我想点击QListView“widget_list_files”中的一个项目（这是一个pdf的文件路径），并更新QWebEngineView“视图”以显示pdf。如果我将所有内容放在同一个www.example.com中，它会正常工作app.py，但如果我将其移动到一个单独的文件中并导入类，QListView会被填充，但点击事件会被忽略。一个有趣的行为是，如果设置一些断点并启动vscode调试，它也可以与导入O.o
app.py

from modm.functions.cms import cms

class MainWindow(QMainWindow):

    def __init__(self):
        super(MainWindow, self).__init__()

        self.file_path = '/home/user/Downloads'

        layout_cms = QHBoxLayout()

        # Files Layout
        layout_files = QVBoxLayout()

        layout_files_search = QHBoxLayout()

        search_input_text = QLineEdit()
        search_input_text.setMaxLength(10)
        search_input_text.setPlaceholderText("Enter your text")
        layout_files_search.addWidget(search_input_text)

        search_button_search = QPushButton("Search")
        layout_files_search.addWidget(search_button_search)

        self.widget_list_files = QListView()
        self.widget_list_files.clicked.connect(self.open_document)
        self.model_files = QFileSystemModel()
        self.model_files.setNameFilterDisables(False)
        self.model_files.setFilter(QDir.Files)
        self.model_files.setNameFilters(["*.pdf"])

        layout_files.addLayout(layout_files_search)
        layout_files.addWidget(self.widget_list_files)

        layout_cms.addLayout( layout_files,stretch=2)

        # Document Layout
        self.view = QWebEngineView()
        self.view.settings().setAttribute(QWebEngineSettings.PluginsEnabled, True)
        self.view.settings().setAttribute(QWebEngineSettings.PdfViewerEnabled, True)
        layout_document = QVBoxLayout()
        layout_document.addWidget(self.view)

        # Document Layout -> buttons
        layout_document_buttons = QHBoxLayout()
        document_button_merge = QPushButton("Merge")
        layout_document_buttons.addWidget(document_button_merge)

        layout_document.addLayout(layout_document_buttons)
        layout_cms.addLayout(layout_document,stretch=3)

        self.model_files.setRootPath(self.file_path)
        self.widget_list_files.setModel(self.model_files)
        self.widget_list_files.setRootIndex(self.model_files.index(self.file_path))
        self.widget_cms = QWidget()
        self.widget_cms.setLayout(layout_cms)

        content_cms = cms()
        # Tab Menu
        tab_menu = QTabWidget()
        tab_menu.setTabPosition(QTabWidget.West)
        tab_menu.setMovable(True)
        # here I use the imported version
        tab_menu.addTab(content_cms.widget_cms, 'CMS')
        # here I use code from this file
        tab_menu.addTab(self.widget_cms, 'Merge')
        self.setCentralWidget(tab_menu)

    def open_document(self,index):
        self.view.setUrl(f"file://{self.model_files.filePath(index)}")
def run():
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()

    app.exec()

if __name__ == '__main__':
    run()

cms.py

class cms():

    def __init__(self):
        self.file_path = '/home/user/Downloads'

        layout_cms = QHBoxLayout()

        # Files Layout
        layout_files = QVBoxLayout()

        layout_files_search = QHBoxLayout()

        search_input_text = QLineEdit()
        search_input_text.setMaxLength(10)
        search_input_text.setPlaceholderText("Enter your text")
        layout_files_search.addWidget(search_input_text)

        search_button_search = QPushButton("Search")
        layout_files_search.addWidget(search_button_search)

        self.widget_list_files = QListView()
        self.widget_list_files.clicked.connect(self.open_document)
        self.model_files = QFileSystemModel()
        self.model_files.setNameFilterDisables(False)
        self.model_files.setFilter(QDir.Files)
        self.model_files.setNameFilters(["*.pdf"])

        layout_files.addLayout(layout_files_search)
        layout_files.addWidget(self.widget_list_files)

        layout_cms.addLayout( layout_files,stretch=2)

        # Document Layout
        self.view = QWebEngineView()
        self.view.settings().setAttribute(QWebEngineSettings.PluginsEnabled, True)
        self.view.settings().setAttribute(QWebEngineSettings.PdfViewerEnabled, True)
        layout_document = QVBoxLayout()
        layout_document.addWidget(self.view)

        # Document Layout -> buttons
        layout_document_buttons = QHBoxLayout()
        document_button_merge = QPushButton("Merge")

        layout_document.addLayout(layout_document_buttons)
        layout_cms.addLayout(layout_document,stretch=3)

        self.model_files.setRootPath(self.file_path)
        self.widget_list_files.setModel(self.model_files)
        self.widget_list_files.setRootIndex(self.model_files.index(self.file_path))
        self.widget_cms = QWidget()
        self.widget_cms.setLayout(layout_cms)

    def open_document(self,index):
        # if I set the breakpointn in the line below and randomly somewhere in __init__ it also works in this version in debug mode
        self.view.setUrl(f"file://{self.model_files.filePath(index)}")

我将完全相同的代码从www.example.com移动app.py到cms.py，我希望它能像在www.example.com中一样工作app.py，这意味着PDF文件（QListView“widget_list_files”中的一个项目）将显示在QWebEngineView“视图”中。