如何在QTabwidget中保存文件？

void MainWindow::saveFile()
{
    // 获取当前选中的标签页
    int currentIndex = tabWidget->currentIndex();
    QWidget* currentWidget = tabWidget->widget(currentIndex);

    // 获取用户选择的保存路径
    QString filePath = QFileDialog::getSaveFileName(this, tr("Save File"), "", tr("Text Files (*.txt);;All Files (*.*)"));

    // 执行文件保存操作
    QFile file(filePath);
    if (file.open(QIODevice::WriteOnly | QIODevice::Text)) {
        QTextStream stream(&file);
        // 根据当前标签页的类型，保存不同的内容
        if (currentWidget->inherits("QTextEdit")) {
            QTextEdit* textEdit = qobject_cast<QTextEdit*>(currentWidget);
            stream << textEdit->toPlainText();
        }
        else if (currentWidget->inherits("QPlainTextEdit")) {
            QPlainTextEdit* plainTextEdit = qobject_cast<QPlainTextEdit*>(currentWidget);
            stream << plainTextEdit->toPlainText();
        }
        file.close();
    }
}