Inventor/elements/SoElement.h

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/*=======================================================================
 * Copyright 1991-1996, Silicon Graphics, Inc.
 * ALL RIGHTS RESERVED
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**=======================================================================*/
/*=======================================================================
** Author      : Paul S. Strauss (MMM yyyy)
**=======================================================================*/
/*=======================================================================
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**=======================================================================*/
/*=======================================================================
** Modified by : VSG (MMM YYYY)
**=======================================================================*/


#ifndef  _SO_ELEMENT
#define  _SO_ELEMENT

#include <Inventor/SoType.h>
#include <Inventor/SoTypedObject.h>
#include <Inventor/misc/SoState.h>
#include <Inventor/errors/SoDebugError.h>
#include <assert.h>

class SoNotList;

SoEXTENDER_Documented class  SoElement: public SoTypedObject {

 public:

  virtual void push(SoState *state);

  virtual void pop(SoState *state, const SoElement *prevTopElement);

  virtual void print(FILE *fp) const;

  static SoType getClassTypeId();

  virtual SoType getTypeId() const       { return typeId; }

private:

  virtual void commonInit();

  virtual void init(SoState *state);

  virtual SbBool matches(const SoElement* elt) const = 0;

  virtual SoElement* copyMatchInfo() const = 0;

  SoElement* getNextInStack() const { return nextInStack; }

 private:
  // Initialize ALL Inventor element classes
  static void initElements();
  static void exitElements();

  virtual int getClassStackIndexInternal() const = 0;

  // Initializes the SoElement class
  static void initClass();
  static void exitClass();

  // Returns the number of stack indices allocated
  static int getNumStackIndices();

  // Returns the id for the element with the given stack index
  static SoType getIdFromStackIndex(int stackIndex);

  // Returns the stack index for an element instance
  inline int getStackIndex() const   { return stackIndex; }
  
  // Sets stackIndex in instance
  void setStackIndex(int index)        { stackIndex = index; }

  // Sets stuff in an element instance
  void setDepth(int dpth)              { depth = dpth; }
  void setNext(SoElement *nxt)         { next = nxt; }
  void setNextInStack(SoElement *nxt)  { nextInStack = nxt; }
  void setNextFree(SoElement *nxt)     { nextFree = nxt; }

  // Returns stuff from element instance
  int getDepth() const               { return depth; }
  SoElement* getNext()  const        { return next; }

  static const SoElement* getStackElement(SoState *state, SoType type, int stackIndex);

  static const SoElement* getConstElement(SoState *state, SoType type, int stackIndex);

  template<typename T>
  static const T* getConstElement(SoState *state)
  {
    return static_cast<const T*>(getConstElement(state, T::getClassTypeId(), T::getClassStackIndex()));
  }

  // Sets/Gets the pop priority.
  // Higher priority will be popped first.
  void setPopPriority(unsigned short priority) {m_popPriority = priority ;}
  unsigned short getPopPriority() const { return m_popPriority ; }

  // Destructor
  virtual ~SoElement();

  // This is called when a referenced SoBase (path, field, node, whatever) is
  // deleted. All subclasses must implement this to do the right
  // thing in case of reference to any SoBase object.
  virtual void dyingReference() {} ;

  inline SoType getInstanceTypeId() const
  {
    // if this assert is triggered it means that SO_SUB_ELEMENT macro
    // are not use/defined correctly: setTypeId(classTypeId) has not
    // been called in element constructor (see constructor code above)
    assert(typeId!=SoType::badType());
    return typeId;
  }

#if 1             SoDEPRECATED
  static const SoElement* getConstElement(SoState *state, int stackIndex);
SoDEPRECATED
  static const SoElement* getStackElement(SoState *state, int stackIndex);

#endif 
 private:
  // Constructor; use typeId.createInstance to create elements.
  SoElement();

  template<typename T>
  static T* getElement(SoState *state)
  {
    return static_cast<T*>(getElement(state, T::getClassTypeId(), T::getClassStackIndex()));
  }

  static SoElement* getElement(SoState *state, SoType type, int stackIndex);

  // Does whatever is necessary in state to capture this element for
  // caching purposes. Should be called by subclasses whenever
  // any value in the element is accessed.
  void capture(SoState *state) const
    { if (state->isCacheOpen()) captureThis(state); }

  // Really captures this element, once it has been determined that
  // a cache is open to capture it
  virtual void captureThis(SoState *state) const;

  // Sets typeId in instance
  void setTypeId(SoType id) { typeId = id; }

  // Returns next free element in a specific element stack
  SoElement* getNextFree() const { return nextFree; }

  inline void setPopped(SbBool flag) { m_popped = (flag == TRUE); }
  inline SbBool isPopped() const { return m_popped ; }

  static int getClassStackIndex();

#if 1             SoDEPRECATED
  static SoElement* getElement(SoState *state, int stackIndex);

#endif 
 SoINTERNAL private:
  // Creates and returns a new stack index
  static int createStackIndex(SoType id);

  SoElement* insertAtDepth(SoElement* elt, int depth);
  SoElement* replaceElement(SoState* state, SoElement* oldElt, SoElement* newElt);

 private:
  void updateNextInStackAndFree(SoElement* oldElt, SoElement* newElt);

  // nextInStack and nextFree are the pointers in a doubly-linked
  // list for each stack in the state.  nextInStack points toward
  // the bottom of the stack and nextFree points toward the top of
  // the stack.  Once a stack has been fully allocated, pushing
  // becomes simply following the nextFree pointer and popping
  // becomes following the nextInStack pointer.

  SoElement           *nextInStack;   // Next element of same type on stack
  SoElement           *nextFree;      // Next free element
  SoElement           *next;          // Next element in all-element

  static int         classStackIndex;  // Stack index for SoElement class

  // Stack index stuff
  static int         nextStackIndex;  // Next stack index to allocate

  static SoTypeList  *stackToType;    // Correlates stack index to type id
  int                 stackIndex;     // Stack index for instance
  int                 depth;          // Stack depth of element

  // Type identifier stuff
  static SoType      classTypeId;     // Type identifier for SoElement class
  SoType              typeId;         // Type identifier for instance

  // Other per-instance stuff
  // stack
  unsigned short    m_popPriority ; // Stores the pop priority.
  bool              m_popped ;      // Indicates if the element has been popped.

  friend class SoState;
  friend class SoCache;
  friend class SoBoundingBoxCache;
  friend class SoGLCacheListImpl;
  friend class SoGLViewingMatrixElement;
};

#endif /* _SO_ELEMENT */

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Open Inventor Toolkit reference manual, generated on 22 Jul 2025
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