Stair Modifier - support typing units in props

Example - https://i.imgur.com/XQsVge1.png

src/blenderbim/blenderbim/bim/module/model/prop.py

@@ -176,6 +176,7 @@ class BIMArrayProperties(PropertyGroup):
 
 
 class BIMStairProperties(PropertyGroup):
+    non_si_units_props = ("is_editing", "number_of_treads", "has_top_nib", "stair_type")
     stair_types = (
         ("CONCRETE", "Concrete", ""),
         ("WOOD/STEEL", "Wood / Steel", ""),
@@ -184,17 +185,17 @@ class BIMStairProperties(PropertyGroup):
 
     stair_added_previously: bpy.props.BoolProperty(default=False)
     is_editing: bpy.props.IntProperty(default=-1)
-    width: bpy.props.FloatProperty(name="Width", default=1.2, soft_min=0.01)
-    height: bpy.props.FloatProperty(name="Height", default=1.0, soft_min=0.01)
+    width: bpy.props.FloatProperty(name="Width", default=1.2, soft_min=0.01, subtype="DISTANCE")
+    height: bpy.props.FloatProperty(name="Height", default=1.0, soft_min=0.01, subtype="DISTANCE")
     number_of_treads: bpy.props.IntProperty(name="Number of treads", default=6, soft_min=1)
-    tread_depth: bpy.props.FloatProperty(name="Tread Depth", default=0.25, soft_min=0.01)
-    tread_run: bpy.props.FloatProperty(name="Tread Run", default=0.3, soft_min=0.01)
-    base_slab_depth: bpy.props.FloatProperty(name="Base slab depth", default=0.25, soft_min=0)
-    top_slab_depth: bpy.props.FloatProperty(name="Top slab depth", default=0.25, soft_min=0)
+    tread_depth: bpy.props.FloatProperty(name="Tread Depth", default=0.25, soft_min=0.01, subtype="DISTANCE")
+    tread_run: bpy.props.FloatProperty(name="Tread Run", default=0.3, soft_min=0.01, subtype="DISTANCE")
+    base_slab_depth: bpy.props.FloatProperty(name="Base slab depth", default=0.25, soft_min=0, subtype="DISTANCE")
+    top_slab_depth: bpy.props.FloatProperty(name="Top slab depth", default=0.25, soft_min=0, subtype="DISTANCE")
     has_top_nib: bpy.props.BoolProperty(name="Has top nib", default=True)
     stair_type: bpy.props.EnumProperty(name="Stair type", items=stair_types, default="CONCRETE")
 
-    def get_props_kwargs(self):
+    def get_props_kwargs(self, convert_to_project_units=False):
         stair_kwargs = {
             "stair_type": self.stair_type,
             "width": self.width,
@@ -204,27 +205,42 @@ class BIMStairProperties(PropertyGroup):
         }
 
         if self.stair_type == "CONCRETE":
-            stair_kwargs.update(
-                {
-                    "base_slab_depth": self.base_slab_depth,
-                    "top_slab_depth": self.top_slab_depth,
-                    "has_top_nib": self.has_top_nib,
-                    "tread_depth": self.tread_depth,
-                }
-            )
-            return stair_kwargs
+            concrete_props = {
+                "base_slab_depth": self.base_slab_depth,
+                "top_slab_depth": self.top_slab_depth,
+                "has_top_nib": self.has_top_nib,
+                "tread_depth": self.tread_depth,
+            }
+            stair_kwargs.update(concrete_props)
 
         elif self.stair_type == "WOOD/STEEL":
-            stair_kwargs.update(
-                {
-                    "tread_depth": self.tread_depth,
-                }
-            )
-            return stair_kwargs
+            wood_steel_props = {
+                "tread_depth": self.tread_depth,
+            }
+            stair_kwargs.update(wood_steel_props)
 
         elif self.stair_type == "GENERIC":
+            pass
+
+        if not convert_to_project_units:
             return stair_kwargs
 
+        si_conversion = ifcopenshell.util.unit.calculate_unit_scale(tool.Ifc.get())
+        for prop_name in stair_kwargs:
+            if prop_name in self.non_si_units_props:
+                continue
+            prop_value = stair_kwargs[prop_name]
+            stair_kwargs[prop_name] = prop_value / si_conversion
+        return stair_kwargs
+
+    def set_props_kwargs_from_ifc_data(self, kwargs):
+        si_conversion = ifcopenshell.util.unit.calculate_unit_scale(tool.Ifc.get())
+        for prop_name in kwargs:
+            prop_value = kwargs[prop_name]
+            if prop_name not in self.non_si_units_props:
+                prop_value = prop_value * si_conversion
+            setattr(self, prop_name, prop_value)
+
 
 class BIMSverchokProperties(PropertyGroup):
     node_group: bpy.props.PointerProperty(name="Node Group", type=NodeTree)

src/blenderbim/blenderbim/bim/module/model/stair.py

@@ -214,14 +214,6 @@ def generate_stair_2d_profile(
 def update_stair_modifier(context):
     obj = context.active_object
     props_kwargs = obj.BIMStairProperties.get_props_kwargs()
-
-    si_conversion = ifcopenshell.util.unit.calculate_unit_scale(tool.Ifc.get())
-    for prop_name in props_kwargs:
-        if prop_name in ("is_editing", "number_of_treads", "has_top_nib", "stair_type"):
-            continue
-        prop_value = props_kwargs[prop_name]
-        props_kwargs[prop_name] = prop_value * si_conversion
-
     vertices, edges, faces = generate_stair_2d_profile(**props_kwargs)
 
     obj = context.object
@@ -360,14 +352,7 @@ class AddStair(bpy.types.Operator, tool.Ifc.Operator):
             self.report({"ERROR"}, "Object has to be IfcStairFlight/IfcStairFlightType to add a stair.")
             return {"CANCELLED"}
 
-        # need to make sure all default props will have correct units
-        if not props.stair_added_previously:
-            convert_property_group_from_si(
-                props,
-                skip_props=("stair_added_previously", "is_editing", "number_of_treads", "has_top_nib", "stair_type"),
-            )
-
-        stair_data = props.get_props_kwargs()
+        stair_data = props.get_props_kwargs(convert_to_project_units=True)
         pset = tool.Pset.get_element_pset(element, "BBIM_Stair")
         if not pset:
             pset = ifcopenshell.api.run("pset.add_pset", ifc_file, product=element, name="BBIM_Stair")
@@ -393,8 +378,7 @@ class CancelEditingStair(bpy.types.Operator, tool.Ifc.Operator):
         data = json.loads(ifcopenshell.util.element.get_pset(element, "BBIM_Stair", "Data"))
         props = obj.BIMStairProperties
         # restore previous settings since editing was canceled
-        for prop_name in data:
-            setattr(props, prop_name, data[prop_name])
+        props.set_props_kwargs_from_ifc_data(data)
         update_stair_modifier(context)
 
         props.is_editing = -1
@@ -412,7 +396,7 @@ class FinishEditingStair(bpy.types.Operator, tool.Ifc.Operator):
         element = tool.Ifc.get_entity(obj)
         props = obj.BIMStairProperties
 
-        data = props.get_props_kwargs()
+        data = props.get_props_kwargs(convert_to_project_units=True)
         props.is_editing = -1
         update_stair_modifier(context)
 
@@ -436,15 +420,7 @@ class EnableEditingStair(bpy.types.Operator, tool.Ifc.Operator):
         element = tool.Ifc.get_entity(obj)
         data = json.loads(ifcopenshell.util.element.get_pset(element, "BBIM_Stair", "Data"))
         # required since we could load pset from .ifc and BIMStairProperties won't be set
-        for prop_name in data:
-            setattr(props, prop_name, data[prop_name])
-
-        # need to make sure all props that weren't used before
-        # will have correct units
-        skip_props = ("stair_added_previously", "is_editing", "number_of_treads", "has_top_nib", "stair_type")
-        skip_props += tuple(data.keys())
-        convert_property_group_from_si(props, skip_props=skip_props)
-
+        props.set_props_kwargs_from_ifc_data(data)
         props.is_editing = 1
         return {"FINISHED"}