Units UI - match icons in enum with icons in ui list

To build a visual association
Example (previously enum had no icons)
https://files.catbox.moe/0ks3jj.png
https://files.catbox.moe/y1yrv5.png

src/bonsai/bonsai/bim/module/unit/data.py

@@ -61,23 +61,21 @@ class UnitsData:
             return ifcopenshell.util.unit.get_full_unit_name(unit)
 
     @classmethod
-    def unit_classes(cls):
+    def unit_classes(cls) -> tool.Blender.BLENDER_ENUM_ITEMS:
         assert (entity := tool.Ifc.schema().declaration_by_name("IfcNamedUnit").as_entity())
         declarations = ifcopenshell.util.schema.get_subtypes(entity)
         version = tool.Ifc.get_schema()
+        classes = sorted([d.name() for d in declarations]) + ["IfcDerivedUnit", "IfcMonetaryUnit"]
         results = [
-            (c, c, get_entity_doc(version, c).get("description", "")) for c in sorted([d.name() for d in declarations])
+            (
+                c,
+                c,
+                get_entity_doc(version, c).get("description", ""),
+                tool.Unit.get_icon_for_unit_class(c),
+                i,
+            )
+            for i, c in enumerate(classes)
         ]
-        results.extend(
-            [
-                ("IfcDerivedUnit", "IfcDerivedUnit", get_entity_doc(version, "IfcDerivedUnit").get("description", "")),
-                (
-                    "IfcMonetaryUnit",
-                    "IfcMonetaryUnit",
-                    get_entity_doc(version, "IfcMonetaryUnit").get("description", ""),
-                ),
-            ]
-        )
         return results
 
     @classmethod

src/bonsai/bonsai/bim/module/unit/ui.py

@@ -120,12 +120,7 @@ class BIM_UL_units(UIList):
     ) -> None:
         props = tool.Unit.get_unit_props()
         if item:
-            icon = "MOD_MESHDEFORM"
-            if item.ifc_class == "IfcSIUnit":
-                icon = "SNAP_GRID"
-            elif item.ifc_class == "IfcMonetaryUnit":
-                icon = "COPY_ID"
-
+            icon = tool.Unit.get_icon_for_unit_class(item.ifc_class)
             row = layout.row(align=True)
             row.label(text=item.unit_type or "No Type", icon=icon)
             row.label(text=item.name or "Unnamed")

src/bonsai/bonsai/tool/unit.py

@@ -206,3 +206,11 @@ class Unit(bonsai.core.tool.Unit):
             precision = 1e-5
             decimal_places = 5
         return str(round(precision * round(value / precision), decimal_places))
+
+    @classmethod
+    def get_icon_for_unit_class(cls, ifc_class: str) -> str:
+        if ifc_class == "IfcSIUnit":
+            return "SNAP_GRID"
+        elif ifc_class == "IfcMonetaryUnit":
+            return "COPY_ID"
+        return "MOD_MESHDEFORM"