Improve mesh IFC Representation User Experience (#1710)

* Must be in object mode to update representation
This may prevent random CTDs due to invalidated data

* Use self.file instead of re-fetching from IfcStore

* Keep ifc parameters expanded when updating representation

* Clear previous ifc parameters when re-fetching

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

@@ -159,7 +159,7 @@ class AddRepresentation(bpy.types.Operator):
         mesh.name = "{}/{}".format(context_id, result.id())
         mesh.BIMMeshProperties.ifc_definition_id = int(result.id())
         obj.data = mesh
-        Data.load(IfcStore.get_file(), obj.BIMObjectProperties.ifc_definition_id)
+        Data.load(self.file, obj.BIMObjectProperties.ifc_definition_id)
 
         if product.is_a("IfcTypeProduct"):
             if self.file.schema == "IFC2X3":
@@ -168,7 +168,7 @@ class AddRepresentation(bpy.types.Operator):
                 types = product.Types
             if types:
                 for element in types[0].RelatedObjects:
-                    Data.load(IfcStore.get_file(), element.id())
+                    Data.load(self.file, element.id())
         return {"FINISHED"}
 
 
@@ -239,7 +239,7 @@ class SwitchRepresentation(bpy.types.Operator):
 
         if self.disable_opening_subtractions and self.context_of_items.ContextIdentifier == "Body":
             if self.oprops.ifc_definition_id not in VoidData.products:
-                VoidData.load(IfcStore.get_file(), self.oprops.ifc_definition_id)
+                VoidData.load(self.file, self.oprops.ifc_definition_id)
             for opening_id in VoidData.products[self.oprops.ifc_definition_id]:
                 opening = IfcStore.get_element(opening_id)
                 if not opening:
@@ -291,7 +291,7 @@ class RemoveRepresentation(bpy.types.Operator):
             "geometry.unassign_representation", self.file, **{"product": product, "representation": representation}
         )
         ifcopenshell.api.run("geometry.remove_representation", self.file, **{"representation": representation})
-        Data.load(IfcStore.get_file(), product.id())
+        Data.load(self.file, product.id())
         return {"FINISHED"}
 
 
@@ -302,6 +302,10 @@ class UpdateRepresentation(bpy.types.Operator):
     obj: bpy.props.StringProperty()
     ifc_representation_class: bpy.props.StringProperty()
 
+    @classmethod
+    def poll(cls, context):
+        return context.active_object.mode == "OBJECT"
+
     def execute(self, context):
         return IfcStore.execute_ifc_operator(self, context)
 
@@ -381,7 +385,9 @@ class UpdateRepresentation(bpy.types.Operator):
         obj.data.BIMMeshProperties.ifc_definition_id = int(new_representation.id())
         obj.data.name = f"{old_representation.ContextOfItems.id()}/{new_representation.id()}"
         bpy.ops.bim.remove_representation(representation_id=old_representation.id(), obj=obj.name)
-        Data.load(IfcStore.get_file(), obj.BIMObjectProperties.ifc_definition_id)
+        Data.load(self.file, obj.BIMObjectProperties.ifc_definition_id)
+        if obj.data.BIMMeshProperties.ifc_parameters:
+            bpy.ops.bim.get_representation_ifc_parameters()
 
 
 class UpdateParametricRepresentation(bpy.types.Operator):
@@ -390,15 +396,22 @@ class UpdateParametricRepresentation(bpy.types.Operator):
     bl_options = {"REGISTER", "UNDO"}
     index: bpy.props.IntProperty()
 
+    @classmethod
+    def poll(cls, context):
+        return context.active_object.mode == "OBJECT"
+
     def execute(self, context):
         self.file = IfcStore.get_file()
         obj = context.active_object
         props = obj.data.BIMMeshProperties
         parameter = props.ifc_parameters[self.index]
-        element = IfcStore.get_file().by_id(parameter.step_id)[parameter.index] = parameter.value
+        self.file.by_id(parameter.step_id)[parameter.index] = parameter.value
+        show_representation_parameters = bool(props.ifc_parameters)
         bpy.ops.bim.switch_representation(
             ifc_definition_id=props.ifc_definition_id, should_reload=True, should_switch_all_meshes=True
         )
+        if show_representation_parameters:
+            bpy.ops.bim.get_representation_ifc_parameters()
         return {"FINISHED"}
 
 
@@ -411,7 +424,8 @@ class GetRepresentationIfcParameters(bpy.types.Operator):
         self.file = IfcStore.get_file()
         obj = context.active_object
         props = obj.data.BIMMeshProperties
-        elements = IfcStore.get_file().traverse(IfcStore.get_file().by_id(props.ifc_definition_id))
+        elements = self.file.traverse(self.file.by_id(props.ifc_definition_id))
+        props.ifc_parameters.clear()
         for element in elements:
             if element.is_a("IfcRepresentationItem") or element.is_a("IfcParameterizedProfileDef"):
                 for i in range(0, len(element)):