129 lines
3 KiB
C
129 lines
3 KiB
C
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/*--------------------------------------------------------------------------*
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*
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* Microsoft Windows
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* Copyright (C) Microsoft Corporation, 1992 - 1999
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*
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* File: subclass.h
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*
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* Contents: Interface file for the dynamic subclass manager
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*
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* History: 06-May-98 JeffRo Created
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*
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*--------------------------------------------------------------------------*/
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#ifndef __SUBCLASS_H__
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#define __SUBCLASS_H__
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#pragma once
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// remove the definition from windowsx.h that conflicts with declarations here
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#ifdef SubclassWindow
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#undef SubclassWindow
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#endif
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/*--------------------------------------------------------------------------*
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* CSubclasser
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*
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* Derive a class from this to implement subclassing the subclass manager
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* way.
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*--------------------------------------------------------------------------*/
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class CSubclasser
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{
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public:
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virtual ~CSubclasser() {}
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virtual LRESULT Callback (HWND& hwnd, UINT& msg, WPARAM& wParam,
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LPARAM& lParam, bool& fPassMessageOn) = 0;
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};
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/*----------------*/
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/* SubclasserData */
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/*----------------*/
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class SubclasserData
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{
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public:
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SubclasserData (CSubclasser* pSubclasser_ = NULL, HWND hwnd = NULL)
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: pSubclasser (pSubclasser_),
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hwnd (hwnd),
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cRefs (0),
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fZombie (false)
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{}
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UINT AddRef ()
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{ return (++cRefs); }
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UINT Release ()
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{ ASSERT (cRefs > 0); return (--cRefs); }
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bool operator==(const SubclasserData& other) const
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{ return (pSubclasser == other.pSubclasser); }
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bool operator<(const SubclasserData& other) const
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{ return (pSubclasser < other.pSubclasser); }
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CSubclasser* pSubclasser;
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private:
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friend class WindowContext;
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HWND hwnd;
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UINT cRefs;
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bool fZombie;
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};
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typedef std::list<SubclasserData> SubclasserList;
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typedef std::set< SubclasserData> SubclasserSet;
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/*---------------*/
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/* WindowContext */
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/*---------------*/
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class WindowContext
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{
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public:
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WindowContext() : pfnOriginalWndProc(NULL)
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{}
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bool IsZombie(const SubclasserData& subclasser) const;
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void Insert(SubclasserData& subclasser);
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UINT Remove(SubclasserData& subclasser);
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void RemoveZombies();
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SubclasserList Subclassers;
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WNDPROC pfnOriginalWndProc;
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private:
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void Zombie(SubclasserData& subclasser, bool fZombie);
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SubclasserSet Zombies;
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};
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/*------------------*/
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/* CSubclassManager */
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/*------------------*/
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class CSubclassManager
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{
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public:
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bool SubclassWindow (HWND hwnd, CSubclasser* pSubclasser);
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bool UnsubclassWindow (HWND hwnd, CSubclasser* pSubclasser);
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private:
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typedef std::map<HWND, WindowContext> ContextMap;
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ContextMap m_ContextMap;
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bool PhysicallyUnsubclassWindow (HWND hwnd, bool fForce = false);
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LRESULT SubclassProcWorker (HWND, UINT, WPARAM, LPARAM);
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static LRESULT CALLBACK SubclassProc (HWND, UINT, WPARAM, LPARAM);
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};
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CSubclassManager& GetSubclassManager();
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#endif /* __SUBCLASS_H__ */
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