Procedural override for default blender panels, hide keying panels #3842

also fixed the issue with default scene panels that were parented to other panels - because we didn't change `bl_parent_id` the panel structure for them was broken.

src/blenderbim/blenderbim/bim/__init__.py

@@ -293,9 +293,14 @@ def unregister():
         "SCENE_PT_audio",
         "SCENE_PT_keying_sets",
         "SCENE_PT_simulation",
-        "SCENE_PT_custom_props",
+        "SCENE_PT_custom_props",  # 4.0
+        # after SCENE_PT_keying_sets
+        "SCENE_PT_keying_set_paths" "SCENE_PT_keyframing_settings",
     ]:
         try:
             bpy.utils.unregister_class(getattr(handler, f"Override_{panel}"))
         except:
+            # NOTE: breaks Blender UI on unregister
+            # since default Blender panels are unregistered on load_post
+            # unregistering our override panels removes them from Blender completely
             pass

src/blenderbim/blenderbim/bim/handler.py

@@ -253,85 +253,38 @@ def viewport_shading_changed_callback(area):
         bpy.context.scene.BIMStylesProperties.active_style_type = "External"
 
 
-if getattr(bpy.types, "SCENE_PT_scene"):
+@classmethod
+def poll_check_blender_tab(cls, context):
+    return tool.Blender.is_tab(context, "BLENDER")
 
-    class Override_SCENE_PT_scene(bpy.types.SCENE_PT_scene):
+
-        bl_idname = "SCENE_PT_scene_override"
+def get_override_scene_panel(panel_name):
+    original_panel = getattr(bpy.types, panel_name, None)
+    if original_panel is None:
+        return
+
+    override_panel = type(f"Override_{panel_name}", (original_panel,), {})
+    override_panel.bl_idname = f"{panel_name}_override"
+
+    # some blender panel depend on other and register_class will throw an error
+    # if we won't override their `bl_parent_id`
+    bl_parent_id = getattr(override_panel, "bl_parent_id", None)
+    if bl_parent_id is not None:
+        override_panel.bl_parent_id = f"{bl_parent_id}_override"
+
+    # override poll method
+    poll = getattr(override_panel, "poll", None)
+    if poll is None:
+        override_panel.poll = poll_check_blender_tab
+    else:
 
         @classmethod
-        def poll(cls, context):
+        def wrapped_poll(cls, context):
-            return tool.Blender.is_tab(context, "BLENDER")
+            return super(override_panel, cls).poll(context) and poll_check_blender_tab.__func__(cls, context)
 
+        override_panel.poll = wrapped_poll
 
-if getattr(bpy.types, "SCENE_PT_unit"):
+    return override_panel
-
-    class Override_SCENE_PT_unit(bpy.types.SCENE_PT_unit):
-        bl_idname = "SCENE_PT_unit_override"
-
-        @classmethod
-        def poll(cls, context):
-            return tool.Blender.is_tab(context, "BLENDER")
-
-
-if getattr(bpy.types, "SCENE_PT_physics"):
-
-    class Override_SCENE_PT_physics(bpy.types.SCENE_PT_physics):
-        bl_idname = "SCENE_PT_physics_override"
-
-        @classmethod
-        def poll(cls, context):
-            return tool.Blender.is_tab(context, "BLENDER")
-
-
-if getattr(bpy.types, "SCENE_PT_rigid_body_world"):
-
-    class Override_SCENE_PT_rigid_body_world(bpy.types.SCENE_PT_rigid_body_world):
-        bl_idname = "SCENE_PT_rigid_body_world_override"
-
-        @classmethod
-        def poll(cls, context):
-            return tool.Blender.is_tab(context, "BLENDER")
-
-
-if getattr(bpy.types, "SCENE_PT_audio"):
-
-    class Override_SCENE_PT_audio(bpy.types.SCENE_PT_audio):
-        bl_idname = "SCENE_PT_audio_override"
-
-        @classmethod
-        def poll(cls, context):
-            return tool.Blender.is_tab(context, "BLENDER")
-
-
-if getattr(bpy.types, "SCENE_PT_keying_sets"):
-
-    class Override_SCENE_PT_keying_sets(bpy.types.SCENE_PT_keying_sets):
-        bl_idname = "SCENE_PT_keying_sets_override"
-
-        @classmethod
-        def poll(cls, context):
-            return tool.Blender.is_tab(context, "BLENDER")
-
-
-if getattr(bpy.types, "SCENE_PT_custom_props"):
-
-    class Override_SCENE_PT_custom_props(bpy.types.SCENE_PT_custom_props):
-        bl_idname = "SCENE_PT_custom_props_override"
-
-        @classmethod
-        def poll(cls, context):
-            return tool.Blender.is_tab(context, "BLENDER")
-
-
-# available on Blender 4.0+
-if getattr(bpy.types, "SCENE_PT_simulation", None):
-
-    class Override_SCENE_PT_simulation(bpy.types.SCENE_PT_simulation):
-        bl_idname = "SCENE_PT_simulation_override"
-
-        @classmethod
-        def poll(cls, context):
-            return tool.Blender.is_tab(context, "BLENDER")
 
 
 @persistent
@@ -379,16 +332,21 @@ def load_post(scene):
             "SCENE_PT_rigid_body_world",
             "SCENE_PT_audio",
             "SCENE_PT_keying_sets",
-            "SCENE_PT_simulation",
+            "SCENE_PT_simulation",  # 4.0+
             "SCENE_PT_custom_props",
+            # after SCENE_PT_keying_sets
+            "SCENE_PT_keying_set_paths",
+            "SCENE_PT_keyframing_settings",
         ]:
-            if getattr(bpy.types, panel, None):
+            try:
-                try:
+                override_panel = get_override_scene_panel(panel)
-                    bpy.utils.register_class(globals()[f"Override_{panel}"])
+                if override_panel is None:
-                    bpy.utils.unregister_class(getattr(bpy.types, panel))
+                    continue
-                except:
+                original_panel = getattr(bpy.types, panel)
-                    pass
+                bpy.utils.register_class(override_panel)
-
+                bpy.utils.unregister_class(original_panel)
+            except Exception:  # some panels belong to different Blender versions
+                pass
     # https://blender.stackexchange.com/questions/140644/how-can-make-the-state-of-a-boolean-property-relative-to-the-3d-view-area
     for screen in bpy.data.screens:
         if len(screen.BIMAreaProperties) == 20: