SVDI: a "Single View, Multiple Documents" MFC Architecture

// SVDI.cpp : Defines the class behaviors for the application.
//

#include "stdafx.h"
#include "SVDI.h"
#include "MainFrm.h"

#include "SVDIDoc.h"
#include "SVDIView.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// CSVDIApp

BEGIN_MESSAGE_MAP(CSVDIApp, CWinApp)
	ON_COMMAND(ID_APP_ABOUT, OnAppAbout)
	// Standard file based document commands
	ON_COMMAND(ID_FILE_NEW, CWinApp::OnFileNew)
	ON_COMMAND(ID_FILE_OPEN, CWinApp::OnFileOpen)
	// Current document menu
	ON_UPDATE_COMMAND_UI(ID_VIEW_DOCUMENT1, OnUpdateDocumentMenu)
	// Standard print setup command
	ON_COMMAND(ID_FILE_PRINT_SETUP, CWinApp::OnFilePrintSetup)
END_MESSAGE_MAP()


// CSVDIApp construction

CSVDIApp::CSVDIApp()
{
	// TODO: add construction code here,
	// Place all significant initialization in InitInstance
}


// The one and only CSVDIApp object

CSVDIApp theApp;

// CSVDIApp initialization

BOOL CSVDIApp::InitInstance()
{
	// InitCommonControls() is required on Windows XP if an application
	// manifest specifies use of ComCtl32.dll version 6 or later to enable
	// visual styles.  Otherwise, any window creation will fail.
	InitCommonControls();

	CWinApp::InitInstance();

	// Initialize OLE libraries
	if (!AfxOleInit())
	{
		AfxMessageBox(IDP_OLE_INIT_FAILED);
		return FALSE;
	}
	AfxEnableControlContainer();
	// Standard initialization
	// If you are not using these features and wish to reduce the size
	// of your final executable, you should remove from the following
	// the specific initialization routines you do not need
	// Change the registry key under which our settings are stored
	// TODO: You should modify this string to be something appropriate
	// such as the name of your company or organization
	SetRegistryKey(_T("Local AppWizard-Generated Applications"));
	LoadStdProfileSettings(4);  // Load standard INI file options (including MRU)
	// Register the application's document templates.  Document templates
	//  serve as the connection between documents, frame windows and views
	CSingleViewMultiDocTemplate* pDocTemplate;
	pDocTemplate = new CSingleViewMultiDocTemplate(
		IDR_MAINFRAME,
		RUNTIME_CLASS(CSVDIDoc),
		RUNTIME_CLASS(CMainFrame),       // main SDI frame window
		RUNTIME_CLASS(CSVDIView));
	if (!pDocTemplate)
		return FALSE;
	AddDocTemplate(pDocTemplate);
	// create main MDI Frame window
	CMainFrame* pMainFrame = new CMainFrame;
	if (!pMainFrame || !pMainFrame->LoadFrame(IDR_MAINFRAME))
		return FALSE;
	m_pMainWnd = pMainFrame;
	// call DragAcceptFiles only if there's a suffix
	//  In an MDI app, this should occur immediately after setting m_pMainWnd
	// Parse command line for standard shell commands, DDE, file open
	CCommandLineInfo cmdInfo;
	ParseCommandLine(cmdInfo);
	// Dispatch commands specified on the command line.  Will return FALSE if
	// app was launched with /RegServer, /Register, /Unregserver or /Unregister.
	if (!ProcessShellCommand(cmdInfo))
		return FALSE;
	// The main window has been initialized, so show and update it
	pMainFrame->ShowWindow(m_nCmdShow);
	pMainFrame->UpdateWindow();
	return TRUE;
}



// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
	CAboutDlg();

// Dialog Data
	enum { IDD = IDD_ABOUTBOX };

protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support

// Implementation
protected:
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
END_MESSAGE_MAP()

// App command to run the dialog
void CSVDIApp::OnAppAbout()
{
	CAboutDlg aboutDlg;
	aboutDlg.DoModal();
}


// CSVDIApp message handlers

void CSVDIApp::OnUpdateDocumentMenu(CCmdUI* pCmdUI)
{
	ASSERT_VALID(this);

	// Update menu
	CMenu* pMenu = pCmdUI->m_pMenu;
	if (pMenu == NULL)
		return;

	// Delete all items after first one
	UINT nID = pCmdUI->m_nID + 1;
	while(pMenu->DeleteMenu(nID, MF_BYCOMMAND))
		nID++;

	// Build temporary document list
	CPtrList docList;
	// iterating over document templates
	POSITION pos = GetFirstDocTemplatePosition();
	while (pos != NULL) {
		CDocTemplate* pTempl = GetNextDocTemplate(pos);

		// iterating over documents
		POSITION pos2 = pTempl->GetFirstDocPosition();
		while (pos2 != NULL) {
			CDocument* pDocument = pTempl->GetNextDoc(pos2);
			docList.AddTail(pDocument);
		}
	}

	CString strItem;
	if (docList.IsEmpty()) {
		// There is no document;
		// first item just shows default text
		strItem.LoadString(ID_VIEW_DOCUMENT1);
		pMenu->ModifyMenu(pCmdUI->m_nID, MF_BYCOMMAND | MF_STRING, pCmdUI->m_nID, (LPCTSTR)strItem);
		pCmdUI->m_nIndexMax = pMenu->GetMenuItemCount();
		pCmdUI->Enable(FALSE);
		return;
	}

	// Find active document
	CFrameWnd* pWnd = (CFrameWnd*)AfxGetApp()->m_pMainWnd;
	ASSERT(pWnd != NULL);
	ASSERT_KINDOF(CFrameWnd, pWnd);
	CDocument* pActiveDoc = pWnd->GetActiveDocument();

	// One or more documents are open;
	// each document matches one menu item
	pos = docList.GetHeadPosition();
	nID = pCmdUI->m_nID;
	UINT nIndex = pCmdUI->m_nIndex;
	while (pos != NULL)	{
		CDocument* pDocument = (CDocument*)docList.GetNext(pos);
		strItem.Format(_T("&%u "), nID - ID_VIEW_DOCUMENT1 + 1);
		strItem += pDocument->GetTitle();
		if (nID == pCmdUI->m_nID)
			pMenu->ModifyMenu(nID, MF_BYCOMMAND | MF_STRING, nID, (LPCTSTR)strItem);
		else
			pMenu->InsertMenu(nIndex, MF_STRING | MF_BYPOSITION, nID, strItem);

		// If this document is active, item is checked
		pMenu->CheckMenuItem(nID, MF_BYCOMMAND | (pDocument == pActiveDoc ? MF_CHECKED : MF_UNCHECKED));

		nID++;
		nIndex++;
	}

	// update end menu count
	pCmdUI->m_nIndex = nIndex - 1; // point to last menu added
	pCmdUI->m_nIndexMax = pCmdUI->m_pMenu->GetMenuItemCount();

	// very important: otherwise all changes do not appear
	pCmdUI->m_bEnableChanged = TRUE;
}