source: cpp/gdk/callbacks.h @ 105

// This file is a part of the Framsticks GDK library.
// Copyright (C) 2002-2011  Szymon Ulatowski.  See LICENSE.txt for details.
// Refer to http://www.framsticks.com/ for further information.

#ifndef _CALLBACKS_H_
#define _CALLBACKS_H_

#include "list.h"
#include "statrick.h"

//#define USEMEMBERCALLBACK

class CallbackNode
{
public:
virtual ~CallbackNode() {}
virtual void action(long calldata)=0;
virtual int equals(CallbackNode*n) {return (this==n);}
};

#ifdef USEMEMBERCALLBACK
class CallBase;
class MemberCallbackNode :public CallbackNode
{
void *userdata;
CallBase *object;
void (CallBase::*member)(void*,long);
  public:
MemberCallbackNode(CallBase *o,void (CallBase::*m)(void*,long),void *d):object(o),member(m),userdata(d) {}
void action(long calldata) {(object->*member)(userdata,calldata);}
int equals(CallbackNode*);
};
#define MEMBERCALLBACK(obj,mem,dat) new MemberCallbackNode((CallBase*)(obj),(void (CallBase::*)(void*,long))(mem),(void*)(dat))
#endif

class FunctionCallbackNode :public CallbackNode
{
void *userdata;
void (*fun)(void*,long);
  public:
FunctionCallbackNode(void (*f)(void*,long),void *d):userdata(d),fun(f) {}
void action(long calldata) {(*fun)(userdata,calldata);}
int equals(CallbackNode*);
};
#define FUNCTIONCALLBACK(fun,dat) new FunctionCallbackNode((void (*)(void*,long))(fun),(void*)(dat))

class StatrickCallbackNode :public CallbackNode
{
void *object;
void *userdata;
void (*fun)(void*,void*,long);
  public:
StatrickCallbackNode(void *o,void (*f)(void*,void*,long),void *d):object(o),userdata(d),fun(f) {}
void action(long calldata) {(*fun)(object,userdata,calldata);}
int equals(CallbackNode*);
};
#define STATRICKCALLBACK(obj,name,dat) new StatrickCallbackNode((void*)(obj),(void (*)(void*,void*,long))STATRICKNAME(name),(void*)(dat))

/**
   Like in old 'DuoList' you can register for an event giving function pointer
      add(Function* fun, void* anydata)
   'fun' will be called with your pointer as the first argument (void*)
   and event specific value as the second argument (long)
      fun(void* anydata,long eventdata)

   'StatrickCallbackNode' uses static functions to emulate object member calls.
   @see statrick.h
   
   Unregistering callbacks:
   The old remove(...) still works, but removeNode() is more efficient.
   To use it you have to store what you get from add(...);
      CallbackNode* node=thelist.l_add.add(&fun,data);
      // thelist.l_add.remove(&fun,data);
      thelist.l_add.removeNode(node); // this is better!

 */

class Callback: protected SList
{
public:
~Callback();
CallbackNode* add(CallbackNode*n);
CallbackNode* add(void (*f)(void*,long),void *d)
        {return add(new FunctionCallbackNode(f,d));}
void remove(void (*f)(void*,long),void *d)
        {remove(new FunctionCallbackNode(f,d));}
void remove(CallbackNode*n);
void removeNode(CallbackNode*n);
void operator+=(void* fun) {add((void (*)(void*,long))fun,0);}
void operator-=(void* fun) {remove((void (*)(void*,long))fun,0);}
void action(long data);
void action() {action(0);}
int size() {return SList::size();}
void clear() {SList::clear();}
};

///////////////////

#define STCALLBACKDEF(name) STATRICKDEF2(name,void*,long)
#define STCALLBACKDEFC(cls,name) STATRICKSTUB2(cls,name,void*,long)  \
        void name(void* arg1,long arg2)
#define VIRTCALLBACKDEF(name) STATRICKSTUB2(STATRICKCLASS,name,void*,long)  \
        virtual void name(void* arg1,long arg2)
#define VIRTCALLBACKDEFC(cls,name) STATRICKSTUB2(cls,name,void*,long)  \
        virtual void name(void* arg1,long arg2)

/* STCALLBACKDEFC(Class,name)

     |
     v

   #define STATRICKCLASS Class
   STCALLBACKDEF(name)
   #undef STATRICKCLASS
 */

#define CALLBACKARGS void* arg1,long arg2

#endif