Qt：实现顶层窗体圆角_qt 圆角窗口弹窗-CSDN博客 

    setWindowFlags(Qt::FramelessWindowHint);QBitmap bmp(this->size());bmp.fill();QPainter p(&bmp);p.setPen(Qt::NoPen);p.setBrush(Qt::black);p.setRenderHint(QPainter::Antialiasing);p.drawRoundedRect(bmp.rect(), 15, 15); //四个角都是圆弧setMask(bmp);