Re: How to add a Dialog in a View

"Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp>
Sun, 18 Jan 2009 23:52:46 -0500
Do not ever call OnDraw. The framework will call it for you. You will see
that OnUpdate calls Invalidate. That causes the framework to call OnDraw.

The sample code you are hoping to imitate is very different from OnDraw.
Instead of using lpDrawItemStruct->hDC you should use the CDC* that is
passed to OnDraw. Instead of using pDrawItemStruct coordinates you will
need to compute the rectangle yourself, using GetClientRect and then
computing the image location so it is centered.

"97612" <> wrote in message

Thanks for everyone gives the suggestions.

I'm only want to show the thumbnail image, and there is no other needs.

My working now is let the OnUpdate()(other view will call the DOC's
UpdateAllViews() ) in the view(for show the thumbnail image) calling the
OnDraw() and draw the image.

First problem is that I don't know this is the correct way of doing so.

Sencond problem is that I can't draw the thumbnail image by imitating
other's source code("ImageTool" from code project) from the Internet. The
source code is as following:

//************ code ******************
The project include a memdc.h which the author writes himself.

void CPreviewDlg::OnDrawItem( int nIDCtl, LPDRAWITEMSTRUCT
lpDrawItemStruct )
if( lpDrawItemStruct->itemAction & ODA_DRAWENTIRE )
CMemDC *pMemDC = NULL;
pMemDC = new CMemDC( lpDrawItemStruct->hDC );
lpDrawItemStruct->hDC = pMemDC->m_hDC;

CRect rect; GetClientRect( rect );
HBRUSH hBrush = ::CreateSolidBrush( RGB(255, 255, 255) );

::FillRect( lpDrawItemStruct->hDC, rect, hBrush );

DeleteObject( hBrush );
CImageToolDoc *pDoc = (CImageToolDoc*)

if( pDoc->m_pSelectedImage != NULL )
Graphics graphics( lpDrawItemStruct->hDC );
graphics.DrawImage( pDoc->m_pSelectedImage,
                 Rect( lpDrawItemStruct->rcItem.left,
   lpDrawItemStruct->rcItem.right - lpDrawItemStruct->rcItem.left,
   lpDrawItemStruct->rcItem.bottom - lpDrawItemStruct->;

delete pMemDC;
//************ code ******************
The problem is that there's no "int nIDCtl" and "LPDRAWITEMSTRUCT
lpDrawItemStruct" parameter for OnDraw()!!!

"Tom Serface" wrote:

The only argument for using a form view is if there would ever be a
of needing more controls added. Resizing a picture control in a formview
easy and looks about the same as the solution you are demonstrating. If
is sure they will never need any other controls (like description info,
info, ability to select image, etc.) then this method is likely easier to
implement (although not a lot easier).


"AliR (VC++ MVP)" <AliR@online.nospam> wrote in message

I disagree with doing it this way. If he is only going to display an
on a window why go through the overhead of CFormView and a CStatic. Why
not simply draw the image himself in the views paint routine. This way
has full control, if later he wants to add scrolling he can do that
if he had a CFormView with a static control it would be difficult), and
also can avoid flickering by overriding the erasebackground message.

void CMyView::OnPaint()
       CPaintDC dc(this);
       CMemDC MemDC;
       int Saved = MemDC.SaveDC();
       //calculate X, and Y based on the window size and Width and
of bitmap


Scott McPhillips [VC++ MVP]

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