#include <QApplication>
#include <QTreeWidget>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QTreeWidget *treeWidget = new QTreeWidget();
    treeWidget->setDragDropMode(QAbstractItemView::DragDrop);
    treeWidget->setDefaultDropAction(Qt::MoveAction);
    treeWidget->setVerticalScrollMode(QAbstractItemView::ScrollPerPixel);
    treeWidget->show();

    QTreeWidgetItem * top = new QTreeWidgetItem(QStringList() << "TopLevel");
    treeWidget->addTopLevelItem(top);
    for(int i=0; i<5; i++)
        new QTreeWidgetItem(top,QStringList() << QString("item")+QString::number(i));
    top->setExpanded(true);

    return a.exec();
}