Choosing right context for property in viewport panel

Question

I have a simple panel that you can see in the viewport which is a shorter version of UI Panel Simple. Seeing from other panels, by using Edit Source, they all define a context where the property is added, but how do I decide which one to use to get it working? Using Blender 2.92.

import bpy
from bpy.props import BoolProperty
class HelloWorldPanel(bpy.types.Panel):
    bl_label = "Hello World Panel"
    bl_idname = "OBJECT_PT_hello"
    bl_space_type = 'VIEW_3D'
    bl_region_type = 'UI'
    bl_category = "Tool"
def draw(self, context):
    layout = self.layout
    row = layout.row()
    row.label(text=&quot;Hello world!&quot;, icon='WORLD_DATA')



class QuickRename_PT_Panel(bpy.types.Panel):
    bl_space_type = 'VIEW_3D'
    bl_region_type = 'UI'
    bl_label = "Quick Rename"
    bl_category = "Tool"
    bl_parent_id = "OBJECT_PT_hello"
testBool: BoolProperty(
    name = 'Test',
    description = 'Test description',
    default = True,)


def draw(self, context):
    layout = self.layout
    layout.use_property_split = True
    layout.use_property_decorate = False

    tool_settings = context.tool_settings

    row = layout.row()
    row.prop(tool_settings, 'testBool')




def register():
    bpy.utils.register_class(HelloWorldPanel)
    bpy.utils.register_class(QuickRename_PT_Panel)
def unregister():
    bpy.utils.unregister_class(QuickRename_PT_Panel)
    bpy.utils.unregister_class(HelloWorldPanel)
if name == "main":
    register()

I want to add the testBool property to the Hello World Panel.

But I think the

tool_settings = context.tool_settings

is wrong.

We do not declare properties in panel classes. Either use a property group or register your property directly to the scene: https://blender.stackexchange.com/questions/57306/how-to-create-a-custom-ui — brockmann, Apr 09 '21 at 14:12
or AFAIK also not on any non ID types (those in bpy.data collections like Objects, and bones) eg bpy.types.ToolSettings.test_bool = bpy.props.BoolProperty() then in python console type in C.tool_settings.test_bool If it is not True or False ' can't do it. — batFINGER, Apr 12 '21 at 06:16
Yes, thats why I added the answer with the link to How to create a custom UI? and working code — Lala_Ghost, Apr 12 '21 at 07:03

score 0 · Answer 1 · edited Apr 12 '21 at 07:09

Okay by looking at How to create a custom UI? I could figure it out

import bpy
from bpy.props import BoolProperty, PointerProperty
from bpy.types import PropertyGroup
class HelloWorldPanel(bpy.types.Panel):
    bl_label = "Hello World Panel"
    bl_idname = "OBJECT_PT_hello"
    bl_space_type = 'VIEW_3D'
    bl_region_type = 'UI'
    bl_category = 'Tool'
def draw(self, context):
    layout = self.layout
    row = layout.row()
    row.label(text=&quot;Hello world!&quot;, icon='WORLD_DATA')



class QuickRenameProperties(PropertyGroup):
    test_bool: BoolProperty(
        name = 'Test',
        description = 'Test description',
        default = True)
class QuickRename_PT_Panel(bpy.types.Panel):
    bl_space_type = 'VIEW_3D'
    bl_region_type = 'UI'
    bl_label = "Quick Rename"
    bl_category = "Tool"
    bl_parent_id = "OBJECT_PT_hello"
def draw(self, context):
    layout = self.layout
    layout.use_property_split = True
    layout.use_property_decorate = False
    scene = context.scene
    mytool = scene.my_tool

    row = layout.row()
    row.prop(mytool, 'test_bool')



def register():
    bpy.utils.register_class(HelloWorldPanel)
    bpy.utils.register_class(QuickRename_PT_Panel)
    bpy.utils.register_class(QuickRenameProperties)
    bpy.types.Scene.my_tool = PointerProperty(type = QuickRenameProperties)
def unregister():
    bpy.utils.unregister_class(QuickRename_PT_Panel)
    bpy.utils.unregister_class(HelloWorldPanel)
    del bpy.types.Scene.my_tool
if name == "main":
    register()

Choosing right context for property in viewport panel

1 Answers1