附：程序清单（本程序在MS VC++5.0和TC++3.0上均编译通过）
file://回调类的类结构:callback.h
#ifndef _CALLBACK_H
#define _CALLBACK_H
#include<stdlib.h>
#include<string.h>
#include<iostream.h>
#define CALLBACKLIST_INIT_SIZE 10
#define CALLBACKLIST_INCREMENT 5
class CallBack;
typedef void *CallData;//回调数据指针类型定义
typedef void (CallBack::*CallBackFunction)(CallData); file://指向回调成员函数的指针
typedef void (*CallBackStaticFunction)(CallData); file://指向静态成员函数或普通函数的指针类型定义
class EventRecord{
private:
char *eventName; file://回调事件名称
CallBack *pointerToCBO;//指向回调对象的指针
file://指向成员函数的指针和指向静态成员函数（或普通函数）指针的共用体
union{
CallBackFunction pointerToCBF;
CallBackStaticFunction pointerToCBSF;
};
public:
EventRecord(void); file://事件记录类的缺省构造函数
file://构造包含成员函数的事件记录
EventRecord(char *ename,CallBack *pCBO,CallBackFunction pCBF);
file://构造包含静态成员函数或普通函数的事件记录
EventRecord(char *ename,CallBackStaticFunction pCBSF);
~EventRecord(void);//析构事件记录
void operator = (const EventRecord& er);//重载赋值运算符
file://判断当前事件记录的事件名是否为ename
int operator == (char *ename) const;
file://判断当前事件记录是否和指定事件记录相等
int operator == (const EventRecord& er) const;
void Flush(void); file://将当前事件记录清空
int IsEmpty(void) const;//判断事件记录是否为空（即事件名是否为空）
friend class CallBack; file://让CallBack类能访问EventRecord的私有成员；
};
class CallBack {
private:
EventRecord *callBackList; file://回调事件表
int curpos; file://当前事件记录位置
int lastpos; file://回调表中最后一空闲位置
int size; file://回调表的大小
void MoveFirst(void) { curpos = 0; }//将当前记录置为第一条记录
void MoveNext(void) file://将下一条记录置为当前记录
{
if(curpos == lastpos) return;
curpos++;
}
file://判断回调表是否被遍历完
int EndOfList(void) const { return curpos == lastpos; }
public:
CallBack(void);//构造函数
CallBack(const CallBack& cb);//拷贝构造函数
~CallBack(void);//析构函数
void operator = (const CallBack& cb);// 重载赋值运算符
file://将回调对象的成员函数、静态成员函数（或普通函数） file://注册为事件对象的回调函数
void AddCallBack(char *event,CallBackFunction cbf,CallBack *p);
void AddCallBack(char *event,CallBackStaticFunction cbsf);
file://删除注册在指定事件上的回调函数
void RemoveCallBack(char *event,CallBackFunction cbf,CallBack *p);
void RemoveCallBack(char *event,CallBackStaticFunction cbsf);
void RemoveCallBack(char *event);// 删除某事件的全部记录
file://执行注册在某一事件上的所有回调函数
void CallCallBack(char *event, CallData calldata = NULL);
};
#endif
file://回调类的实现:callback.cpp
#include"callback.h"
file://EventRecord类的实现
EventRecord::EventRecord(void)
{
eventName = NULL;
pointerToCBO = NULL;
file://因为sizeof(CallBackFunction) > sizeof(CallBackStaticFunction)
pointerToCBF = NULL;
}
EventRecord::EventRecord(char *ename, CallBack *pCBO, CallBackFunction pCBF)
:pointerToCBO(pCBO), pointerToCBF(pCBF)
{
eventName = strdup(ename);
}
EventRecord::EventRecord(char *ename, CallBackStaticFunction pCBSF)
:pointerToCBO(NULL), pointerToCBSF(pCBSF)
{
eventName = strdup(ename);
}
EventRecord::~EventRecord(void)
{
if(eventName) delete eventName;
}
void EventRecord::operator = (const EventRecord& er)
{
if(er.eventName)
eventName = strdup(er.eventName);
else
eventName = NULL;
pointerToCBO = er.pointerToCBO;
pointerToCBF = er.pointerToCBF;
}
int EventRecord::operator == (char *ename) const
{
if((eventName == NULL)||ename == NULL)
return eventName == ename;
else
return strcmp(eventName,ename) == 0;
}
int EventRecord::operator == (const EventRecord& er) const
{
return (er == eventName) /*er和eventname不能交换位置*/
&&(pointerToCBO == er.pointerToCBO)
&&(pointerToCBO ?
(pointerToCBF == er.pointerToCBF):
(pointerToCBSF == er.pointerToCBSF));
}
void EventRecord::Flush(void)
{
if(eventName){
delete eventName;
eventName = NULL;
}
pointerToCBO = NULL;
pointerToCBF = NULL;
}
int EventRecord::IsEmpty(void) const
{
if(eventName == NULL)
return 1;
else
return 0;
}
file://Callback类的实现
CallBack::CallBack(void)
{
file://按初始尺寸为回调表分配内存空间
callBackList = new EventRecord[CALLBACKLIST_INIT_SIZE];
if(!callBackList){
cerr<<"CallBack: memory allocation error."<<endl;
exit(1);
}
size = CALLBACKLIST_INIT_SIZE;
lastpos = 0;
curpos = 0;
}
CallBack::CallBack(const CallBack& cb): curpos(cb.curpos),lastpos(cb.lastpos),size(cb.size)
{
callBackList = new EventRecord[size];
if(!callBackList){
cerr<<"CallBack: memory allocation error."<<endl;
exit(1);
}
file://一一复制各条事件记录
for(int i = 0; i < size; i++) callBackList[i] = cb.callBackList[i];
}
void CallBack::operator = (const CallBack& cb)
{
curpos = cb.curpos;
lastpos = cb.lastpos;
size = cb.size;
delete [] callBackList;//删除旧的回调表
callBackList = new EventRecord[size];//重新分配内存空间
if(!callBackList){
cerr<<"CallBack: memory allocation error."<<endl;
exit(1);
}
file://一一复制各条事件记录
for(int i = 0; i < size; i++) callBackList[i] = cb.callBackList[i];
}
CallBack::~CallBack(void)
{
delete [] callBackList;
}
void CallBack::AddCallBack(char *event, CallBackFunction pCBF, CallBack *pCBO)
{
file://如事件名为空，退出
if( (event == NULL)?1:(strlen(event) == 0)) return;
file://寻找因删除事件记录而产生的第一个空闲位置，并填写新事件记录
for(int start=0;start<lastpos;start++)
if(callBackList[start].IsEmpty()){
callBackList[start] = EventRecord(event,pCBO,pCBF);
break;
}
if(start < lastpos) return; file://确实存在空闲位置
file://没有空闲位置，在回调表后追加新记录
if(lastpos == size) file://回调表已满，需“伸长”
{
EventRecord *tempList = callBackList;//暂存旧回调表指针
file://以一定的步长“伸长”回调表
callBackList = new EventRecord[size + CALLBACKLIST_INCREMENT];
if(!callBackList){
cerr<<"CallBack: memory allocation error."<<endl;
exit(1);
}
file://复制旧回调表中的记录
for(int i = 0; i < size; i++) callBackList[i] = tempList[i];
delete [] tempList;//删除旧回调表
size += CALLBACKLIST_INCREMENT;//记下新回调表的尺寸
}
file://构造新的事件记录并将其填入回调表中
callBackList[lastpos] = EventRecord(event,pCBO,pCBF);
lastpos++;
}
void CallBack::AddCallBack(char *event,CallBackStaticFunction pCBSF)
{
if( (event == NULL)?1:(strlen(event) == 0)) return;
for(int start=0;start<lastpos;start++)
if(callBackList[start].IsEmpty()){
callBackList[start] = EventRecord(event,pCBSF);
break;
}
if(start < lastpos) return; file://a hole is found
if(lastpos == size) file://event list is insufficient
{
EventRecord *tempList = callBackList;
callBackList = new EventRecord[size + CALLBACKLIST_INCREMENT];
if(!callBackList){
cerr<<"CallBack: memory allocation error."<<endl;
exit(1);
}
for(int i = 0; i < size; i++) callBackList[i] = tempList[i];
delete [] tempList;
size += CALLBACKLIST_INCREMENT;
}
callBackList[lastpos] = EventRecord(event,pCBSF);
lastpos++;
}
file://删除注册在指定事件上的成员函数
void CallBack::RemoveCallBack(char *event, CallBackFunction pCBF, CallBack *pCBO)
{
if( (event == NULL)?1:(strlen(event) == 0)) return;
EventRecord er(event,pCBO,pCBF);
for(int i = 0; i < lastpos; i++)
if(callBackList[i] == er) callBackList[i].Flush();
}
file://删除注册在指定事件上的静态成员函数或普通函数
void CallBack::RemoveCallBack(char *event,CallBackStaticFunction pCBSF)
{
if( (event == NULL)?1:(strlen(event) == 0)) return;
EventRecord er(event,pCBSF);
for(int i = 0; i < lastpos; i++)
if(callBackList[i] == er) callBackList[i].Flush();
}
file://删除注册在指定事件上的所有回调函数
void CallBack::RemoveCallBack(char *event)
{
if( (event == NULL)?1:(strlen(event) == 0)) return;
for(int i = 0; i < lastpos; i++)
if(callBackList[i] == event) callBackList[i].Flush();
}
void CallBack::CallCallBack(char *event, CallData callData)
{
if( (event == NULL)?1:(strlen(event) == 0)) return;
CallBack *pCBO;
CallBackFunction pCBF;
CallBackStaticFunction pCBSF;
MoveFirst();
while(!EndOfList())
{
file://如当前事件记录和指定事件不匹配，转入下一条记录继续循环
if(!(callBackList[curpos] == event))
{
MoveNext();
continue;
}
file://如找到匹配记录
pCBO = callBackList[curpos].pointerToCBO;
file://如事件记录中回调对象指针为空，说明该记录中保存的是静态函数指针
if(pCBO == NULL){
pCBSF = callBackList[curpos].pointerToCBSF;
pCBSF(callData);//调用该静态回调函数
}
else file://如事件记录中回调对象指针非空，说明该记录中保存的是成员函数指针
{
pCBF = callBackList[curpos].pointerToCBF;
(pCBO->*pCBF)(callData);// 调用该回调对象的成员函数
}
MoveNext();
}
} |
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