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import bpy
def collect_baseclasses(_class, bases):
if _class is type or _class is object:
return bases
bases.append(_class)
for _superclass in _class.__bases__:
collect_baseclasses(_superclass, bases)
return bases
def collect_subclasses(_class, subs):
if _class is type or _class is object:
return subs
subs.append(_class)
for _subclass in _class.__subclasses__():
collect_subclasses(_subclass, subs)
return subs
class DynMenu(bpy.types.Menu):
def draw(self, context):
'''
This is a draw function that is used to call all subclasses draw functions
starting from the registered classes draw function and working down.
DynMenu.setup() must be called first.
Sort/group classes could be nice
'''
subclass_ls = []
collect_subclasses(self.__class__, subclass_ls)
# print(subclass_ls)
for subclass in subclass_ls:
# print("drawwing", subclass) # , dir(subclass))
subclass.internal_draw(self, context)
# print("subclass.internal_draw", subclass.internal_draw)
def setup(menu_class):
'''
Setup subclasses (not needed when self.add() is used)
'''
bases = collect_baseclasses(menu_class, [])
# Incase 'DynMenu' isnt last
while bases[-1] is not DynMenu:
bases.pop()
bases.pop() # remove 'DynMenu'
root_class = bases[-1] # this is the registered class
for subclass in collect_subclasses(root_class, []):
#print(subclass)
draw = getattr(subclass, 'draw', None)
if draw and not hasattr(subclass, 'internal_draw'):
# print("replace", subclass, draw)
try:
del subclass.draw
except:
pass
subclass.internal_draw = draw
root_class.draw = DynMenu.draw
def add(menu_class, func):
'''
Add a single function directly without having to make a class
important that the returned value should be stored in the module that called it.
'''
newclass = type('<menuclass>', (menu_class,), {})
newclass.internal_draw = func
setup(menu_class)
return newclass
'''
# so we dont need to import this module
DynMenu.setup = setup
DynMenu.add = add
# Only so we can access as bpy.types.
# dont ever use this directly!
bpy.types.register(DynMenu)
'''
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