Remove QListView background

Question

I want to remove the background of my QListView so that the background below can be seen through. How can I do that?

I tried setAttribute(Qt::WA_NoSystemBackground

Answer 1

The answer depends on whether your QListView is a top-level widget. The QWidget docs on transparency explain in detail. For a top-level widget, it may be as simple as:

view->setWindowOpacity(50);

For a widget that's not top level, you want to set the background to one with an alpha channel:

QPalette palette = view->palette();
palette.setColor(QPalette::Background, Qt::transparent);
view->setPalette(palette);

You should also be able to do the same thing with style sheets:

view->setStyleSheet("background-color: transparent;");

You may need to set autoFillBackground to false so that the widget will not automatically fill in the background.