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
