Hello everyone,

I have made a chessgame, now I wanted to create a GUI for it, using model-view.
Every time I click a chesspiece (to dragn and drop) I want to store the original location of the DnDPixmap into 2 variables, so I still have the original location when I drop my chesspiece.
Then I can use those x and y values to see if the move is possible using my normal c++code.
The problem is, when I drag the adress of the DnDPixmap I hold seems to change, at least that's what my messageboxes are saying.

Qt Code: 
  1. DnDPixmap::DnDPixmap(const QPixmap &pixmap, uitzicht* a)
  3. {
  4.     // Make sure we allow drops.
  5.     setAcceptDrops(true);
  6.     connect(this, SIGNAL(moveMade( int, int, int, int)), a, SLOT(myslot( int, int, int, int)));
  7.  
  8. }
  9.  
  10.  
  11. void DnDPixmap::mousePressEvent(QGraphicsSceneMouseEvent* event)
  12. {
  13.  
  14.  
  15.     // We need to overload this method to make sure that
  16.     // nothing happens on a mouse press (e.g. select, move).
  17.     //
  18.     // This causes e.g. setFlag(QGraphicsItem::ItemIsMovable)
  19.     // to stop working, since flags modifies the mousePressEvent
  20.     // method of the base class, which is not called anymore now.
  21.     if (event->button() != Qt::LeftButton) {
  22.         event->ignore();
  23.         return;
  24.     }
  25. }
  26.  
  27. void DnDPixmap::mouseMoveEvent(QGraphicsSceneMouseEvent* event)
  28. {
  29.     // Check if move distance is above standard treshold.
  30.     if (QLineF(event->screenPos(), event->buttonDownScreenPos(Qt::LeftButton))
  31.         .length() < QApplication::startDragDistance())
  32.     {
  33.         return;
  34.     }
  35.  
  36.  
  37.  
  38.  
  39.     this->oudeX = event->lastScenePos().rx()/50;
  40.     this->oudeY = event->lastScenePos().ry()/50;
  41.  
  42.     // Create a drag object with mimetype data.
  43.     QDrag *drag = new QDrag(event->widget());
  44.     QMimeData *mime = new QMimeData;
  45.     drag->setMimeData(mime);
  46.  
  47.     // Add text to the QMimeData object.
  48.     // QVariant is like a union, it can
  49.     // contain different kinds of types.
  50.     mime->setImageData(QVariant(pixmap()));
  51.  
  52.     // Show a scaled icon of the current image next to
  53.     // the cursor when dragging. Scale it to be 30px wide.
  54.     drag->setPixmap(pixmap().scaledToWidth(30, Qt::FastTransformation));
  55.     // Set the cursor's tip (or hot spot) to point to
  56.     // the center of the pixmap's bottom edge.
  57.     drag->setHotSpot(QPoint(drag->pixmap().width()/2, drag->pixmap().height()));
  58.  
  59.     QLabel* label = new QLabel;
  60.     QString p=QString::number((int)this,16);
  61.  
  62.     label->setText("pointerINMOUSEMOVEEVENT="+p);
  63.     label->show();
  64.  
  65.  
  66.     // Start the drag operation.
  67.     drag->exec();
  68. }
  69.  
  70. void DnDPixmap::dragEnterEvent(QGraphicsSceneDragDropEvent *event)
  71. {
  72.     // Is the data correct (an image that can be loaded)?
  73.     bool imageLoaded = false;
  74.     const QMimeData *mime = event->mimeData();
  75.     // Are there URLs present?
  76.     if (mime->hasUrls())
  77.     {
  78.         // Fetch the list of URLs dragged over.
  79.         const QList<QUrl> &urls = mime->urls();
  80.         if (!urls.empty())
  81.         {
  82.             // Try to load the first URL as an image.
  83.             // Modify imageLoaded according to
  84.             // the success of this operation.
  85.             imageLoaded = pix.load(urls[0].toLocalFile());
  86.         }
  87.     }
  88.     // Is there an image present?
  89.     else if (mime->hasImage())
  90.     {
  91.         // Convert the data to an QImage.
  92.         // The construct qvariant_cast is used to convert 
  93.         // a stored value to another type.
  94.         QImage img = qvariant_cast<QImage>(mime->imageData());
  95.         // Load the QImage in a QPixmap.
  96.         pix = QPixmap::fromImage(img);
  97.         // Check if the pixmap is not blank.
  98.         imageLoaded = !pix.isNull();
  99.     }
  100.  
  101.     QLabel* label = new QLabel;
  102.     QString p=QString::number((int)this,16);
  103.  
  104.     label->setText("pointerINDRAGENTEREVENT="+p);
  105.     label->show();
  106.  
  107.     // Only allow drops if the image loaded succesfully.
  108.     event->setAccepted(imageLoaded);
  109. }
  110.  
  111. void DnDPixmap::dropEvent(QGraphicsSceneDragDropEvent *event)
  112. {
  113.     QLabel* label = new QLabel;
  114.     QString p=QString::number((int)this,16);
  115.  
  116.     label->setText("pointerINDROPEVENT="+p);
  117.     label->show();
  118.     emit moveMade(/*x location where i drop my pixmap, havent found a simple way to get this*/,/*y location, description to the left, oudeX, oudeY);
  119.  
  120.     // Set the currently displayed pixmap to the dropped pixmap.
  121.     //setPixmap(pix);
  122. }
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When I'm dragging and dropping my chesspiece the value of the this pointer changes, which to me aint logical.
Can someone clarify this to me please?
Thanks in advance!