// This is a part of the Microsoft Foundation Classes C++ library.
// Copyright (C) 1992-1998 Microsoft Corporation
// All rights reserved.
//
// This source code is only intended as a supplement to the
// Microsoft Foundation Classes Reference and related
// electronic documentation provided with the library.
// See these sources for detailed information regarding the
// Microsoft Foundation Classes product.

#include "stdafx.h"
#include "io.h" // for _access

#ifdef AFX_CORE2_SEG
#pragma code_seg(AFX_CORE2_SEG)
#endif

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CDocument

BEGIN_MESSAGE_MAP(CDocument, CCmdTarget)
	//{{AFX_MSG_MAP(CDocument)
	ON_COMMAND(ID_FILE_CLOSE, OnFileClose)
	ON_COMMAND(ID_FILE_SAVE, OnFileSave)
	ON_COMMAND(ID_FILE_SAVE_AS, OnFileSaveAs)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CDocument construction/destruction

CDocument::CDocument()
{
	m_pDocTemplate = NULL;
	m_bModified = FALSE;
	m_bAutoDelete = TRUE;       // default to auto delete document
	m_bEmbedded = FALSE;        // default to file-based document
	ASSERT(m_viewList.IsEmpty());
}

CDocument::~CDocument()
{
	// do not call DeleteContents here !
#ifdef _DEBUG
	if (IsModified())
		TRACE0("Warning: destroying an unsaved document.\n");
#endif

	// there should be no views left!
	DisconnectViews();
	ASSERT(m_viewList.IsEmpty());

	if (m_pDocTemplate != NULL)
		m_pDocTemplate->RemoveDocument(this);
	ASSERT(m_pDocTemplate == NULL);     // must be detached
}

void CDocument::OnFinalRelease()
{
	ASSERT_VALID(this);

	OnCloseDocument();  // may 'delete this'
}

void CDocument::DisconnectViews()
{
	while (!m_viewList.IsEmpty())
	{
		CView* pView = (CView*)m_viewList.RemoveHead();
		ASSERT_VALID(pView);
		ASSERT_KINDOF(CView, pView);
		pView->m_pDocument = NULL;
	}
}

/////////////////////////////////////////////////////////////////////////////
// CDocument attributes, general services

void CDocument::SetTitle(LPCTSTR lpszTitle)
{
	m_strTitle = lpszTitle;
	UpdateFrameCounts();        // will cause name change in views
}

void CDocument::DeleteContents()
{
}

/////////////////////////////////////////////////////////////////////////////
// Closing documents or views

void CDocument::OnChangedViewList()
{
	// if no more views on the document, delete ourself
	// not called if directly closing the document or terminating the app
	if (m_viewList.IsEmpty() && m_bAutoDelete)
	{
		OnCloseDocument();
		return;
	}

	// update the frame counts as needed
	UpdateFrameCounts();
}

void CDocument::UpdateFrameCounts()
	 // assumes 1 doc per frame
{
	// walk all frames of views (mark and sweep approach)
	POSITION pos = GetFirstViewPosition();
	while (pos != NULL)
	{
		CView* pView = GetNextView(pos);
		ASSERT_VALID(pView);
		ASSERT(::IsWindow(pView->m_hWnd));
		if (pView->IsWindowVisible())   // Do not count invisible windows.
		{
			CFrameWnd* pFrame = pView->GetParentFrame();
			if (pFrame != NULL)
				pFrame->m_nWindow = -1;     // unknown
		}
	}

	// now do it again counting the unique ones
	int nFrames = 0;
	pos = GetFirstViewPosition();
	while (pos != NULL)
	{
		CView* pView = GetNextView(pos);
		ASSERT_VALID(pView);
		ASSERT(::IsWindow(pView->m_hWnd));
		if (pView->IsWindowVisible())   // Do not count invisible windows.
		{
			CFrameWnd* pFrame = pView->GetParentFrame();
			if (pFrame != NULL && pFrame->m_nWindow == -1)
			{
				ASSERT_VALID(pFrame);
				// not yet counted (give it a 1 based number)
				pFrame->m_nWindow = ++nFrames;
			}
		}
	}

	// lastly walk the frames and update titles (assume same order)
	// go through frames updating the appropriate one
	int iFrame = 1;
	pos = GetFirstViewPosition();
	while (pos != NULL)
	{
		CView* pView = GetNextView(pos);
		ASSERT_VALID(pView);
		ASSERT(::IsWindow(pView->m_hWnd));
		if (pView->IsWindowVisible())   // Do not count invisible windows.
		{
			CFrameWnd* pFrame = pView->GetParentFrame();
			if (pFrame != NULL && pFrame->m_nWindow == iFrame)
			{
				ASSERT_VALID(pFrame);
				if (nFrames == 1)
					pFrame->m_nWindow = 0;      // the only one of its kind
				pFrame->OnUpdateFrameTitle(TRUE);
				iFrame++;
			}
		}
	}
	ASSERT(iFrame == nFrames + 1);
}

BOOL CDocument::CanCloseFrame(CFrameWnd* pFrameArg)
	// permission to close all views using this frame
	//  (at least one of our views must be in this frame)
{
	ASSERT_VALID(pFrameArg);
	UNUSED(pFrameArg);   // unused in release builds

	POSITION pos = GetFirstViewPosition();
	while (pos != NULL)
	{
		CView* pView = GetNextView(pos);
		ASSERT_VALID(pView);
		CFrameWnd* pFrame = pView->GetParentFrame();
		// assume frameless views are ok to close
		if (pFrame != NULL)
		{
			// assumes 1 document per frame
			ASSERT_VALID(pFrame);
			if (pFrame->m_nWindow > 0)
				return TRUE;        // more than one frame refering to us
		}
	}

	// otherwise only one frame that we know about
	return SaveModified();
}

void CDocument::PreCloseFrame(CFrameWnd* /*pFrameArg*/)
{
	// default does nothing
}

/////////////////////////////////////////////////////////////////////////////
// File/Path commands

void CDocument::SetPathName(LPCTSTR lpszPathName, BOOL bAddToMRU)
{
	// store the path fully qualified
	TCHAR szFullPath[_MAX_PATH];
	AfxFullPath(szFullPath, lpszPathName);
	m_strPathName = szFullPath;
	ASSERT(!m_strPathName.IsEmpty());       // must be set to something
	m_bEmbedded = FALSE;
	ASSERT_VALID(this);

	// set the document title based on path name
	TCHAR szTitle[_MAX_FNAME];
	if (AfxGetFileTitle(szFullPath, szTitle, _MAX_FNAME) == 0)
		SetTitle(szTitle);

	// add it to the file MRU list
	if (bAddToMRU)
		AfxGetApp()->AddToRecentFileList(m_strPathName);

	ASSERT_VALID(this);
}

/////////////////////////////////////////////////////////////////////////////
// Standard file menu commands

void CDocument::OnFileClose()
{
	if (!SaveModified())
		return;

	// shut it down
	OnCloseDocument();
		// this should destroy the document
}

void CDocument::OnFileSave()
{
	DoFileSave();
}

void CDocument::OnFileSaveAs()
{
	if (!DoSave(NULL))
		TRACE0("Warning: File save-as failed.\n");
}

BOOL CDocument::DoFileSave()
{
	DWORD dwAttrib = GetFileAttributes(m_strPathName);
	if (dwAttrib & FILE_ATTRIBUTE_READONLY)
	{
		// we do not have read-write access or the file does not (now) exist
		if (!DoSave(NULL))
		{
			TRACE0("Warning: File save with new name failed.\n");
			return FALSE;
		}
	}
	else
	{
		if (!DoSave(m_strPathName))
		{
			TRACE0("Warning: File save failed.\n");
			return FALSE;
		}
	}
	return TRUE;
}

BOOL CDocument::DoSave(LPCTSTR lpszPathName, BOOL bReplace)
	// Save the document data to a file
	// lpszPathName = path name where to save document file
	// if lpszPathName is NULL then the user will be prompted (SaveAs)
	// note: lpszPathName can be different than 'm_strPathName'
	// if 'bReplace' is TRUE will change file name if successful (SaveAs)
	// if 'bReplace' is FALSE will not change path name (SaveCopyAs)
{
	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;
			}
		}

		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;

	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 after failed SaveAs.\n");
				DELETE_EXCEPTION(e);
			}
			END_CATCH_ALL
		}
		return FALSE;
	}

	// reset the title and change the document name
	if (bReplace)
		SetPathName(newName);

	return TRUE;        // success
}

BOOL CDocument::SaveModified()
{
	if (!IsModified())
		return TRUE;        // ok to continue

	// get name/title of document
	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);
	switch (AfxMessageBox(prompt, MB_YESNOCANCEL, AFX_IDP_ASK_TO_SAVE))
	{
	case IDCANCEL:
		return FALSE;       // don't continue

	case IDYES:
		// If so, either Save or Update, as appropriate
		if (!DoFileSave())
			return FALSE;       // don't continue
		break;

	case IDNO:
		// If not saving changes, revert the document
		break;

	default:
		ASSERT(FALSE);
		break;
	}
	return TRUE;    // keep going
}

HMENU CDocument::GetDefaultMenu()
{
	return NULL;    // just use original default
}

HACCEL CDocument::GetDefaultAccelerator()
{
	return NULL;    // just use original default
}

void CDocument::ReportSaveLoadException(LPCTSTR lpszPathName,
	CException* e, BOOL bSaving, UINT nIDPDefault)
{
	UINT nIDP = nIDPDefault;
	UINT nHelpContext = nIDPDefault;
	CString prompt;

	if (e != NULL)
	{
		ASSERT_VALID(e);
		if (e->IsKindOf(RUNTIME_CLASS(CUserException)))
			return; // already reported

		if (e->IsKindOf(RUNTIME_CLASS(CArchiveException)))
		{
			switch (((CArchiveException*)e)->m_cause)
			{
			case CArchiveException::badSchema:
			case CArchiveException::badClass:
			case CArchiveException::badIndex:
			case CArchiveException::endOfFile:
				nIDP = AFX_IDP_FAILED_INVALID_FORMAT;
				break;
			default:
				break;
			}
		}
		else if (e->IsKindOf(RUNTIME_CLASS(CFileException)))
		{
			TRACE1("Reporting file I/O exception on Save/Load with lOsError = $%lX.\n",
				((CFileException*)e)->m_lOsError);

			CFileException* pFileException = (CFileException*)e;
			if (pFileException->m_strFileName.IsEmpty())
				pFileException->m_strFileName = lpszPathName;

			LPTSTR lpszMessage = prompt.GetBuffer(255);
			ASSERT(lpszMessage != NULL);
			if (!e->GetErrorMessage(lpszMessage, 256, &nHelpContext))
			{
				switch (((CFileException*)e)->m_cause)
				{
					case CFileException::fileNotFound:
					case CFileException::badPath:
						nIDP = AFX_IDP_FAILED_INVALID_PATH;
						break;
					case CFileException::diskFull:
						nIDP = AFX_IDP_FAILED_DISK_FULL;
						break;
					case CFileException::accessDenied:
						nIDP = bSaving ? AFX_IDP_FAILED_ACCESS_WRITE :
								AFX_IDP_FAILED_ACCESS_READ;
						break;

					case CFileException::badSeek:
					case CFileException::generic:
					case CFileException::tooManyOpenFiles:
					case CFileException::invalidFile:
					case CFileException::hardIO:
					case CFileException::directoryFull:
						break;

					default:
						break;
				}
			}
			prompt.ReleaseBuffer();
		}
	}

	if (prompt.IsEmpty())
	{
		TCHAR szTitle[_MAX_PATH];
		if (afxData.bMarked4)
			AfxGetFileTitle(lpszPathName, szTitle, _countof(szTitle));
		else
			lstrcpyn(szTitle, lpszPathName, _countof(szTitle));
		AfxFormatString1(prompt, nIDP, szTitle);
	}

	AfxMessageBox(prompt, MB_ICONEXCLAMATION, nHelpContext);
}

/////////////////////////////////////////////////////////////////////////////
// File operations (default uses CDocument::Serialize)

CString CMirrorFile::GetTempName(LPCTSTR lpszOriginalFile, BOOL bCreate)
{
	CString str;

	// get the directory for the file

	TCHAR szPath[_MAX_PATH];
	LPTSTR lpszName;
	GetFullPathName(lpszOriginalFile, _MAX_PATH, szPath, &lpszName);
	*lpszName = NULL;

	// let's create a temporary file name, and create
	// a file too!

	GetTempFileName(szPath, _T("MFC"), 0,
		str.GetBuffer(_MAX_PATH+1));
	str.ReleaseBuffer();

	// delete the file if the user just wants a name

	if (!bCreate)
		CFile::Remove(str);

	return str;
}

BOOL CMirrorFile::Open(LPCTSTR lpszFileName, UINT nOpenFlags,
	CFileException* pError)
{
	ASSERT(lpszFileName != NULL);
	m_strMirrorName.Empty();

	CFileStatus status;
	if (nOpenFlags & CFile::modeCreate) //opened for writing
	{
		if (CFile::GetStatus(lpszFileName, status))
		{
			CString strRoot;
			AfxGetRoot(lpszFileName, strRoot);

			DWORD dwSecPerClus, dwBytesPerSec, dwFreeClus, dwTotalClus;
			DWORD nBytes = 0;
			if (GetDiskFreeSpace(strRoot, &dwSecPerClus, &dwBytesPerSec, &dwFreeClus,
				&dwTotalClus))
			{
				nBytes = dwFreeClus * dwSecPerClus * dwBytesPerSec;
			}
			if (nBytes > 2 * DWORD(status.m_size)) // at least 2x free space avail
			{
				m_strMirrorName = GetTempName(lpszFileName, TRUE);
			}
		}
	}

	if (!m_strMirrorName.IsEmpty() &&
		CFile::Open(m_strMirrorName, nOpenFlags, pError))
	{
		m_strFileName = lpszFileName;
		FILETIME ftCreate, ftAccess, ftModify;
		if (::GetFileTime((HANDLE)m_hFile, &ftCreate, &ftAccess, &ftModify))
		{
			AfxTimeToFileTime(status.m_ctime, &ftCreate);
			SetFileTime((HANDLE)m_hFile, &ftCreate, &ftAccess, &ftModify);
		}

		DWORD dwLength = 0;
		PSECURITY_DESCRIPTOR pSecurityDescriptor = NULL;
		if (GetFileSecurity(lpszFileName, DACL_SECURITY_INFORMATION,
			NULL, dwLength, &dwLength))
		{
			pSecurityDescriptor = (PSECURITY_DESCRIPTOR) new BYTE[dwLength];
			if (::GetFileSecurity(lpszFileName, DACL_SECURITY_INFORMATION,
				pSecurityDescriptor, dwLength, &dwLength))
			{
				SetFileSecurity(m_strMirrorName, DACL_SECURITY_INFORMATION, pSecurityDescriptor);
			}
			delete[] (BYTE*)pSecurityDescriptor;
		}
		return TRUE;
	}
	m_strMirrorName.Empty();
	return CFile::Open(lpszFileName, nOpenFlags, pError);
}

void CMirrorFile::Abort()
{
	CFile::Abort();
	if (!m_strMirrorName.IsEmpty())
		CFile::Remove(m_strMirrorName);
}

//WINBUG: these will be in a public header, some day.

typedef BOOL (WINAPI* ReplaceAPIPtr)(LPCWSTR, LPCWSTR, LPCWSTR,
						DWORD, LPVOID, LPVOID);
#ifndef REPLACEFILE_WRITE_THROUGH
#define REPLACEFILE_WRITE_THROUGH 0x00000001
#endif
#ifndef REPLACEFILE_IGNORE_MERGE_ERRORS
#define REPLACEFILE_IGNORE_MERGE_ERRORS 0x00000002
#endif

#ifndef ERROR_UNABLE_TO_MOVE_REPLACEMENT
#define ERROR_UNABLE_TO_MOVE_REPLACEMENT 1176L
#endif
#ifndef ERROR_UNABLE_TO_MOVE_REPLACEMENT_2
#define ERROR_UNABLE_TO_MOVE_REPLACEMENT_2 1177L
#endif

void CMirrorFile::Close()
{
	CString m_strName = m_strFileName; //file close empties string
	CFile::Close();
	if (!m_strMirrorName.IsEmpty())
	{
		BOOL bWorked = FALSE;
		DWORD dwResult = 0;
      ReplaceAPIPtr pfn = NULL;
		CString strBackupName;

		if (!afxData.bWin95)
		{
			HMODULE hModule = GetModuleHandleA("KERNEL32");
			ASSERT(hModule != NULL);

	      pfn = (ReplaceAPIPtr) GetProcAddress(hModule, "ReplaceFile");

			if (pfn != NULL)
			{
				USES_CONVERSION;

				strBackupName = GetTempName(m_strMirrorName, FALSE);

				// this NT API handles copying all attributes for us

				bWorked = (pfn)(T2W((LPTSTR)(LPCTSTR)m_strName),
                            T2W((LPTSTR)(LPCTSTR)m_strMirrorName),
                            T2W((LPTSTR)(LPCTSTR)strBackupName),
					REPLACEFILE_WRITE_THROUGH | REPLACEFILE_IGNORE_MERGE_ERRORS,
					NULL, NULL);

				if (!bWorked)
				   dwResult = GetLastError();
			}
		}

		if (!bWorked)
		{
			if (dwResult == ERROR_UNABLE_TO_MOVE_REPLACEMENT || dwResult == 0)
				CFile::Remove(m_strName);

			if (dwResult == ERROR_UNABLE_TO_MOVE_REPLACEMENT_2)
			   CFile::Remove(strBackupName);

			CFile::Rename(m_strMirrorName, m_strName);
		}
      else if (pfn != NULL)
      {
         CFile::Remove(strBackupName);
      }
	}
}

CFile* CDocument::GetFile(LPCTSTR lpszFileName, UINT nOpenFlags,
	CFileException* pError)
{
	CMirrorFile* pFile = new CMirrorFile;
	ASSERT(pFile != NULL);
	if (!pFile->Open(lpszFileName, nOpenFlags, pError))
	{
		delete pFile;
		pFile = NULL;
	}
	return pFile;
}

void CDocument::ReleaseFile(CFile* pFile, BOOL bAbort)
{
	ASSERT_KINDOF(CFile, pFile);
	if (bAbort)
		pFile->Abort(); // will not throw an exception
	else
		pFile->Close();
	delete pFile;
}

BOOL CDocument::OnNewDocument()
{
	if (IsModified())
		TRACE0("Warning: OnNewDocument replaces an unsaved document.\n");

	DeleteContents();
	m_strPathName.Empty();      // no path name yet
	SetModifiedFlag(FALSE);     // make clean

	return TRUE;
}

BOOL CDocument::OnOpenDocument(LPCTSTR lpszPathName)
{
	if (IsModified())
		TRACE0("Warning: OnOpenDocument replaces an unsaved document.\n");

	CFileException fe;
	CFile* pFile = GetFile(lpszPathName,
		CFile::modeRead|CFile::shareDenyWrite, &fe);
	if (pFile == NULL)
	{
		ReportSaveLoadException(lpszPathName, &fe,
			FALSE, AFX_IDP_FAILED_TO_OPEN_DOC);
		return FALSE;
	}

	DeleteContents();
	SetModifiedFlag();  // dirty during de-serialize

	CArchive loadArchive(pFile, CArchive::load | CArchive::bNoFlushOnDelete);
	loadArchive.m_pDocument = this;
	loadArchive.m_bForceFlat = FALSE;
	TRY
	{
		CWaitCursor wait;
		if (pFile->GetLength() != 0)
			Serialize(loadArchive);     // load me
		loadArchive.Close();
		ReleaseFile(pFile, FALSE);
	}
	CATCH_ALL(e)
	{
		ReleaseFile(pFile, TRUE);
		DeleteContents();   // remove failed contents

		TRY
		{
			ReportSaveLoadException(lpszPathName, e,
				FALSE, AFX_IDP_FAILED_TO_OPEN_DOC);
		}
		END_TRY
		DELETE_EXCEPTION(e);
		return FALSE;
	}
	END_CATCH_ALL

	SetModifiedFlag(FALSE);     // start off with unmodified

	return TRUE;
}

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;
	}

	CArchive saveArchive(pFile, CArchive::store | CArchive::bNoFlushOnDelete);
	saveArchive.m_pDocument = this;
	saveArchive.m_bForceFlat = FALSE;
	TRY
	{
		CWaitCursor wait;
		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
}

void CDocument::OnCloseDocument()
	// must close all views now (no prompting) - usually destroys this
{
	// destroy all frames viewing this document
	// the last destroy may destroy us
	BOOL bAutoDelete = m_bAutoDelete;
	m_bAutoDelete = FALSE;  // don't destroy document while closing views
	while (!m_viewList.IsEmpty())
	{
		// get frame attached to the view
		CView* pView = (CView*)m_viewList.GetHead();
		ASSERT_VALID(pView);
		CFrameWnd* pFrame = pView->GetParentFrame();
		ASSERT_VALID(pFrame);

		// and close it
		PreCloseFrame(pFrame);
		pFrame->DestroyWindow();
			// will destroy the view as well
	}
	m_bAutoDelete = bAutoDelete;

	// clean up contents of document before destroying the document itself
	DeleteContents();

	// delete the document if necessary
	if (m_bAutoDelete)
		delete this;
}

void CDocument::OnIdle()
{
	// default does nothing
}

/////////////////////////////////////////////////////////////////////////////
// View operations

void CDocument::AddView(CView* pView)
{
	ASSERT_VALID(pView);
	ASSERT(pView->m_pDocument == NULL); // must not be already attached
	ASSERT(m_viewList.Find(pView, NULL) == NULL);   // must not be in list

	m_viewList.AddTail(pView);
	ASSERT(pView->m_pDocument == NULL); // must be un-attached
	pView->m_pDocument = this;

	OnChangedViewList();    // must be the last thing done to the document
}

void CDocument::RemoveView(CView* pView)
{
	ASSERT_VALID(pView);
	ASSERT(pView->m_pDocument == this); // must be attached to us

	m_viewList.RemoveAt(m_viewList.Find(pView));
	pView->m_pDocument = NULL;

	OnChangedViewList();    // must be the last thing done to the document
}

POSITION CDocument::GetFirstViewPosition() const
{
	return m_viewList.GetHeadPosition();
}

CView* CDocument::GetNextView(POSITION& rPosition) const
{
	ASSERT(rPosition != BEFORE_START_POSITION);
		// use CDocument::GetFirstViewPosition instead !
	if (rPosition == NULL)
		return NULL;    // nothing left
	CView* pView = (CView*)m_viewList.GetNext(rPosition);
	ASSERT_KINDOF(CView, pView);
	return pView;
}

void CDocument::UpdateAllViews(CView* pSender, LPARAM lHint, CObject* pHint)
	// walk through all views
{
	ASSERT(pSender == NULL || !m_viewList.IsEmpty());
		// must have views if sent by one of them

	POSITION pos = GetFirstViewPosition();
	while (pos != NULL)
	{
		CView* pView = GetNextView(pos);
		ASSERT_VALID(pView);
		if (pView != pSender)
			pView->OnUpdate(pSender, lHint, pHint);
	}
}

void CDocument::SendInitialUpdate()
	// walk through all views and call OnInitialUpdate
{
	POSITION pos = GetFirstViewPosition();
	while (pos != NULL)
	{
		CView* pView = GetNextView(pos);
		ASSERT_VALID(pView);
		pView->OnInitialUpdate();
	}
}

/////////////////////////////////////////////////////////////////////////////
// command routing

BOOL CDocument::OnCmdMsg(UINT nID, int nCode, void* pExtra,
	AFX_CMDHANDLERINFO* pHandlerInfo)
{
	if (CCmdTarget::OnCmdMsg(nID, nCode, pExtra, pHandlerInfo))
		return TRUE;

	// otherwise check template
	if (m_pDocTemplate != NULL &&
	  m_pDocTemplate->OnCmdMsg(nID, nCode, pExtra, pHandlerInfo))
		return TRUE;

	return FALSE;
}

/////////////////////////////////////////////////////////////////////////////
// CDocument diagnostics

#ifdef _DEBUG
void CDocument::Dump(CDumpContext& dc) const
{
	CObject::Dump(dc);

	dc << "m_strTitle = " << m_strTitle;
	dc << "\nm_strPathName = " << m_strPathName;
	dc << "\nm_bModified = " << m_bModified;
	dc << "\nm_pDocTemplate = " << (void*)m_pDocTemplate;

	if (dc.GetDepth() > 0)
	{
		POSITION pos = GetFirstViewPosition();
		while (pos != NULL)
		{
			CView* pView = GetNextView(pos);
			dc << "\nwith view " << (void*)pView;
		}
	}

	dc << "\n";
}

void CDocument::AssertValid() const
{
	CObject::AssertValid();

	POSITION pos = GetFirstViewPosition();
	while (pos != NULL)
	{
		CView* pView = GetNextView(pos);
		ASSERT_VALID(pView);
	}
}
#endif //_DEBUG

#ifdef AFX_INIT_SEG
#pragma code_seg(AFX_INIT_SEG)
#endif

IMPLEMENT_DYNAMIC(CDocument, CCmdTarget)

/////////////////////////////////////////////////////////////////////////////