main_window.py

# app\ui\main_window.py
from PyQt6.QtCore import Qt
from PyQt6.QtWidgets import QMainWindow, QWidget, QHBoxLayout, QTextEdit
from ..utils.config import AppConfig
from .widgets.menubar import MenuBar
from .widgets.toolbar import ToolBar
from .widgets.statusbar import StatusBar
from .widgets.treeview import TreeView


class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self) -> None:
        """
        Initialize the user interface.
        """
        # Window-Settings
        self.setWindowTitle(AppConfig.APP_NAME)
        self.setGeometry(100, 100, 800, 600)
        central_widget = QWidget(self)
        self.setCentralWidget(central_widget)

        layout = QHBoxLayout(central_widget)
        central_widget.setLayout(layout)

        # Create Widgets
        self.create_treeview()
        self.create_toolbars()
        self.create_edit()

        # Add Widgets to Window
        self.setMenuBar(MenuBar(self))
        self.setStatusBar(StatusBar(self))

        layout.addWidget(self.treeview)
        layout.addWidget(self.editbox, stretch=1)
        layout.addWidget(self.editbox)

    def create_toolbars(self):
        '''
        Top Toolbar [PyQt6.QtWidgets.QToolBar]
        '''
        self.topbar = ToolBar(self,
                              orientation=Qt.Orientation.Horizontal,
                              style=Qt.ToolButtonStyle.ToolButtonTextUnderIcon,
                              icon_size=(24, 24))

        # Top Toolbar Buttons
        self.topbar.add_button("Open", "resources/assets/icons/windows/imageres-10.ico", self.open_file)
        self.topbar.add_button("Save", "resources/assets/icons/windows/shell32-259.ico", self.save_file)
        self.topbar.add_separator()
        self.topbar.add_button("Exit", "resources/assets/icons/windows/shell32-220.ico", self.exit_app)
        '''
        Right Toolbar [PyQt6.QtWidgets.QToolBar]
        '''
        self.rightbar = ToolBar(self,
                                orientation=Qt.Orientation.Vertical,
                                style=Qt.ToolButtonStyle.ToolButtonIconOnly,
                                icon_size=(24, 24))

        # Right Toolbar Buttons
        self.rightbar.add_separator()
        self.rightbar.add_button("Privacy", "resources/assets/icons/windows/shell32-167.ico", self.privacy_window)
        self.rightbar.add_button("Settings", "resources/assets/icons/windows/shell32-315.ico", self.settings_window)

        self.addToolBar(Qt.ToolBarArea.TopToolBarArea, self.topbar)
        self.addToolBar(Qt.ToolBarArea.RightToolBarArea, self.rightbar)

    def create_treeview(self):
        self.treeview = TreeView(self)

    def create_edit(self):
        # Add multiline text field (QTextEdit)
        self.editbox = QTextEdit(self)

    def open_file(self) -> None:
        print("Open")

    def save_file(self) -> None:
        print("Save")

    def exit_app(self) -> None:
        self.close()

    def settings_window(self) -> None:
        print("settings_window")

    def privacy_window(self) -> None:
        print("privacy_window")