SoChildList.h

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/*=======================================================================
** Author      : Paul S. Strauss (MMM yyyy)
**=======================================================================*/
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**=======================================================================*/
/*=======================================================================
** Modified by : VSG (MMM YYYY)
**=======================================================================*/
 
 
#ifndef _SO_CHILD_LIST_
#define _SO_CHILD_LIST_
 
#include <Inventor/SoLists.h>
#include <Inventor/threads/SbThreadMutex.h>
#include <Inventor/sensors/SoDataSensor.h>
 
 
//
//  Class: SoChildList
//
//  This class maintains a list of child nodes for any node. It allows
//  children to be added, removed, replaced, and accessed. The SoGroup
//  class has an instance of this class and provides public methods
//  for dealing with children. Other classes can also have an instance
//  of this class and may choose to publicize whatever methods they
//  wish for dealing with them. The SoNode::getChildren() method
//  returns the child list for any node class.
//
//  SoChildList automatically maintains the auditor list for parent
//  nodes. That is, when a child is added to the list, the parent node
//  is automatically added as a parent auditor of the child. To make
//  this possible, the parent node must be passed in to the
//  constructors of the SoChildList class.
//
 
class SoAction;
class AuditorsContainer;
{
 public:
  // Constructors and destructor.
  SoChildList(SoNode *parentNode);
  SoChildList(SoNode *parentNode, int size);
  SoChildList(SoNode *parentNode, const SoChildList &l);
  virtual ~SoChildList();
 
  // All of these override the standard SoBaseList methods so they
  // can maintain auditors correctly.
  void append(SoNode * child);
  void insert(SoNode *child, int addBefore);
  void remove(int which);
  void truncate(int start);
  void copy(const SoChildList &l);
  void set(int i, SoNode *child);
 
  // Traverses all children to apply action. Stops if action's
  // termination condition is reached
  void traverse(SoAction *action);
 
  // Traverses just one child
  void traverse(SoAction *action, int childIndex)
  { traverse(action, childIndex, childIndex); }
 
  // Traverses all children between two indices, inclusive. Stops if
  // action's termination condition is reached.
  void traverse(SoAction *action, int firstChild, int lastChild);
 
  // Traverses just one node
  void traverse(SoAction *action, SoNode *node);
 
  // multi-instance traversals
  // Traverses all children to apply action. Stops if action's
  // termination condition is reached for one instance
  void traverseMI(SoAction *action, int instanceIndex);
 
  // Traverses just one child with multi instancing
  void traverseMI( SoAction *action, int childIndex, int numInstances )
  { traverseMI(action, childIndex, childIndex, numInstances); }
  
  // Traverses all children between two indices, inclusive. Stops if
  // action's termination condition is reached.
  void traverseMI(SoAction *action, int firstChild, int lastChild, int instanceIndex );
 
  // Traverses just one node
  void traverseMI(SoAction *action, SoNode *node, int instanceIndex );
 
 private:
  // SoPath calls these to be notified of changes in scene graph
  // topology:
  // moved to the .cxx
  void addPathAuditor(SoPath *p);
  void removePathAuditor(SoPath *p);
  void removeAllPathAuditor();
  static void exitClass();
 
private:
 
  // Inner clas that describes current notification info details.
  class  SoChildNotificationInfo 
  {
  public:
    // Constructor.
    SoChildNotificationInfo()
    {
      reset();
    }
    // reset current notification details.
    inline void reset()
    {
      m_changedChild = NULL;
      m_changedIndex = -1;
      m_changeType = SoDataSensor::UNSPECIFIED;
    }
    // set current notification infos.
    inline void set(SoNode* changedChild, const int changedIndex, const SoDataSensor::ChangeType changeType)
    {
      m_changedChild = changedChild;
      m_changedIndex = changedIndex;
      m_changeType = changeType;
    }
    // Basic accessors
    inline SoNode* getChangedChild() const 
    { return m_changedChild; }
    int getChangedIndex() const
    { return m_changedIndex; }
    SoDataSensor::ChangeType getChangeType() const
    { return m_changeType;}
 
  private:
    // pointer on the changed child
    SoNode* m_changedChild;
    // index of the changed child
    int m_changedIndex;
    // current type of changed
    SoDataSensor::ChangeType m_changeType;
  };
 
  SoNode* parent;
  // This is a container of SoPath* and not a PathList because PathList ref()s the
  // paths it contains, and that screws up Path reference counting.
  AuditorsContainer *m_auditors;
 
  // Returns details of change (only valid during notification)
  const SoChildNotificationInfo& getChildNotificationInfo() const
  { return m_childNotificationInfo; }
 
  // keep track of last change during notification process
  SoChildNotificationInfo m_childNotificationInfo;
 
  friend class SoNode;
  friend class SoDataSensor;
};
 
#endif /* _SO_CHILD_LIST_ */