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draglabel.cpp Example File
draganddrop/draggabletext/draglabel.cpp

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 #include <QtGui>

 #include "draglabel.h"

 DragLabel::DragLabel(const QString &text, QWidget *parent)
     : QLabel(text, parent)
 {
     setAutoFillBackground(true);
     setFrameShape(QFrame::Panel);
     setFrameShadow(QFrame::Raised);
 }

 void DragLabel::mousePressEvent(QMouseEvent *event)
 {
     QPoint hotSpot = event->pos();

     QMimeData *mimeData = new QMimeData;
     mimeData->setText(text());
     mimeData->setData("application/x-hotspot",
                       QByteArray::number(hotSpot.x())
                       + " " + QByteArray::number(hotSpot.y()));

     QPixmap pixmap(size());
     render(&pixmap);

     QDrag *drag = new QDrag(this);
     drag->setMimeData(mimeData);
     drag->setPixmap(pixmap);
     drag->setHotSpot(hotSpot);

     Qt::DropAction dropAction = drag->exec(Qt::CopyAction | Qt::MoveAction, Qt::CopyAction);

     if (dropAction == Qt::MoveAction) {
         close();
         update();
     }
 }