How to disable a checkbox when a dropdown option is picked?

Coding Python Support
1

I’m programming a Blender add-on.

I have a EnumProperty dropdown and a BoolProperty checkbox. When a particular EnumProperty value is selected from the dropdown, I want to disable the BoolProperty checkbox. Otherwise, the BoolProperty checkbox should be enabled.

How is this done? I haven’t been able to find an example. Thanks!

2 
import bpy


class HelloWorldPanel(bpy.types.Panel):
    """Creates a Panel in the Object properties window"""
    bl_label = "Hello World Panel"
    bl_idname = "OBJECT_PT_hello"
    bl_space_type = 'PROPERTIES'
    bl_region_type = 'WINDOW'
    bl_context = "scene"

    def draw(self, context):
        layout = self.layout

        layout.prop(context.scene, "my_enum")
        layout.prop(context.scene, "my_bool")


enum_items = (
    ('A', "Option A", ""),
    ('B', "Option B", ""),
)

def upd(self, context):
    if self.my_enum == 'B':
        self.my_bool = False

def register():
    bpy.utils.register_class(HelloWorldPanel)
    bpy.types.Scene.my_enum = bpy.props.EnumProperty(items=enum_items, update=upd)
    bpy.types.Scene.my_bool = bpy.props.BoolProperty()


def unregister():
    bpy.utils.unregister_class(HelloWorldPanel)


if __name__ == "__main__":
    register()

Tick the checkbox, then select Option B from dropdown - the checkbox will be unticked.

3

Thanks, CoDEmanX – that’s very, very close to what I would like to do. How would I disable the checkbox instead of unticking it?

4

That works pretty different, since it’s not on the data level but layout level:

import bpy


class HelloWorldPanel(bpy.types.Panel):
    """Creates a Panel in the Object properties window"""
    bl_label = "Hello World Panel"
    bl_idname = "OBJECT_PT_hello"
    bl_space_type = 'PROPERTIES'
    bl_region_type = 'WINDOW'
    bl_context = "scene"

    def draw(self, context):
        layout = self.layout
        scene = context.scene
        
        layout.prop(scene, "my_enum")
        
        col = layout.column()
        col.enabled = scene.my_enum != 'B'
        col.prop(context.scene, "my_bool")


enum_items = (
    ('A', "Option A", ""),
    ('B', "Option B", ""),
)


def register():
    bpy.utils.register_class(HelloWorldPanel)
    bpy.types.Scene.my_enum = bpy.props.EnumProperty(items=enum_items)
    bpy.types.Scene.my_bool = bpy.props.BoolProperty()


def unregister():
    bpy.utils.unregister_class(HelloWorldPanel)
    del bpy.types.Scene.my_enum
    del bpy.types.Scene.my_bool


if __name__ == "__main__":
    register()
5

Thanks, CoDEmanX – that’s exactly what I needed!