DUILIB::UIDelegate.h—的注释和理解
废话不多说,直接上 代码注释;以下代码来源于DUILIB
#ifndef __UIDELEGATE_H__
#define __UIDELEGATE_H__
#pragma once
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class DUILIB_API CDelegateBase
{
public:
CDelegateBase(void* pObject, void* pFn);
CDelegateBase(const CDelegateBase& rhs);
virtual ~CDelegateBase();
bool Equals(const CDelegateBase& rhs) const;
bool operator() (void* param);
virtual CDelegateBase* Copy() const = 0;
protected:
void* GetFn();
void* GetObject();
virtual bool Invoke(void* param) = 0;
private:
void* m_pObject;
void* m_pFn;
};
class CDelegateStatic: public CDelegateBase
{
typedef bool (*Fn)(void*);
public:
//构造函数指针
CDelegateStatic(Fn pFn) : CDelegateBase(NULL, pFn) { }
CDelegateStatic(const CDelegateStatic& rhs) : CDelegateBase(rhs) { }
virtual CDelegateBase* Copy() const { return new CDelegateStatic(*this); }
protected:
virtual bool Invoke(void* param)
{
Fn pFn = (Fn)GetFn();
return (*pFn) (param);
}
};
template <class O, class T>
class CDelegate : public CDelegateBase
{
typedef bool (T::* Fn)(void*);
public:
CDelegate(O* pObj, Fn pFn) : CDelegateBase(pObj, *(void**)&pFn) { }
CDelegate(const CDelegate& rhs) : CDelegateBase(rhs) { }
virtual CDelegateBase* Copy() const { return new CDelegate(*this); }
protected:
virtual bool Invoke(void* param)
{
O* pObject = (O*) GetObject();
union
{
void* ptr;
Fn fn;
} func = { GetFn() };
return (pObject->*func.fn)(param);
}
private:
Fn m_pFn;
};
template <class O, class T>
CDelegate<O, T> MakeDelegate(O* pObject, bool (T::* pFn)(void*))
inline CDelegateStatic MakeDelegate(bool )
class DUILIB_API CEventSource
{
typedef bool (*FnType)(void*);
public:
~CEventSource();
operator bool();
void operator+= (const CDelegateBase& d);
void operator+= (FnType pFn);
void operator-= (const CDelegateBase& d);
void operator-= (FnType pFn);
bool operator() (void* param);
protected:
CDuiPtrArray m_aDelegates;
};