127 lines
3.5 KiB
C++
127 lines
3.5 KiB
C++
/*****************************************************************************
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*
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* (C) COPYRIGHT MICROSOFT CORPORATION, 2000
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*
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* TITLE: w32utils.inl
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*
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* VERSION: 1.0
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*
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* AUTHOR: LazarI
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*
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* DATE: 23-Dec-2000
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*
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* DESCRIPTION: Win32 templates & utilities (Impl.)
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*
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*****************************************************************************/
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////////////////////////////////////////////////
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//
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// class CSimpleWndSubclass
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//
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// class implementing simple window subclassing
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// (Windows specific classes)
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//
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template <class inheritorClass>
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inline BOOL CSimpleWndSubclass<inheritorClass>::IsAttached() const
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{
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return (NULL != m_hwnd);
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}
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template <class inheritorClass>
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BOOL CSimpleWndSubclass<inheritorClass>::Attach(HWND hwnd)
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{
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if( hwnd )
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{
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// make sure we are not attached and nobody is using
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// GWLP_USERDATA for something else already.
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ASSERT(NULL == m_hwnd);
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ASSERT(NULL == m_wndDefProc);
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ASSERT(NULL == GetWindowLongPtr(hwnd, GWLP_USERDATA));
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// attach to this window
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m_hwnd = hwnd;
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m_wndDefProc = reinterpret_cast<WNDPROC>(GetWindowLongPtr(m_hwnd, GWLP_WNDPROC));
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// thunk the window proc
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SetWindowLongPtr(m_hwnd, GWLP_USERDATA, reinterpret_cast<LONG_PTR>(this));
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SetWindowLongPtr(m_hwnd, GWLP_WNDPROC, reinterpret_cast<LONG_PTR>(_ThunkWndProc));
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return TRUE;
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}
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return FALSE;
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}
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template <class inheritorClass>
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BOOL CSimpleWndSubclass<inheritorClass>::Detach()
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{
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if( m_hwnd )
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{
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// unthunk the window proc
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SetWindowLongPtr(m_hwnd, GWLP_WNDPROC, reinterpret_cast<LONG_PTR>(m_wndDefProc));
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SetWindowLongPtr(m_hwnd, GWLP_USERDATA, 0);
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// clear out our data
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m_wndDefProc = NULL;
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m_hwnd = NULL;
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return TRUE;
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}
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return FALSE;
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}
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template <class inheritorClass>
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LRESULT CALLBACK CSimpleWndSubclass<inheritorClass>::_ThunkWndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
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{
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// get the pThis ptr from GWLP_USERDATA
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CSimpleWndSubclass<inheritorClass> *pThis =
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reinterpret_cast<CSimpleWndSubclass<inheritorClass>*>(GetWindowLongPtr(hwnd, GWLP_USERDATA));
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// must be attached
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ASSERT(pThis->IsAttached());
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// static cast pThis to inheritorClass
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inheritorClass *pTarget = static_cast<inheritorClass*>(pThis);
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// messsage processing is here
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if( WM_NCDESTROY == uMsg )
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{
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// this window is about to go away - detach.
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LRESULT lResult = pTarget->WindowProc(hwnd, uMsg, wParam, lParam);
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pThis->Detach();
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return lResult;
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}
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else
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{
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// invoke the inheritorClass WindowProc (should be defined)
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return pTarget->WindowProc(hwnd, uMsg, wParam, lParam);
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}
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}
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template <class inheritorClass>
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inline LRESULT CSimpleWndSubclass<inheritorClass>::WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
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{
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return DefWindowProc(hwnd, uMsg, wParam, lParam);
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}
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template <class inheritorClass>
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inline LRESULT CSimpleWndSubclass<inheritorClass>::DefWindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
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{
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if( m_wndDefProc )
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{
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return CallWindowProc(m_wndDefProc, hwnd, uMsg, wParam, lParam);
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}
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return ::DefWindowProc(hwnd, uMsg, wParam, lParam);
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}
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template <class inheritorClass>
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inline LRESULT CSimpleWndSubclass<inheritorClass>::DefDlgProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
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{
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if( m_wndDefProc )
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{
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return CallWindowProc(m_wndDefProc, hwnd, uMsg, wParam, lParam);
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}
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return ::DefDlgProc(hwnd, uMsg, wParam, lParam);
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}
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