Translucent the toolbar in the uppler level of QWidget::winId() - how?

[Jason]

Just try this code if it works -

QLabel *label = new QLabel();
    label->setFixedSize(400,300);
    label->setPixmap(QPixmap("some_pic.JPG").scaled(label->size()));
 
    QToolBar *tb = new QToolBar(label);
    tb->setStyleSheet("background-color : transparent ; color:white;");
    tb->addAction("Action 1");
    tb->addAction("Action 2");
    tb->addAction("Action 3");
    tb->resize(label->width(),tb->height());
 
    QVBoxLayout *layout = new QVBoxLayout(this);
    layout->addWidget(label);

QLabel *label = new QLabel();
    label->setFixedSize(400,300);
    label->setPixmap(QPixmap("some_pic.JPG").scaled(label->size()));

    QToolBar *tb = new QToolBar(label);
    tb->setStyleSheet("background-color : transparent ; color:white;");
    tb->addAction("Action 1");
    tb->addAction("Action 2");
    tb->addAction("Action 3");
    tb->resize(label->width(),tb->height());

    QVBoxLayout *layout = new QVBoxLayout(this);
    layout->addWidget(label);

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Put it in ctor of your custom widget.

You can also replace the stylesheet line with this one -

tb->setStyleSheet("QToolBar { background-color : rgba(200,0,0,100) ; color:white; border-color: transparent;}  QToolButton{background-color : transparent;} ");

tb->setStyleSheet("QToolBar { background-color : rgba(200,0,0,100) ; color:white; border-color: transparent;}  QToolButton{background-color : transparent;} ");

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Sorry, it still failed!
I doubt its the display difference between QLabel::winId and QLabel. I don't know the display mechanism of them......