Method contextMenuEvent

src/openms_gui/source/VISUAL/Plot2DCanvas.cpp:846–1269

  }

  void Plot2DCanvas::contextMenuEvent(QContextMenuEvent * e)
  {
    // abort if there are no layers
    if (layers_.empty())
    {
      return;
    }
    const LayerDataBase& layer = getCurrentLayer();

    QMenu* context_menu = new QMenu(this);

    QAction* a = nullptr;
    QAction* result = nullptr;

    //Display name and warn if current layer invisible
    String layer_name = String("Layer: ") + layer.getName();
    if (!layer.visible)
    {
      layer_name += " (invisible)";
    }
    context_menu->addAction(layer_name.toQString())->setEnabled(false);
    context_menu->addSeparator();

    context_menu->addAction("Layer meta data");

    QMenu * settings_menu = new QMenu("Settings");
    settings_menu->addAction("Show/hide grid lines");
    settings_menu->addAction("Show/hide axis legends");
    context_menu->addSeparator();

    context_menu->addAction("Switch to 3D view");

    const RangeType e_units = [&](){ // mouse position in units
      RangeType r;
      unit_mapper_.fromXY(widgetToData_(e->pos()), r);
      return r; }();

    // a small 10x10 pixel area around the current mouse position
    auto check_area = visible_area_.cloneWith({widgetToData_(e->pos() - QPoint(10, 10)), widgetToData_(e->pos() + QPoint(10, 10))}).getAreaUnit();

    //-------------------PEAKS----------------------------------
    if (auto* lp = dynamic_cast<const LayerDataPeak*>(&layer))
    {
      //add settings
      settings_menu->addSeparator();
      settings_menu->addAction("Show/hide projections");
      settings_menu->addAction("Show/hide MS/MS precursors");

      //add surrounding survey scans
      //find nearest survey scan
      SignedSize size = lp->getPeakData()->size();
      Int current = lp->getPeakData()->RTBegin(e_units.getMinRT()) - lp->getPeakData()->begin();
      if (current == size)  // if only one element is present RTBegin points to one after the last element (see RTBegin implementation)
      {
        current = 0;
      }

      SignedSize i = 0;