QDrag - Change the image display while dragging

[chkong]

I started a drag with image.

QDrag* drag = new(QDrag)(this);
drag->setPixmap(*pixmap);
drag->exec(Qt::CopyAction | Qt::MoveAction);

QDrag* drag = new(QDrag)(this);
drag->setPixmap(*pixmap);
drag->exec(Qt::CopyAction | Qt::MoveAction);

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I want to change the image display when my drag reach certain point in the widget. Is there anyway to retrieve the drag object so that I could change the image?