90 lines
1.4 KiB
C++
90 lines
1.4 KiB
C++
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//
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// CWnd.cpp
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//
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// A super-simple window wrapper implementation.
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//
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// History:
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//
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// 10/07/1999 KenSh Created
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//
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#include "stdafx.h"
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#include "CWnd.h"
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CWnd::CWnd()
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{
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m_hWnd = NULL;
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m_pfnPrevWindowProc = NULL;
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m_cRef = 1;
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}
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CWnd::~CWnd()
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{
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}
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BOOL CWnd::Attach(HWND hwnd)
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{
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m_hWnd = hwnd;
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SetPropA(hwnd, "CWnd*", (HANDLE)this);
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m_pfnPrevWindowProc = SubclassWindow(hwnd, StaticWindowProc);
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m_cRef++;
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return TRUE;
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}
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void CWnd::Release()
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{
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m_cRef--;
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if (0==m_cRef)
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delete this;
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}
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// Can NOT cache the return value from this function
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CWnd* CWnd::FromHandle(HWND hwnd)
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{
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return (CWnd*)GetPropA(hwnd, "CWnd*");
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}
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LRESULT CWnd::Default(UINT message, WPARAM wParam, LPARAM lParam)
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{
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return CallWindowProc(m_pfnPrevWindowProc, m_hWnd, message, wParam, lParam );
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}
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LRESULT CALLBACK CWnd::StaticWindowProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
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{
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LRESULT lResult;
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CWnd* pWnd = FromHandle(hwnd);
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if (pWnd)
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{
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lResult = pWnd->WindowProc(message, wParam, lParam);
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if (message == WM_NCDESTROY)
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{
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RemovePropA(hwnd, "CWnd*");
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pWnd->OnNCDESTROY();
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}
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}
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else
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{
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lResult = DefWindowProc(hwnd, message, wParam, lParam);
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}
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return lResult;
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}
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void CWnd::OnNCDESTROY()
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{
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SubclassWindow(m_hWnd, m_pfnPrevWindowProc);
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m_hWnd = NULL;
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m_pfnPrevWindowProc = NULL;
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Release();
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}
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