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qt4-doc-4.6.3-0.2mdv2010.2.i586.rpm

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 #include &lt;QtGui&gt;

 #include &quot;draglabel.h&quot;
 #include &quot;dragwidget.h&quot;

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

     int x = 5;
     int y = 5;

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

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

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

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

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

         QList&lt;QByteArray&gt; hotSpotPos = mime-&gt;data(&quot;application/x-hotspot&quot;).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-&gt;move(position - hotSpot);
             newLabel-&gt;show();
             newLabel-&gt;setAttribute(Qt::WA_DeleteOnClose);

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

         if (event-&gt;source() == this) {
             event-&gt;setDropAction(Qt::MoveAction);
             event-&gt;accept();
         } else {
             event-&gt;acceptProposedAction();
         }
     } else {
         event-&gt;ignore();
     }
     foreach (QObject *child, children()) {
         if (child-&gt;inherits(&quot;QWidget&quot;)) {
             QWidget *widget = static_cast&lt;QWidget *&gt;(child);
             if (!widget-&gt;isVisible())
                 widget-&gt;deleteLater();
         }
     }
 }

 void DragWidget::mousePressEvent(QMouseEvent *event)
 {
     QLabel *child = static_cast&lt;QLabel*&gt;(childAt(event-&gt;pos()));
     if (!child)
         return;

     QPoint hotSpot = event-&gt;pos() - child-&gt;pos();

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

     QPixmap pixmap(child-&gt;size());
     child-&gt;render(&amp;pixmap);

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

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

     if (dropAction == Qt::MoveAction)
         child-&gt;close();
 }</pre>
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