当我在QT中设置QInputDialog的密码时，如何设置背景不活动和灰显？

bool ok;
QString password = QInputDialog::getText(nullptr, "Password", "Enter password:", QLineEdit::Password, "", &ok);

QInputDialog dialog;
QLineEdit* passwordLineEdit = dialog.findChild<QLineEdit*>();

if (passwordLineEdit) {
    passwordLineEdit->setPlaceholderText("Password");
    passwordLineEdit->setStyleSheet("QLineEdit { color: gray; }");

    QObject::connect(passwordLineEdit, &QLineEdit::textChanged, [=]() {
        passwordLineEdit->setStyleSheet("QLineEdit { color: black; }");
    });
}

bool ok = dialog.exec();
QString password = passwordLineEdit->text();