C++ MFC MDI data as Document not on disk [closed] - c++

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I would like to use MFC MDI but my data (Document) is not on the disk.
I have functions that generate data according to the input.
Data of type A, type B etc.
I would like to open a new tab for every new data generated.
For example, if the input of the generated data is X, I would like to open a new tab with the name X on it. If the X exists, I would like to activate (bring front) the X tab as the MDI already does.
My idea is to have multiple CMultiDocTemplate. Each one generated by different CDocument/CView derived class.
I am looking for a solution to overload the open/new function so instead of opening a file from disk, ask from my functions to generate the data (CDocument).
Also, I don't want the user to choose between CMultiDocTemplate/Cview but I want to choose which one to use for the new tab.

Answer 1

I am not sure if this is what you might be looking for, but I used code like this to change the view to a different one based on the document being loaded:
BOOL CCommunityTalksDoc::SwitchToView(CRuntimeClass* pNewViewClass)
{
POSITION rPos;
CView *pOldActiveView;
CFrameWnd *pChild;
CCreateContext context;
BOOL bAutoDelete;
rPos = GetFirstViewPosition();
pOldActiveView = GetNextView(rPos);
pChild = pOldActiveView->GetParentFrame();
// If we're already displaying this kind of view, no need to go further.
if (pOldActiveView->IsKindOf(pNewViewClass))
return TRUE;
// Set flag so that document will not be deleted when view is destroyed.
bAutoDelete = m_bAutoDelete;
m_bAutoDelete = FALSE;
// Delete existing view
pOldActiveView->DestroyWindow();
// restore flag
m_bAutoDelete = bAutoDelete;
// Create new view.
m_pScriptView = (CScriptParseView*)pNewViewClass->CreateObject();
if (m_pScriptView == nullptr)
{
TRACE1("Warning: Dynamic create of view type %s failed\n", pNewViewClass->m_lpszClassName);
return FALSE;
}
// we must ensure the popup dialogues don't display
m_pScriptView->SetBuildMode(FALSE);
// Draw new view.
context.m_pNewViewClass = pNewViewClass;
context.m_pCurrentDoc = this;
context.m_pNewDocTemplate = nullptr;
context.m_pLastView = nullptr;
context.m_pCurrentFrame = pChild;
if (!m_pScriptView->Create(nullptr, nullptr, AFX_WS_DEFAULT_VIEW, CRect(0, 0, 0, 0),
pChild, AFX_IDW_PANE_FIRST, &context))
{
TRACE0("Warning: couldn't create view for frame\n");
delete m_pScriptView;
m_pScriptView = nullptr;
return FALSE;
}
m_pScriptView->SendMessage(WM_INITIALUPDATE, 0, 0); // WM_INITIALUPDATE is defined in afxpriv.h
pChild->RecalcLayout();
m_pScriptView->UpdateWindow();
pChild->SetActiveView(m_pScriptView);
return TRUE;
}
You use it like:
CRuntimeClass *pNewViewClass = RUNTIME_CLASS(CScriptParseView);
if (!SwitchToView(pNewViewClass))
{
// fail, don't know why it would fail
ASSERT(FALSE);
}