display active representation presentation layer in UI

example - https://i.imgur.com/mpnoqPH.png

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

@@ -29,6 +29,7 @@ from blenderbim.bim.module.geometry.data import (
     PlacementData,
     DerivedCoordinatesData,
 )
+from blenderbim.bim.module.layer.data import LayersData
 
 
 def mode_menu(self, context):
@@ -133,6 +134,7 @@ class BIM_PT_representations(Panel):
 
         if not RepresentationsData.data["representations"]:
             layout.label(text="No Representations Found")
+            return
 
         for representation in RepresentationsData.data["representations"]:
             row = self.layout.row(align=True)
@@ -150,6 +152,18 @@ class BIM_PT_representations(Panel):
             op.ifc_definition_id = representation["id"]
             op.disable_opening_subtractions = False
             row.operator("bim.remove_representation", icon="X", text="").representation_id = representation["id"]
+            if representation["is_active"]:
+                active_representation = representation
+
+        layout.separator()
+        if not LayersData.is_loaded:
+            LayersData.load()
+        if LayersData.data["active_layers"]:
+            layout.label(text="Active Representation Presentation Layers:")
+            for layer_name in LayersData.data["active_layers"].values():
+                layout.label(text=layer_name, icon="STICKY_UVS_LOC")
+        else:
+            layout.label(text="Active Representation Has No Presentation Layers", icon="STICKY_UVS_LOC")
 
 
 class BIM_PT_representation_items(Panel):

src/blenderbim/blenderbim/bim/module/layer/data.py

@@ -47,8 +47,8 @@ class LayersData:
             return []
         if not isinstance(data, bpy.types.Mesh) or not data.BIMMeshProperties.ifc_definition_id:
             return []
-        results = []
+        results = dict()
         shape = tool.Ifc.get().by_id(data.BIMMeshProperties.ifc_definition_id)
         for inverse in shape.LayerAssignments:
-            results.append(inverse.id())
+            results[inverse.id()] = inverse.Name or "Unnamed"
         return results

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

@@ -84,6 +84,7 @@ class BIM_UL_layers(UIList):
                     op = row.operator("bim.assign_presentation_layer", text="", icon="KEYFRAME", emboss=False)
                     op.layer = item.ifc_definition_id
 
+            # TODO: replace placeholder UI for hiding presentation layers
             row.operator("bim.disable_editing_layer", text="", icon="HIDE_OFF", emboss=False)
             row.operator("bim.disable_editing_layer", text="", icon="FREEZE", emboss=False)