QTreView::isExpanded ( index ) allways false ?

[jpujolf]

Hi all,

I'm confused. Something wrong in my code or a Qt bug ?

I've a QTreeView, showing data as a grid with groups. I've implemented an "export to excel" method, that exports all model's data shown. First attempt worked. I can export all data, not AS shown. If a row is grouped, I export too its children.

Now, Im testing if every node is expanded and I can export only expanded rows, as must be...

Code is like this :

void Export_XLS ()
{
  <stuff>
  for ( int iRow = 0; iRow < m_GridModel->rowCount (); iRow++ )
     ExportRow ( m_GridModel->index ( iRow, 0 ) );
  <more stuff>
}
 
void ExportRow ( const QModelIndex & index )
{
  <...export data for this row...>
  if ( !m_Tree->isExpanded ( index ) ||
       !m_GridModel->hasChildren ( index ) ) return;
 
  // Recursive call
  for ( int iChild = 0; iChild < m_GridModel->rowCount ( index ); iChild++ )
     ExportRow ( index.child ( iChild, 0 ) );
}

void Export_XLS ()
{
  <stuff>
  for ( int iRow = 0; iRow < m_GridModel->rowCount (); iRow++ )
     ExportRow ( m_GridModel->index ( iRow, 0 ) );
  <more stuff>
}

void ExportRow ( const QModelIndex & index )
{
  <...export data for this row...>
  if ( !m_Tree->isExpanded ( index ) ||
       !m_GridModel->hasChildren ( index ) ) return;

  // Recursive call
  for ( int iChild = 0; iChild < m_GridModel->rowCount ( index ); iChild++ )
     ExportRow ( index.child ( iChild, 0 ) );
}

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But now I've seen that only first level of tree is exported, because isExpanded ALLWAYS return false, even if I user expands items on screen or expandall is called.

Why ?