Ditch the Enum.
AFAIC Using an enum property to list the materials has been superseded by using a pointer property to the ID object type. In this case a material.
Custom search data to UILayout.prop_search
Search custom properties in objects on the scene (Python)
Have used this option here. Given the property group a material property, which is a pointer to blend material, or None if not set.
An update method on this property sets the objects active material to the sauna specific one chosen.
Added a boolean property to material type to flag (poll)) it as a "Sauna Cloud" material. The only materials that poll will have this set as true.
A select menu is drawn by the UI using a UILayout.prop(...) (commented out) or with the ID template. (Note a custom operator to add material can be set here, I took out the generic add material_)
Other alterations.
Drew the context objects material slots in the panel and an option to add a new one. Further to this would be to define your own UIList to add the "Is sauna material" checkbox in the list, add a filter etc.
Displayed the is sauna material checkbox, in panel and prepended it to Material Preview panel, by way of example.
Set the context members material (context.material only exists in the PROPERTIES area, otherwise needs to be set for material operators) which can used in your addons custom operators, with buttons in this layout, as
mat = context.material
sc_mat = context.sauna_cloud_material
or in hindsight sc = context.sauna_cloud.
Changed the namespace from SC to SAUNA and would go as far as to say even SAUNA_CLOUD The naming convention, _PT_ for panel type. is all about limiting name clashes.
import bpy
from bpy.props import PointerProperty, BoolProperty
from bpy.types import PropertyGroup
class SaunaCloudPanel:
bl_space_type = 'VIEW_3D'
bl_region_type = 'UI'
bl_category = "Sauna"
@classmethod
def poll(cls, context):
ao = context.active_object
return ao and ao.type == 'MESH'
class SAUNA_PT_Wall(SaunaCloudPanel, bpy.types.Panel):
bl_idname = "SAUNA_PT_Wall"
bl_label = "Wall"
def draw(self, context):
layout = self.layout
sc = context.scene.saunacloud
ob = context.active_object
mat = ob.active_material
layout.context_pointer_set("material", mat)
layout.context_pointer_set("sauna_cloud_material", sc.material)
box = layout.box()
box.prop(ob, "name")
col = box.column()
col.template_list("MATERIAL_UL_matslots", "", ob, "material_slots", ob, "active_material_index", rows=5)
col.operator("object.material_slot_add")
if mat:
col.prop(mat, "is_sauna_cloud")
#col.prop(sc, 'material', text=getattr(sc.material, "name", "None"))
col.template_ID(sc, "material")
class SAUNA_Global_Props(PropertyGroup):
def poll_material(self, material):
print("poll", material.name, material.is_sauna_cloud)
return material.is_sauna_cloud
def update_material(self, context):
scene = self.id_data
sc = self
ob = context.object
mat = self.material
# debug print
print(f"Update object: {ob.name} with material: {mat.name}")
ob.active_material = mat
material : PointerProperty(
type=bpy.types.Material,
poll=poll_material,
update=update_material,
)
classes = (
SAUNA_Global_Props,
SAUNA_PT_Wall,
)
def draw_sc_material_checkbox(self, context):
mat = getattr(context, "material", None)
self.layout.label(text=mat.name if mat else "None")
if mat:
self.layout.prop(mat, "is_sauna_cloud")
def register():
for cls in classes:
bpy.utils.register_class(cls)
bpy.types.Scene.saunacloud = bpy.props.PointerProperty(type=SAUNA_Global_Props)
bpy.types.Material.is_sauna_cloud = BoolProperty()
bpy.types.MATERIAL_PT_preview.prepend(draw_sc_material_checkbox)
def unregister():
for cls in classes:
bpy.utils.unregister_class(cls)
bpy.types.MATERIAL_PT_preview.remove(draw_sc_material_checkbox)
if __name__ == "__main__":
register()