main.py

import sys
import platform
import serial.tools.list_ports
from PySide2 import QtCore, QtGui, QtWidgets
from PySide2.QtCore import (QCoreApplication, QPropertyAnimation, QDate, QDateTime,
                            QMetaObject, QObject, QPoint, QRect, QSize, QTime, QUrl, Qt, QEvent)
from PySide2.QtGui import (QBrush, QColor, QConicalGradient, QCursor, QFont, QFontDatabase,
                           QIcon, QKeySequence, QLinearGradient, QPalette, QPainter, QPixmap, QRadialGradient)
from PySide2.QtWidgets import *

# GUI FILE
from ui_serial import Ui_MainWindow

# IMPORT FUNCTIONS
from ui_functions import *


class MainWindow(QMainWindow):
    def __init__(self):
        QMainWindow.__init__(self)
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)

        # MOVE WINDOW
        def moveWindow(event):
            # RESTORE BEFORE MOVE
            if UIFunctions.returnStatus() == 1:
                UIFunctions.maximize_restore(self)

            # IF LEFT CLICK MOVE WINDOW
            if event.buttons() == Qt.LeftButton:
                self.move(self.pos() + event.globalPos() - self.dragPos)
                self.dragPos = event.globalPos()
                event.accept()

        # SET TITLE BAR
        self.ui.title_bar.mouseMoveEvent = moveWindow

        # ==> SET UI DEFINITIONS
        UIFunctions.uiDefinitions(self)

        # SHOW ==> MAIN WINDOW
        ########################################################################
        self.show()

    # APP EVENTS
    ########################################################################
    def mousePressEvent(self, event):
        self.dragPos = event.globalPos()


if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = MainWindow()
    sys.exit(app.exec_())