How to stop calling data() function for the child items in a tree view initially

[DURGAPRASAD NEELAM]

The only function I have implemented in customized QSortFilterProxyModel is filterAcceptsRow( int sourceRow, const QModelIndex& sourceParent ) const.
I have not implemented the data() function.

What are the function I should to re implement while using proxy?

Thanks in Advance.

[DURGAPRASAD NEELAM]

I have implemented data() in proxy too, still same issue.

QVariant proxy::data(const QModelIndex & proxy_index, int role) const
{
     if ( ! index.isValid() )
        return QVariant();
 
    QModelIndex source_index = mapToSource(proxy_index);
 
    return QSortFilterProxyModel::data(proxy_index, role);
}

QVariant proxy::data(const QModelIndex & proxy_index, int role) const
{
     if ( ! index.isValid() )
        return QVariant();
   
    QModelIndex source_index = mapToSource(proxy_index);
    
    return QSortFilterProxyModel::data(proxy_index, role);
}

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[wysota]

Try minimizing your example instead of throwing in more and more code. Can you reproduce the issue with a bare standard item model and a bare QTreeView?

[DURGAPRASAD NEELAM]

When I tried using with QTreeView only, data function is calling as expected.

[wysota]

When I tried using with QTreeView only, data function is calling as expected.

So please show your customizations to the view.

[DURGAPRASAD NEELAM]

Below is the code for view. (there is lot of other c++ code in view, but typical qt related stuff in view is this much)

MyView::MyView ( Model* treeModel) : QTreeView(parent)
{   
    setContextMenuPolicy( Qt::DefaultContextMenu ); 
    setSelectionMode( QAbstractItemView::ExtendedSelection );
    setSelectionBehavior( QAbstractItemView::SelectItems );   
    installEventFilter( this );
 
    m_proxyTreeModel = new ProxyModel( this );                 // proxy model:
    m_proxyTreeModel->setSourceModel( m_treeModel );     // tree model created in viewer:
    m_proxyTreeModel->setDynamicSortFilter(true);
    setModel( m_proxyTreeModel );
 
    setAllColumnsShowFocus( true );
    setUniformRowHeights( true );
}

MyView::MyView ( Model* treeModel) : QTreeView(parent)
{   
    setContextMenuPolicy( Qt::DefaultContextMenu ); 
    setSelectionMode( QAbstractItemView::ExtendedSelection );
    setSelectionBehavior( QAbstractItemView::SelectItems );   
    installEventFilter( this );
    
    m_proxyTreeModel = new ProxyModel( this );                 // proxy model:
    m_proxyTreeModel->setSourceModel( m_treeModel );     // tree model created in viewer:
    m_proxyTreeModel->setDynamicSortFilter(true);
    setModel( m_proxyTreeModel );

    setAllColumnsShowFocus( true );
    setUniformRowHeights( true );
}

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[wysota]

This is not your real code. This wouldn't even compile. Even if it did, it would crash when ran. And you were supposed to use a standard model against your custom view. Without any proxy models inbetween.