    def _execute(self, context):
+        obj = context.active_object
+        element_type = tool.Ifc.get_entity(obj)
+        if element_type and element_type.is_a("IfcTypeObject"):
+            for occurrence in ifcopenshell.util.element.get_types(element_type):
+                obj = tool.Ifc.get_object(occurrence)
+                occurrence.Name = tool.Model.generate_occurrence_name(element_type, occurrence.is_a())
+                if obj:
+                    tool.Root.set_object_name(obj, occurrence)
+
+
 class DuplicateType(bpy.types.Operator, tool.Ifc.Operator):
     bl_idname = "bim.duplicate_type"
     bl_label = "Duplicate Type"

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

@@ -64,6 +64,7 @@ class BIM_PT_type(Panel):
         select_type_objects_row.enabled = int(TypeData.data["total_instances"]) > 0
         op = row.operator("bim.duplicate_type", icon="DUPLICATE", text="")
         op.element = context.active_object.BIMObjectProperties.ifc_definition_id
+        row.operator("bim.auto_rename_occurrences", icon="ITALIC", text="")
 
     def draw_product_ui(self, context):
         layout = self.layout

src/blenderbim/blenderbim/bim/prop.py

@@ -425,6 +425,7 @@ class BIMObjectProperties(PropertyGroup):
         default="NONE",
     )
     is_reassigning_class: BoolProperty(name="Is Reassigning Class")
+    is_renaming: BoolProperty(name="Is Renaming", default=False)
     location_checksum: StringProperty(name="Location Checksum")
     rotation_checksum: StringProperty(name="Rotation Checksum")
 

src/blenderbim/blenderbim/tool/root.py

@@ -214,5 +214,7 @@ class Root(blenderbim.core.tool.Root):
 
     @classmethod
     def set_object_name(cls, obj, element):
+        # This disables the Blender name event handler
+        obj.BIMObjectProperties.is_renaming = True
         name = getattr(element, "Name", getattr(element, "AxisTag", None))
         obj.name = "{}/{}".format(element.is_a(), name or "Unnamed")