I want to make it VERY obvious when auto keying is turned on in Blender. I want to write an add-on where, if auto keying is turned on, Blender's theme turns to Blender Light. Otherwise, Blender's theme is Blender Dark.

The core of the add-on is basically this:

if bpy.context.scene.tool_settings.use_keyframe_insert_auto == True:
    bpy.ops.script.execute_preset(menu_idname="USERPREF_MT_interface_theme_presets", filepath="C:\\Programs\\blender\\2.81\\scripts\\presets\\interface_theme\\blender_light.xml")
    bpy.ops.script.execute_preset(menu_idname="USERPREF_MT_interface_theme_presets", filepath="C:\\Programs\\blender\\2.81\\scripts\\presets\\interface_theme\\blender_dark.xml")

Is it possible -- via an add-on -- to intercept when use_keyframe_insert_auto changes and then have this code execute? If so, how?

If that's not possible, what is the recommended way of handling this?


You can use a message bus subscription to do that.

The following script will call a function when 'use_keyframe_insert_auto' is changing from the UI.

The principle is:

  • Obtain a subscription link using path_resolve on the scene
  • Then use this link to subscribe in order to fire a function when the value changes

Here is the code (look at the console to see the printed results):

import bpy

#The callback when use_keyframe_insert_auto changed
def a_callback(scene):
    print( scene, "use_keyframe_insert_auto changed" )

def subscribe_to_scene(scene):

    #Get a rna subscription link from the scene
    subscribe_to = scene.path_resolve("tool_settings.use_keyframe_insert_auto", False)

    #Effectively subscribe to the rna path from the scene


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.