use SelectionDescriptor in MesoCrystalItem

GUI/Models/MesoCrystalItem.cpp

@@ -125,6 +125,11 @@ std::unique_ptr<IFormFactor> MesoCrystalItem::getOuterShape() const
     return ff_item.createFormFactor();
 }
 
+SelectionDescriptor<FormFactorItem*> MesoCrystalItem::outerShape()
+{
+    return SelectionDescriptor<FormFactorItem*>(item<GroupItem>(P_OUTER_SHAPE));
+}
+
 ItemWithParticles* MesoCrystalItem::basisParticle() const
 {
     return dynamic_cast<ItemWithParticles*>(getItem(T_BASIS_PARTICLE));

GUI/Models/MesoCrystalItem.h

@@ -17,6 +17,7 @@
 
 #include "Base/Vector/Vectors3D.h"
 #include "GUI/Models/ItemWithParticles.h"
+#include "GUI/Models/SelectionDescriptor.h"
 #include "Sample/Lattice/Lattice3D.h"
 
 class FormFactorItem;
@@ -46,6 +47,9 @@ public:
     std::unique_ptr<IFormFactor> getOuterShape() const;
     template <typename T> T* setOuterShapeType();
 
+    SelectionDescriptor<FormFactorItem*> outerShape();
+
+
     ItemWithParticles* basisParticle() const;
 
     void setVectorA(const R3& vector_a);