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
from bl_ui import properties_render
import bpy
from bpy.props import (BoolProperty,
EnumProperty,
FloatProperty,
IntProperty,
PointerProperty)
def my_devices(scene, context):
devices = [("Device 1", "Device 1","", 1),
("Device 2", "Device 2","", 2),
]
return devices
def set_my_device(self, value):
print("Device index is {0}".format(value))
return None
class MySettings(bpy.types.PropertyGroup):
@classmethod
def register(cls):
bpy.types.Scene.my_settings = PointerProperty(
name = "My settings",
description = "My settings properties",
type=MySettings)
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("Index is now {0}".format(value))
return None
@classmethod
def unregister(cls):
del bpy.types.Scene.my_settings
def my_options(self, context):
self.layout.prop(context.scene.my_settings,"device")
def register():
bpy.utils.register_class(MySettings)
properties_render.RENDER_PT_render.append(my_options)
if __name__ == "__main__":
register()
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