import sys
from PySide6.QtWidgets import QApplication, QMainWindow, QMenu, QVBoxLayout, QWidget, QLineEdit
from PySide6.QtGui import QAction

class MyWindow(QMainWindow):
    def __init__(self):
        super().__init__()

        self.setWindowTitle("Menu Example")
        self.resize(800, 600)

        # Create a menu bar
        menu_bar = self.menuBar()

        # Create "File" menu
        file_menu = menu_bar.addMenu("File")

        # Create "Filter" action
        filter_action = QAction("Filter", self)
        filter_action.triggered.connect(self.show_text_boxes)
        file_menu.addAction(filter_action)

        # Create "Generate" action
        generate_action = QAction("Generate", self)
        file_menu.addAction(generate_action)

        # Create "Exit" action
        exit_action = QAction("Exit", self)
        exit_action.triggered.connect(self.close)
        menu_bar.addAction(exit_action)

        self.central_widget = QWidget()
        self.setCentralWidget(self.central_widget)
        self.layout = QVBoxLayout(self.central_widget)

    def show_text_boxes(self):
        self.clear_layout()
        
        content_textbox = QLineEdit(self)
        content_textbox.setPlaceholderText("Content")
        self.layout.addWidget(content_textbox)

        obj_textbox = QLineEdit(self)
        obj_textbox.setPlaceholderText("Obj")
        self.layout.addWidget(obj_textbox)

        tag_textbox = QLineEdit(self)
        tag_textbox.setPlaceholderText("Tag")
        self.layout.addWidget(tag_textbox)

    def clear_layout(self):
        for i in reversed(range(self.layout.count())):
            widget = self.layout.itemAt(i).widget()
            if widget is not None:
                widget.deleteLater()

if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = MyWindow()
    window.show()
    sys.exit(app.exec())