[Bf-committers] [Bf-blender-cvs] SVN commit: /data/svn/bf-blender [37260] trunk/blender/source/blender: Support for update callbacks in python defined RNA properties as discussed last meeting .

[Campbell Barton]

@Matt, yes it does use the internal RNA update function, it also
disables the readonly state (if set) for the duration of the update
call.

Agree the animation system should be calling update functions though I
think we need to have it optimized for arrays.
If you have 20 layers all animated, ideally wouldn't call update 20
times for example.

Slightly related is the layer animation bug, where setting the layer
doesn't always work right because blender ensures at any point in time
at least 1 layer is enabled.

IMHO it's worth looking into collecting RNA writes per datablock and
assigning arrays so the 'set' functions get the new array as a single
assignment (currently each index is assigned individually).
With this we could run each properties update function once too.

- Campbell

On Sat, Jun 25, 2011 at 1:20 AM, Daniel Salazar - 3Developer.com
<zanqdo at gmail.com> wrote:
> Indeed it's weird.. see this example with a driver based on
> scene.frame_current. It will not update on frame change but it can be
> tricked to do so by adding a variable pointing to an object (even to
> itself) with an object level property animated. In this case I
> inserted a keyframe on bounding box display type! :p after that it
> will correctly update on frame change.. even if the variable isn't
> even used in the expression
>
> http://www.pasteall.org/blend/7167
>
> what's going on?
>
> cheers to you two!
>
> Daniel Salazar
> 3Developer.com
>
>
>
> On Fri, Jun 24, 2011 at 7:06 PM, Matt Ebb <matt at mke3.net> wrote:
>> On Tue, Jun 7, 2011 at 3:50 AM, Campbell Barton <ideasman42 at gmail.com>wrote:
>>
>>> Revision: 37260
>>>
>>> http://projects.blender.org/scm/viewvc.php?view=rev&root=bf-blender&revision=37260
>>> Author:   campbellbarton
>>> Date:     2011-06-06 17:50:20 +0000 (Mon, 06 Jun 2011)
>>> Log Message:
>>> -----------
>>> Support for update callbacks in python defined RNA properties as discussed
>>> last meeting.
>>> This means script authors can perform actions using these callbacks rather
>>> then on drawing which puts blender in a readonly state.
>>
>>
>> Late reply, I'm just getting some time to look into editing scripts to use
>> this and wanted to say thanks for this Campbell, it's great. Just to
>> clarify, is this implemented as a proper RNA update function which will act
>> exactly like any other C-defined ones? If so, that's great, but useful
>> either way.
>>
>> Probably worthwhile bringing up this issue again too (certain rna properties
>> not running update functions in animation system), since it may be affected:
>> http://lists.blender.org/pipermail/bf-committers/2010-November/029482.html
>>
>> cheers,
>>
>> Matt
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-- 
- Campbell