SoEventCallback.h

#ifndef COIN_SOEVENTCALLBACK_H
#define COIN_SOEVENTCALLBACK_H

/**************************************************************************\
 * Copyright (c) Kongsberg Oil & Gas Technologies AS
 * All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
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 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
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#include <Inventor/nodes/SoSubNode.h>
#include <Inventor/lists/SbList.h>

#ifndef COIN_INTERNAL
// Added for Inventor compliance
#include <Inventor/actions/SoHandleEventAction.h>
#endif // !COIN_INTERNAL

class SoEventCallback;
class SoPath;
class SoEvent;
class SoPickedPoint;
class SoHandleEventAction;

typedef void SoEventCallbackCB(void * userdata, SoEventCallback * node);

class COIN_DLL_API SoEventCallback : public SoNode {
  typedef SoNode inherited;

  SO_NODE_HEADER(SoEventCallback);

public:
  static void initClass(void);
  SoEventCallback(void);

  void setPath(SoPath * path);
  const SoPath * getPath(void);

  void addEventCallback(SoType eventtype, SoEventCallbackCB * f,
                        void * userdata = NULL);
  void removeEventCallback(SoType eventtype, SoEventCallbackCB * f,
                           void * userdata = NULL);

  SoHandleEventAction * getAction(void) const;
  const SoEvent * getEvent(void) const;
  const SoPickedPoint * getPickedPoint(void) const;

  void setHandled(void);
  SbBool isHandled(void) const;

  void grabEvents(void);
  void releaseEvents(void);

protected:
  virtual ~SoEventCallback();

  virtual void handleEvent(SoHandleEventAction * action);

private:

  struct CallbackInfo {
    SoEventCallbackCB * func;
    SoType eventtype;
    void * userdata;

    // AIX native compiler xlC needs equality and inequality operators
    // to compile templates where these operators are referenced (even
    // if they are actually never used).

    SbBool operator==(const CallbackInfo & cbi) {
      return this->func == cbi.func && this->eventtype == cbi.eventtype && this->userdata == cbi.userdata;
    }
    SbBool operator!=(const CallbackInfo & cbi) {
      return !(*this == cbi);
    }
  };

  SbList<CallbackInfo> callbacks;
  SoHandleEventAction * heaction;
  SoPath * path;

};

#endif // !COIN_SOEVENTCALLBACK_H