C++/QT window top placement and transparency issues

Insert code with code block function, do not paste screenshot. Answer rate decreased by 50% without using code blocks

void CodeBook::on_setTopHint() {
    if (!isWidTop) {
        QWindow* pWin = this->windowHandle();
        pWin->setFlags(Qt::Widget | Qt::WindowStaysOnTopHint);
        this->setAttribute(Qt::WA_TranslucentBackground, true);
        cbWid->setBtnLockState(true);
        qDebug() << u8"CodeBook001: 切换窗口为最顶层";
    }else {
        QWindow* pWin = this->windowHandle();
        pWin->setFlags(Qt::Widget);
        this->setAttribute(Qt::WA_TranslucentBackground, true);
        cbWid->setBtnLockState(false);
        this->show();
        qDebug() << u8"CodeBook001: 取消窗口为最顶层";
    }
    isWidTop = !isWidTop;
}

Running result and detailed error content

As shown in the figure, after clicking the top button, the window is placed on top but the background is no longer transparent:

My answer ideas and tried methods, and those who don't write their own ideas, the answer rate drops by 60%

tried to solve with the following code, but did not achieve the desired effect:

this->setWindowFlags(Qt::WindowStaysOnTopHint);
this->setWindowFlags(Qt::FramelessWindowHint | Qt::WindowMinMaxButtonsHint);
this->setAttribute(Qt::WA_TranslucentBackground, true);
this->show();

The result I want to achieve, if you need a quick answer, please try "paid reward"