Subclass.h
上传用户:shilei2004
上传日期:2020-07-18
资源大小:83k
文件大小:2k
- ////////////////////////////////////////////////////////////////
- // 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