[Bf-committers] Decorator Pattern

[Campbell Barton]

Thanks for the correction.

You can wrap RNA instances in your own classes and pass them around.

eg:

>>> class MyDecorObject(bpy.types.Object):
...     @property
...     def my_prop(self):
...         return "Foo"
...
>>> o = MyDecorObject(bpy.context.object)
>>> o.my_prop
'Foo'

But this isn't done anywhere in Blender AFAIK

On Mon, Mar 12, 2018 at 10:31 PM, Toni Alatalo <toni at playsign.net> wrote:
> Python decorators do not implement the Decorator Pattern, they are
> different things. Wikipedia explains it like this:
>
> """ https://en.wikipedia.org/wiki/Decorator_pattern#Python
> Please do not confuse the Decorator Pattern (or an implementation of
> this design pattern in Python - as the above example) with Python
> Decorators, a Python language feature. They are different things.
>
> Second to the Python Wiki:
>
> The Decorator Pattern is a pattern described in the Design Patterns
> Book. It is a way of apparently modifying an object's behavior, by
> enclosing it inside a decorating object with a similar interface. This
> is not to be confused with Python Decorators, which is a language
> feature for dynamically modifying a function or class.[7]"""
>
> I'm not surprised if that pattern, nor other from the OO patterns
> movement, is not used in Blender at all. Curious to hear if it is,
> though :)
>
> -Toni
>
> On Mon, Mar 12, 2018 at 7:25 AM, Campbell Barton <ideasman42 at gmail.com> wrote:
>> Hi, Blender's built in scripts don't make much use of decorators
>> they are used here though:
>> https://docs.blender.org/api/2.79/bpy.app.handlers.html#persistent-handler-example
>>
>> On Mon, Mar 12, 2018 at 11:33 AM, Brad Eric hollister
>> <behollis at soe.ucsc.edu> wrote:
>>> Hi,
>>>
>>> I’m preparing a short talk on the decorator pattern for classroom instruction.
>>>
>>> I’d like to use an example from Blender. Are there any such examples in the codebase?
>>>
>>> Regards,
>>> Brad
>>> _______________________________________________
>>> Bf-committers mailing list
>>> Bf-committers at blender.org
>>> https://lists.blender.org/mailman/listinfo/bf-committers
>>
>>
>>
>> --
>> - Campbell
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-- 
- Campbell