op_color_clear.py

import bpy
import bmesh
import operator
from mathutils import Vector
from collections import defaultdict
from math import pi

from . import utilities_color

class op(bpy.types.Operator):
    bl_idname = "uv.textools_color_clear"
    bl_label = "Clear Colors"
    bl_description = "Clears the Color IDs and materials on the selected model"
    bl_options = {'REGISTER', 'UNDO'}
    

    @classmethod
    def poll(cls, context):
        if not bpy.context.active_object:
            return False

        if bpy.context.active_object not in bpy.context.selected_objects:
            return False

        if bpy.context.active_object.type != 'MESH':
            return False

        #Only in UV editor mode
        if bpy.context.area.type != 'IMAGE_EDITOR':
            return False

        return True
    
    def execute(self, context):
        clear_colors(self, context)
        return {'FINISHED'}



def clear_colors(self, context):
    obj = bpy.context.active_object
    


    # Store previous mode
    previous_mode = bpy.context.active_object.mode
    if bpy.context.active_object.mode != 'EDIT':
        bpy.ops.object.mode_set(mode='EDIT')

    bm = bmesh.from_edit_mesh(bpy.context.active_object.data);

    # Set all faces
    for face in bm.faces:
        face.material_index = 0

    # Clear material slots
    bpy.ops.object.mode_set(mode='OBJECT')
    count = len(obj.material_slots)
    for i in range(count):
        bpy.ops.object.material_slot_remove()

    # Delete materials if not used
    for material in bpy.data.materials:
        if utilities_color.material_prefix in material.name:
            if material.users == 0:
                material.user_clear()
                bpy.data.materials.remove(material)

    # Restore previous mode
    bpy.ops.object.mode_set(mode=previous_mode)


    for area in bpy.context.screen.areas:
        print("area: {}".format(area.type))
        if area.type == 'PROPERTIES':
            for space in area.spaces:
                if space.type == 'PROPERTIES':
                    # space.shading.type = 'MATERIAL'
                    space.context = 'MATERIAL'

    # Show Material Tab
    for area in bpy.context.screen.areas:
        if area.type == 'PROPERTIES':
            for space in area.spaces:
                if space.type == 'PROPERTIES':
                    space.context = 'MATERIAL'

    # Switch Solid shading
    for area in bpy.context.screen.areas:
        if area.type == 'VIEW_3D':
            for space in area.spaces:
                if space.type == 'VIEW_3D':
                    space.shading.type = 'SOLID'


bpy.utils.register_class(op)