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

// SplitSVDIDoc.cpp : implementation of the CSplitSVDIDoc class
//

#include "stdafx.h"
#include "SplitSVDI.h"

#include "SplitSVDIDoc.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// CSplitSVDIDoc

IMPLEMENT_DYNCREATE(CSplitSVDIDoc, CDocument)

BEGIN_MESSAGE_MAP(CSplitSVDIDoc, CDocument)
END_MESSAGE_MAP()


// CSplitSVDIDoc construction/destruction

CSplitSVDIDoc::CSplitSVDIDoc()
{
	// TODO: add one-time construction code here

}

CSplitSVDIDoc::~CSplitSVDIDoc()
{
}

BOOL CSplitSVDIDoc::OnNewDocument()
{
	if (!CDocument::OnNewDocument())
		return FALSE;

	// TODO: add reinitialization code here
	// (SDI documents will reuse this document)

	return TRUE;
}




// CSplitSVDIDoc serialization

void CSplitSVDIDoc::Serialize(CArchive& ar)
{
	if (ar.IsStoring())
	{
		// TODO: add storing code here
	}
	else
	{
		// TODO: add loading code here
	}
}


// CSplitSVDIDoc diagnostics

#ifdef _DEBUG
void CSplitSVDIDoc::AssertValid() const
{
	CDocument::AssertValid();
}

void CSplitSVDIDoc::Dump(CDumpContext& dc) const
{
	CDocument::Dump(dc);
}
#endif //_DEBUG



void CSplitSVDIDoc::OnChangedViewList()
{
	//CDocument::OnChangedViewList();
	// The default implementation calls OnCloseDocument if there is no associated views;
	// we want to prevent this
	// See CDocument::OnChangedViewList, doccore.cpp

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

void CSplitSVDIDoc::OnCloseDocument()
{
	//CDocument::OnCloseDocument();
	// The default implementation destroys all frames viewing this document;
	// we want to do something different: if there are some other documents,
	// one of them is displayed in the view; otherwise the view is destroyed.
	// See CDocument::OnCloseDocument, doccore.cpp

	// Common new code
	if (!m_viewList.IsEmpty()) {
		// There is one or several views (normally one only)

		// Seraching for another open document
		CDocument* pOtherDoc = NULL;
		POSITION pos = m_pDocTemplate->GetFirstDocPosition();
		while (pos != NULL) {
			pOtherDoc = m_pDocTemplate->GetNextDoc(pos);
			if (pOtherDoc == NULL)
				break;	// No more open doc
			if (pOtherDoc == this)
				pOtherDoc = NULL;
			else
				break;	// Open document found
		}

		CView* pView = NULL;
		if (pOtherDoc != NULL) {
			// Connect all views to this document
			pos = m_viewList.GetHeadPosition();
			while (pos != NULL) {
				pView = (CView*)m_viewList.GetNext(pos);
				this->RemoveView(pView);
				pOtherDoc->AddView(pView);
				pView->SendMessage(_afxMsgUpdateView);
			}
		}
		else {
			// Destroy all views
			pos = m_viewList.GetHeadPosition();
			while (pos != NULL)	{
				pView = (CView*)m_viewList.GetNext(pos);

				// Special case of splitter window
				CSplitterWnd* pSplitter = CView::GetParentSplitter(pView, TRUE);
				if (pSplitter != NULL) {
					// Destroy splitter window; we assume here that splitter window contains all views
					pSplitter->DestroyWindow();
					break;
				}

				// Destroy view
				pView->DestroyWindow();
			}

			// The view object will be destroyed in CView::PostNcDestroy()

			CFrameWnd* pFrame = (CFrameWnd*)AfxGetApp()->m_pMainWnd;
			if (pFrame != NULL)	{
				ASSERT_KINDOF(CFrameWnd, pFrame);

				// Update frame title
				pFrame->OnUpdateFrameTitle(TRUE);

				// Redraw entire frame window
				pFrame->RedrawWindow(NULL, NULL, RDW_INVALIDATE | RDW_UPDATENOW | RDW_ERASE | RDW_ALLCHILDREN);
			}
		}
	} // if (!m_viewList.IsEmpty()

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


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


// CSplitSVDIDoc commands