MFC多文档-视结构学习笔记(学习《深入浅出MFC》)

MFC 多文档-视图的 数据结构：

1.CWinApp 的成员变量 CDocManager* m_pDocManager 管理模板
2.CDocManager 的成员变量 CPtrList m_templateList 维护结构模板 CMultiDocTemplate new的对象指针
3.CDocMultiTemplate 的成员变量 CRuntimeClass* m_pDocClass,m_pViewClass,m_pFrameClass 用来动态创建，另外还有一个资源ID对应资源文件中的内容
4.CDocument 的成员变量CDocTemplate * m_pDocTemplate，回指其DocumentTemplate；成员变量CPtrList m_viewList，同时维护一组Views。
CFrameWnd 的成员变量CView * m_pViewActive，指向当前活动的View。
CView 的成员变量CDocument * m_pDocument，指向对应的Document。
NOTE:从数据结构看，文档对应的多个View,没有Frame链表，如果要多个Frame只能手工增加。

新建过程调用关系：
1.模板在WinApp::InitInistance 中创建，并加到CWinApp::m_pDocManager->m_templateList 中
2.新建时，WinApp::OnFileNew()
3.调用WinApp中 CDocManager::OnFileNew();
4.调用 CMultiDocTemplate::OnDocumentFile( LPCTSTR lpszFileName ); 需要创建的对象就是成员变量CRuntimeClass指针

CMultiDocTemplate::OnDocumentFile中具体的新建过程（参数 lpszFileName用来区分是新建还是打开）：
1.CreateNewDocument()新建一个Doc对象，并加到CMultiDocTemplate的成员变量 CPtrList m_docList中, 用到RuntimeClass* m_pDocClass
2.CreateNewFrame(pDocument, NULL);新建一个Frame对象，把Doc的对象指针传给Frame
2.1在新建Frame对象后，LoadFrame函数创建Frame窗口，在Frame窗口的WM_CREATE消息响应中创建(Helper), Client，在CLient中CreateView(CCreateContext*pContext, UINT nID)创建View，
用到RuntimeClass* m_pFrameClass,m_pViewClass,资源ID，还有之前的pDocument

一个文档对应多个视窗的情况
新建视窗3元组合，是WinApp的模板对象的OnDocumentFile( LPCTSTR lpszFileName );用不同的模板对象就能创建不同的窗口，每次调用都会新建一个Doc对象。也就是不同源的窗口。
如果要建立同源的多个视窗，也就是对应同一个DOC，则在创建另一个Frame时，首先要获取活动对象的doc指针。用doc指针做参数创建另一个Frame。
1.CMDIChildWnd* pActiveChild = ((CMainFrame*)m_pMainWnd)->MDIGetActive(); //得到活动窗口
2.CDocument* pDocument = pActiveChild->GetActiveDocument(); //得到doc指针
3.CMultiDocTemplate* pDocTemplate = ((CMT1App*)AfxGetApp())->m_pDocTemplate2; //若不在CWinApp
4.CFrameWnd* pFrame = pDocTemplate->CreateNewFrame(pDocument, pActiveChild); //创建窗口
5.pDocTemplate->InitialUpdateFrame(pFrame, pDocument); //初始视图显示窗口？？

 

 

 主要的程序段：MT1.cpp

// MT1.cpp : Defines the class behaviors for the application.
//

#include "pch.h"
#include "framework.h"
#include "afxwinappex.h"
#include "afxdialogex.h"
#include "MT1.h"
#include "MainFrm.h"

#include "ChildFrm.h"
#include "MT1Doc.h"
#include "MT1View.h"
#include "CMyView2.h"
#include "CMyChildFrm2.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// CMT1App

BEGIN_MESSAGE_MAP(CMT1App, CWinApp)
    ON_COMMAND(ID_APP_ABOUT, &CMT1App::OnAppAbout)
    // 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)
    ON_COMMAND(ID_FILE_NEW, &CMT1App::OnFileNew)
END_MESSAGE_MAP()


// CMT1App construction

CMT1App::CMT1App() noexcept
{

    // support Restart Manager
    m_dwRestartManagerSupportFlags = AFX_RESTART_MANAGER_SUPPORT_ALL_ASPECTS;
#ifdef _MANAGED
    // If the application is built using Common Language Runtime support (/clr):
    //     1) This additional setting is needed for Restart Manager support to work properly.
    //     2) In your project, you must add a reference to System.Windows.Forms in order to build.
    System::Windows::Forms::Application::SetUnhandledExceptionMode(System::Windows::Forms::UnhandledExceptionMode::ThrowException);
#endif

    // TODO: replace application ID string below with unique ID string; recommended
    // format for string is CompanyName.ProductName.SubProduct.VersionInformation
    SetAppID(_T("MT1.AppID.NoVersion"));

    // TODO: add construction code here,
    // Place all significant initialization in InitInstance
}

// The one and only CMT1App object

CMT1App theApp;


// CMT1App initialization

BOOL CMT1App::InitInstance()
{
    // InitCommonControlsEx() 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.
    INITCOMMONCONTROLSEX InitCtrls;
    InitCtrls.dwSize = sizeof(InitCtrls);
    // Set this to include all the common control classes you want to use
    // in your application.
    InitCtrls.dwICC = ICC_WIN95_CLASSES;
    InitCommonControlsEx(&InitCtrls);

    CWinApp::InitInstance();


    // Initialize OLE libraries
    if (!AfxOleInit())
    {
        AfxMessageBox(IDP_OLE_INIT_FAILED);
        return FALSE;
    }

    AfxEnableControlContainer();

    EnableTaskbarInteraction(FALSE);

    // AfxInitRichEdit2() is required to use RichEdit control
    // AfxInitRichEdit2();

    // 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
    CMultiDocTemplate* pDocTemplate;
    pDocTemplate = new CMultiDocTemplate(IDR_MT1TYPE,
        RUNTIME_CLASS(CMT1Doc),
        RUNTIME_CLASS(CChildFrame), // custom MDI child frame
        RUNTIME_CLASS(CMT1View));
    if (!pDocTemplate)
        return FALSE;
    AddDocTemplate(pDocTemplate);
    m_pDocTemplate1 = pDocTemplate;
    
    pDocTemplate = new CMultiDocTemplate(IDR_MT1TYPE,
        RUNTIME_CLASS(CMT1Doc),
        RUNTIME_CLASS(CMyChildFrm2), // custom MDI child frame
        RUNTIME_CLASS(CMyView2));
    if (!pDocTemplate)
        return FALSE;
    //AddDocTemplate(pDocTemplate);
    
    m_pDocTemplate2 = pDocTemplate;


    // create main MDI Frame window
    CMainFrame* pMainFrame = new CMainFrame;
    if (!pMainFrame || !pMainFrame->LoadFrame(IDR_MAINFRAME))
    {
        delete pMainFrame;
        return FALSE;
    }
    m_pMainWnd = pMainFrame;

    // 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;
}

int CMT1App::ExitInstance()
{
    //TODO: handle additional resources you may have added
    AfxOleTerm(FALSE);

    return CWinApp::ExitInstance();
}

// CMT1App message handlers

// CAboutDlg dialog used for App About

class CAboutDlg : public CDialogEx
{
public:
    CAboutDlg() noexcept;

// Dialog Data
#ifdef AFX_DESIGN_TIME
    enum { IDD = IDD_ABOUTBOX };
#endif

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

// Implementation
protected:
    DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() noexcept : CDialogEx(IDD_ABOUTBOX)
{
}

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

BEGIN_MESSAGE_MAP(CAboutDlg, CDialogEx)
END_MESSAGE_MAP()

// App command to run the dialog
void CMT1App::OnAppAbout()
{
    CAboutDlg aboutDlg;
    aboutDlg.DoModal();
}

// CMT1App message handlers


void CMT1App::OnFileNew()
{
    // TODO: Add your command handler code here
    //CWinApp::OnFileNew();
    
    m_pDocTemplate1->OpenDocumentFile(NULL); //会创建一个新的 DOC对象，放在m_docList中
    
    //创建不同源的窗口
    //m_pDocTemplate2->OpenDocumentFile(NULL); //会创建一个新的 DOC对象，放在m_docList中
    

  //创建同源的窗口

   CMDIChildWnd* pActiveChild = ((CMainFrame*)m_pMainWnd)->MDIGetActive(); //得到活动窗口

   CDocument* pDocument = pActiveChild->GetActiveDocument(); //得到doc指针 

   //CMultiDocTemplate* pDocTemplate = ((CMT1App*)AfxGetApp())->m_pDocTemplate2; //若不在CWinApp 
    CFrameWnd* pFrame = m_pDocTemplate2->CreateNewFrame(pDocument, pActiveChild); //创建窗口 
    m_pDocTemplate2->InitialUpdateFrame(pFrame, pDocument); //初始视图显示窗口？？  

}