Re: Inheritance and MFC

From:

"Nobody" <Nobody@yahoo.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Tue, 3 Jul 2007 22:55:56 -0700

Message-ID:

<uhXB$$fvHHA.4612@TK2MSFTNGP03.phx.gbl>

Hi Joe,

Well, if you made it a CObject, it is most definitely *not* =

independent of MFC! And the

concept of including it in an MFC class seems more than a little =

strange.

In fact, the "using ... a few other MFC functions" means you are =

already committed to MFC.

Yes, and No.
Yes, I have committed to using MFC, because that is what I am developing =
the project with.
No, because it is able to be used independent of MFC. (At least that is =
what I was trying to do.)

Yeah, your right, I need to clean it up somewhat to conform to do what I =
want, but I was holding that off for now.

I am a bit confused about segragating the class into independent =
"Seperately indentifiable" objects. Hence the post.
CGrid - Independent
CGridMFC - MFC Dependent - Only Serialization. (Does not need CWnd.)
CGridSB - MFC Dependent plus Scrollbars.

I suppose like David said, I can't go that route and I will have to just =
inherit from CWnd in the base class or the CGridMFC class.

Thanks anyways,
"Joseph M. Newcomer" <newcomer@flounder.com> wrote in message =
news:dc9m83dkbfgjg9gkj8itlkcrc33mhou1q7@4ax.com...

Well, if you made it a CObject, it is most definitely *not* =

independent of MFC! And the

concept of including it in an MFC class seems more than a little =

strange.

In fact, the "using ... a few other MFC functions" means you are =

already committed to MFC.

joe

On Tue, 3 Jul 2007 17:30:28 -0700, "Nobody" <Nobody@yahoo.com> wrote:

Hi Joe,

Why is a grid object not derived from CWnd in the first place?

I wanted to make the grid object independent of MFC.
The only reason I am using CObject is for Serialization.
I am using the registry and a few other MFC functions, OnDraw(), =

OnMouseMove(), etc.

I should actually make several layers, but it is what it is for now.

I noticed that the more I use the grid object, the more I have to keep =

adding scroll bars for pan, zoom, etc.

So, my idea was to make a CWnd GridSB Class that implements =

Scrollbars.

That class inherits from the Grid CObject class.
Then, I can leave the scroll bars inside of the CGrid Object, instead =

of Creating scroll bars each time.

This is basically what I have.

CGrid : public CObject

CGridSB: public CGrid, public CWnd
{
   CScrollbar sb;
   CreateScrollbars();
   SetScreenRect(){ Position Scrollbars(); }
}

CView::OnDraw()
{
   CGridSB sb;
   sb.SetScreenRect(Rect);
   sb.OnDraw(pDC);
}

Regards,
"Joseph M. Newcomer" <newcomer@flounder.com> wrote in message =

news:hndk83t2i52oo7o21fhrt0jpj8f5vn97u7@4ax.com...

Multiple inheritance is chancy in MFC. At least one rule is the =

CWnd class must be the

first class. But in this case, I don't see how a visible object =

like a grid could *not*

derive directly from CWnd, and since CWnd derives from CObject, =

there is no need for the

inheritance from CObject in the first place.

Why is a grid object not derived from CWnd in the first place?
joe
On Tue, 3 Jul 2007 02:49:21 -0700, "Nobody" <Nobody@yahoo.com> =

wrote:

Hi,

I have a grid object. The Grid Object inherits from CObject.
There are no controls and I was thinking about adding some. Zoom, =

Pan, etc.

So, I have extantiated a new class that inherits from CGrid and =

CWnd.

class CGridSB : public CGrid, public CWnd

Now, I would like to add some controls to the Grid Object.
The problem is that the controls needs an m_hWnd
I am not sure what to do?

VERIFY(c_sbHZoom.Create(
     SBS_VERT | SBS_RIGHTALIGN | WS_CHILD |WS_BORDER,
  Rect,
  this,
  1234)
);

_AFXWIN_INLINE void CScrollBar::ShowScrollBar(BOOL bShow)
{ ASSERT(::IsWindow(m_hWnd)); ::ShowScrollBar(m_hWnd, SB_CTL, =

bShow); }

I understand that the CGridSB oject needs to handle the Scrollbar =

messages, so I need a message map

and perphaps a DECLARE_DYNCREATE along with an IMPLEMENT_DYNCREATE =

member.

I just need to get past the m_hWnd error.

Thanks for your help,

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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