SoEventCallback.h

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**=======================================================================*/
/*=======================================================================
** Author      : David Mott (MMM yyyy)
**=======================================================================*/
/*=======================================================================
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**=======================================================================*/
/*=======================================================================
** Modified by : VSG (MMM YYYY)
**=======================================================================*/
 
 
#ifndef  _SO_EVENT_CALLBACK_
#define  _SO_EVENT_CALLBACK_
 
#include <Inventor/misc/SoCallbackList.h>
#include <Inventor/SoPath.h>
#include <Inventor/nodes/SoNode.h>
#include <Inventor/actions/SoHandleEventAction.h>
 
class SoEvent;
class SoEventCallback;
 
// callback function prototypes
typedef void SoEventCallbackCB(void *userData, SoEventCallback *node);
 
//
//  Class: SoEventCallback
//
 
class  SoEventCallback : public SoNode {
 
  SO_NODE_HEADER(SoEventCallback);
 
 public:
  SoEventCallback();
    
  void                setPath(SoPath *path);
  const SoPath *      getPath()               { return pathOfInterest; }
 
  void                addEventCallback(SoType eventType,
                                       SoEventCallbackCB *f,
                                       void *userData = NULL);
 
  template<typename EventType>
  void addEventCallback( SoEventCallbackCB* f, void* userData = nullptr )
  {
    addEventCallback( EventType::getClassTypeId(), f, userData );
  }
 
  void                removeEventCallback(SoType eventType,
                                          SoEventCallbackCB *f,
                                          void *userData = NULL);
 
  template<typename EventType>
  void removeEventCallback( SoEventCallbackCB* f, void* userData = nullptr )
  {
    removeEventCallback( EventType::getClassTypeId(), f, userData );
  }
 
  //
  // These all provide information to callback functions. They
  // return NULL when called from anywhere but a callback function.
  //
    
  SoHandleEventAction *       getAction() const { return eventAction; }
 
  const SoEvent *             getEvent() const
    { return (eventAction != NULL ? eventAction->getEvent() : NULL); }
 
  const SoPickedPoint *       getPickedPoint() const
    { return (eventAction != NULL ? eventAction->getPickedPoint() : NULL);}
    
  //
 
  void                setHandled()
    { if (eventAction != NULL) eventAction->setHandled(); }
 
  SbBool              isHandled() const
    { return (eventAction != NULL) ? eventAction->isHandled() : FALSE; }
    
  void                grabEvents()
    { if (eventAction != NULL) eventAction->setGrabber(this); }
 
  void                releaseEvents()
    { if (eventAction != NULL) eventAction->releaseGrabber(); }
 
 private:
  // This will be called during handleEventAction traversal.
  virtual void        handleEvent(SoHandleEventAction *ha);
 
 private:
  static void         initClass();    // initialize the class
  static void         exitClass();
 
 private:
  // Destructor - protected since ref/unref is what should destroy this
  virtual ~SoEventCallback();
    
 private:
  // Only invoke callbacks if this path was picked.
  // If path is NULL, always invoke callbacks.
  SoPath              *pathOfInterest;
    
  // List of callback functions, event types, and user data.
  SbPList *           cblist;
    
  // This is set for each SoHandleEventAction traversal of this node
  // so that the apps callback routine can invoke methods on the action.
  SoHandleEventAction *eventAction;
};
 
#endif /* _SO_EVENT_CALLBACK_ */