Hello Everybody,

I have written a program that permit drag and drop in a TreeView.
I have written a model like one written in internet

Qt Code: 
  1. class ModelBookNodeDescModel: public QAbstractItemModel
  2.             {
  3.             public slots:
  4.                 void saveToXml();
  5.             public:
  6.                 ModelBookNodeDescModel(std::string full_path, QObject *parent = 0);
  7.                 ~ModelBookNodeDescModel();
  8.  
  9.                 void setRootNode(ut::types::tModelBookNodeDesc *node);
  10.                 QModelIndex exportRootIndex();
  11.                 static void setParentOfAllNodes(ut::types::tModelBookNodeDesc *node);
  12.  
  13.                 QModelIndex createQModelIndex(ut::types::tModelBookNodeDesc &item);
  14.  
  15.                 QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const;
  16.                 QModelIndex parent(const QModelIndex &child) const;
  17.  
  18.                 int rowCount(const QModelIndex &parent) const;
  19.                 int columnCount(const QModelIndex &parent = QModelIndex()) const;
  20.  
  21.                 QVariant data(const QModelIndex &index, int role) const;
  22.                 Qt::ItemFlags flags(const QModelIndex &index) const;
  23.                 QVariant headerData(int section, Qt::Orientation orientation, int role) const;
  24.  
  25.                 bool insertRows(int position, int rows, std::vector<ut::types::tModelBookNodeDesc*> &tab ,const QModelIndex &parent = QModelIndex());
  26.                 bool removeRows(int position, int rows, const QModelIndex &parent = QModelIndex());
  27.                 bool setData(const QModelIndex &index, const ut::types::_tModelDesc &value,
  28.                     int role = Qt::EditRole);
  29.  
  30.  
  31.                 static bool parentHasChild(ut::types::tModelBookNodeDesc *&parent,
  32.                                     ut::types::tModelBookNodeDesc *&resultParent,
  33.                                     ut::types::tModelBookNodeDesc *&child,
  34.                                     int& recurse);
  35.  
  36.  
  37.                 void addChild(ut::types::tModelBookNodeDesc* parent, ut::types::tModelBookNodeDesc child);
  38.                 void deleteItem(ut::types::tModelBookNodeDesc *item);
  39.                 void insertParent(ut::types::tModelBookNodeDesc *child, ut::types::tModelBookNodeDesc parent);
  40.                 void setSelectedItem(ut::types::tModelBookNodeDesc *item);
  41.  
  42.             protected:
  43.                 ut::types::tModelBookNodeDesc *nodeFromIndex(const QModelIndex &index) const;
  44.                 ut::types::tModelBookNodeDesc *rootNode;
  45.                 ut::types::tModelBookNodeDesc *parentRootNode;
  46.                 ut::types::tModelBookNodeDesc *grandParentRootNode;
  47.  
  48.  
  49.             public:
  50.                 mutable QTreeView* m_view;
  51.  
  52.                 ut::types::tModelBookNodeDesc *selectedItem;
  53.  
  54.             };
  55.  
  56.  
  57.  
  58. class DragDropModel : public ModelBookNodeDescModel
  59. {
  60.     Q_OBJECT
  61.  
  62. public:
  63.     DragDropModel(const QString &full_path, QObject *parent = 0);
  64.  
  65.     Qt::ItemFlags flags(const QModelIndex &index) const;
  66.  
  67.     bool dropMimeData(const QMimeData *data, Qt::DropAction action,
  68.                       int row, int column, const QModelIndex &parent);
  69.     QMimeData *mimeData(const QModelIndexList &indexes) const;
  70.     QStringList mimeTypes() const;
  71.     Qt::DropActions supportedDropActions() const;
  72.     void removeSelectedIndex();
  73.  
  74. public slots:
  75.     void markIndex(const QModelIndex& index);
  76.  
  77.  
  78. protected:
  79.     QModelIndex *selectedIndex;
  80.     mutable std::vector<ut::types::tModelBookNodeDesc *> nodesToDelete;
  81.     mutable ut::types::tModelBookNodeDesc *newParent;
  82.  
  83. };
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with drag and drop inside the tree view that uses this model there is no problem.

the problem begins when I want to drag an object from outside the view into an element from the view.

the following code replaces the QtreeView witch receive the model

Qt Code: 
  1. class DragableDoubleTreeView : public QTreeView
  2. {
  3.     Q_OBJECT
  4. public:
  5.     DragableDoubleTreeView(QWidget *parent = 0);
  6.     void setDoubleTreeView(DoubleTreeView* view);
  7.  
  8. public slots:
  9.     void setSelected(const QModelIndex &index);
  10.  
  11. protected:
  12.     void mousePressEvent(QMouseEvent *event);
  13.     void mouseMoveEvent(QMouseEvent *event);
  14.     void dragEnterEvent(QDragEnterEvent *event);
  15.     void dragMoveEvent(QDragMoveEvent *event);
  16.     void dropEvent(QDropEvent *event);
  17.  
  18.     DoubleTreeView *m_doubleTreeView;
  19.  
  20. private:
  21.     void startDrag();
  22.     QModelIndex *m_modelIndex;
  23.  
  24.  
  25.  
  26.     QPoint startPos;
  27. };
  28.  
  29.  
  30. this portion of code interact negatively  with the preceding drag and drop model and it does permit to had an element
  31. to the list but not an element into a parent element of the list.
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if someone has a solution it would thanks him gratefully

Best Regards.
Utopia500