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An CMultiDocTemplate extension

, 1 Sep 2002 CPOL
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A more real Document Template Class

Introduction

When we build and run an MFC MDI application, it initially opens a new empty document for us. Then when we open an existing document, it creates a new frame and opens the document in that frame. But I feel that it will be more kindly if it just replaces the unmodified empty document and open the existing document in the same frame. So I decided to derive a new class from CMultiDocTemplate and name it CMultiDocTemplateEx to do such things.

I just overrode OpenDocumentFile(LPCTSTR lpszPathName, BOOL bMakeVisible), before directly calling the base class's OpenDocumentFile() method. I made some test. If there is only ONE document and it is UNMODIFIED, I call the document's OnOpenDocument() with lpszPathName, and call it's SetPathName(). Any other case, we call CMultiDocTemplate::OpenDocumentFile() directly. The code is quite straightforward.

CDocument* CMultiDocTemplateEx::OpenDocumentFile(LPCTSTR lpszPathName,
                                                    BOOL bMakeVisible)
{
    if (m_docList.GetCount() == 1)
    {
        CDocument* pDocument = (CDocument*)m_docList.GetHead();
        if (pDocument->GetPathName().IsEmpty() && !pDocument->IsModified())
        {
            CWaitCursor wait;
            if (!pDocument->OnOpenDocument(lpszPathName))
            {
                TRACE0("CDocument::OnOpenDocument returned FALSE.\n");
                return NULL;
            }
            pDocument->SetPathName(lpszPathName);
            POSITION pos = pDocument->GetFirstViewPosition();
            CView* pView = pDocument->GetNextView(pos);
            CFrameWnd* pFrame = pView->GetParentFrame();
            InitialUpdateFrame(pFrame, pDocument);
            return pDocument;
        }
    }
    return CMultiDocTemplate::OpenDocumentFile(lpszPathName, bMakeVisible);
}

Do not know how to use it? Okay, add MultiDocTemplateEx.cpp and MultiDocTemplateEx.h to your project and include the header in your stdafx.h like this

#include "MultiDocTemplateEx.h"

Then in the InitInstance, change CMultiDocTemplate to CMultiDocTemplateEx, or just add "Ex" after that word, build, run, test it!

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Yi Yang
Web Developer
China China
I love tech!

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Comments and Discussions

 
GeneralGood job Pin
Kony Han8-Mar-06 16:18
memberKony Han8-Mar-06 16:18 
GeneralRe: Good job Pin
Yi Yang8-Mar-06 17:43
memberYi Yang8-Mar-06 17:43 
Generalopen a different documents in MDI application without the first window blank Pin
si197274-Jul-03 6:10
membersi197274-Jul-03 6:10 
GeneralBug Fixed Pin
Yi Yang1-Sep-02 20:01
memberYi Yang1-Sep-02 20:01 
GeneralSimilar article Pin
Warren Stevens29-Aug-02 5:11
memberWarren Stevens29-Aug-02 5:11 
GeneralRe: Similar article Pin
Yi Yang29-Aug-02 19:19
memberYi Yang29-Aug-02 19:19 
GeneralAnother option Pin
Dimitris Vassiliades28-Aug-02 14:29
memberDimitris Vassiliades28-Aug-02 14:29 
GeneralRe: Another option Pin
Yi Yang28-Aug-02 19:06
memberYi Yang28-Aug-02 19:06 
GeneralRe: Another option Pin
Dimitris Vassiliades4-Jul-03 7:10
memberDimitris Vassiliades4-Jul-03 7:10 
GeneralPossible problem Pin
Roger Allen27-Aug-02 23:21
memberRoger Allen27-Aug-02 23:21 
GeneralRe: Possible problem Pin
Yi Yang28-Aug-02 19:10
memberYi Yang28-Aug-02 19:10 
GeneralRe: Possible problem Pin
Yi Yang28-Aug-02 19:21
memberYi Yang28-Aug-02 19:21 

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