.. _program_listing_file_MRML_vtkMRMLLayerDMObjectEventObserverScripted.cxx:

Program Listing for File vtkMRMLLayerDMObjectEventObserverScripted.cxx
======================================================================

|exhale_lsh| :ref:`Return to documentation for file <file_MRML_vtkMRMLLayerDMObjectEventObserverScripted.cxx>` (``MRML/vtkMRMLLayerDMObjectEventObserverScripted.cxx``)

.. |exhale_lsh| unicode:: U+021B0 .. UPWARDS ARROW WITH TIP LEFTWARDS

.. code-block:: cpp

   #include "vtkMRMLLayerDMObjectEventObserverScripted.h"
   
   #include "vtkMRMLLayerDMPythonUtil.h"
   #include <vtkObjectFactory.h>
   
   vtkStandardNewMacro(vtkMRMLLayerDMObjectEventObserverScripted);
   
   vtkMRMLLayerDMObjectEventObserverScripted::vtkMRMLLayerDMObjectEventObserverScripted()
     : m_object(nullptr)
   {
     this->SetUpdateCallback(
       [this](vtkObject* node, unsigned long eventId, void* callData) -> void
       {
         if (!vtkMRMLLayerDMPythonUtil::IsValidPythonContext())
         {
           return;
         }
   
         vtkPythonScopeGilEnsurer gilEnsurer;
         if (auto result = vtkMRMLLayerDMPythonUtil::CallPythonObject(this->m_object, vtkMRMLLayerDMPythonUtil::ToPyArgs(node, eventId, callData)))
         {
           Py_DECREF(result);
         }
         else
         {
           auto errorMsg = std::string(__func__) + ": Failed to call : " + vtkMRMLLayerDMPythonUtil::GetObjectStr(this->m_object) + ":";
           vtkMRMLLayerDMPythonUtil::PrintErrorTraceback(this, errorMsg);
         }
       });
   }
   
   vtkMRMLLayerDMObjectEventObserverScripted::~vtkMRMLLayerDMObjectEventObserverScripted()
   {
     vtkMRMLLayerDMPythonUtil::DeletePythonObject(&this->m_object);
   }
   
   void vtkMRMLLayerDMObjectEventObserverScripted::SetPythonCallback(PyObject* object)
   {
     vtkMRMLLayerDMPythonUtil::SetPythonObject(&this->m_object, object);
   }
   
   PyObject* vtkMRMLLayerDMObjectEventObserverScripted::CastCallData(PyObject* object, int vtkType)
   {
     return vtkMRMLLayerDMPythonUtil::CastCallData(object, vtkType);
   }