Re: Mouse movement within CStatic/Picture box

From:
 geeta.mudaliyar@gmail.com
Newsgroups:
microsoft.public.vc.mfc
Date:
Sat, 30 Jun 2007 00:26:47 -0700
Message-ID:
<1183188407.226083.160290@o11g2000prd.googlegroups.com>
On Jun 14, 1:45 am, MD <madhu.da...@gmail.com> wrote:

On Jun 13, 6:37 am, "Scott McPhillips [MVP]" <org-dot-mvps-at-

scottmcp> wrote:

MD wrote:

Thanks Scott, Tom , Alir, Arman:

Like I told I am just a beginner inMFCprogramming. I started on a
wrong foot with handling ON_STN_CLICKED. Thats the event for clicking
on Static controls within a dialog.

But I was able to work this out using Alir's method.Now I am able to
draw a rectangle on picture box using the following code, now the
problem is as I move themousethere will be a track of rectangles
over the picture box, I was wondering if you guys can suggest a method
where I can refresh the picture box or reset the previous rectangle,
so that as I drag only one final rectangle remains .

void CPictureBox::OnPaint()
{
   CPaintDC pDC(this); // device context for painting

   RECT rect;
   GetClientRect(&rect);
   if(m_Tracking==TRUE)
   {
           pDC.SelectStockObject(HOLLOW_BRUSH);
           pDC.Rectangle(m_Rect); //rectangle
coordinates captured in mousedown/up and move events

   }
   else
           if(m_sBitmap!="")
                   ShowBitmap(&pDC);
}

Thanks for the help,


OnPaint must paint the entire picture box, not just add to it. The
reason is that the image on a window can be destroyed by other popup
windows, and Windows calls OnPaint when you need to fix it. So you
should make it always paint the bitmap and then optionally add the
tracking rect. In fact, if you don't currently have a bitmap you should
draw a blank background rect to "fix" an empty box. Otherwise an image
of the other popup window will remain.

By the way, if(m_Tracking==TRUE) is very poor style and error-prone: Use

if (m_Tracking)
...

--
Scott McPhillips [MVP VC++]


Thanks Scott,

I understood what you were trying to say, and I fixed it. I have it
working now.

-MD- Hide quoted text -

- Show quoted text -


I am also trying to do the same activity. problem here is though i
have mapped the CStatic - dervied class LButtonDown(), MouseMove() and
LButtonUp(), my dlgbox does not process these functions on event
occurance.

the test code is as follows:-

void CDrawingStatic::OnLButtonDown(UINT nFlags, CPoint point)
{
    // TODO: Add your message handler code here and/or call default
    AfxMessageBox("Hi Btn Down");
    CStatic::OnLButtonDown(nFlags, point);
}

void CDrawingStatic::OnLButtonUp(UINT nFlags, CPoint point)
{
    // TODO: Add your message handler code here and/or call default
    AfxMessageBox("Hi Btn Up");
    CStatic::OnLButtonUp(nFlags, point);
}

void CDrawingStatic::OnMouseMove(UINT nFlags, CPoint point)
{
    // TODO: Add your message handler code here and/or call default
    AfxMessageBox("Hi MouseMv");
    CStatic::OnMouseMove(nFlags, point);
}

please guide me what's wrong here?

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