MFC浅析(1) 文档视图结构中，缺省的命令处理

文档视图结构中，缺省的命令处理

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文档视图结构中，缺省的命令处理

在文档视图结构所构建的框架中，很多命令ID都有缺省的命令处理。很多功能都由他们完成，但这些功能在程序中不“可见”,不便于对程序的理解。

以下归纳了常见的缺省处理及其流程

在需要时候，可以重载这些函数以实现特定功能

1.ID_FILE_NEW

2.ID_FILE_OPEN

3.ID_FILE_SAVE

4.ID_FILE_SAVE_AS

5.ID_FILE_SAVE_COPY_AS

6.ID_FILE_CLOSE

7.ID_FILE_UPDATE

8.ID_FILE_PRINT_SETUP

9.ID_FILE_PRINT

10.ID_FILE_PRINT_PREVIEW

11.缺省编辑控制ID

12.ID_WINDOW_NEW

13.ID_WINDOW_ARRANGE

14.ID_WINDOW_CASCADE

15.ID_WINDOW_TILE_HORZ

16.ID_WINDOW_TILE_VERT

17.ID_WINDOW_SPLIT

18.ID_APP_ABOUT

19.ID_APP_EXIT

20.ID_HELP_INDEX

21.ID_HELP_USING

22.ID_CONTEXT_HELP

23.ID_HELP

24.ID_DEFAULT_HELP

25.ID_NEXT_PANE

26.ID_PREV_PANE

27.ID_OLE_INSERT_NEW

28.ID_OLE_EDIT_LINKS

29.ID_VIEW_TOOLBAR

30.ID_VIEW_STATUS_BAR

1.ID_FILE_NEW

CWinApp::OnFileNew

调用m_pDocManager->OnFileNew()

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

转帖：http://blog.csdn.net/FMD/article/details/5522