Blender-TexTools/op_unwrap_faces_iron.py

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

from . import utilities_uv

class op(bpy.types.Operator):
    """UV Operator description"""
    bl_idname = "uv.textools_unwrap_faces_iron"
    bl_label = "Iron"
    bl_description = "Unwrap selected faces into a single UV island"
    bl_options = {'REGISTER', 'UNDO'}
    
    @classmethod
    def poll(cls, context):

        if not bpy.context.active_object:
            return False

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

        #Only in Edit mode
        if bpy.context.active_object.mode != 'EDIT':
            return False

        # Need view Face mode
        if tuple(bpy.context.scene.tool_settings.mesh_select_mode)[2] == False:
            return False
        #Only in UV editor mode
        # if bpy.context.area.type != 'IMAGE_EDITOR':
        #     return False

        #Requires UV map
        # if not bpy.context.object.data.uv_layers:
        #     return False

        # if bpy.context.scene.tool_settings.uv_select_mode != 'FACE':
        #      return False
        return True

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


def main(context):
    print("operatyor_faces_iron()")

    #Store selection
    utilities_uv.selection_store()

    bm = bmesh.from_edit_mesh(bpy.context.active_object.data)
    uv_layers = bm.loops.layers.uv.verify()

    bpy.context.scene.tool_settings.uv_select_mode = 'FACE'
    bpy.ops.mesh.mark_seam(clear=True)


    selected_faces = [f for f in bm.faces if f.select]

    # Hard edges to seams
    bpy.ops.mesh.select_mode(use_extend=False, use_expand=False, type='EDGE')
    bpy.ops.mesh.region_to_loop()
    bpy.ops.mesh.mark_seam(clear=False)

    bpy.ops.mesh.select_mode(use_extend=False, use_expand=False, type='FACE')
    for face in selected_faces:
        face.select = True
        
    bpy.ops.uv.unwrap(method='ANGLE_BASED', margin=0.0226216)

bpy.utils.register_class(op)