SoState.h

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**=======================================================================*/
/*=======================================================================
** Author      : Paul S. Strauss (MMM yyyy)
**=======================================================================*/
/*=======================================================================
 *** THE CONTENT OF THIS WORK IS PROPRIETARY TO FEI S.A.S, (FEI S.A.S.),            ***
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**=======================================================================*/
/*=======================================================================
** Modified by : VSG (MMM YYYY)
**=======================================================================*/
 
#ifndef  _SO_STATE_
#define  _SO_STATE_
 
#include <Inventor/SoLists.h>
 
class SoAction;
class SoElement;
 
SoEXTENDER_Documented class  SoState {
 
public:
  SoState(SoAction *action, const SoTypeList &enabledElements);
 
  ~SoState();
 
  inline SoAction* getAction() const
  { return m_action; }
 
  template<typename T>
  inline T* getElement()
  {
    return static_cast<T*>(getElement(T::getClassTypeId(), T::getClassStackIndex()));
  }
 
  SoElement* getElement(const SoType& type, const int stackIndex);
 
  template<typename T>
  inline const T* getConstElement() const
  {
    return static_cast<const T*>(getConstElement(T::getClassTypeId(), T::getClassStackIndex(), true));
  }
 
  inline const SoElement* getConstElement(const SoType& type, const int stackIndex) const
  {
    return getConstElement(type, stackIndex, false);
  }
 
  void push();
 
  void pop();
 
  void print(FILE *fp);
 
#if 1             SoDEPRECATED
  SoElement* getElement(const int stackIndex);SoDEPRECATED
  const SoElement* getConstElement(const int stackIndex) const;
 
#endif 
 private:
 
  class PushPop
  {
  public:
    PushPop(SoState* state) : m_state(state) { m_state->push(); }
    ~PushPop() { m_state->pop(); }
  private:
    SoState* m_state;
  };
 
 
  inline SbBool isElementEnabled(const SoType& type, const int stackIndex, SbBool checkType = TRUE) const
  {
    if ( !s_checkStateElementsType )
      return isElementEnabled(stackIndex);
    return isElementEnabledChecked(type,stackIndex,checkType);
  }
 
  // Returns TRUE if element with given stack index is enabled in state
  inline SbBool isElementEnabled(const int stackIndex) const
  {
    if (m_stack && (stackIndex < m_numStacks))
      return (m_stack[stackIndex] != NULL);
    else
      return FALSE;
  }
 
  // Returns current depth of state
  inline int getDepth() const
  { return m_depth; }
 
  // Sets/returns flag that indicates whether a cache is open. This
  // flag lets us optimize element capturing; we don't need to try
  // to capture elements if the flag is FALSE.
  inline void setCacheOpen(const SbBool flag)
  { m_cacheOpen = flag; }
 
  inline SbBool isCacheOpen() const
  { return m_cacheOpen; }
 
  inline bool trackDependencies(bool flag)
  {
    bool oldValue = m_trackElementsDependencies;
    m_trackElementsDependencies = flag;
    return oldValue;
  }
 
  bool isTrackingDependencies() const;
  
  template<typename T>
  inline T* getElementNoPush() const
  {
    return static_cast<T*>(getElementNoPush(T::getClassTypeId(), T::getClassStackIndex()));
  }
 
  inline SoElement* getElementNoPush(SoType type, const int stackIndex) const
  {
    return const_cast<SoElement*>(getConstElement(type, stackIndex, true));
  }
 
  // Internal-only.
  // Pops from the an element corresponding to classStackIndex.
  // Only the side effect of popping is done (ie. the element is not
  // removed from the stack).
  void popElement(const int classStackIndex) ;
 
  inline const SoElement* getConstElement(const SoType& type, const int stackIndex, bool checkType) const
  {
    //This method must be fast, it is called very often so avoid
    //testing for m_stask, it can't be NULL (set at contructor and deleted 
    //in destructor only)
    const SoElement* elt = stackIndex < m_numStacks ? m_stack[stackIndex] : NULL;
    if ( elt == NULL )
    {
      enableMissingElement(type, stackIndex, checkType);
      return m_stack[stackIndex];
    }
 
    return elt;
  }
 
  inline const SoElement* getTopElement() const { return m_topElement; }
 
  void insertElement( SoElement* );
 
#if 1             SoDEPRECATED
  SoElement* getElementNoPush(const int stackIndex) const;
 
#endif 
private:
 
  void enableSendToGL(bool enable);
 
  bool isSendToGLEnabled() const;
 
private:
 
  SbBool isElementEnabledChecked(const SoType& type, const int stackIndex, SbBool checkType = TRUE) const;
 
  SoType getBestElementType(const SoType& type) const;
 
  void createDepth0Element(int stackIndex);
 
  void displayStack(const char *funcStr);
 
  void checkStateConsistency(const char *funcStr);
 
  void enableMissingElement(const SoType& type, int stackIndex, bool checkType) const;
 
  SoAction            *m_action;        // Action instance state is in
  int                 m_depth;          // Current depth
  SoElement           **m_stack;        // Array of element stacks
  int                 m_numStacks;      // Number of stacks in array
  SoElement *         m_topElement;     // First element in threaded stack
 
  SbBool              m_cacheOpen;      // TRUE if a cache is open
  bool                m_enableSendToGL; // send to OpenGL activation flag
  bool m_trackElementsDependencies;
  
  bool m_actionNeedDependencies;
 
  bool m_usingGLAction;
 
  static int s_checkStateConsistency;
  static int s_displayStateElements;
  static int s_checkStateElementsType;
  static bool s_printStateDepth;
  static FILE* s_stateDepthFile;
};
 
#endif  /* _SO_STATE_ */