wm-scn property transfer

snippets/dev/handler_transfer_properties_between_scene_and_wm.py

@@ -0,0 +1,66 @@
+## Handler to save window_manager props to scene props when saving and inverse when loading
+## This allow to have fast properties that do not trigger a scene refresh when edited, but are still stored in scene.
+
+import bpy
+from bpy.app.handlers import persistent
+
+""" TODO: find a clean way to recursively replicate a collection property
+def recursive_crawl(d): WIP
+    if isinstance(d, dict):
+        for k, v in d.items():
+            print(k, ':')
+            recursive_crawl(v)
+
+    elif isinstance(d, list):
+        # print(d, 'is a list')
+        for item in d:
+            recursive_crawl(item)
+    else:
+        print(d)
+"""
+
+def transfer_properties(a, b):
+    for pr in a.bl_rna.properties:
+        if pr.is_readonly or pr.identifier == 'name':
+            continue
+        setattr(b, pr.identifier, getattr(a, pr.identifier))
+
+    for pr in a.bl_rna.properties:
+        if pr.type == 'COLLECTION':
+            ## Replicate collection items values
+            a_col = a.path_resolve(pr.identifier)
+            b_col = b.path_resolve(pr.identifier)
+            b_col.clear()
+            for a_item in a_col:
+                b_item = b_col.add()
+                for k, v in dict(a_item).items():
+                    setattr(b_item, k, v)
+            continue
+
+        if pr.is_readonly or pr.name == 'Name':
+            ## Skip readonly attributes or the default "Name"
+            # print('SKIP:', pr.identifier, pr.type) # Dbg
+            continue
+
+        setattr(b, pr.identifier, getattr(a, pr.identifier))
+
+@persistent
+def transfer_scn_to_win(dummy):
+    scn_props = bpy.context.scene.my_prop_group
+    win_props = bpy.context.window_manager.my_prop_group
+    transfer_properties(scn_props, win_props)
+
+@persistent
+def transfer_win_to_scn(dummy):
+    scn_props = bpy.context.scene.my_prop_group
+    win_props = bpy.context.window_manager.my_prop_group
+    transfer_properties(win_props, scn_props)
+
+
+def register():
+    bpy.app.handlers.load_post.append(transfer_scn_to_win)
+    bpy.app.handlers.save_pre.append(transfer_win_to_scn)
+
+def unregister():
+    bpy.app.handlers.save_pre.remove(transfer_win_to_scn)
+    bpy.app.handlers.load_post.remove(transfer_scn_to_win)