www.pudn.com > SCIDE.rar > Subclass.h

//////////////////////////////////////////////////////////////// 
// PixieLib(TM) Copyright 1997-1998 Paul DiLascia 
// If this code works, it was written by Paul DiLascia. 
// If not, I don't know who wrote it. 
// 
#ifndef _SUBCLASSW_H 
#define _SUBCLASSW_H 
 
////////////////// 
// Generic class to hook messages on behalf of a CWnd. 
// Once hooked, all messages go to CSubclassWnd::WindowProc before going 
// to the window. Specific subclasses can trap messages and do something. 
// 
// To use: 
// 
// * Derive a class from CSubclassWnd. 
// 
// * Override CSubclassWnd::WindowProc to handle messages. Make sure you call 
//   CSubclassWnd::WindowProc if you don't handle the message, or your 
//   window will never get messages. If you write seperate message handlers, 
//   you can call Default() to pass the message to the window. 
// 
// * Instantiate your derived class somewhere and call HookWindow(pWnd) 
//   to hook your window, AFTER it has been created. 
//	  To unhook, call HookWindow(NULL). 
// 
// This is a very important class, crucial to many of the widgets Window 
// widgets implemented in PixieLib. To see how it works, look at the HOOK 
// sample program. 
// 
class /*AFX_EXT_CLASS*/ CSubclassWnd : public CObject { 
public: 
	DECLARE_DYNAMIC(CSubclassWnd); 
	CSubclassWnd(); 
	~CSubclassWnd(); 
 
	// Subclass a window. Hook(NULL) to unhook (automatic on WM_NCDESTROY) 
	BOOL	HookWindow(HWND  hwnd); 
	BOOL	HookWindow(CWnd* pWnd)	{ return HookWindow(pWnd->GetSafeHwnd()); } 
	BOOL	IsHooked()					{ return m_hWnd!=NULL; } 
 
	friend LRESULT CALLBACK HookWndProc(HWND, UINT, WPARAM, LPARAM); 
	friend class CSubclassWndMap; 
 
#ifdef _DEBUG 
	virtual void AssertValid() const; 
	virtual void Dump(CDumpContext& dc) const; 
#endif 
 
protected: 
	HWND				m_hWnd;				// the window hooked 
	WNDPROC			m_pOldWndProc;		// ..and original window proc 
	CSubclassWnd*	m_pNext;				// next in chain of hooks for this window 
 
	// Override this to handle messages in specific handlers 
	virtual LRESULT WindowProc(UINT msg, WPARAM wp, LPARAM lp); 
	LRESULT Default();				// call this at the end of handler fns 
}; 
 
#endif // _SUBCLASSW_H