[Bf-python] re-ordering collection items

[Campbell Barton]

We could add a python `sort` function to rna, nothing inherently hard
about that,

But its a fair bit of grunt work.

- Modifiers cant _always_ be re-ordered, so rna sort would need to be
able to raise exceptions into Python (most likely using reports).
- Each different list type would need its own sort function. (though
we could have a generic one for arrays and ListBase which could be
used in most cases).
- Should support Python like operations key=lambda, compare function,
reverse=bool. etc.


On Wed, May 14, 2014 at 5:11 PM, CoDEmanX <codemanx at gmx.de> wrote:
> Some support re-ordering by re-assignment, just like regular python lists:
>
> m = Object.materials # assuming there are only two!
> m[0], m[1] = m[1], m[0]
>
> The Modifier stack does not support this. There is no other way to
> re-order modifiers than to use operators.
>
> CollectionProperty() creates objects from <class
> 'bpy_prop_collection_idprop'>, which comes with a handy method move().
> You give it the index of which element you want to move, and another
> index for the target position to swap these two elements.
>
>
> Am 14.05.2014 04:02, schrieb Tamito KAJIYAMA:
>> Hi,
>>
>> Is there a general way to re-order items of bpy_prop_collection
>> in Python? For example, how can we swap two modifiers in
>> bpy.context.object.modifiers? Since the collection is read-only,
>> the general Python sequence protocol seems not to work.
>>
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-- 
- Campbell