Show warning if a blend file is used alongside an ifc

src/blenderbim/blenderbim/bim/__init__.py

@@ -103,6 +103,7 @@ classes = [
     operator.BIM_OT_show_description,
     operator.BIM_OT_multiple_file_selector,
     operator.ClippingPlaneCutWithCappings,
+    operator.CloseBlendWarning,
     operator.CloseError,
     operator.EditBlenderCollection,
     operator.FileAssociate,

src/blenderbim/blenderbim/bim/handler.py

@@ -304,3 +304,6 @@ def load_post(scene):
             continue
         tool.Blender.override_scene_panel(panel)
     tool.Blender.setup_tabs()
+
+    if tool.Ifc.get() and bpy.data.is_saved:
+        bpy.context.scene.BIMProperties.has_blend_warning = True

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

@@ -128,6 +128,15 @@ class BIM_PT_project(Panel):
         if pprops.is_loading:
             self.draw_advanced_loading_ui(context)
         elif self.file or props.ifc_file:
+            if props.has_blend_warning:
+                box = self.layout.box()
+                box.alert = True
+                row = box.row(align=True)
+                row.label(text="Your Model May Be Outdated", icon="ERROR")
+                op = row.operator("bim.open_uri", text="", icon="QUESTION")
+                op.uri = "https://docs.blenderbim.org/users/troubleshooting.html#saving-and-loading-blend-files"
+                row.operator("bim.close_blend_warning", text="", icon="CANCEL")
+
             if props.ifc_file:
                 self.draw_loaded_project_ui(context)
             else:

src/blenderbim/blenderbim/bim/operator.py

@@ -106,6 +106,21 @@ class CloseError(bpy.types.Operator):
         return context.window_manager.invoke_props_dialog(self)
 
 
+class CloseBlendWarning(bpy.types.Operator):
+    bl_idname = "bim.close_blend_warning"
+    bl_label = "Close Blend Warning"
+
+    def execute(self, context):
+        bpy.context.scene.BIMProperties.has_blend_warning = False
+        return {"FINISHED"}
+
+    def draw(self, context):
+        self.layout.label(text="Warning: you may experience errors. Really continue?")
+
+    def invoke(self, context, event):
+        return context.window_manager.invoke_props_dialog(self)
+
+
 class SelectURIAttribute(bpy.types.Operator):
     bl_idname = "bim.select_uri_attribute"
     bl_label = "Select URI Attribute"

src/blenderbim/blenderbim/bim/prop.py

@@ -385,6 +385,7 @@ class BIMProperties(PropertyGroup):
     data_dir: StringProperty(
         default=os.path.join(cwd, "data") + os.path.sep, name="Data Directory", update=update_data_dir
     )
+    has_blend_warning: BoolProperty(name="Has Blend Warning", default=False)
     pset_dir: StringProperty(default=os.path.join("psets") + os.path.sep, name="Default Psets Directory")
     ifc_file: StringProperty(name="IFC File", update=update_ifc_file)
     last_transaction: StringProperty(name="Last Transaction")