Fix a bug in the viewport when deleting objects

README.md

@@ -3,7 +3,7 @@
 ![GitHub release (latest by date)](https://img.shields.io/github/v/release/InteractiveComputerGraphics/blender-sequence-loader)
 [![Documentation Status](https://readthedocs.org/projects/blender-sequence-loader/badge/?version=latest)](https://blender-sequence-loader.readthedocs.io/en/latest/?badge=latest)
 
-This is an addon for Blender 3.4+ (might work with 2.8+ but is not extensively tested on less recent versions) that enables loading of file sequences. The addon comes bundled together with [meshio](https://github.com/nschloe/meshio) which enables the loading of geometric data from a multitude of file formats. As stated there, the supported formats are listed in the following. Note that not all of the formats have been tested and some issues may still occur.
+This is an addon for Blender 4.0+ (might work with 2.8+ but is not extensively tested on less recent versions) that enables loading of file sequences. The addon comes bundled together with [meshio](https://github.com/nschloe/meshio) which enables the loading of geometric data from a multitude of file formats. As stated there, the supported formats are listed in the following. Note that not all of the formats have been tested and some issues may still occur.
 
 > [Abaqus](http://abaqus.software.polimi.it/v6.14/index.html) (`.inp`),
 > ANSYS msh (`.msh`),

__init__.py

@@ -2,8 +2,8 @@
     "name": "Sequence Loader",
     "description": "Loader for meshio supported mesh files/ simulation sequences",
     "author": "Interactive Computer Graphics",
-    "version": (0, 2, 0),
-    "blender": (3, 6, 0),
+    "version": (0, 3, 0),
+    "blender": (4, 0, 0),
     "warning": "",
     "support": "COMMUNITY",
     "category": "Import-Export",

bseq/__init__.py

@@ -12,9 +12,13 @@
 @persistent
 def BSEQ_initialize(scene):
     if update_obj not in bpy.app.handlers.frame_change_post:
+        bpy.app.handlers.frame_change_post.append(update_obj)
+    if auto_refresh_active not in bpy.app.handlers.frame_change_post:
         bpy.app.handlers.frame_change_post.append(auto_refresh_active)
+    if auto_refresh_all not in bpy.app.handlers.frame_change_post:
         bpy.app.handlers.frame_change_post.append(auto_refresh_all)
-        bpy.app.handlers.frame_change_post.append(update_obj)
+    if clean_unused_bseq_data not in bpy.app.handlers.save_pre:
+        bpy.app.handlers.save_pre.append(clean_unused_bseq_data)
     subscribe_to_selected()
     if print_information not in bpy.app.handlers.render_init:
         bpy.app.handlers.render_init.append(print_information)

bseq/globals.py

@@ -51,4 +51,14 @@ def auto_refresh_active(scene, depsgraph=None):
             continue
         if obj.mode != "OBJECT":
             continue
-        refresh_obj(obj, scene)
+        refresh_obj(obj, scene)
+
+# This becomes necessary, because when deleting objects from the viewport, they dont actually get removed from the
+# sequences list, because this is not a global delete. This handler only removes sequences that are not referenced
+# in any scene or collection. This handler is added to save_pre, so that unused data blocks dont get saved
+def clean_unused_bseq_data(savefile):
+    for obj in bpy.data.objects:
+        if obj.BSEQ.init and len(obj.users_collection)==0 and len(obj.users_scene)==0:
+
+            # This will throw an error if it is actually still used somewhere
+            bpy.data.objects.remove(obj)

bseq/panels.py

@@ -13,7 +13,7 @@ def filter_items(self, context, data, property):
         #  not sure if I understand correctly about this
         #  see reference from https://docs.blender.org/api/current/bpy.types.UIList.html#advanced-uilist-example-filtering-and-reordering
         for o in objs:
-            if o.BSEQ.init:
+            if o.BSEQ.init and len(o.users_collection)>0 and len(o.users_scene)>0:
                 flt_flags.append(self.bitflag_filter_item)
             else:
                 flt_flags.append(0)