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# SoEventCallback.h

    00001 #ifndef COIN_SOEVENTCALLBACK_H
    00002 #define COIN_SOEVENTCALLBACK_H
    00003
    00004 /**************************************************************************\
    00005  *
    00006  *  This file is part of the Coin 3D visualization library.
    00007  *  Copyright (C) 1998-2003 by Systems in Motion.  All rights reserved.
    00008  *
    00009  *  This library is free software; you can redistribute it and/or
    00010  *  modify it under the terms of the GNU General Public License
    00011  *  ("GPL") version 2 as published by the Free Software Foundation.
    00012  *  See the file LICENSE.GPL at the root directory of this source
    00013  *  distribution for additional information about the GNU GPL.
    00014  *
    00015  *  For using Coin with software that can not be combined with the GNU
    00016  *  GPL, and for taking advantage of the additional benefits of our
    00017  *  support services, please contact Systems in Motion about acquiring
    00018  *  a Coin Professional Edition License.
    00019  *
    00020  *  See <URL:http://www.coin3d.org> for  more information.
    00021  *
    00022  *  Systems in Motion, Teknobyen, Abels Gate 5, 7030 Trondheim, NORWAY.
    00023  *  <URL:http://www.sim.no>.
    00024  *
    00025 \**************************************************************************/
    00026
    00027 #include <Inventor/nodes/SoSubNode.h>
    00028 #include <Inventor/lists/SbList.h>
    00029
    00030 #ifndef COIN_INTERNAL
    00031 // Added for Inventor compliance
    00032 #include <Inventor/actions/SoHandleEventAction.h>
    00033 #endif // !COIN_INTERNAL
    00034
    00035 class SoEventCallback;
    00036 class SoPath;
    00037 class SoEvent;
    00038 class SoPickedPoint;
    00039 class SoHandleEventAction;
    00040
    00041 typedef void SoEventCallbackCB(void * userdata, SoEventCallback * node);
    00042
    00043 class COIN_DLL_API SoEventCallback : public SoNode {
    00044   typedef SoNode inherited;
    00045
    00046   SO_NODE_HEADER(SoEventCallback);
    00047
    00048 public:
    00049   static void initClass(void);
    00050   SoEventCallback(void);
    00051
    00052   void setPath(SoPath * path);
    00053   const SoPath * getPath(void);
    00054
    00055   void addEventCallback(SoType eventtype, SoEventCallbackCB * f,
    00056                         void * userdata = NULL);
    00057   void removeEventCallback(SoType eventtype, SoEventCallbackCB * f,
    00058                            void * userdata = NULL);
    00059
    00060   SoHandleEventAction * getAction(void) const;
    00061   const SoEvent * getEvent(void) const;
    00062   const SoPickedPoint * getPickedPoint(void) const;
    00063
    00064   void setHandled(void);
    00065   SbBool isHandled(void) const;
    00066
    00067   void grabEvents(void);
    00068   void releaseEvents(void);
    00069
    00070 protected:
    00071   virtual ~SoEventCallback();
    00072
    00073   virtual void handleEvent(SoHandleEventAction * action);
    00074
    00075 private:
    00076
    00077   struct CallbackInfo {
    00078     SoEventCallbackCB * func;
    00079     SoType eventtype;
    00080     void * userdata;
    00081
    00082     // AIX native compiler xlC needs equality and inequality operators
    00083     // to compile templates where these operators are referenced (even
    00084     // if they are actually never used).
    00085
    00086     SbBool operator==(const CallbackInfo & cbi) {
    00087       return this->func == cbi.func && this->eventtype == cbi.eventtype && this->userdata == cbi.userdata;
    00088     }
    00089     SbBool operator!=(const CallbackInfo & cbi) {
    00090       return !(*this == cbi);
    00091     }
    00092   };
    00093
    00094   SbList<CallbackInfo> callbacks;
    00095   SoHandleEventAction * heaction;
    00096   SoPath * path;
    00097
    00098 };
    00099
    00100 #endif // !COIN_SOEVENTCALLBACK_H