Subclass.h
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上传日期:2010-02-13
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- ////////////////////////////////////////////////////////////////
- // VCKBASE -- August 2000
- // Compiles with Visual C++ 6.0, runs on Windows 98 and probably NT too.
- //
- #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 Unhook or 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 CSubclassWnd : public CObject {
- public:
- 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()); }
- void Unhook() { HookWindow((HWND)NULL); }
- BOOL IsHooked() { return m_hWnd!=NULL; }
- friend LRESULT CALLBACK HookWndProc(HWND, UINT, WPARAM, LPARAM);
- friend class CSubclassWndMap;
- virtual LRESULT WindowProc(UINT msg, WPARAM wp, LPARAM lp);
- LRESULT Default(); // call this at the end of handler fns
- #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
- DECLARE_DYNAMIC(CSubclassWnd);
- };
- #endif // _SUBCLASSW_H