Qt shortcut to hide QWidget

[Nyx]

Hi ,
I am looking how I could use a QShortcut to make my main QWidget appear and disappear. I tried this but it only hide the widget I can't show() it again by the same shortcut:

void ULmain::upShwHide()
{
    if(m_visible)
    {
        //this->QWidget::hide();
        setVisible(true);
        m_visible = false;
    }
    else
    {
        //this->QWidget::show();
        setVisible(true);
        m_visible = true;
    }
}

void ULmain::upShwHide()
{
    if(m_visible)
    {
        //this->QWidget::hide();
        setVisible(true);
        m_visible = false;
    }
    else
    {
        //this->QWidget::show();
        setVisible(true);
        m_visible = true;
    }
}

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I declared in my class constructor:

QShortcut * shwHide = new QShortcut(QKeySequence("Ctrl+Space"), this);

QShortcut * shwHide = new QShortcut(QKeySequence("Ctrl+Space"), this);

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and connect:

QObject::connect(shwHide, SIGNAL(activated()), this, SLOT(upShwHide()));

QObject::connect(shwHide, SIGNAL(activated()), this, SLOT(upShwHide()));

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I thought about a systemtray application but it doesn't seems to work.