support for defining rna class properties as class attributes

eg:
 bpy.types.Scene.myprop = BoolProperty()
 
note, this uses an ugly python metaclass, this should be replaced with a C implimentation which is included but commented out, causing crashes in pythons GC which gives no hint as to where the bug comes from.

1 files changed, 69 insertions, 5 deletions

diff --git a/release/scripts/modules/bpy_types.py b/release/scripts/modules/bpy_types.py
index 923e9f91c9e..9219f7edcb0 100644
--- a/release/scripts/modules/bpy_types.py
+++ b/release/scripts/modules/bpy_types.py
@@ -18,6 +18,65 @@
 
 # <pep8 compliant>
 
+
+class RNA_IDProp_Meta(type):
+    # metaclass for all structures which can have rna prop's defined.
+    # important this class is defined first.
+
+    # setattr, so we can do this...
+    # bpy.types.Scene.myprop = bpy.props.BoolProperty()
+    def __setattr__(cls, attr, value):
+        if type(value) == tuple and len(value) == 2:
+            print(cls, attr, value)
+            if attr in cls.bl_rna.properties:
+                _bpy.props.RemoveProperty(cls, attr=attr)
+            func, kw = value
+            kw["attr"] = attr
+            func(cls, **kw)
+        else:
+            # XXX, pure evil, need to find a better way
+            _setattr = RNA_IDProp_Meta.__setattr__
+            del RNA_IDProp_Meta.__setattr__
+            try:
+                setattr(cls, attr, value)
+            except Exception as exc:
+                RNA_IDProp_Meta.__setattr__ = _setattr
+                raise exc
+            
+            RNA_IDProp_Meta.__setattr__ = _setattr
+
+    def __getattr__(cls, attr):
+        if attr in cls.bl_rna.properties:
+            return cls.bl_rna.properties[attr]
+        elif attr:
+            # XXX, pure evil, need to find a better way
+            _getattr = RNA_IDProp_Meta.__getattr__
+            del RNA_IDProp_Meta.__getattr__
+            try:
+                ret = getattr(cls, attr)
+            except Exception as exc:
+                RNA_IDProp_Meta.__getattr__ = _getattr
+                raise exc
+            
+            RNA_IDProp_Meta.__getattr__ = _getattr
+            return ret
+
+    def __delattr__(cls, attr):
+        if attr in cls.bl_rna.properties:
+            _bpy.props.RemoveProperty(cls, attr=attr)
+        elif attr:
+            # XXX, pure evil, need to find a better way
+            _delattr = RNA_IDProp_Meta.__delattr__
+            del RNA_IDProp_Meta.__delattr__
+            try:
+                delattr(cls, attr, value)
+            except Exception as exc:
+                RNA_IDProp_Meta.__delattr__ = _delattr
+                raise exc
+            
+            RNA_IDProp_Meta.__delattr__ = _delattr
+
+
 from _bpy import types as bpy_types
 import _bpy
 from mathutils import Vector
@@ -42,6 +101,10 @@ class Context(StructRNA):
         return new_context
 
 
+class ID(StructRNA, metaclass=RNA_IDProp_Meta):
+    __slots__ = ()
+
+
 class Library(bpy_types.ID):
     __slots__ = ()
 
@@ -60,7 +123,7 @@ class Library(bpy_types.ID):
         return tuple(id_block for attr in attr_links for id_block in getattr(bpy.data, attr) if id_block.library == self)
 
 
-class Texture(bpy_types.ID):
+class Texture(bpy_types.ID, metaclass=RNA_IDProp_Meta):
     __slots__ = ()
 
     @property
@@ -257,15 +320,15 @@ class _GenericBone:
         return bones
 
 
-class PoseBone(StructRNA, _GenericBone):
+class PoseBone(StructRNA, _GenericBone, metaclass=RNA_IDProp_Meta):
     __slots__ = ()
 
 
-class Bone(StructRNA, _GenericBone):
+class Bone(StructRNA, _GenericBone, metaclass=RNA_IDProp_Meta):
     __slots__ = ()
 
 
-class EditBone(StructRNA, _GenericBone):
+class EditBone(StructRNA, _GenericBone, metaclass=RNA_IDProp_Meta):
     __slots__ = ()
 
     def align_orientation(self, other):
@@ -617,12 +680,13 @@ class RNAMeta(type):
         return result
 
 
-class RNAMetaRegister(RNAMeta):
+class RNAMetaRegister(RNAMeta, RNA_IDProp_Meta):
     @classmethod
     def _register_immediate(cls):
         return True
 
 
+
 class OrderedMeta(RNAMeta):
 
     def __init__(cls, name, bases, attributes):