SoSelectOne.h

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/*=======================================================================
** Author      : Gavin Bell (MMM yyyy)
**=======================================================================*/
/*=======================================================================
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**=======================================================================*/
/*=======================================================================
** Modified by : VSG (MMM YYYY)
**=======================================================================*/
 
 
#ifndef  _SO_SELECTONE_
#define  _SO_SELECTONE_
 
#include <Inventor/engines/SoSubEngine.h>
#include <Inventor/fields/SoSFInt32.h>
#include <Inventor/fields/SoSFName.h>
 
//
//  Class: SoSelectOne
//
//  Class that select a single value from a multiple-valued field.
//
 
class  SoSelectOne : public SoEngine {
  
  SO_ENGINE_HEADER(SoSelectOne);
  
 public:
  SoSelectOne(SoType mfInputType);
 
  SoSFInt32 index;
 
  SoMField *input;
 
  SoEngineOutput *output;
 
 private:
  static void initClass();
  static void exitClass();
 
  // Copies an instance that is encountered through a field connection
  virtual SoFieldContainer *copyThroughConnection() const;
 
 private:
  ~SoSelectOne();
 
  virtual void evaluate();
 
 private:
  SoSelectOne();
  
  // SelectOne engines must write out their input type before writing
  // their fields, so these are overridden:
  virtual SbBool readInstance(SoInput *in, unsigned short flags);
  virtual void writeInstance(SoOutput *out);
  
  void setup(SoType);
  
  int conversionCase;
  
  SoFieldData *myInputData;
  SoEngineOutputData *myOutputData;
  
  SoSFName typeField; // Used when reading/writing
};
 
#endif /* _SO_SELECTONE_ */