change "+" symbol to other symbol when dragging an item from listview to treeview .

[Ratzz]

@Chris-Kawa
I tried these ways . But none of the two is working.

myWindow::myWindow(QWidget *parent,QMdiArea *mdiParent):
    QWidget(parent),
    QListView(parent)
    ui(new Ui::myWindow)
{
    ui->setupUi(this);
//
}

nor this as suggested here .

class myWindow: public QWidget
{
    Q_OBJECT
 
public:
    explicit myWindow(QWidget *parent = 0, QMdiArea *mdiParent=0)
        : QListView (paren,mdiParent ){}
      ......

Is there any document giving info about subclass?

[Ratzz]

I used dragMoveEvent to restrict the + symbol.

        void dragMoveEvent(QDragMoveEvent *event)
        {
            QPoint cursorPosition = event->pos() ;
            QModelIndex index = indexAt(cursorPosition);
            if(index.parent().isValid())
            {
                event->acceptProposedAction();
            }
            else
                event->ignore();
        }