Here is a list of all files with brief descriptions:

[detail level 1234]

Source
Controller
__init__.py	Exposes some parts of this python package for public usage
about_dialog.py	Create about dialog
help_dialog.py	Create help dialog
main_window.py	View controller for the main window
report_dialog.py	Create report dialog
splash_screen.py	Create splash screen
Model
__init__.py	Exposes some parts of this python package for public usage
authentication.py	User authentication
calculator.py	Calculator of items
config.py	Configuration settings
day_light.py	Get day light status for automatic theme
language.py	Supported languages and widget text translation
model.py	Application data storage model
monitor.py	Handle windows size and scale factor and update items
report.py	Read and write print log data and create report
sound.py	Sound module
update_service.py	Check for newer tool version
Util
__init__.py	Exposes some parts of this python package for public usage
app_data.py	Data module (path related constants and functions)
app_err_handler.py	Error handler to catch all unexpected exceptions to prevent application crashes
app_log.py	Logging class to store and manage log configuration
colored_log.py	Logging formatter for colored log in terminal
gui_toolkit.py	Individual GUI toolkit function and selection
openpyxl_util.py	Util function for openpyxl
Views
dialogs
dialog_about_ui.py
dialog_article_size_ui.py
dialog_help_ui.py
dialog_report_ui.py
dialog_splash_ui.py
mainwindow_ui.py
Worker
__init__.py	Exposes some parts of this python package for public usage
open_notepad.py	Open notepad file in thread to prevent freeze of window
printer.py	Create bon text and send to printer
__init__.py	Exposes some parts of this python package for public usage
app.py	Application entry file
version.py	Version and general information