Re: unable to display check/radio box with transparent background

From:

"Mark Salsbery [MVP]" <MarkSalsbery[MVP]@newsgroup.nospam>

Newsgroups:

microsoft.public.vc.mfc

Date:

Mon, 28 Jan 2008 14:24:08 -0800

Message-ID:

<E6FD97FC-0CF9-4615-BCBD-B056F7C1DD57@microsoft.com>

"Ian" <Ian@discussions.microsoft.com> wrote in message
news:5B4C43F0-79F9-4ADD-8640-1C4076DD58A1@microsoft.com...

I am not able to get check boxes/radio buttons to be displayed with a
transparent background in my dialogs. The general technique for
displaying
controls with transparent backgrounds is described in more than a few
postings (e.g.
http://groups.google.ca/group/microsoft.public.pocketpc.developer/browse_thread/thread/e5d77d8f30350f3a/22ea8e331b6cd993?lnk=st&q=dialog+bitmap+static+text+background+transparent#22ea8e331b6cd993 )
.

The general technique in MFC is as follows:

HBRUSH CInsDialog:nCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)

{

pDC->SetBkMode(TRANSPARENT);

return _brHollow; // this brush is defined elsewhere

}

This works well for most controls but not for checkboxes, radio buttons
and
tab controls - these controls alway have the standard windows 'grey'
background'. The last set of postings on this topic appear in 2002/2003
and I've not found anything since. Does anyone have a solution for this
'hiccup'? I am working with VS2005 running on Vista home premium.

You'll need to draw the controls yourself (owner drawn). You can get the
text to honor the WM_CTLCOLORxxx message but not if you're using common
controls v6. Even then, the background rect gets painted over.

Mark

--
Mark Salsbery
Microsoft MVP - Visual C++

Thanks,

Ian