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dragwidget.cpp Example File
draganddrop/draggabletext/dragwidget.cpp

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 #include <QtGui>

 #include "draglabel.h"
 #include "dragwidget.h"

 DragWidget::DragWidget(QWidget *parent)
     : QWidget(parent)
 {
     QFile dictionaryFile(":/dictionary/words.txt");
     dictionaryFile.open(QIODevice::ReadOnly);
     QTextStream inputStream(&dictionaryFile);

     int x = 5;
     int y = 5;

     while (!inputStream.atEnd()) {
         QString word;
         inputStream >> word;
         if (!word.isEmpty()) {
             DragLabel *wordLabel = new DragLabel(word, this);
             wordLabel->move(x, y);
             wordLabel->show();
             x += wordLabel->width() + 2;
             if (x >= 195) {
                 x = 5;
                 y += wordLabel->height() + 2;
             }
         }
     }

     QPalette newPalette = palette();
     newPalette.setColor(QPalette::Window, Qt::white);
     setPalette(newPalette);

     setAcceptDrops(true);
     setMinimumSize(400, qMax(200, y));
     setWindowTitle(tr("Draggable Text"));
 }

 void DragWidget::dragEnterEvent(QDragEnterEvent *event)
 {
     if (event->mimeData()->hasText()) {
         if (children().contains(event->source())) {
             event->setDropAction(Qt::MoveAction);
             event->accept();
         } else {
             event->acceptProposedAction();
         }
     } else {
         event->ignore();
     }
 }

 void DragWidget::dropEvent(QDropEvent *event)
 {
     if (event->mimeData()->hasText()) {
         const QMimeData *mime = event->mimeData();
         QStringList pieces = mime->text().split(QRegExp("\\s+"),
                              QString::SkipEmptyParts);
         QPoint position = event->pos();
         QPoint hotSpot;

         QList<QByteArray> hotSpotPos = mime->data("application/x-hotspot").split(' ');
         if (hotSpotPos.size() == 2) {
             hotSpot.setX(hotSpotPos.first().toInt());
             hotSpot.setY(hotSpotPos.last().toInt());
         }

         foreach (QString piece, pieces) {
             DragLabel *newLabel = new DragLabel(piece, this);
             newLabel->move(position - hotSpot);
             newLabel->show();

             position += QPoint(newLabel->width(), 0);
         }

         if (children().contains(event->source())) {
             event->setDropAction(Qt::MoveAction);
             event->accept();
         } else {
             event->acceptProposedAction();
         }
     } else {
         event->ignore();
     }
 }