Hi,
comments inline ...
> At the moment, this type holds the original image and calculates a
> thumbnail, additionally it stores the thumbnail size in a int Field.
>
> I'd like to be able to change the thumbnail size field value and then
> re-thumbnail the original image. At the moment, since the original
> image data is not changed, it justs preserves both images.
>
> How could i achieve this?
I have no clean solutions to offer currently. By coincidence, I've
been working lately on dependencies for
write process expressions (see https://svn.nuxeo.org/trac/pub/ticket/
1830)
but computeDependantFields is another story; the computation is
actually done in DataModel, before the
write expressions are evaluated by storage adapters. Adding some
dependencies following there would have
unwanted side effects.
I've taken a step back and changed the approach instead of using a new
image field type that can manipulate dependant fields, I switched to
using a new Integer field type, that holds the size value of the
thumbnail to compute. Thereby i could overcome the problem that the
resizing is triggered only when a new original image is uploaded, to a
resizing thats triggered when the size is changed.
> Maybe thios could be solved with a new action without customizing the
> document edit method.
It's a matter of UI. I guess a new action could be clearer for the
user: they might better understand that the change is active.
If you have a new action, then you can avoid the workflow script,
hence the duplication.
I'll try that way.
By the way, what you're implementing is generic and useful, so I'd
like to invite you to eventually include it in CPS for the 3.4.5
timeframe.
Requirements for that would be that:
- it doesn't break if PIL is missing.
- dependent fields and size field ids are configurable, so that it's
possible to resolve potential naming collisions.
A unit test for the computeDependantFields would be a nice icing on
the cake, too ;-)
Great, I'll send you the changes when finished, so you can have a
look. At the moment it's more a pragmatic approach, but in the future
...
Cheers, Michael
-----------------------------------------------------------
Michael Schulz
[EMAIL PROTECTED]
in medias res
Gesellschaft für Informationstechnologie mbH
In den Weihermatten 66
79108 Freiburg
Tel +49 (0)761 556959-5
Fax +49 (0)761 556959-6
http://www.webgis.de / http://www.zopecms.de
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