Method SetLayoutImpl

Modules/QtWidgets/src/QmitkMxNMultiWidget.cpp:511–565

///////////////////////////////////////////////////////////////////// PRIVATE /////////////////////////////////////////////////////////////////////

// PRIVATE
//////////////////////////////////////////////////////////////////////////
void QmitkMxNMultiWidget::SetLayoutImpl()
{
  int requiredRenderWindowWidgets = this->GetRowCount() * this->GetColumnCount();
  int existingRenderWindowWidgets = this->GetRenderWindowWidgets().size();

  int difference = requiredRenderWindowWidgets - existingRenderWindowWidgets;
  while (0 < difference)
  {
    // more render window widgets needed
    this->CreateRenderWindowWidget();
    --difference;
  }

  while (0 > difference)
  {
    // Remove the highest 'widget<i>' that is registered. Routing through
    // the name-keyed overload (rather than the no-arg lex-last variant)
    // guarantees the right cell is removed once the editor crosses 10 cells:
    // {widget0..widget11} sorts as widget0 < widget1 < widget10 < widget11
    // < widget2 < ..., so lex-last would otherwise pick widget9.
    bool removed = false;
    for (std::size_t i = this->GetNumberOfRenderWindowWidgets(); i-- > 0; )
    {
      const auto id = this->GetMultiWidgetName() + NAMESPACE_DELIMITER + QStringLiteral("widget") + QString::number(i);
      if (nullptr != this->GetRenderWindowWidget(id))
      {
        this->RemoveRenderWindowWidget(id);
        removed = true;
        break;
      }
    }
    if (!removed)
    {
      // No 'widget<i>' cell present - mixed with custom-named layout. Bail
      // rather than spinning; the caller is expected to ApplyLayout/
      // RollBackToSingleDefaultCell when entering an inconsistent state.
      MITK_WARN << "SetLayout: cannot shrink to " << requiredRenderWindowWidgets
                << " cells - " << this->GetNumberOfRenderWindowWidgets()
                << " custom-named cells remain. Layout dimensions ("
                << this->GetRowCount() << "x" << this->GetColumnCount()
                << ") are now out of sync with the cell count. Use ApplyLayout "
                   "or RollBackToSingleDefaultCell to recover a consistent state.";
      break;
    }
    ++difference;
  }

  auto firstRenderWindowWidget = this->GetFirstRenderWindowWidget();
  if (nullptr != firstRenderWindowWidget)
  {
    this->SetActiveRenderWindowWidget(firstRenderWindowWidget);
  }

  this->GetMultiWidgetLayoutManager()->SetLayoutDesign(QmitkMultiWidgetLayoutManager::LayoutDesign::DEFAULT);
}

QmitkAbstractMultiWidget::RenderWindowWidgetPointer QmitkMxNMultiWidget::CreateRenderWindowWidget()
{