Re: PreCreateWindow() & CListBox

From:
"Mark Salsbery [MVP]" <MarkSalsbery[MVP]@newsgroup.nospam>
Newsgroups:
microsoft.public.vc.mfc
Date:
Mon, 1 Oct 2007 11:20:16 -0700
Message-ID:
<e#lpGfFBIHA.4732@TK2MSFTNGP04.phx.gbl>
see below...

".rhavin grobert" <clqrq@yahoo.de> wrote in message
news:1191261448.049225.41790@y42g2000hsy.googlegroups.com...

In my CListBox-deriviation, i want to have some StyleFlags always set
before the Control is created. So I thought to overload
PreSubclassWindow() and PreCreateWindow(). The first one is called but
cant set LBS_OWNERDRAWVARIABLE, the PreCreateWindow() is not called at
all;-\

Can anyone explain why it is not called and what to do about it? I
definitively need a way to change the styleflags *after* the resources
are loaded and *before* the windows get created - wasn't
PreCreateWindow() meant exactly for that...?

- thanx for any insight -.rhavin;)

//-------------------------------------------------------------------
//
void CQListBox::PreSubclassWindow() {
CListBox::PreSubclassWindow();
ModifyStyle(LBS_HASSTRINGS | LBS_OWNERDRAWVARIABLE, LBS_USETABSTOPS |
LBS_NODATA | LBS_OWNERDRAWFIXED, true);
UpdateWindow();
}


It looks like you're removing the LBS_OWNERDRAWVARIABLE style and adding the
LBS_OWNERDRAWFIXED style.

You stated you can't set the LBS_OWNERDRAWVARIABLE style, so do you have
your parameters switched?

Also, the last param to ModifyStyle() is NOT a bool.

//-------------------------------------------------------------------
//
BOOL CQListBox::PreCreateWindow(CREATESTRUCT& cs) {
cs.style &= ~(LBS_HASSTRINGS | LBS_OWNERDRAWVARIABLE);
cs.style |= LBS_USETABSTOPS | LBS_NODATA | LBS_OWNERDRAWFIXED;
return CListBox::PreCreateWindow(cs);
}


I don't believe PreCreateWindow() will be called for a subclassed control
created from a dialog resource.

Mark

--
Mark Salsbery
Microsoft MVP - Visual C++

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