Reimplement of resizeEvent

[Shawn]

what I want: show image at the central of the QMainwindow(centralWidget)
but after resizing, the image is still at the previous position

my code is like this:

SLD::SLD(QWidget *parent, Qt::WFlags flags)
	: QMainWindow(parent, flags)
{
	ui.setupUi(this);
}
 
void SLD::showCB(int x, int y, int w, int h)
{
	label=new QLabel(ui.centralWidget);
	label->setGeometry(x,y,w,h);
	label->setPixmap(QPixmap("Resources/CB.bmp"));
}
 
void SLD::resizeEvent(QResizeEvent * /* event */)
{
	mWidth = width();
	showCB((mWidth-50)/2,0,100,50);
}

SLD::SLD(QWidget *parent, Qt::WFlags flags)
	: QMainWindow(parent, flags)
{
	ui.setupUi(this);
}

void SLD::showCB(int x, int y, int w, int h)
{
	label=new QLabel(ui.centralWidget);
	label->setGeometry(x,y,w,h);
	label->setPixmap(QPixmap("Resources/CB.bmp"));
}

void SLD::resizeEvent(QResizeEvent * /* event */)
{
	mWidth = width();
	showCB((mWidth-50)/2,0,100,50);
}

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please help me.