def close_all_files(self, leave_first_editor=True):
        """
        Closes every opened files and removes their associated **Script_Editor_tabWidget** Widget tabs.

        :return: Method success.
        :rtype: bool
        """

        # self.__engine.start_processing("Closing All Files ...", len(self.list_editors()))
        success = True
        for file in self.list_files():
            success *= True if self.close_file(file, leave_first_editor) else False
            if not success:
                break

                # self.__engine.step_processing()
        # self.__engine.stop_processing()
        return success