SDI application with multiple views active

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Hi,
I am creating an sample learning application to create multiple active views at the same time in an SDI. The problem that i am facing is, though i have overridden the OnDraw in my second view class, my call to the SetModifiedFlag(true) and UpdateAllViews(), is not invoking the second views OnDraw(). I debugged into the UpdateAllviews and i could see my second view's OnUpdate is getting called successfully with all parameters 0. What is it that i am missing? please can any one help

Code looks something like this

CMainWnd::CMainWnd()
{
    m_pSecondWnd = new CSecondaryWnd();
    m_pSecondWnd->Create( 0, L"Second Window", WS_OVERLAPPEDWINDOW );
}
void CMainWnd::CreateNewView( CRuntimeClass* pView, CFrameWnd* pNewWnd, UINT ID)
{
    CView* pNewView = NULL;
    pNewView = (CView*)pView->CreateObject();
    CCreateContext context;
    context.m_pCurrentDoc = GetActiveDocument();
    pNewView->Create( 0, 0, AFX_WS_DEFAULT_VIEW, rectDefault, pNewWnd, 1 , &context );
    pNewView->OnInitialUpdate();

    ((CSecondaryWnd*)pNewWnd)->ShowWindow( SW_RESTORE );
    pNewView->ShowWindow( SW_RESTORE );
    pNewWnd->UpdateWindow();
}

void CMainWnd::OnTimer( UINT_PTR nIDEvent )
{
    switch(nIDEvent)
    {
    case ONE_SECOND_TIMER:
        {
            CSampleDocument* pDoc = (CSampleDocument*)GetActiveDocument();
            pDoc->SetModifiedFlag();
            pDoc->UpdateAllViews( NULL );
            //Invalidate(); trail
            break;
        }
    }
}

Sample View 2 class:

IMPLEMENT_DYNCREATE( CSampleView2, CView )

BEGIN_MESSAGE_MAP( CSampleView2, CView )
END_MESSAGE_MAP()

CSampleView2::CSampleView2()
{
}

CSampleView2::~CSampleView2()
{
}


void CSampleView2::OnDraw( CDC* pDc )
{
    int a = 10;
    pDc->TextOut( 100, 100, L"This", 5 );
}


Sample View 1 Class:
IMPLEMENT_DYNCREATE( CSampleView1, CView )

BEGIN_MESSAGE_MAP( CSampleView1, CView )
    ON_COMMAND( ID_VIEW_CREATE, OnViewCreate )
END_MESSAGE_MAP()

CSampleView1::CSampleView1()
{
}

CSampleView1::~CSampleView1()
{
}

void CSampleView1::OnDraw( CDC* pDc )
{
    pDc->TextOut( 100, 100, L"This", 5 );int a = 10;
}

What I have tried:

Debugged UpdateAllView and i could see while looping through the different views, my second view calss and it OnUpdate is getting called successfully.

Posted 12-Sep-17 14:55pm

kuttiylajai

Updated 12-Sep-17 20:31pm

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

Richard MacCutchan · Accepted Answer · 2017-09-12T20:31:00

Solution 1

See CDocument::UpdateAllViews (MFC)[^] for the correct method of updating views.

Posted 12-Sep-17 20:31pm

Richard MacCutchan

Comments

kuttiylajai 13-Sep-17 15:59pm

I read the documentation CDocument::UpdateAllViews (MFC)[^] and it was mentioning that "You typically call this function from your view class after the user has changed the document through a view."
I changed the code as per that to
void CSampleView1::OnViewCreate()
{
CRuntimeClass* second_view = RUNTIME_CLASS( CSampleView2 );
CMainWnd* pMainWnd = (CMainWnd*)AfxGetApp()->GetMainWnd();
pMainWnd->CreateNewView( second_view, pMainWnd->GetMainWnd(), 1 );
}

void CSampleView1::UpdateViewsToReflectChanges()
{
CSampleDocument* pDoc = (CSampleDocument*)((CFrameWnd*)(AfxGetApp()->GetMainWnd()))->GetActiveDocument();
pDoc->SetModifiedFlag();
pDoc->UpdateAllViews( NULL );
}
But the answer is same. I am not getting control in my OnDraw of the secondView class

SDI application with multiple views active

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SDI application with multiple views active

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