Re: Owner-Draw Round Button

From:

=?Utf-8?B?c2F3ZXI=?= <sawer@discussions.microsoft.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Mon, 20 Jul 2009 11:08:02 -0700

Message-ID:

<DFD781FF-9C20-46CF-A767-A1CB5B83FCB4@microsoft.com>

Yes you did. So your program didn't allow to paint. There is a round button.

                //This is OK.
    CDC *pDC = CDC::FromHandle(lpDrawItemStruct->hDC);
    CRect rect = lpDrawItemStruct->rcItem;
    CRgn rgn;
    rgn.CreateEllipticRgnIndirect(&rect);
                //If I doesn't call SelectClipRgn there is a rectangle
button
    pDC->SelectClipRgn(&rgn);
    pDC->FillSolidRect(&rect, RGB(255,0,0));

But in MSDN, it writes:
"The window region determines the area within the window where the system
permits drawing. The system does not display any portion of a window that
lies outside of the window region "

So can we say this is not completly right?
Because if someone sets region of a window but doesn't make clipping, system
still displays outside of the window region.

"Joseph M. Newcomer" wrote:

Take a look at what I did for the "CAT" buttons in my SetWindowRgn example; they are
owner-draw buttons. I may have done clipping.
joe

On Mon, 20 Jul 2009 09:26:01 -0700, sawer <sawer@discussions.microsoft.com> wrote:

I am just trying to understand why this simple code isn't working:

void CMyButton::PreSubclassWindow()
{
    CRect rect;
    GetClientRect(&rect);
    CRgn rgn;
    rgn.CreateEllipticRgnIndirect(&rect);
    SetWindowRgn(rgn, TRUE);
    rgn.Detach();
    CButton::PreSubclassWindow();
}

void CMyButton::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
    CDC *pDC = CDC::FromHandle(lpDrawItemStruct->hDC);
    CRect rect = lpDrawItemStruct->rcItem;
    pDC->FillSolidRect(&rect, RGB(255,0,0));
}

I made an elliptic region in PreSubclassWindow() and then called to
FillSolidRect().

Why is there a rectangle button? Why are top corners seen?
Thanks.

Joseph M. Newcomer [MVP]
email: newcomer@flounder.com
Web: http://www.flounder.com
MVP Tips: http://www.flounder.com/mvp_tips.htm

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