How to disable a single component in a custom panel?

Coding Python Support
1

I’m wondering how to disable, for instance, a checkbox (bpy.props.BoolProperty) in a custom panel coded in Python. To provide a minimal example, lets consider the following Add-On:

bl_info = {  "name": "Testing environment",
  "author": "Pieter Barendrecht",
  "version": (1, 0),
  "blender": (2, 5, 0),
  "location": "",
  "description": "Minimal example to test some layout properties.",
  "warning": "Completely useless for other purposes!",
  "wiki_url": "",
  "tracker_url": "",
  "category": "Mesh"}


import bpy


class TestPanel(bpy.types.Panel):
  bl_space_type = "PROPERTIES"
  bl_region_type = "WINDOW"
  bl_context = "physics"
  bl_label = "Test 123"
  
  bpy.types.Scene.TestCheckbox = bpy.props.BoolProperty(
  name = "Some Boolean property",
  description = "Enable me! Enable me!",
  default = False)
    
  def draw(self, context):
    Column = self.layout.column(align = True)    
    Column.prop(context.scene, "TestCheckbox")
    
def register():
  bpy.utils.register_class(TestPanel)
  
if __name__ == "__main__" :
  register()

How can I disable the TestCheckbox component in this panel (or make it inactive, that would also be acceptable)? Disabling an entire column at once can be done using

Column.enabled = False

which really disables the column, whereas using

Column.active = False

just results in a greyed-out column.

2

.enabled and .active are properties of UILayout and derived classes (such as what column() and row() return), so you really have to use them, you can’t disable the property itself. But if you want just that one property to be disabled, add another column or row to separate it from the rest:

col = layout.column()
sub = col.row() # you may also use .column() here!
sub.enabled = False
sub.prop(context.scene, "TestCheckbox")
col.prop(context.scene, "name") # another prop, same column but not disabled!
3

For some reason I didn’t think about that approach, thanks for your solution!