MFC浅析(1) 文档视图结构中，缺省的命令处理-杂项


void CDocManager::OnFileNew()

{

 if (m_templateList.IsEmpty())

 {

  TRACE0("Error: no document templates registered with CWinApp.\n");

  AfxMessageBox(AFX_IDP_FAILED_TO_CREATE_DOC);

  return;

 }

 CDocTemplate* pTemplate = (CDocTemplate*)m_templateList.GetHead();

 //如果含有多个文档模板，显示一个新建文档类型对话框

 if (m_templateList.GetCount() > 1)

 {

  // more than one document template to choose from

  // bring up dialog prompting user

  CNewTypeDlg dlg(&m_templateList);

  int nID = dlg.DoModal();

  if (nID == IDOK)

   pTemplate = dlg.m_pSelectedTemplate;

  else

   return;     // none - cancel operation

 }

 ASSERT(pTemplate != NULL);

 ASSERT_KINDOF(CDocTemplate, pTemplate);

 

 //建立空文件

 pTemplate->OpenDocumentFile(NULL);

  // if returns NULL, the user has already been alerted

}

2.ID_FILE_OPEN

CWinApp::OnFileOpen

调用m_pDocManager->OnFileOpen()


void CDocManager::OnFileOpen()

{

 //出现打开文件对话框文件取得文件名

 CString newName;

 if (!DoPromptFileName(newName, AFX_IDS_OPENFILE,

   OFN_HIDEREADONLY ¦ OFN_FILEMUSTEXIST, TRUE, NULL))

  return; 

 

 //使用OpenDocumentFile

 AfxGetApp()->OpenDocumentFile(newName);

  // if returns NULL, the user has already been alerted

}

3.ID_FILE_SAVE

CDocument::OnFileSave()

调用DoFileSave()


void CDocument::OnFileSave()

{

 DoFileSave();

}

DoFileSave()又将调用DoSave()


BOOL CDocument::DoFileSave()

{

 DWORD dwAttrib = GetFileAttributes(m_strPathName);

 //如果文件是只读,或已经不存在了

 if (dwAttrib & FILE_ATTRIBUTE_READONLY)

 {

  //使用带NULL参数的DoSave

  if (!DoSave(NULL))

  {

   TRACE0("Warning: File save with new name failed.\n");

   return FALSE;

  }

 }

 else

 {

  //使用DoSave(....)

  if (!DoSave(m_strPathName))

  {

   TRACE0("Warning: File save failed.\n");

   return FALSE;

  }

 }

 return TRUE;

}

DoSave()的实现


BOOL CDocument::DoSave(LPCTSTR lpszPathName, BOOL bReplace)

//如果文件名参数为空，则让用户取名

// note: lpszPathName can be different than 'm_strPathName'

{

 CString newName = lpszPathName;

 if (newName.IsEmpty())

 {

  CDocTemplate* pTemplate = GetDocTemplate();

  ASSERT(pTemplate != NULL);

  newName = m_strPathName;

  if (bReplace && newName.IsEmpty())

  {

   newName = m_strTitle;

   // check for dubious filename

   int iBad = newName.FindOneOf(_T(" #%;/\\"));

   if (iBad != -1)

    newName.ReleaseBuffer(iBad);

   // append the default suffix if there is one

   CString strExt;

   if (pTemplate->GetDocString(strExt, CDocTemplate::filterExt) &&

     !strExt.IsEmpty())

   {

    ASSERT(strExt[0] == '.');

    newName += strExt;

   }

  }

  //"保存为"对话框

  if (!AfxGetApp()->DoPromptFileName(newName,

    bReplace ? AFX_IDS_SAVEFILE : AFX_IDS_SAVEFILECOPY,

    OFN_HIDEREADONLY ¦ OFN_PATHMUSTEXIST, FALSE, pTemplate))

   return FALSE;       // don't even attempt to save

 }

 CWaitCursor wait;

 

 //保存,由OnSaveDocument完成

 if (!OnSaveDocument(newName))

 {

  if (lpszPathName == NULL)

  {

   // be sure to delete the file

   TRY

   {

    CFile::Remove(newName);

   }

   CATCH_ALL(e)

   {

    TRACE0("Warning: failed to delete file \n");

    DELETE_EXCEPTION(e);

   }

   END_CATCH_ALL

  }

  return FALSE;

 }

 // reset the title and change the document name

 if (bReplace)

  SetPathName(newName);

 return TRUE;        // success

}

使用了文档类的OnSaveDocument完成保存动作


BOOL CDocument::OnSaveDocument(LPCTSTR lpszPathName)

{

 CFileException fe;

 CFile* pFile = NULL;

 pFile = GetFile(lpszPathName, CFile::modeCreate ¦

  CFile::modeReadWrite ¦ CFile::shareExclusive, &fe);

 if (pFile == NULL)

 {

  ReportSaveLoadException(lpszPathName, &fe,

   TRUE, AFX_IDP_INVALID_FILENAME);

  return FALSE;

 }

 //建立保存用的CArchive 

 CArchive saveArchive(pFile, CArchive::store ¦ CArchive::bNoFlushOnDelete);

 saveArchive.m_pDocument = this;

 saveArchive.m_bForceFlat = FALSE;

 TRY

 {

  CWaitCursor wait;

  //使用文档类的序列化操作完成实际存档行为

  Serialize(saveArchive);     // save me

  saveArchive.Close();

  ReleaseFile(pFile, FALSE);

 }

 CATCH_ALL(e)

 {

  ReleaseFile(pFile, TRUE);

  TRY

  {

   ReportSaveLoadException(lpszPathName, e,

    TRUE, AFX_IDP_FAILED_TO_SAVE_DOC);

  }

  END_TRY

  DELETE_EXCEPTION(e);

  return FALSE;

 }

 END_CATCH_ALL

 SetModifiedFlag(FALSE);     // back to unmodified

 return TRUE;        // success

}

4.ID_FILE_SAVE_AS

CDocument::OnFileSaveAs()

具体实现：调用NULL参数的DoSave(..)


void CDocument::OnFileSaveAs()

{

 if (!DoSave(NULL))

  TRACE0("Warning: File save-as failed.\n");

}

5.ID_FILE_SAVE_COPY_AS

The COleServerDoc::OnFileSaveCopyAs

6.ID_FILE_CLOSE

CDocument::OnFileClose


void CDocument::OnFileClose()

{

 //保存内容

 if (!SaveModified())

  return;

 //关闭文档

 OnCloseDocument();

}

如果需要保存，调用DoFileSave(..)


BOOL CDocument::SaveModified()

{

 //没有改动

 if (!IsModified())

  return TRUE;        

 //得到文件名

 CString name;

 if (m_strPathName.IsEmpty())

 {

  // get name based on caption

  name = m_strTitle;

  if (name.IsEmpty())

   VERIFY(name.LoadString(AFX_IDS_UNTITLED));

 }

 else

 {

  // get name based on file title of path name

  name = m_strPathName;

  if (afxData.bMarked4)

  {

   AfxGetFileTitle(m_strPathName, 

    name.GetBuffer(_MAX_PATH), _MAX_PATH);

   name.ReleaseBuffer();

  }

 }

 CString prompt;

 AfxFormatString1(prompt, AFX_IDP_ASK_TO_SAVE, name);

 //对话框:文件已被改动，是否保存

 switch (AfxMessageBox(prompt, MB_YESNOCANCEL, AFX_IDP_ASK_TO_SAVE))

 {

 case IDCANCEL:

  return FALSE;       // don't continue

 case IDYES:

  //保存文件

  if (!DoFileSave())

   return FALSE;       // don't continue

  break;

 case IDNO:

  // If not saving changes, revert the document

  break;

 default:

  ASSERT(FALSE);

  break;

 }

 return TRUE;

}

7.ID_FILE_UPDATE

COleServerDoc::OnUpdateDocument

8.ID_FILE_PRINT_SETUP

CWinApp::OnFilePrintSetup

9.ID_FILE_PRINT

CView::OnFilePrint

10.ID_FILE_PRINT_PREVIEW

CView::OnFilePrintPreview

11.缺省编辑控制ID

ID_EDIT_CLEAR

ID_EDIT_CLEAR_ALL

ID_EDIT_COPY

ID_EDIT_CUT

ID_EDIT_FIND

ID_EDIT_PASTE

ID_EDIT_PASTE_LINK

ID_EDIT_PASTE_SPECIAL

ID_EDIT_REPEAT

ID_EDIT_REPLACE

ID_EDIT_SELECT_ALL

ID_EDIT_UNDO

ID_EDIT_REDO

这些ID在对应的编辑视中有相应处理函数

12.ID_WINDOW_NEW

CMDIFrameWnd::OnWindowNew


void CMDIFrameWnd::OnWindowNew()

{

 //找到当前窗口，得到对应文档模板，使用文档模板的成员CreateNewFrame建立新窗口

 CMDIChildWnd* pActiveChild = MDIGetActive();

 CDocument* pDocument;

 if (pActiveChild == NULL ¦¦

   (pDocument = pActiveChild->GetActiveDocument()) == NULL)

 {

  TRACE0("Warning: No active document for WindowNew command.\n");

  AfxMessageBox(AFX_IDP_COMMAND_FAILURE);

  return;     // command failed

 }

 // otherwise we have a new frame !

 CDocTemplate* pTemplate = pDocument->GetDocTemplate();

 ASSERT_VALID(pTemplate);

 CFrameWnd* pFrame = pTemplate->CreateNewFrame(pDocument, pActiveChild);

 if (pFrame == NULL)

 {

  TRACE0("Warning: failed to create new frame.\n");

  return;     // command failed

 }

 pTemplate->InitialUpdateFrame(pFrame, pDocument);

}

13.ID_WINDOW_ARRANGE

ID_WINDOW_ARRANGE,以及ID_WINDOW_CASCADE、ID_WINDOW_TILE_HORZ、ID_WINDOW_TILE_VERT都由OnMDIWindowCmd()处理

OnMDIWindowCmd将相应消息发送给m_hWndMDIClient


BOOL CMDIFrameWnd::OnMDIWindowCmd(UINT nID)

{

 ASSERT(m_hWndMDIClient != NULL);

 UINT msg;

 UINT wParam = 0;

 switch (nID)

 {

 default:

  return FALSE;       // not for us

 case ID_WINDOW_ARRANGE:

  msg = WM_MDIICONARRANGE;

  break;

 case ID_WINDOW_CASCADE:

  msg = WM_MDICASCADE;

  break;

 case ID_WINDOW_TILE_HORZ:

  wParam = MDITILE_HORIZONTAL;

  // fall through

 case ID_WINDOW_TILE_VERT:

  ASSERT(MDITILE_VERTICAL == 0);

  msg = WM_MDITILE;

  break;

 }

 ::SendMessage(m_hWndMDIClient, msg, wParam, 0);

 return TRUE;

}

14.ID_WINDOW_CASCADE

参见ID_WINDOW_ARRANGE

15.ID_WINDOW_TILE_HORZ

参见ID_WINDOW_ARRANGE

16.ID_WINDOW_TILE_VERT

参见ID_WINDOW_ARRANGE

17.ID_WINDOW_SPLIT

CSplitterWnd::DoKeyboardSplit

用键盘控制分割窗口


BOOL CSplitterWnd::DoKeyboardSplit()

{

 ASSERT_VALID(this);

 int ht;

 if (m_nRows > 1 && m_nCols > 1)

  ht = splitterIntersection1; // split existing row+col

 else if (m_nRows > 1)

  ht = vSplitterBar1;         // split existing row

 else if (m_nCols > 1)

  ht = hSplitterBar1;         // split existing col

 else if (m_nMaxRows > 1 && m_nMaxCols > 1)

  ht = bothSplitterBox;       // we can split both

 else if (m_nMaxRows > 1)

  ht = vSplitterBox;          // we can split rows

 else if (m_nMaxCols > 1)

  ht = hSplitterBox;          // we can split columns

 else

  return FALSE;               // can't split

 // start tracking

 StartTracking(ht);

 CRect rect;

 rect.left = m_rectTracker.Width() / 2;

 rect.top = m_rectTracker.Height() / 2;

 if (m_ptTrackOffset.y != 0)

  rect.top = m_rectTracker.top;

 if (m_ptTrackOffset.x != 0)

  rect.left = m_bTracking2 ? m_rectTracker2.left :m_rectTracker.left;

 rect.OffsetRect(-m_ptTrackOffset.x, -m_ptTrackOffset.y);

 ClientToScreen(&rect);

 SetCursorPos(rect.left, rect.top);

 return TRUE;

}

18.ID_APP_ABOUT

建立CWinApp::OnAppAbout();

19.ID_APP_EXIT

CWinApp::OnAppExit

直接向主窗口发送WM_CLOSE消息


void CWinApp::OnAppExit()

{

 // same as double-clicking on main window close box

 ASSERT(m_pMainWnd != NULL);

 m_pMainWnd->SendMessage(WM_CLOSE);

}

20.ID_HELP_INDEX

CWinApp::OnHelpIndex

21.ID_HELP_USING

CWinApp::OnHelpUsing

22.ID_CONTEXT_HELP

CWinApp::OnContextHelp

23.ID_HELP

CWinApp::OnHelp

24.ID_DEFAULT_HELP

CWinApp::OnHelpIndex

25.ID_NEXT_PANE

CSplitterWnd::OnNextPaneCmd

26.ID_PREV_PANE

CSplitterWnd::OnNextPaneCmd

27.ID_OLE_INSERT_NEW

28.ID_OLE_EDIT_LINKS

29.ID_VIEW_TOOLBAR

切换AFX_IDW_TOOLBAR工具条

消息映射

ON_UPDATE_COMMAND_UI(ID_VIEW_TOOLBAR, OnUpdateControlBarMenu)

ON_COMMAND_EX(ID_VIEW_TOOLBAR, OnBarCheck)


BOOL CFrameWnd::OnBarCheck(UINT nID)

{

 ASSERT(ID_VIEW_STATUS_BAR == AFX_IDW_STATUS_BAR);

 ASSERT(ID_VIEW_TOOLBAR == AFX_IDW_TOOLBAR);

 ASSERT(ID_VIEW_REBAR == AFX_IDW_REBAR);

 CControlBar* pBar = GetControlBar(nID);

 if (pBar != NULL)

 {

  //设置该工具条状态

  ShowControlBar(pBar, (pBar->GetStyle() & WS_VISIBLE) == 0, FALSE);

  return TRUE;

 }

 return FALSE;

}


void CFrameWnd::OnUpdateControlBarMenu(CCmdUI* pCmdUI)

{

 ASSERT(ID_VIEW_STATUS_BAR == AFX_IDW_STATUS_BAR);

 ASSERT(ID_VIEW_TOOLBAR == AFX_IDW_TOOLBAR);

 ASSERT(ID_VIEW_REBAR == AFX_IDW_REBAR);

 CControlBar* pBar = GetControlBar(pCmdUI->m_nID);

 if (pBar != NULL)

 {

  pCmdUI->SetCheck((pBar->GetStyle() & WS_VISIBLE) != 0);

  return;

 }

 pCmdUI->ContinueRouting();

}

30.ID_VIEW_STATUS_BAR

实现方法与ID_VIEW_TOOLBAR相同

附件：

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