Method CreateOpacityAction

Modules/SegmentationUI/src/QmitkMultiLabelInspector.cpp:1211–1280

}

QWidgetAction* QmitkMultiLabelInspector::CreateOpacityAction()
{
  auto selectedLabelValues = this->GetSelectedLabels();

  auto relevantLabelValues = !this->GetMultiSelectionMode() || selectedLabelValues.size() <= 1
    ? this->GetCurrentlyAffactedLabelInstances()
    : selectedLabelValues;

  std::vector<mitk::Label*> relevantLabels;

  if (!relevantLabelValues.empty())
  {
    for (auto value : relevantLabelValues)
    {
      auto label = this->m_Segmentation->GetLabel(value);
      if (label.IsNull())
        mitkThrow() << "Invalid state. Internal model returned a label value that does not exist in segmentation. Invalid value:" << value;
      relevantLabels.emplace_back(label);
    }

    auto* opacitySlider = new QSlider;
    opacitySlider->setMinimum(0);
    opacitySlider->setMaximum(100);
    opacitySlider->setOrientation(Qt::Horizontal);

    auto opacity = relevantLabels.front()->GetOpacity();
    opacitySlider->setValue(static_cast<int>(opacity * 100));
    auto segmentation = m_Segmentation;
    auto guard = &m_LabelHighlightGuard;

    auto onChangeLambda = [segmentation, relevantLabels](const int value)
      {
        auto opacity = static_cast<float>(value) / 100.0f;
        for (auto label : relevantLabels)
        {
          label->SetOpacity(opacity);
          segmentation->UpdateLookupTable(label->GetValue());
        }
        segmentation->GetLookupTable()->Modified();
        mitk::RenderingManager::GetInstance()->RequestUpdateAll();
      };
    QObject::connect(opacitySlider, &QSlider::valueChanged, this, onChangeLambda);

    auto onPressedLambda = [guard]()
      {
        guard->SetHighlightedLabels({});
      };
    QObject::connect(opacitySlider, &QSlider::sliderPressed, this, onPressedLambda);

    auto onReleasedLambda = [relevantLabelValues, guard]()
      {
        guard->SetHighlightedLabels(relevantLabelValues);
      };
    QObject::connect(opacitySlider, &QSlider::sliderReleased, this, onReleasedLambda);

    QLabel* opacityLabel = new QLabel("Opacity: ");
    QVBoxLayout* opacityWidgetLayout = new QVBoxLayout;
    opacityWidgetLayout->setContentsMargins(4, 4, 4, 4);