Undo and Redo the "Easy" Way

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

#include "stdafx.h"
#pragma warning (disable:4786)
#include "DrawIt.h"

#include "MainFrm.h"
#include "DrawItDoc.h"
#include "DrawItView.h"
#include ".\drawit.h"
#include "afxcmn.h"
#include "afxdhtml.h"

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

/////////////////////////////////////////////////////////////////////////////
// The one and only CDrawItApp object

CDrawItApp theApp;

/////////////////////////////////////////////////////////////////////////////
// CDrawItApp

BEGIN_MESSAGE_MAP(CDrawItApp, CWinApp)
	//{{AFX_MSG_MAP(CDrawItApp)
	ON_COMMAND(ID_APP_ABOUT, OnAppAbout)
	//}}AFX_MSG_MAP
	// Standard file based document commands
	ON_COMMAND(ID_FILE_NEW, CWinApp::OnFileNew)
	ON_COMMAND(ID_FILE_OPEN, CWinApp::OnFileOpen)
	// Standard print setup command
	ON_COMMAND(ID_FILE_PRINT_SETUP, CWinApp::OnFilePrintSetup)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CDrawItApp construction

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

/////////////////////////////////////////////////////////////////////////////
// CDrawItApp initialization

BOOL CDrawItApp::InitInstance()
{
	BOOL retval = FALSE;

	__try {
		retval = DoInit();
	} __except(Mm::ExceptionFilter(GetExceptionInformation())) {
		ASSERT(0); // unreachable
	}

	return retval;
}


/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

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

// Dialog Data
	//{{AFX_DATA(CAboutDlg)
	enum { IDD = IDD_ABOUTBOX };
	//}}AFX_DATA

	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CAboutDlg)
	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
	//}}AFX_VIRTUAL

// Implementation
protected:
	//{{AFX_MSG(CAboutDlg)
		// No message handlers
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
public:
	CRichEditCtrl m_ctrlContent;
	virtual BOOL OnInitDialog();
};

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

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CAboutDlg)
	//}}AFX_DATA_MAP
	DDX_Control(pDX, IDC_CONTENT, m_ctrlContent);
}

BOOL CAboutDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	return TRUE;  // return TRUE unless you set the focus to a control
	// EXCEPTION: OCX Property Pages should return FALSE
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
	//{{AFX_MSG_MAP(CAboutDlg)
		// No message handlers
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

// App command to run the dialog
void CDrawItApp::OnAppAbout()
{
	CAboutDlg aboutDlg;
//	CDHtmlDialog aboutDlg(IDD_ABOUTBOX);
//	aboutDlg.m_nHtmlResID = IDR_ABOUT_CONTENT;
	aboutDlg.DoModal();
}

/////////////////////////////////////////////////////////////////////////////
// CDrawItApp message handlers

DrawFunctionMap g_drawFunctions;

unsigned int AddDrawFunc(const CLIENTCALLBACKS* cb)
{
	unsigned int index = g_drawFunctions.size();
	g_drawFunctions[index] = *cb;
	return index;
}

BOOL CDrawItApp::DoInit()
{
	// 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("DrawIt"));

	LoadStdProfileSettings(5);  // Load standard INI file options (including MRU)

	// Load DLLs containing the code to draw and manipulate shapes, by default
	// this application doesn't have any shapes defined.
	//
//	Mm::InitSpaceZero();

	HMODULE h = ::LoadLibrary("DrawFunc.dll");
	if (h == NULL) {
		::MessageBox(NULL, "Failed to load DrawFunc.dll", "DrawIt.exe Cannot Start", MB_OK | MB_ICONEXCLAMATION);
	}

	PFNDLLINIT pfnInit = (PFNDLLINIT)::GetProcAddress(h, lpzDrawDLLInit);
	(*pfnInit)(AddDrawFunc);

	// Register the application's document templates.  Document templates
	//  serve as the connection between documents, frame windows and views.

	CSingleDocTemplate* pDocTemplate;
	pDocTemplate = new CSingleDocTemplate(
		IDR_MAINFRAME,
		RUNTIME_CLASS(CDrawItDoc),
		RUNTIME_CLASS(CMainFrame),       // main SDI frame window
		RUNTIME_CLASS(CDrawItView));
	AddDocTemplate(pDocTemplate);

	// Parse command line for standard shell commands, DDE, file open
	CCommandLineInfo cmdInfo;
	ParseCommandLine(cmdInfo);

	// Dispatch commands specified on the command line
	if (!ProcessShellCommand(cmdInfo))
		return FALSE;


	// The one and only window has been initialized, so show and update it.
	m_pMainWnd->ShowWindow(SW_SHOW);
	m_pMainWnd->UpdateWindow();

	return TRUE;
}

int CDrawItApp::Run() 
{
	int retval = 0;
	__try {
		retval = CWinApp::Run();
	} __except(Mm::ExceptionFilter(GetExceptionInformation())) {
		ASSERT(0); // unreachable
	}	
	return retval;
}

int CDrawItApp::ExitInstance() 
{
	Mm::ClearAll();
	
	return CWinApp::ExitInstance();
}

void CDrawItApp::UpdateAllDocViews(void)
{
	POSITION posDT = GetFirstDocTemplatePosition();
	while (posDT) {
		CDocTemplate* pDT = GetNextDocTemplate(posDT);
		POSITION posD = pDT->GetFirstDocPosition();
		while (posD) {
			CDocument* pDoc = pDT->GetNextDoc(posD);
			pDoc->UpdateAllViews(NULL);
		}
	}
}