Re: CListCtrl size at runtime

I think, with a listbox, you can do something a simple as:

  // Set the horizontal scroll width
  int oldwidth = m_ListBox.GetHorizontalExtent();
  CDC* pDC = m_ListBox.GetWindowDC();
  if (pDC) {
       int newwidth = pDC->GetTextExtent(msg, _tcslen(msg)).cx;
       m_ListBox.ReleaseDC(pDC);
       if (newwidth > oldwidth)
            m_ListBox.SetHorizontalExtent(newwidth);
  }
   // Delete old entries
   if (m_ListBox.GetCount() >= 300)
        m_ListBox.DeleteString(0);
    // Add the new string at the end
    m_ListBox.AddString(msg);
 }

You could do the same thing with a list control using:

if(m_ListCtrl.GetItemCount() == MAX_ITEMS)
    m_ListCtrl.DeleteItem(0);
m_ListCtrl.AddItem(...);

Of course if it's a virtual list control you would simply delete the content
from your external source and leave the number of items in the list constant
(I.E., remove one and add one to external content so list ctrl stays the
same size). So with something like a CObArray you could do:

if(m_MyArray.GetCount() == MAX_ITEMS)
    delete m_MyArray.GetAt(0); // Delete data that was stored in the array
    m_MyArray.RemoveAt(0); // Remove 1st item
    m_MyArray.Add(pNewInfo); // Add the new one at the end
    m_ListCtrl.UpdateWindow();
}
else {
     m_MyArray.Add(pNewInfo); // Add the new item
     m_ListCtrl.SetItemCountEx(m_MyArray.GetCount()); // Let it grow until
we get to MAX_ITEMS
}

The list control would never know any difference. Who said MFC is
difficult. It's easy breezy... flexible and fast :o)

Tom

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