hallo

from PyQt5.QtWidgets import QApplication, QMainWindow, QLabel, QGridLayout, QWidget, QCheckBox, QSystemTrayIcon, \
        QSpacerItem, QSizePolicy, QMenu, QAction, QStyle, qApp
from PyQt5.QtCore import QSize
     
     
class MainWindow(QMainWindow):
    """
        Сheckbox and system tray icons.
        Will initialize in the constructor.
    """
    check_box = None
    tray_icon = None
     
    # Override the class constructor
    def __init__(self):
        # Be sure to call the super class method
        QMainWindow.__init__(self)
     
        self.setMinimumSize(QSize(480, 80))             # Set sizes
        self.setWindowTitle("System Tray Application")  # Set a title
        central_widget = QWidget(self)                  # Create a central widget
        self.setCentralWidget(central_widget)           # Set the central widget
     
        grid_layout = QGridLayout(self)         # Create a QGridLayout
        central_widget.setLayout(grid_layout)   # Set the layout into the central widget
        grid_layout.addWidget(QLabel("Application, which can minimize to Tray", self), 0, 0)
     
        # Add a checkbox, which will depend on the behavior of the program when the window is closed
        self.check_box = QCheckBox('Minimize to Tray')
        grid_layout.addWidget(self.check_box, 1, 0)
        grid_layout.addItem(QSpacerItem(0, 0, QSizePolicy.Expanding, QSizePolicy.Expanding), 2, 0)
     
        # Init QSystemTrayIcon
        self.tray_icon = QSystemTrayIcon(self)
        self.tray_icon.setIcon(self.style().standardIcon(QStyle.SP_ComputerIcon))
     
        '''
        Define and add steps to work with the system tray icon
        show - show window
        hide - hide window
        exit - exit from application
        '''
        show_action = QAction("Show", self)
        quit_action = QAction("Exit", self)
        hide_action = QAction("Hide", self)
        show_action.triggered.connect(self.show)
        hide_action.triggered.connect(self.hide)
        quit_action.triggered.connect(qApp.quit)
        tray_menu = QMenu()
        tray_menu.addAction(show_action)
        tray_menu.addAction(hide_action)
        tray_menu.addAction(quit_action)
        self.tray_icon.setContextMenu(tray_menu)
        self.tray_icon.show()
     
        # Override closeEvent, to intercept the window closing event
        # The window will be closed only if there is no check mark in the check box
        def closeEvent(self, event):
            if self.check_box.isChecked():
                event.ignore()
                self.hide()
                self.tray_icon.showMessage(
                    "Tray Program",
                    "Application was minimized to Tray",
                    QSystemTrayIcon.Information,
                    2000
                    )
     
     
if __name__ == "__main__":
    import sys
     
    app = QApplication(sys.argv)
    mw = MainWindow()
    mw.show()
    sys.exit(app.exec())

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