Re: Make client area of frame view a certain (fixed) size (AdjustWindowRectEx problem)

From:

WP <invalid@invalid.invalid>

Newsgroups:

microsoft.public.vc.mfc

Date:

Wed, 30 Jul 2008 23:20:05 +0200

Message-ID:

<6fc48bFat8i9U1@mid.individual.net>

Mark Salsbery [MVP] wrote:
[snip older posts]

**********************************************
You need to initialize the rect before passing it to ::AdjustWindowRectEx()

rect.left = 0;
rect.top = 0;
rect.right = 400;
rect.bottom = 400;
**********************************************

   BOOL b = ::AdjustWindowRectEx(&rect, WS_CAPTION | WS_BORDER |
WS_MINIMIZEBOX | WS_SYSMENU, 0, TRUE);

   cs.cx = 400;
   cs.cy = 400;

**********************************************
Then use the adjusted rect values:

cs.cx = rect.right - rect.left;
cs.cy = rect.bottom - rect.top;

Mark

Doh! You're right, I forgot that completely. The raw Win32 code did that
but I totally forgot it here. Anyway, I'm not completely there yet
because the client area of the frame view is only 396 * 396. First it
was 392*392 but I removed the extended style WS_EX_CLIENTEDGE that was
set in the view's PreCreateWindow. So it seems the view's non-client
area still takes up some space (4 pixels on each side to exact). How do
I account for that or remove it? I need this code to be portable, so I
can't just adjust it for my system. Here are both PreCreateWindow():s now:

BOOL DoubleBufferingMainFrame::PreCreateWindow(CREATESTRUCT& cs)
{
    VERIFY(CFrameWnd::PreCreateWindow(cs));

    CRect rect(0, 0, 400, 400);

    BOOL b = ::AdjustWindowRectEx(&rect, cs.style, cs.dwExStyle, TRUE);

    cs.cx = abs(rect.left) + abs(rect.right);
    cs.cy = abs(rect.top) + abs(rect.bottom);

    cs.lpszClass = AfxRegisterWndClass(0);

    return TRUE;
}

BOOL DoubleBufferingChildView::PreCreateWindow(CREATESTRUCT& cs)
{
    VERIFY(CWnd::PreCreateWindow(cs));

    //cs.dwExStyle |= WS_EX_CLIENTEDGE;
    cs.style &= ~WS_BORDER;
    cs.lpszClass = AfxRegisterWndClass(CS_HREDRAW|CS_VREDRAW|CS_DBLCLKS,
    ::LoadCursor(NULL, IDC_ARROW),
reinterpret_cast<HBRUSH>(COLOR_WINDOW+1), NULL);

    return TRUE;
}

Thanks for the quick replies btw, this newsgroup is really great! Fast,
quality replies - can't ask for more!

- Eric (WP)