VTK/Examples/Cxx/Interaction/UserEvent

#include <vtkSphereSource.h>
#include <vtkCallbackCommand.h>
#include <vtkCommand.h>
#include <vtkPolyData.h>
#include <vtkSmartPointer.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
 
#include "vtkTestFilter.h"
 
static void CallbackFunction(vtkObject* caller,
                long unsigned int eventId,
                void* clientData,
                void* callData );
 
int main(int argc, char *argv[])
{
  // Create a renderer, render window, and interactor
  vtkSmartPointer<vtkRenderer> renderer =
    vtkSmartPointer<vtkRenderer>::New();
  vtkSmartPointer<vtkRenderWindow> renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer(renderer);
  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  renderWindowInteractor->SetRenderWindow(renderWindow);
 
  vtkSmartPointer<vtkTestFilter> filter =
    vtkSmartPointer<vtkTestFilter>::New();
 
  vtkSmartPointer<vtkCallbackCommand> callback =
    vtkSmartPointer<vtkCallbackCommand>::New();
  callback->SetCallback(CallbackFunction );
  filter->AddObserver(filter->RefreshEvent, callback);
 
  filter->Update();
 
  renderWindow->Render();
  renderWindowInteractor->Start();
 
  return EXIT_SUCCESS;
}
 
void CallbackFunction(vtkObject* caller,
                long unsigned int eventId,
                void* clientData, void* callData )
{
  std::cout << "CallbackFunction called." << std::endl;
}

#ifndef __vtkTestFilter_h
#define __vtkTestFilter_h
 
#include "vtkPolyDataAlgorithm.h"
 
class vtkTestFilter : public vtkPolyDataAlgorithm
{
public:
  vtkTypeMacro(vtkTestFilter,vtkPolyDataAlgorithm);
  static vtkTestFilter *New();
 
  int RefreshEvent;
 
protected:
  vtkTestFilter();
 
  int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *);
 
private:
  vtkTestFilter(const vtkTestFilter&);  // Not implemented.
  void operator=(const vtkTestFilter&);  // Not implemented.
 
};
 
#endif
 
#include "vtkObjectFactory.h"
#include "vtkCommand.h"
#include "vtkStreamingDemandDrivenPipeline.h"
#include "vtkInformationVector.h"
#include "vtkInformation.h"
#include "vtkDataObject.h"
#include "vtkSmartPointer.h"
#include "vtkAppendPolyData.h"
#include "vtkSphereSource.h"
 
vtkStandardNewMacro(vtkTestFilter);
 
vtkTestFilter::vtkTestFilter()
{
  this->SetNumberOfInputPorts(0);
 
  this->RefreshEvent = vtkCommand::UserEvent + 1;
 
}
 
int vtkTestFilter::RequestData(vtkInformation *vtkNotUsed(request),
                                             vtkInformationVector **inputVector,
                                             vtkInformationVector *outputVector)
{
  // Get the info object
  vtkInformation *outInfo = outputVector->GetInformationObject(0);
 
  vtkPolyData *output = vtkPolyData::SafeDownCast(
      outInfo->Get(vtkDataObject::DATA_OBJECT()));
  this->InvokeEvent(this->RefreshEvent, NULL);
 
  return 1;
}