Hi all,

I'm facing a problem with Drag 'N Drop : I started my design using Fridge Magnets exemple. But now I'm trying to integrate the modified code to my main app. Thing is I can't drop my widget anymore. I suspect it has to do with the fact that I'm now trying to drag 'n drop my widgets on a QFrame, whereas on the Qt Exemple it doesn't go like that.

I've pasted some code :
Qt Code: 
  1. BeaconWidgetDrag::BeaconWidgetDrag(QWidget *parent)
  2.     : QWidget(parent)
  3. {
  4.     BeaconWidget * test;
  5.  
  6.     int x = 5;
  7.     int y = 5;
  8.  
  9.     test = new BeaconWidget("x01", BeaconStateDown, this);
  10.  
  11.     test->move(x, y);
  12.     test->show();
  13.     test->setAttribute(Qt::WA_DeleteOnClose);
  14.  
  15.     //setMinimumSize(400, qMax(200, y));
  16.     setAcceptDrops(true);
  17. }
  18.  
  19. BeaconWidgetDrag::~BeaconWidgetDrag()
  20. {
  21.  
  22. }
  23.  
  24. void BeaconWidgetDrag::dragEnterEvent(QDragEnterEvent *event)
  25. {
  26.     if (event->mimeData()->hasFormat("application/x-beaconwidget")) {
  27.         if (children().contains(event->source())) {
  28.             event->setDropAction(Qt::MoveAction);
  29.             event->accept();
  30.         } else {
  31.             event->acceptProposedAction();
  32.         }
  33.     } else if (event->mimeData()->hasText()) {
  34.         event->acceptProposedAction();
  35.     } else {
  36.         event->ignore();
  37.     }
  38. }
  39.  
  40. void BeaconWidgetDrag::dragMoveEvent(QDragMoveEvent *event)
  41. {
  42.     if (event->mimeData()->hasFormat("application/x-beaconwidget")) {
  43.         if (children().contains(event->source())) {
  44.             event->setDropAction(Qt::MoveAction);
  45.             event->accept();
  46.         } else {
  47.             event->acceptProposedAction();
  48.         }
  49.     } else if (event->mimeData()->hasText()) {
  50.         event->acceptProposedAction();
  51.     } else {
  52.         event->ignore();
  53.     }
  54. }
  55.  
  56. void BeaconWidgetDrag::dropEvent(QDropEvent *event)
  57. {
  58.     if (event->mimeData()->hasFormat("application/x-beaconwidget")) {
  59.         const QMimeData *mime = event->mimeData();
  60.         QByteArray itemData = mime->data("application/x-beaconwidget");
  61.         QDataStream dataStream(&itemData, QIODevice::ReadOnly);
  62.  
  63.         QString text;
  64.         QPoint offset;
  65.         dataStream >> text >> offset;
  66.         BeaconWidget * newBeacon = new BeaconWidget(text, BeaconStateDown, this);
  67.         newBeacon->move(event->pos() - offset);
  68.         newBeacon->show();
  69.         newBeacon->setAttribute(Qt::WA_DeleteOnClose);
  70.  
  71.         if (event->source() == this) {
  72.             event->setDropAction(Qt::MoveAction);
  73.             event->accept();
  74.         } else {
  75.             event->acceptProposedAction();
  76.         }
  77.     } else if (event->mimeData()->hasText()) {
  78.         QStringList pieces = event->mimeData()->text().split(QRegExp("\\s+"),
  79.                              QString::SkipEmptyParts);
  80.         QPoint position = event->pos();
  81.  
  82.         foreach (QString piece, pieces) {
  83.             BeaconWidget * newBeacon = new BeaconWidget(piece, BeaconStateDown, this);
  84.             newBeacon->move(position);
  85.             newBeacon->show();
  86.             newBeacon->setAttribute(Qt::WA_DeleteOnClose);
  87.  
  88.             position += QPoint(newBeacon->width(), 0);
  89.         }
  90.  
  91.         event->acceptProposedAction();
  92.     } else {
  93.         event->ignore();
  94.     }
  95. }
  96.  
  97. void BeaconWidgetDrag::mousePressEvent(QMouseEvent * event)
  98. {
  99.     BeaconWidget *child = static_cast<BeaconWidget *>(childAt(event->pos()));
  100.     if (!child)
  101.         return;
  102.  
  103.     QPoint hotSpot = event->pos() - child->pos();
  104.  
  105.     QByteArray itemData;
  106.     QDataStream dataStream(&itemData, QIODevice::WriteOnly);
  107.     dataStream << child->labelText() << QPoint(hotSpot);
  108.  
  109.     QMimeData *mimeData = new QMimeData;
  110.     mimeData->setData("application/x-beaconwidget", itemData);
  111.     mimeData->setText(child->labelText());
  112.  
  113.     QDrag *drag = new QDrag(this);
  114.     drag->setMimeData(mimeData);
  115.     drag->setPixmap(*child->pixmap());
  116.     drag->setHotSpot(hotSpot);
  117.  
  118.     child->hide();
  119.  
  120.     if (drag->exec(Qt::MoveAction | Qt::CopyAction, Qt::CopyAction) == Qt::MoveAction)
  121.         child->close();
  122.     else
  123.         child->show();
  124. }
  125.  
  126.  
  127. void BeaconWidgetDrag::Log(QString s)
  128. {
  129.     emit LogChanged(s);
  130. }
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My drag 'n drop widget is called that way, with ui->frame being a QFrame with setAcceptDrops = true
Qt Code: 
  1. void BeaconMonitor::on_tabWidget_tabBarDoubleClicked(int index)
  2. {
  3.     BeaconWidgetDrag * beaconWidgetDrag = new BeaconWidgetDrag(ui->frame);
  4.     beaconWidgetDrag->show();
  5. }
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I hope I have been clear enough.

Thanks for your help;