Create, invoke and observe vtk custom event

pieper · May 30, 2020, 4:54pm

Hi Paolo -

Good point - right now you get the same ModifiedEvent no matter what parameter changed. You would need to keep track of the old values and check which one had changed.

Currently we just call Modified in SetParameter, but we could change that to be this->InvokeEvent(vtkCommand::ModifiedEvent, name)

github.com

Slicer/Slicer/blob/421d1c06a9ac4ead72bdd338dd7358ea48008b25/Libs/MRML/Core/vtkMRMLScriptedModuleNode.cxx#L144


      
          }
          
          //----------------------------------------------------------------------------
          void vtkMRMLScriptedModuleNode
          ::SetParameter(const std::string& name, const std::string& value)
          {
            const std::string currentValue = this->GetParameter(name);
            if (value != currentValue)
              {
              this->Parameters[name] = value;
              this->Modified();
              }
          }
          
          //----------------------------------------------------------------------------
          void vtkMRMLScriptedModuleNode::UnsetParameter(const std::string& name)
          {
            int count = this->Parameters.erase(name);
            if (count > 0)
              {
              this->Modified();

Then you should be able to get the parameter using the method described here

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Create, invoke and observe vtk custom event

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