qMRMLSubjectHierarchyTreeView_updateItemsSelectableFlag.cxx

//--------------------------------------------------------------------------
void qMRMLSubjectHierarchyTreeView::updateItemsSelectableFlag()
{
  Q_D(qMRMLSubjectHierarchyTreeView);
  if (!d->SubjectHierarchyNode)
    {
    return;
    }

  qMRMLSubjectHierarchyModel* sceneModel = qobject_cast<qMRMLSubjectHierarchyModel*>(this->model());

  // Collect selected subject hierarchy items
  std::vector<vtkIdType> childItemIDs;
  vtkIdType sceneId = d->SubjectHierarchyNode->GetSceneItemID();
  d->SubjectHierarchyNode->GetItemChildren(sceneId, childItemIDs, true);
  foreach(vtkIdType itemID, childItemIDs)
    {
    bool isSelectable = this->sortFilterProxyModel()->filterAcceptsItem(itemID, false);
    QStandardItem* item = sceneModel->itemFromSubjectHierarchyItem(itemID); // or proxy model?
    if (isSelectable)
      {
      item->setFlags(item->flags() & Qt::ItemIsSelectable);
      }
    else
      {
      item->setFlags(item->flags() & ~Qt::ItemIsSelectable);
      }
    qDebug() << itemID << ": " << isSelectable;
    }
}