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# ##### BEGIN GPL LICENSE BLOCK #####
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# ##### END GPL LICENSE BLOCK #####
# <pep8-80 compliant>
"""
Module to manage overriding various parts of Blender.
Intended for use with 'app_templates', though it can be used from anywhere.
"""
# TODO, how to check these aren't from add-ons.
# templates might need to un-register while filtering.
def class_filter(cls_parent, **kw):
whitelist = kw.pop("whitelist", None)
blacklist = kw.pop("blacklist", None)
kw_items = tuple(kw.items())
for cls in cls_parent.__subclasses__():
# same as is_registered()
if "bl_rna" in cls.__dict__:
if blacklist is not None and cls.__name__ in blacklist:
continue
if ((whitelist is not None and cls.__name__ is whitelist) or
all((getattr(cls, attr) in expect) for attr, expect in kw_items)):
yield cls
def ui_draw_filter_register(
*,
ui_ignore_classes=None,
ui_ignore_operator=None,
ui_ignore_property=None,
ui_ignore_menu=None,
ui_ignore_label=None
):
import bpy
UILayout = bpy.types.UILayout
if ui_ignore_classes is None:
ui_ignore_classes = (
bpy.types.Panel,
bpy.types.Menu,
bpy.types.Header,
)
class OperatorProperties_Fake:
pass
class UILayout_Fake(bpy.types.UILayout):
__slots__ = ()
def __getattribute__(self, attr):
# ensure we always pass down UILayout_Fake instances
if attr in {"row", "split", "column", "box", "column_flow"}:
real_func = UILayout.__getattribute__(self, attr)
def dummy_func(*args, **kw):
# print("wrapped", attr)
ret = real_func(*args, **kw)
return UILayout_Fake(ret)
return dummy_func
elif attr in {"operator", "operator_menu_enum", "operator_enum", "operator_menu_hold"}:
if ui_ignore_operator is None:
return UILayout.__getattribute__(self, attr)
real_func = UILayout.__getattribute__(self, attr)
def dummy_func(*args, **kw):
# print("wrapped", attr)
ui_test = ui_ignore_operator(args[0])
if ui_test is False:
ret = real_func(*args, **kw)
else:
if ui_test is None:
UILayout.__getattribute__(self, "label")("")
else:
assert(ui_test is True)
# may need to be set
ret = OperatorProperties_Fake()
return ret
return dummy_func
elif attr in {"prop", "prop_enum"}:
if ui_ignore_property is None:
return UILayout.__getattribute__(self, attr)
real_func = UILayout.__getattribute__(self, attr)
def dummy_func(*args, **kw):
# print("wrapped", attr)
ui_test = ui_ignore_property(args[0].__class__.__name__, args[1])
if ui_test is False:
ret = real_func(*args, **kw)
else:
if ui_test is None:
UILayout.__getattribute__(self, "label")("")
else:
assert(ui_test is True)
ret = None
return ret
return dummy_func
elif attr == "menu":
if ui_ignore_menu is None:
return UILayout.__getattribute__(self, attr)
real_func = UILayout.__getattribute__(self, attr)
def dummy_func(*args, **kw):
# print("wrapped", attr)
ui_test = ui_ignore_menu(args[0])
if ui_test is False:
ret = real_func(*args, **kw)
else:
if ui_test is None:
UILayout.__getattribute__(self, "label")("")
else:
assert(ui_test is True)
ret = None
return ret
return dummy_func
elif attr == "label":
if ui_ignore_label is None:
return UILayout.__getattribute__(self, attr)
real_func = UILayout.__getattribute__(self, attr)
def dummy_func(*args, **kw):
# print("wrapped", attr)
ui_test = ui_ignore_label(args[0] if args else kw.get("text", ""))
if ui_test is False:
ret = real_func(*args, **kw)
else:
if ui_test is None:
real_func("")
else:
assert(ui_test is True)
ret = None
return ret
return dummy_func
else:
return UILayout.__getattribute__(self, attr)
# print(self, attr)
def operator(*args, **kw):
return super().operator(*args, **kw)
def draw_override(func_orig, self_real, context):
cls_real = self_real.__class__
if cls_real is super:
# simple, no wrapping
return func_orig(self_real, context)
class Wrapper(cls_real):
__slots__ = ()
def __getattribute__(self, attr):
if attr == "layout":
return UILayout_Fake(self_real.layout)
else:
cls = super()
try:
return cls.__getattr__(self, attr)
except AttributeError:
# class variable
try:
return getattr(cls, attr)
except AttributeError:
# for preset bl_idname access
return getattr(UILayout(self), attr)
@property
def layout(self):
# print("wrapped")
return self_real.layout
return func_orig(Wrapper(self_real), context)
ui_ignore_store = []
for cls in ui_ignore_classes:
for subcls in list(cls.__subclasses__()):
if "draw" in subcls.__dict__: # don't want to get parents draw()
def replace_draw():
# function also serves to hold draw_old in a local name-space
draw_orig = subcls.draw
def draw(self, context):
return draw_override(draw_orig, self, context)
subcls.draw = draw
ui_ignore_store.append((subcls, "draw", subcls.draw))
replace_draw()
return ui_ignore_store
def ui_draw_filter_unregister(ui_ignore_store):
for (obj, attr, value) in ui_ignore_store:
setattr(obj, attr, value)
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