在《
多标签视图类CTabView的设计实现》一文中,CTabView从CBasicSubClassWnd私有继承,重写其虚函数SubWindowProc,捕获WM_DRAWITEM和TTN_GETDISPINFO消息,从而实现了DrawItem和UpdateTooltipText虚函数回调机制,支持派生类的自定义处理,而CBasicSubClassWnd就是一个子类化窗口类,其原理很简单,就是挂钩替换目标窗口的消息处理过程,这里的设计实现为对于同一目标窗口,可以被多个CBasicSubClassWnd对象捕获消息,而一个CBasicSubClassWnd对象只能捕获一个目标窗口的消息,SubWindowProc返回值决定了消息是否被传递到下个CBasicSubClassWnd对象或原窗口过程处理,TRUE表示允许消息被传递,否则,反之。CBasicSubClassWnd类基于api + stl实现,简单易用,但不尽完善,比如没考虑支持不同进程间的窗口捕获、类的线程安全性等,这些东西都有待于进一步的解决。下面直接看看它的实现代码
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//basic_subclasswnd.h
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#ifndef _BASIC_SUBCLASSWND_H
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#define _BASIC_SUBCLASSWND_H
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#include <map>
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#include <list>
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class CBasicSubClassWnd
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{
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friend class CBasicWndInfo;
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public:
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CBasicSubClassWnd();
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void Hook(HWND hWnd);
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void Unhook();
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protected:
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virtual BOOL SubWindowProc(UINT msg,WPARAM wParam,LPARAM lParam);
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private:
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HWND m_hWnd;
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};
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class CBasicWndInfo
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{
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typedef std::list<CBasicSubClassWnd*> CBasicSubClassWndList;
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friend class CBasicSubClassWnd;
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private:
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CBasicWndInfo(HWND hWnd);
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void Add(CBasicSubClassWnd* pHandler);
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void Remove(CBasicSubClassWnd* pHandler);
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void RemoveAll();
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typedef std::map<HWND,CBasicWndInfo> CBasicSubClassWndMap;
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typedef CBasicSubClassWndMap::iterator MapIter;
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static CBasicSubClassWndMap& GetHookMap();
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static LRESULT HookWndProc(HWND hWnd,UINT uMsg,WPARAM wParam,LPARAM lParam);
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CBasicSubClassWndList m_list_scw;
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WNDPROC m_oldWndProc;
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HWND m_hWnd;
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};
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#endif
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//basic_subclasswnd.cpp
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#include "stdafx.h"
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#include "basic_subclasswnd.h"
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using namespace std;
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CBasicSubClassWnd::CBasicSubClassWnd()
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:m_hWnd(NULL)
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{
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}
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void CBasicSubClassWnd::Hook(HWND hWnd)
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{
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assert(hWnd);
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if (m_hWnd&&m_hWnd!=hWnd)
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Unhook();
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m_hWnd = hWnd;
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CBasicWndInfo::MapIter iter = CBasicWndInfo::GetHookMap().find(hWnd);
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if (iter==CBasicWndInfo::GetHookMap().end())
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{
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iter = CBasicWndInfo::GetHookMap().insert(make_pair(hWnd,CBasicWndInfo(hWnd))).first;
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}
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iter->second.Add(this);
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}
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void CBasicSubClassWnd::Unhook()
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{
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assert(m_hWnd);
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CBasicWndInfo::MapIter iter = CBasicWndInfo::GetHookMap().find(m_hWnd);
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if (iter==CBasicWndInfo::GetHookMap().end())
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return;
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iter->second.Remove(this);
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}
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BOOL CBasicSubClassWnd::SubWindowProc(UINT msg,WPARAM wParam,LPARAM lParam)
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{
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return TRUE;
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}
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/**/////////////////////////////////////////////////////////////////////////////////////////////// 89
CBasicWndInfo::CBasicWndInfo(HWND hWnd)
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:m_oldWndProc(NULL)
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,m_hWnd(hWnd)
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{
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}
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void CBasicWndInfo::Add(CBasicSubClassWnd* pHandler)
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{
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if (NULL==m_oldWndProc)
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{
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m_oldWndProc = (WNDPROC)SetWindowLong(m_hWnd,GWL_WNDPROC,(LONG)HookWndProc);
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}
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m_list_scw.push_back(pHandler);
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}
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void CBasicWndInfo::Remove(CBasicSubClassWnd* pHandler)
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{
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m_list_scw.remove(pHandler);
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if (m_list_scw.empty())
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{
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assert(m_hWnd);
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SetWindowLong(m_hWnd,GWL_WNDPROC,(LONG)m_oldWndProc);
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}
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}
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void CBasicWndInfo::RemoveAll()
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{
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m_list_scw.clear();
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}
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CBasicWndInfo::CBasicSubClassWndMap& CBasicWndInfo::GetHookMap()
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{
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static CBasicSubClassWndMap s_map;
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return s_map;
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}
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LRESULT CBasicWndInfo::HookWndProc(HWND hWnd,UINT uMsg,WPARAM wParam,LPARAM lParam)
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{
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MapIter iter = GetHookMap().find(hWnd);
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for (CBasicSubClassWndList::iterator it=iter->second.m_list_scw.begin();it!=iter->second.m_list_scw.end();++it)
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{
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if (!(*it)->SubWindowProc(uMsg,wParam,lParam))
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return 0;
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}
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return ::CallWindowProc(iter->second.m_oldWndProc,hWnd,uMsg,wParam,lParam);
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}
posted on 2011-12-11 11:07
春秋十二月 阅读(2289)
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