C++ (Qt)
setSelectionBehavior(QAbstractItemView::SelectRows);
setSelectionMode(QAbstractItemView::ExtendedSelection);
 

C++ (Qt)
 
Qt::ItemFlags MyTableModel::flags(const QModelIndex &index) const
{
    if (!index.isValid())
        return Qt::NoItemFlags;
 
    return QAbstractTableModel::flags(index) | Qt::ItemIsSelectable;
 
}
 

C++ (Qt)
void  TreeView::mousePressEvent(QMouseEvent *e)
{
    if(e->modifiers() & Qt::Controlmodifier)
   {
       QModelIndex idx = indexAt(e->pos());
 
       QModelIndex topLeft = model()->index(idx.row(), 0, QModelIndex());
       QModelIndex bottomRight = model()->index(idx.row(), model()->columnCount() - 1, QModelIndex());
 
       QItemSelection selection(topLeft, bottomRight);
       selectionModel()->select(selection, QItemSelectionModel::Select);
   }
 
   return QTreeView::mousePressEvent(e);
}
 

C++ (Qt)
 
void container::add_mapping(Key key, Type &value)
{
    std::lock_guard<std::mutex> l(mutex);
    auto it = unordered_map.find(key);
    if(it == unordered_map.end()){
           Type *data = new Type;
           unordered_map.insert(std::make_pair(key, data));
           vectror.push_back(data);     
    } 
    else{
          *(it.operator->()->second) = value;
    }
 
}
 
std::vector<Type> container::get_vector()
{
       std::lock_guard<std::mutex> l(mutex);
       std::vector<Type> v;
       for(auto e : vector){
            v.push_back(*e);
       }      
       return v;
}
 

void Model::update(std::vector<Type> &fresh)
{
    int prvsz = store.size();
    int cursz = fresh.size();
 
    beginInsertRows(QModelIndex(), prvsz, cursz);
    store.swap(fresh);
    endInsertRows();
}

C++ (Qt)
 
void Model::upDate(std::vector<typedata> &fresh, QTreeview *view)
{
 
  int prvsz = v.size();
  int cursz = fresh.size();
  int count = cursz - prvsz;
 
 if (count>0) {
 
      beginInsertRows(QModelIndex(), prvsz, cursz - 1);
      v.swap(fresh);
      endInsertRows();
 }
 else if(count==0){   
  QRect viewportRect = view->viewport()->rect();
 
  QModelIndex topLeft = view->indexAt(viewportRect.topLeft());
  QModelIndex bottomRight = view->indexAt(viewportRect.bottomRight());
 
   if(topLeft.isValid() && bottomRight.isValid()){
        dataChanged(topLeft,bottomRight);
    }
 }
 else {
 
  beginInsertRows(QModelIndex(), cursz , prvsz - 1);
  v.swap(fresh);
  endInsertRows();
 }
  }