Multiple Views for a Single Document (MDI)

I add here the code that could be used to add multiple views to a document, in a MDI application. I usually make database applications, and I don’t want that the document to be created/destroyed by the framework, so I create the document myself (and of course I destroy it J ), and in document’s constructor I set the m_bAutoDelete flag to FALSE.

The CMyApp class contains as public member a pointer to my document. I also make document templates for all views, and I keep the pointers in CMyApp. You should have something like this in InitInstance():

m_pView1Templ=new CMultiDocTemplate( IDR_VIEW1TYPE,
RUNTIME_CLASS( CMyDoc ),
RUNTIME_CLASS( CChildFrame ),
RUNTIME_CLASS( CView1 ) );
AddDocTemplate(m_pView1Templ);
// m_pView1Templ is member of CMyApp

After you created all necessary document templates, add the following code:

// create main MDI Frame window
CMainFrame* pMainFrame = new CMainFrame;
mp_doc=new CTimeClkDoc;
mp_doc->SetTitle(“Just a demo”);
CCreateContext context;
context.m_pCurrentDoc=mp_doc;
context.m_pNewViewClass=NULL;
context.m_pNewDocTemplate=NULL;
context.m_pLastView=NULL;
context.m_pCurrentFrame=NULL;
if (!pMainFrame->LoadFrame(IDR_MAINFRAME,WS_OVERLAPPEDWINDOW |
                           FWS_ADDTOTITLE,NULL, &context ))
   return FALSE;
m_pMainWnd = pMainFrame;

This code will allow opening the application without any open view and also avoids the dialog box that asks to choose a document template. Add for each view command handlers similar with this one:

void CMyApp::OnView1()
{
   // TODO: Add your command handler code here
   CChildFrame* pFrame = new CChildFrame();
   CCreateContext context;
   context.m_pCurrentDoc=mp_doc;    //that’s the way I avoid creating
                                    //a new document every time I open
                                    //a new view
   context.m_pNewViewClass=RUNTIME_CLASS(CView1);
   context.m_pNewDocTemplate=m_pView1Templ;
   context.m_pLastView=(((CMainFrame *)m_pMainWnd)->
                        GetActiveFrame() ? ((CMainFrame *)m_pMainWnd)->
                        GetActiveFrame()->GetActiveView() : NULL);
   context.m_pCurrentFrame=((CMainFrame *)m_pMainWnd)->GetActiveFrame();
   if (!pFrame->LoadFrame(IDR_VIEW1TYPE,WS_OVERLAPPEDWINDOW |
                          FWS_PREFIXTITLE ,m_pMainWnd, &context ))return;
   pFrame->InitialUpdateFrame(mp_doc,TRUE);
}