Why QGraphicsItem moveing is valid in half?

[litterflybug]

Hello everyone
i subclass QGraphicsItem, in constractor,i add QGraphicsPixmapItem,and a
QGraphicsTextItem. When drag this item
Why drag is an effective second half, while the upper part of the void?

this is my code :

YPhoto::YPhoto(QPixmap&pix,QString&info,QGraphicsItem * parent)
:QGraphicsItem(parent)
{
  photo=new QGraphicsPixmapItem(this);
  photo->setPixmap(pix);
  baget=new QGraphicsTextItem(this);
  //name=new QGraphicsTextItem(this);
  //email=new QGraphicsTextItem(this);
 
  QTextDocument*    document=new QTextDocument(info);
  baget->setDocument(document);
  QRect rect=photo->pixmap().rect();
  baget->setTextWidth(rect.width());
  baget->setPos(this->pos().x(),this->pos().y()+rect.height());
 
}
 
QRectF YPhoto::boundingRect() const
{
	QRect rect=photo->pixmap().rect();
	QFontMetrics fm(baget->font());
 
	rect.setHeight(rect.height()+fm.height());
	return QRectF(rect);
}
 
QPainterPath YPhoto::shape() const
{
	QPainterPath path;
   QRect rect=photo->pixmap().rect();
   path.addRect(rect);
   path.addPath(baget->shape());
	return path;
}
 
void YPhoto::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
	painter->drawPixmap(option->exposedRect,photo->pixmap(),option->exposedRect);
}

YPhoto::YPhoto(QPixmap&pix,QString&info,QGraphicsItem * parent)
:QGraphicsItem(parent)
{
  photo=new QGraphicsPixmapItem(this);
  photo->setPixmap(pix);
  baget=new QGraphicsTextItem(this);
  //name=new QGraphicsTextItem(this);
  //email=new QGraphicsTextItem(this);

  QTextDocument*    document=new QTextDocument(info);
  baget->setDocument(document);
  QRect rect=photo->pixmap().rect();
  baget->setTextWidth(rect.width());
  baget->setPos(this->pos().x(),this->pos().y()+rect.height());

}

QRectF YPhoto::boundingRect() const
{
	QRect rect=photo->pixmap().rect();
	QFontMetrics fm(baget->font());

	rect.setHeight(rect.height()+fm.height());
	return QRectF(rect);
}

QPainterPath YPhoto::shape() const
{
	QPainterPath path;
   QRect rect=photo->pixmap().rect();
   path.addRect(rect);
   path.addPath(baget->shape());
	return path;
}

void YPhoto::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
	painter->drawPixmap(option->exposedRect,photo->pixmap(),option->exposedRect);
}

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