Calling View inside view in MFC

Question

Calling View inside view in MFC

ashish khowal 6

Hi Experts,

I am having one MFC App class with multidoctemplate initialized (AView+ADoc+CFrame) and (BView+BDoc+CFrame). Now in the ondraw() method of AView class , I want to initialize/call BView class such that from the onDraw() of AView can call onopendocument of BDoc class and then oninitialupdate and ondraw() of BView class. Can someone suggest if it is possible and if yes then how to do it.

Ideally this flow should be done automatic but due to the nature of the structure of the code i have to do manual calling of onOpenDocument of BDoc , but it was failing in ondraw of BView class. Can someone suggest how to approach it correctly?

Guido Franzke 2,191 Reputation points

2022-09-15T06:08:59.547+00:00

Did my answers help you? If yes, please mark the answers that helped you. Then other programmers can solve it when they have the same problem. If no, reply on the answers to get more help. Regards, Guido

YujianYao-MSFT 4,296 Microsoft External Staff

Hi @Ashish-556,

For how to add new views, I recommend you to read this issue.

CView *pActiveView = ((CFrameWnd *)m_pMainWnd)->GetActiveView();  
m_pOldView = pActiveView;  
m_pNewView = (CView *)new CNewView;  
if (NULL == m_pNewView)  
   return FALSE;  
  
CDocument *pCurrentDoc = ((CFrameWnd *)m_pMainWnd)->GetActiveDocument();  
  

CCreateContext newContext;  
newContext.m_pNewViewClass = NULL;  
newContext.m_pNewDocTemplate = NULL;  
newContext.m_pLastView = NULL;  
newContext.m_pCurrentFrame = NULL;  
newContext.m_pCurrentDoc = pCurrentDoc;  
  

UINT viewID = AFX_IDW_PANE_FIRST + 1;  
CRect rect(0, 0, 0, 0); // Gets resized later.  

m_pNewView->Create(NULL, _T("AnyWindowName"), WS_CHILD, rect, m_pMainWnd, viewID, &newContext);  

m_pNewView->SendMessage(WM_INITIALUPDATE, 0, 0);

Guido Franzke 2,191 Reputation points

2022-09-19T10:13:37.597+00:00

Nice code for SDI. But he is already using MDI.

2 answers

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Guido Franzke 2,191 Reputation points

2022-09-15T06:08:59.547+00:00

Did my answers help you? If yes, please mark the answers that helped you. Then other programmers can solve it when they have the same problem. If no, reply on the answers to get more help. Regards, Guido
YujianYao-MSFT 4,296 Reputation points Microsoft External Staff

2022-09-19T07:03:06.467+00:00

Hi @Ashish-556,

For how to add new views, I recommend you to read this issue.

CView *pActiveView = ((CFrameWnd *)m_pMainWnd)->GetActiveView(); m_pOldView = pActiveView; m_pNewView = (CView *)new CNewView; if (NULL == m_pNewView) return FALSE; CDocument *pCurrentDoc = ((CFrameWnd *)m_pMainWnd)->GetActiveDocument(); CCreateContext newContext; newContext.m_pNewViewClass = NULL; newContext.m_pNewDocTemplate = NULL; newContext.m_pLastView = NULL; newContext.m_pCurrentFrame = NULL; newContext.m_pCurrentDoc = pCurrentDoc; UINT viewID = AFX_IDW_PANE_FIRST + 1; CRect rect(0, 0, 0, 0); // Gets resized later. m_pNewView->Create(NULL, _T("AnyWindowName"), WS_CHILD, rect, m_pMainWnd, viewID, &newContext); m_pNewView->SendMessage(WM_INITIALUPDATE, 0, 0);
Guido Franzke 2,191 Reputation points

2022-09-19T10:13:37.597+00:00

Nice code for SDI. But he is already using MDI.

Answer 1

And if you want to call OnOpenDocumentFile from AView, you must save the CMultiDocTemplate pointer to a member of your CWinApp class.
Like this:

class CMyApp : public CWinAppEx
{
public:
CMultiDocTemplate* m_pDocTemplateB;

}

in InitInstance save the pointer:
m_pDocTemplateB = new CMultiDocTemplate(IDR_xxxTYPE,
RUNTIME_CLASS(BDoc),
RUNTIME_CLASS(CFrame),
RUNTIME_CLASS(BView));
if (!m_pDocTemplateB) return FALSE;
AddDocTemplate(m_pDocTemplateB);
Whereever you want to create a new BView client window:
((CMyApp*)::AfxGetApp())->m_pDocTemplateB->OpenDocumentFile(NULL);

Regards, Guido

Answer 2

Hello,
you must search for the client view window of BView, like this:

 for (CMDIChildWnd* pChild = MDIGetActive(); pChild != NULL; pChild = (CMDIChildWnd*)pChild->GetWindow(GW_HWNDNEXT))  
 {  
   CRuntimeClass* prr = pChild->GetRuntimeClass(); if (!prr) continue;  
   if (CString(prr->m_lpszClassName) != L"CFrame") continue;  
   CDocument* ppp = pChild->GetActiveDocument(); if (!ppp) continue;  
   prr = ppp->GetRuntimeClass(); if (!prr) continue;  
   if (CString(prr->m_lpszClassName) == L"BDoc")  
   {  
     BDoc* pdoc = (BDoc*)ppp;  
     pChild->MDIActivate();  
     pChild->BringWindowToTop();  
     POSITION position = pdoc->GetFirstViewPosition();  
     if (position != NULL)  
     {  
       BView* pView = (BView*)pdoc->GetNextView(position);  
       if (pView != NULL) pView->CallYourFunction();  
     }  
     break;  
   }  
}

Regards, Guido

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Calling View inside view in MFC

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