PyQt5 Menubar Example Mar 13th 2021 Words: 267

Screenshot

Code

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from functools import partial

from PyQt5.QtCore import QCoreApplication
from PyQt5.QtWidgets import QMainWindow, QStatusBar, QMenuBar, QActionGroup

from AboutWindow import AboutWindow


class MainWindow(QMainWindow):

    def __init__(self, *args, **kwargs):
        super(MainWindow, self).__init__(*args, **kwargs)
        self.setWindowTitle("My App")

        # Toolbar
        menu_bar = QMenuBar()

        # Menu
        menu_menu = menu_bar.addMenu("Menu")

        ## Import
        action_import = menu_menu.addAction("Import data")
        action_import.setStatusTip("Import data from file")
        action_import.triggered.connect(self.on_action_import_click)

        ## Export
        action_export = menu_menu.addAction("Export data")
        action_export.setStatusTip("Export data to file")
        action_export.triggered.connect(self.on_action_export_click)

        ## Exit
        action_exit = menu_menu.addAction("Exit")
        action_exit.setStatusTip("Exit the app")
        action_exit.triggered.connect(self.on_action_exit_click)

        # Settings
        menu_settings = menu_bar.addMenu("Settings")

        ## Language
        menu_settings_lang = menu_settings.addMenu("Language")

        action_group_lang = QActionGroup(self)
        action_group_lang.setExclusive(True)

        lang_list = [
            ("English (US)", "en_us"),
            ("中文（简体）", "zh_cn")
        ]
        for lang_name, lang_code in lang_list:
            action_lan_item = menu_settings_lang.addAction(lang_name)
            action_lan_item.setCheckable(True)
            action_lan_item.setActionGroup(action_group_lang)
            action_lan_item.triggered.connect(partial(self.on_action_lang_select, lang_code))

        # About
        self.window_about = AboutWindow(self)
        action_about = menu_bar.addAction("About")
        action_about.setStatusTip("About this application")
        action_about.triggered.connect(self.on_action_about_click)

        self.setMenuBar(menu_bar)

        # Status bar
        self.setStatusBar(QStatusBar(self))

    def on_action_import_click(self):
        pass # TODO

    def on_action_export_click(self):
        pass # TODO

    def on_action_about_click(self):
        self.window_about.show()

    def on_action_exit_click(self):
        QCoreApplication.quit()

    def on_action_lang_select(self, lang_code: str):
        print(lang_code)  # TODO

Note

To create the mutally exclusive options (eg. language selection), first create a QActionGroup and setExclusive(True), then set group for the QActions and add those QActions to a QMenu. QActionGroup does not need to be attached to anything.