C++--CSplitterWnd::CreateView创建CListView创建过程的调试摘抄

一、调用过程

1 Call CObject* CRuntimeClass::CreateObject()
1.1 Call CObject::operator new(size_t nSize, LPCSTR lpszFileName, int nLine)
1.2 Call CCtrlView::CCtrlView(LPCTSTR lpszClass, DWORD dwStyle)
1.2.1 CCtrlView::CCtrlView(LPCTSTR lpszClass, DWORD dwStyle) 
1.2.1.1..........
1.2.2 Call CCtrlView::CCtrlView(LPCTSTR lpszClass, DWORD dwStyle)'code

2 DWORD dwStyle = AFX_WS_DEFAULT_VIEW & ~WS_BORDER;
  Call pWnd->Create(NULL, NULL, dwStyle,rect, this, IdFromRowCol(row, col), pContext)
2.1 CWnd::CreateEx
2.1.1 构造默认CREATESTRUCT cs
2.1.2 BOOL CListView::PreCreateWindow(CREATESTRUCT& cs)
2.1.2.1 BOOL CCtrlView::PreCreateWindow(CREATESTRUCT& cs)
2.1.2.1.1 cs.lpszClass = "SysListView32"
          if ((cs.style | WS_BORDER) == AFX_WS_DEFAULT_VIEW)
  cs.style = m_dwDefaultStyle & (cs.style | ~WS_BORDER);
2.1.2.1.2 return CView::PreCreateWindow(cs);
2.1.3 call CreateWindowEx API
2.1.3.1 Before returning, CreateWindow sends a WM_CREATE message to the window procedure,
         CWnd::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
2.1.3.1.1// allow other subclassing to occur first
   pWndInit->PreSubclassWindow();
2.1.3.1.2 根据消息映射调用int CListView::OnCreate(LPCREATESTRUCT lpcs) 

二、CreateView代码摘抄

/////////////////////////////////////////////////////////////////////////////
// CSplitterWnd default creation of parts

// You must create ALL panes unless DYNAMIC_SPLIT is defined!
//  Usually the splitter window is invisible when creating a pane
BOOL CSplitterWnd::CreateView(int row, int col,
 CRuntimeClass* pViewClass, SIZE sizeInit, CCreateContext* pContext)
{
#ifdef _DEBUG
 ASSERT_VALID(this);
 ASSERT(row >= 0 && row < m_nRows);
 ASSERT(col >= 0 && col < m_nCols);
 ASSERT(pViewClass != NULL);
 ASSERT(pViewClass->IsDerivedFrom(RUNTIME_CLASS(CWnd)));
 ASSERT(AfxIsValidAddress(pViewClass, sizeof(CRuntimeClass), FALSE));

 if (GetDlgItem(IdFromRowCol(row, col)) != NULL)
 {
  TRACE(traceAppMsg, 0, "Error: CreateView - pane already exists for row %d, col %d./n",
   row, col);
  ASSERT(FALSE);
  return FALSE;
 }
#endif

 // set the initial size for that pane
 m_pColInfo[col].nIdealSize = sizeInit.cx;
 m_pRowInfo[row].nIdealSize = sizeInit.cy;

 BOOL bSendInitialUpdate = FALSE;

 CCreateContext contextT;
 if (pContext == NULL)
 {
  // if no context specified, generate one from the currently selected
  //  client if possible
  CView* pOldView = (CView*)GetActivePane();
  if (pOldView != NULL && pOldView->IsKindOf(RUNTIME_CLASS(CView)))
  {
   // set info about last pane
   ASSERT(contextT.m_pCurrentFrame == NULL);
   contextT.m_pLastView = pOldView;
   contextT.m_pCurrentDoc = pOldView->GetDocument();
   if (contextT.m_pCurrentDoc != NULL)
    contextT.m_pNewDocTemplate =
      contextT.m_pCurrentDoc->GetDocTemplate();
  }
  pContext = &contextT;
  bSendInitialUpdate = TRUE;
 }

 CWnd* pWnd;
 TRY
 {
  pWnd = (CWnd*)pViewClass->CreateObject();
  if (pWnd == NULL)
   AfxThrowMemoryException();
 }
 CATCH_ALL(e)
 {
  TRACE(traceAppMsg, 0, "Out of memory creating a splitter pane./n");
  // Note: DELETE_EXCEPTION(e) not required
  return FALSE;
 }
 END_CATCH_ALL

 ASSERT_KINDOF(CWnd, pWnd);
 ASSERT(pWnd->m_hWnd == NULL);       // not yet created

 DWORD dwStyle = AFX_WS_DEFAULT_VIEW & ~WS_BORDER;

 // Create with the right size (wrong position)
 CRect rect(CPoint(0,0), sizeInit);
 if (!pWnd->Create(NULL, NULL, dwStyle,
  rect, this, IdFromRowCol(row, col), pContext))
 {
  TRACE(traceAppMsg, 0, "Warning: couldn't create client pane for splitter./n");
   // pWnd will be cleaned up by PostNcDestroy
  return FALSE;
 }
 ASSERT((int)_AfxGetDlgCtrlID(pWnd->m_hWnd) == IdFromRowCol(row, col));

 // send initial notification message
 if (bSendInitialUpdate)
  pWnd->SendMessage(WM_INITIALUPDATE);

 return TRUE;
}

三、其他相关代码摘抄

CObject* CRuntimeClass::CreateObject()
{
 ENSURE(this);

 if (m_pfnCreateObject == NULL)
 {
  TRACE(traceAppMsg, 0,
   _T("Error: Trying to create object which is not ")
   _T("DECLARE_DYNCREATE /nor DECLARE_SERIAL: %hs./n"),
   m_lpszClassName);
  return NULL;
 }

 CObject* pObject = NULL;
 TRY
 {
  pObject = (*m_pfnCreateObject)();//Call New Operator and Constructor
 }
 END_TRY

 return pObject;
}

CObject::operator new(size_t nSize, LPCSTR lpszFileName, int nLine)
{
 return ::operator new(nSize, _AFX_CLIENT_BLOCK, lpszFileName, nLine);
}

_AFXCVIEW_INLINE CListView::CListView() : CCtrlView(WC_LISTVIEW,
 AFX_WS_DEFAULT_VIEW)
 { }
 

CCtrlView::CCtrlView(LPCTSTR lpszClass, DWORD dwStyle)
{
 m_strClass = lpszClass;
 m_dwDefaultStyle = dwStyle;
}