wm.py 文件源码

def execute(self, context):
        value = self.value
        data_path = self.data_path

        # match the pointer type from the target property to bpy.data.*
        # so we lookup the correct list.
        data_path_base, data_path_prop = data_path.rsplit(".", 1)
        data_prop_rna = eval("context.%s" % data_path_base).rna_type.properties[data_path_prop]
        data_prop_rna_type = data_prop_rna.fixed_type

        id_iter = None

        for prop in bpy.data.rna_type.properties:
            if prop.rna_type.identifier == "CollectionProperty":
                if prop.fixed_type == data_prop_rna_type:
                    id_iter = prop.identifier
                    break

        if id_iter:
            value_id = getattr(bpy.data, id_iter).get(value)
            exec("context.%s = value_id" % data_path)

        return operator_path_undo_return(context, data_path)