SoMFEngine.h

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**=======================================================================*/
/*=======================================================================
** Author      : Paul S. Strauss (MMM yyyy)
**=======================================================================*/
/*=======================================================================
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**=======================================================================*/
/*=======================================================================
** Modified by : VSG (MMM YYYY)
**=======================================================================*/
 
 
#ifndef  _SO_MF_ENGINE_
#define  _SO_MF_ENGINE_
 
class SoEngine;
 
#include <Inventor/fields/SoSubField.h>
 
//
//  SoMFEngine subclass of SoMField. Each field value is a pointer to an
//  SoEngine. The field automatically maintains references to the engines
//  it points to and propagates notification from the engines.
//
 
class  SoMFEngine : public SoMField {
  
  // Use standard field stuff
  SO_MFIELD_HEADER(SoMFEngine, SoEngine *, SoEngine *);
  SO_MFIELD_SETVALUESPOINTER_HEADER(SoEngine *);
    
 private:
    static void initClass();
    static void exitClass();
 
  // Update a copied field to use the copy of each engine if there is one
  virtual void fixCopy(SbBool copyConnections);
  
  // Override this to also check the stored engines
  virtual SbBool referencesCopy() const;
  
 private:
  // Override this to maintain write-references in engines
  virtual void countWriteRefs(SoOutput *out) const;
  
  // Changes value in field without doing other notification stuff.
  // Keeps track of references and auditors.
  void setVal(int index, SoEngine *newValue);
 
};
 
#endif /* _SO_MF_ENGINE_ */