Hi

I'm having dificulty using drag & drop for QTreeView. Actually i'm trying to move an item by drag n drop. I think i've setup everything as documented in qt4 docs. See the code below, may be you could find mistakes.

So far i've noticed following misbehaviour: -
  • When an item is moved, a new copy of the item is created.
  • When i start dragging an item from say first column and drap at say second column, a new copy of the item is created with text of column1 in column2, column 2 in column3, so on....


Set up QTreeView like this: -
Qt Code: 
  1. m_pDetailView->setDragEnabled(TRUE);
  2.     m_pDetailView->setAcceptDrops(TRUE);
  3.     m_pDetailView->setDropIndicatorShown(TRUE);
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Have following in QAbstractItemMode derived class
Qt Code: 
  1. Qt::ItemFlags NowPlayingModel::flags(const QModelIndex& index)const{
  2.     if(!index.isValid())
  3.         return Qt::ItemIsEnabled | Qt::ItemIsDropEnabled;
  4.     Qt::ItemFlags flags = Qt::ItemIsSelectable | Qt::ItemIsEnabled | Qt::ItemIsDragEnabled;
  5.     if(mColumns.at(index.column()).isEditable)
  6.         flags |= Qt::ItemIsEditable;
  7.     return flags;
  8. }
  9.  
  10. Qt::DropActions NowPlayingModel::supportedDropActions() const{
  11.     return Qt::CopyAction | Qt::MoveAction;
  12. }
  13. //This function is never called
  14. bool NowPlayingModel::removeRows(int row, int count, const QModelIndex &parent){
  15.     qDebug("Remove");
  16.     if(parent.isValid())
  17.         return FALSE;
  18.     beginRemoveRows(parent, row, row + count - 1);
  19.     for(int i = 0; i < count; ++i){
  20.         delete m_pAllData->takeAt(row);
  21.     }
  22.     endRemoveRows();
  23.     return TRUE;
  24. }
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Please guide me through the correct way. I've tried everything i could.

Thanks in advance.