Show window in Qt without stealing focus

Question

I\'m using the Qt library to show a slideshow on the second monitor when the user isn\'t using the second monitor. An example is the user playing a game in the first monitor

Answer 1

If you want to make floating preview box/ any other widget just use below

thumbnail = new QLabel;
thumbnail->setAttribute(Qt::WA_ShowWithoutActivating);
thumbnail->setParent(0);
thumbnail->setWindowFlags(Qt::Tool | Qt::FramelessWindowHint|Qt::WindowStaysOnTopHint);

Qt::Tool is important flag to make it work. I mean not stealing focus.