RE: Clipping the MainFrame View with another View

From:

=?Utf-8?B?QVZlZQ==?= <AVee@discussions.microsoft.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Wed, 9 May 2007 14:47:00 -0700

Message-ID:

<1A6F507A-D35D-4954-A7F7-384B39408183@microsoft.com>

Thanks Mark. My authoritative "Win 32 Window Heirarchy and Styles" article
forgot to mention that WS_CHILD detail too. Per your request, I pasted my
PreCreateWindow() override below. Is it therefore NOT POSSIBLE to make one
frame window the child of another?

BOOL CNewFrm::PreCreateWindow(CREATESTRUCT& cs)
{
cs.style |= WS_EX_TOPMOST;
if( !CFrameWnd::PreCreateWindow(cs) )
return FALSE;
return TRUE;
}

"Mark Salsbery" wrote:

For WS_CHILD "A window with this style cannot have a menu bar"

Sorry about THAT one :)

Thanks for the code snippet. Can you post the code for your new frame's
PreCreateWindow() override?

Mark

"AVee" wrote:

Thanks, Mark.

Yes indeed. I want the new frame to stay on top of the main frame whether it
has focus or not. (That is a simpler way to put it. Thanks).

Yes, I have tried setting the styles in the PreCreateWindow() override, as
well as with the argument to LoadFrame(). I stand corrected: the view that is
attached to my new frame does indeed have the WS_CHILD attribute. The real
issue, therefore, is how to make my new frame a child of the main frame,
since LoadFrame() fails when I set the WS_CHILD child attribute, either from
the style argument in LoadFrame(), or later in PreCreateWindow().

Here is a snippet of the code I am using to create the new frame (without
the checks, for simplicity). A pointer to the new frame is a member of the
main frame. So - maybe the more appropriate question is "How do I make the
new frame a child of the main frame?"

//////
pDoc = pMainFrm->GetActiveDocument();
CCreateContext wcontext;
wcontext.m_pCurrentFrame = (CFrameWnd*)pMainFrm;
wcontext.m_pCurrentDoc = pDoc;
wcontext.m_pNewViewClass = RUNTIME_CLASS(CNewView);
wcontext.m_pNewDocTemplate = NULL;
CRuntimeClass* pNewFrameClass; // class for creating new frames
pNewFrameClass=RUNTIME_CLASS(CNewFrm);
pMainFrm->m_pNewFrm=(CNewFrm*)pNewFrameClass->CreateObject();
pMainFrm->m_pNewFrm->LoadFrame(
     NEW_FRAME_MENU_ID,
     WS_OVERLAPPEDWINDOW | FWS_ADDTOTITLE /*fails with | WS_CHILD */ ,
     NULL, &wcontext);
pMainFrm->m_pNewFrm->ActivateFrame( 1 );
//////

"Mark Salsbery" wrote:

Are you setting styles in a PreCreateWindow() override?

A view in a frame gets the WS_CHILD added to it by MFC.
For a frame window, to use the WS_CHILD style, you may need to create it
"manually" instead of the way you are doing it.

So by "clipping the main frame window" you mean you want it to stay on top
of the main frame whether it has focus or not?

Even a modeless dialog won't stay on top of another window unless it's a
child of that window.

"AVee" wrote:

I am using the flag on the new frame, and it launches it on top, at first
clipping the main frame window when it is in focus - but the desired affect
is to have it clip the main frame even when it goes out of focus (like a
modeless dialog window does). I tried making the new frame a child by OR'ing
in WS_CHILD to its style, but that makes CFrameWnd->Create() fail from within
LoadFrame(). I also noticed that CView doesn't accept a WS_CHILD style either.