Inventor/misc/SoState.h

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/*=======================================================================
** Author      : Paul S. Strauss (MMM yyyy)
**=======================================================================*/
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**=======================================================================*/
/*=======================================================================
** Modified by : VSG (MMM YYYY)
**=======================================================================*/

#ifndef  _SO_STATE_
#define  _SO_STATE_

#include <Inventor/SoLists.h>

class SoAction;
class SoElement;

// SoState {
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:

  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; }

  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
  {
    if ( !m_stack )
      return NULL;
    enableMissingElement(type, stackIndex, checkType);
    return m_stack[stackIndex];
  }

  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();

  void checkStateConsistency();

  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_usingGLAction;

  static int s_checkStateConsistency;
  static int s_displayStateElements;
  static int s_checkStateElementsType;
  static bool s_printStateDepth;
  static FILE* s_stateDepthFile;
};

#endif  /* _SO_STATE_ */

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Open Inventor Toolkit reference manual, generated on 12 Feb 2024
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