CODEWITHSUNDEEP
qtmenupopupqmenu
user1703711
user1703711

Reputation: 123

Qt: QMenu with translucent background

I use Windows and I want to set a style sheet to a QMenu to give it a translucent background. In order for that to work, I first set the FramelessWindowHint, then I set the WA_TranslucentBackground attribute. Then I set my style sheet and display the menu with the popup method. It is drawn correctly, but it behaves strangely: As soon as it has the FramelessWindowHint, it is always visible (even before calling the popup() method). It does not hide itself anymore after one of its entries has been clicked.

Here is a minimalistic example:

#include <QApplication>
#include <QMenu>
#include <QPoint>
#include <QCursor>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QMenu menu;
    menu.addAction("about", &a, SLOT(aboutQt()));
    menu.addAction("exit", &a, SLOT(quit()));
    menu.setWindowFlags(Qt::FramelessWindowHint);
    menu.setAttribute(Qt::WA_TranslucentBackground);
    menu.setStyleSheet("QMenu{background:rgba(255, 0, 0, 50%);}");
    menu.popup(QCursor::pos());
    return a.exec();
}

Upvotes: 4

Views: 3174

Answers (1)

Dmitry Melnikov
Dmitry Melnikov

Reputation: 743

menu.setWindowFlags(menu.windowFlags() | Qt::FramelessWindowHint);

should solve your problem. Now you are clearing all flags already set by Qt.

Upvotes: 2

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