Purging styles to also purge associated blender materials #3914

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

@@ -648,9 +648,7 @@ class PurgeUnusedObjects(bpy.types.Operator, tool.Ifc.Operator):
         elif object_type == "PROFILE":
             purged = bonsai.core.profile.purge_unused_profiles(tool.Ifc, tool.Profile)
         elif object_type == "STYLE":
-            # It's okay to remove IfcPresentationStyle if just remove_deep
-            # as there are no white listed inverses.
-            purged = tool.Debug.purge_unused_class("IfcPresentationStyle")
+            purged = tool.Style.purge_unused_styles()
         elif object_type == "MATERIAL":
             purged = tool.Material.purge_unused_materials()
         else:

src/bonsai/bonsai/core/style.py

@@ -55,7 +55,15 @@ def update_external_style(
     ifc.run("style.edit_surface_style", style=external_style, attributes=attributes)
 
 
-def remove_style(ifc: tool.Ifc, style_tool: tool.Style, style: ifcopenshell.entity_instance) -> None:
+def remove_style(
+    ifc: tool.Ifc, style_tool: tool.Style, style: ifcopenshell.entity_instance, reload_styles_ui: bool = False
+) -> None:
+    """Remove IfcPresentationStyle and associated Blender material.
+
+    :param reload_styles_ui: Whether to reload Styles UI after removal.
+        Useful to disable if you plan to remove many styles and want to
+        avoid unnecessary reloads.
+    """
     obj = ifc.get_object(style)
     # Get style_type before removing object as later StylesData might fail to load
     # due object not yet removed completely.
@@ -63,7 +71,7 @@ def remove_style(ifc: tool.Ifc, style_tool: tool.Style, style: ifcopenshell.enti
     ifc.unlink(element=style)
     ifc.run("style.remove_style", style=style)
     style_tool.delete_object(obj)
-    if style_tool.is_editing_styles():
+    if reload_styles_ui and style_tool.is_editing_styles():
         style_tool.import_presentation_styles(style_type)
 
 

src/bonsai/bonsai/tool/debug.py

@@ -98,15 +98,3 @@ class Debug(bonsai.core.tool.Debug):
                 print(f"{class_string: <50} {unused[ifc_class]: >5}")
 
         return sum(unused.values())
-
-    @classmethod
-    def purge_unused_class(cls, ifc_class: str) -> int:
-        ifc_file = tool.Ifc.get()
-        elements = ifc_file.by_type(ifc_class)
-        i = 0
-        for element in elements:
-            if ifc_file.get_total_inverses(element) != 0:
-                continue
-            ifcopenshell.util.element.remove_deep(ifc_file, element)
-            i += 1
-        return i

src/bonsai/bonsai/tool/style.py

@@ -21,6 +21,7 @@ import numpy as np
 import ifcopenshell
 import ifcopenshell.util.element
 import ifcopenshell.util.representation
+import bonsai.core.style
 import bonsai.core.tool
 import bonsai.tool as tool
 import bonsai.bim.helper
@@ -695,3 +696,20 @@ class Style(bonsai.core.tool.Style):
         blender_material = tool.Ifc.get_object(style)
         # Will implicitly update the style name using handler.
         blender_material.name = name
+
+    @classmethod
+    def purge_unused_styles(cls) -> int:
+        """Purge unused styles (and related Blender materials).
+
+        Note that Styles UI should be updated manually after using this method.
+        """
+
+        ifc_file = tool.Ifc.get()
+        elements = ifc_file.by_type("IfcPresentationStyle")
+        i = 0
+        for element in elements:
+            if ifc_file.get_total_inverses(element) != 0:
+                continue
+            bonsai.core.style.remove_style(tool.Ifc, tool.Style, element, reload_styles_ui=False)
+            i += 1
+        return i