how to maximaize the label by using mouse click?

[iswaryasenthilkumar]

now my label was in fullsize

label->showFullScreen();

label->showFullScreen();

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while at runtime when am click mouse either left or right button the label should maximized,my code below

void Widget::mousePressEvent(QMouseEvent *event)
{
    if(event->button()==Qt::LeftButton || Qt::RightButton)
    {
       label->showMaximized();
       label->activateWindow();
       label->update();
 
    }
}

void Widget::mousePressEvent(QMouseEvent *event)
{
    if(event->button()==Qt::LeftButton || Qt::RightButton)
    {
       label->showMaximized();
       label->activateWindow();
       label->update();

    }
}

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this mousepressevent code not working..what am doing wrong?? please give me suggestion for this
Thanks in advance