ngsubclass.h

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////////////////////////////////////////////////////////////////
// 1999 Microsoft Systems Journal
// If this code works, it was written by Paul DiLascia.
// If not, I don't know who wrote it.
//
#ifndef _NGSUBCLASSW_H
#define _NGSUBCLASSW_H

//////////////////
// Generic class to hook messages on behalf of a CWnd.
// Once hooked, all messages go to CNGSubclassWnd::WindowProc before going
// to the window. Specific subclasses can trap messages and do something.
//
// To use:
//
// * Derive a class from CNGSubclassWnd.
//
// * Override CNGSubclassWnd::WindowProc to handle messages. Make sure you call
//   CNGSubclassWnd::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 NGLIB_EXT_CLASS CNGSubclassWnd : public CObject {
public:
	DECLARE_DYNAMIC(CNGSubclassWnd);
	CNGSubclassWnd();
	~CNGSubclassWnd();

	// 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 CNGSubclassWndMap;

#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
	CNGSubclassWnd*	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