Checkbox in QTreeView

[mugi]

Hi,
I need to add checkboxes to the first three columns in a QTreeView which gets its data
from a QAbstractItemModel .
Could some one tell me how to complete my model, so that the user can freely check and uncheck theses checkboxes.

QModelIndex OutputsListModel::index ( int row, int column, const QModelIndex & parent) const 
       { 
             return createIndex(row, column); 
       } 
QModelIndex OutputsListModel::parent ( const QModelIndex & index ) const 
       { 
            return QModelIndex(); 
       } 
 
 int OutputsListModel::rowCount ( const QModelIndex & parent) const 
       { 
            return(r); 
       } 
int OutputsListModel::columnCount ( const QModelIndex & parent) const 
       { 
            return(c); 
       } 
bool OutputsListModel::hasChildren ( const QModelIndex & parent ) const 
       {..... 
       } 
QVariant OutputsListModel::data ( const QModelIndex & index, int role) const 
       {    int i = index.column(); 
            if(role == Qt::DisplayRole) 
            {..... 
            } 
         } 
Qt::ItemFlags OutputsListModel::flags(const QModelIndex& index) const 
       { 
           if (i == 0 || i== 1 || i == 2) 
               return Qt::ItemIsUserCheckable | Qt::ItemIsSelectable | Qt::ItemIsEnabled; 
           return Qt::ItemIsSelectable | Qt::ItemIsEnabled; 
       } 
bool OutputsListModel::setData(const QModelIndex& index, const QVariant& value, int role) 
        { 
             return true; 
        }

QModelIndex OutputsListModel::index ( int row, int column, const QModelIndex & parent) const 
       { 
             return createIndex(row, column); 
       } 
QModelIndex OutputsListModel::parent ( const QModelIndex & index ) const 
       { 
            return QModelIndex(); 
       } 
        
 int OutputsListModel::rowCount ( const QModelIndex & parent) const 
       { 
            return(r); 
       } 
int OutputsListModel::columnCount ( const QModelIndex & parent) const 
       { 
            return(c); 
       } 
bool OutputsListModel::hasChildren ( const QModelIndex & parent ) const 
       {..... 
       } 
QVariant OutputsListModel::data ( const QModelIndex & index, int role) const 
       {    int i = index.column(); 
            if(role == Qt::DisplayRole) 
            {..... 
            } 
         } 
Qt::ItemFlags OutputsListModel::flags(const QModelIndex& index) const 
       { 
           if (i == 0 || i== 1 || i == 2) 
               return Qt::ItemIsUserCheckable | Qt::ItemIsSelectable | Qt::ItemIsEnabled; 
           return Qt::ItemIsSelectable | Qt::ItemIsEnabled; 
       } 
bool OutputsListModel::setData(const QModelIndex& index, const QVariant& value, int role) 
        { 
             return true; 
        }

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