[Bf-python] How to use "set" callbacks on EnumProperty? GUI no longer updates

[Henrique Nunes Jung]

Hello Сергей, thank you very much for your advice.

I just replaced the first element of the tuple by my unique ID and it works
like a charm. With this approach I can also remove all the "set" callback
stuff altogether, which makes a much better code and the GUI responds as
expected. The only minor annoyance is that I have to provide a string and
not my own data to the tuple, otherwise Blender complains, well I just
convert my ID to string and the job is done.

But regarding the GUI not updating stuff when we have a set callback, does
anybody think this might be a bug?

Henrique Jung

On 9 April 2016 at 20:04, Сергей <igelbox at gmail.com> wrote:

> Hello.
>
> From blender api documentation (
> https://www.blender.org/api/blender_python_api_2_77_release/bpy.props.html
> ):
> "items (sequence of string tuples or a function) – sequence of enum items
> formatted: [(identifier, name, description, "
>
> Try to pass your unique identifiers as first tuple element, e.g.:
>     devices = [("unique-device-id-1", "User-friendly device name",""),
>                ("unique-device-id-2", "User-friendly device
> name","duplicated name"),
>     ]
> then 'my_settings.device' returns your 'unique-device-id-1' or
> 'unique-device-id-2' identifiers (not non-unique 'User-friendly device
> name')
>
>
> 2016-04-08 6:34 GMT+03:00 Henrique Nunes Jung <henriquenj at gmail.com>:
>
>> Hello bf-python! This is my first time posting on this list.
>>
>> I working on a plugin for Blender for some time now and I'm having some
>> issues when using the EnumProperty object. My objective is to provide a
>> drop-down menu for the user where he/she can select a given device from a
>> list. I then want to retrieve the currently selected device and perform
>> some initialization.
>>
>> Well I managed to create the menu and populated it with my device list -
>> which are strings, basically. But when the user select the device he wants,
>> I can only access the string that is currently selected, and not the unique
>> identifier of the string (such as an index). This can cause bugs on my
>> plugin since I can have two devices with the same name.
>>
>> One of my attempted solutions is using the "set" callback from the
>> EnumProperties, that I can capture the "value" argument and use as an
>> index. But there's one problem, as soon as I set a "set" callback function,
>> the menu itself stop updating with the selected device, even though I
>> receive the right value on my callback.
>>
>> Here's a sample
>>
>>         cls.device = EnumProperty(
>>                 name="Device",
>>                 description="Device to use for rendering",
>>                 items=my_devices,
>>                 set=set_my_device,
>>                 )
>>
>> def set_my_device(self, value):
>>     print("Device index is {0}".format(value))
>>     return None
>>
>>
>>
>> I do receive the "Device index is X" with the right index, but the user
>> interface does not change. I'm following the tutorial available on Property
>> documentation [1], my guess is that I'm suppose to do something within the
>> callback to get the right option to appear selected on Blender, but I don't
>> know what it is.
>>
>> Attached there's a minimal sample that you can copy and paste into
>> blender to reproduce the problem. Button appears on the Render panel, below
>> the  render button. I'm testing in 2.76b.
>>
>> I stuck into this problem for some time and would really appreciate any
>> help, or maybe some other solution to get the index from EnumProperty.
>>
>> Henrique Jung
>>
>> [1]
>> https://www.blender.org/api/blender_python_api_current/bpy.props.html#get-set-example
>>
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>>
>
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