SoSFTrigger.h

/*=======================================================================
 * Copyright 1991-1996, Silicon Graphics, Inc.
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 * in Technical Data and Computer Software clause at DFARS 252.227-7013 and/or
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 * THE CONTENT OF THIS WORK CONTAINS CONFIDENTIAL AND PROPRIETARY
 * INFORMATION OF SILICON GRAPHICS, INC. ANY DUPLICATION, MODIFICATION,
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**=======================================================================*/
/*=======================================================================
** Author      : Ronen Barzel (MMM yyyy)
**=======================================================================*/
/*=======================================================================
 *** THE CONTENT OF THIS WORK IS PROPRIETARY TO FEI S.A.S, (FEI S.A.S.),            ***
 ***              AND IS DISTRIBUTED UNDER A LICENSE AGREEMENT.                     ***
 ***                                                                                ***
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 ***                                                                                ***
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 ***  CLAUSE  AT FAR 52.227-19  OR SUBPARAGRAPH  (C)(1)(II)  OF  THE RIGHTS IN      ***
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 ***                   COPYRIGHT (C) 1996-2014 BY FEI S.A.S,                        ***
 ***                        BORDEAUX, FRANCE                                        ***
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**=======================================================================*/
/*=======================================================================
** Modified by : VSG (MMM YYYY)
**=======================================================================*/
 
 
#ifndef  _SO_SF_TRIGGER_
#define  _SO_SF_TRIGGER_
 
#include <Inventor/fields/SoSubField.h>

//
//  SoSFTrigger subclass of SoSField.
//

class  SoSFTrigger : public SoSField {
 
  // Use standard field stuff
  SO_SFIELD_REQUIRED_HEADER(SoSFTrigger);
  SO_SFIELD_CONSTRUCTOR_HEADER(SoSFTrigger);
 
 public:
  void                setValue()              { touch(); }

  void                getValue() const        { }
 
  // Start notification.
  virtual void        touch();

  int                 operator ==(const SoSFTrigger &t) const;
  int                 operator !=(const SoSFTrigger &t) const;
 
 private:
  static void         initClass();
  static void exitClass();
 
  // Notification can flow through a trigger, but can't start at a
  // trigger.  The only way to start notification at a trigger is to
  // call touch().
  virtual void        startNotify();
 
  // Override notify to always evaluate (after passing on
  // notification) to clear upstream dirty bits
  virtual void        notify(SoNotList *list);
 
 private:
  // Reading and writing. These are no-ops.
  virtual SbBool      readValue(SoInput *in);
  virtual void        writeValue(SoOutput *out) const;
 
};
 
#endif /* _SO_SF_TRIGGER_ */