QMainWindow Opacity

[Henry Blue Heeler]

Changing a QMaindow's opacity doesn't seem to work whether changing the windowOpacity in Designer or by

AboutWin::AboutWin(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::AboutWin)
{
    ui->setupUi(this);
    setAttribute(Qt::WA_DeleteOnClose);
 
   this->setWindowOpacity(0.3);
 
}

AboutWin::AboutWin(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::AboutWin)
{
    ui->setupUi(this);
    setAttribute(Qt::WA_DeleteOnClose);

   this->setWindowOpacity(0.3);

}

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