Method updateCheckState

Libs/Widgets/ctkCheckableModelHelper.cpp:161–217

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//-----------------------------------------------------------------------------
void ctkCheckableModelHelperPrivate
::updateCheckState(const QModelIndex& modelIndex)
{
  Q_Q(ctkCheckableModelHelper);
  bool checkable = false;
  int oldCheckState = this->checkState(modelIndex, &checkable);
  if (!checkable)
    {
    return;
    }

  Qt::CheckState newCheckState = Qt::PartiallyChecked;
  bool firstCheckableChild = true;
  const int rowCount = q->orientation() == Qt::Horizontal ?
    q->model()->rowCount(modelIndex) : 1;
  const int columnCount = q->orientation() == Qt::Vertical ?
    q->model()->columnCount(modelIndex) : 1;
  for (int r = 0; r < rowCount; ++r)
    {
    for (int c = 0; c < columnCount; ++c)
      {
      QModelIndex child = q->model()->index(r, c, modelIndex);
      QVariant childCheckState = q->model()->data(child, Qt::CheckStateRole);
      int childState = childCheckState.toInt(&checkable);
      if (!checkable)
        {
        continue;
        }
      if (firstCheckableChild)
        {
        newCheckState = static_cast<Qt::CheckState>(childState);
        firstCheckableChild = false;
        }
      if (newCheckState != childState)
        {
        newCheckState = Qt::PartiallyChecked;
        }
      if (newCheckState == Qt::PartiallyChecked)
        {
        break;
        }
      }
    if (!firstCheckableChild && newCheckState == Qt::PartiallyChecked)
      {
      break;
      }
    }
  if (oldCheckState == newCheckState)
    {
    return;
    }
  this->setCheckState(modelIndex, newCheckState);
  if (modelIndex != q->rootIndex())
    {
    this->updateCheckState(modelIndex.parent());
    }
}