Help me ,about the QGraphicsView ,it flicker always in my aplication

[A Former User]

here is my code:
@
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent)
{
resize(1000,500);
//body
QGraphicsView *pBody = new QGraphicsView(this);

QGraphicsScene *pSBody = new QGraphicsScene();


pSBody->setSceneRect(0,0,800,400);

pBody->setScene(pSBody);

pBody->setGeometry(QRect(100,50,800,400));



pBody->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

pBody->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

//无边框设置
pBody->setFrameShape(QFrame::NoFrame);


//设置背景透明
pBody->setBackgroundRole(QPalette::Background);

pBody->setPalette(QPalette(QColor(255,0,0,0)));


pBody->setStyleSheet(QString("QGraphicsView{background-color:#66cc33;}"));



QGraphicsProxyWidget *pDivProxy = new QGraphicsProxyWidget();

pDivProxy->setParent(this);

QGraphicsView *pDiv = new QGraphicsView();

QGraphicsScene *pSDiv = new QGraphicsScene();

pSDiv->setSceneRect(0,0,600,200);

pDiv->setScene(pSDiv);

pDiv->resize(600,200);

pDiv->setGeometry(QRect(100,100,600,200));

pDiv->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

pDiv->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

pDiv->setStyleSheet(QString("QGraphicsView{background-color:#22ccFF;}"));


pDivProxy->setGeometry(QRect(100,100,600,200));

pDivProxy->setPos(100.0,100.0);

pDivProxy->setWidget(pDiv);

pSBody->addItem(pDivProxy);

QGraphicsProxyWidget *pNumProxy = new QGraphicsProxyWidget();

QGraphicsProxyWidget *pPowProxy = new QGraphicsProxyWidget();

QGraphicsProxyWidget *pSumProxy = new QGraphicsProxyWidget();


QLineEdit *pNum = new QLineEdit();

QLineEdit *pPow = new QLineEdit();

QLineEdit *pSum = new QLineEdit();


pNumProxy->setWidget(pNum);

pPowProxy->setWidget(pPow);

pSumProxy->setWidget(pSum);



pNumProxy->setGeometry(QRect(20,20,100,30));

pPowProxy->setGeometry(QRect(20,60,100,30));

pSumProxy->setGeometry(QRect(150,60,80,60));


pNumProxy->setParent(this);

pPowProxy->setParent(this);

pSumProxy->setParent(this);



pSDiv->addItem(pNumProxy);

pSDiv->addItem(pPowProxy);

pSDiv->addItem(pSumProxy);

}@

what is the flicker reason for the code aboved

[Edit: Please wrap code in @ tags for proper formatting. -- mlong]

[A Former User]

Are u using qt4?