vert_border_lines2.shtml

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   <META NAME="Author" CONTENT="Shilpa Shamapant">
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   <TITLE>Fix resizing problem on vertical line for column borders</TITLE>
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<H3>
<FONT COLOR="#AOAO99">Fix resizing problem on vertical column borders</FONT></H3></CENTER>

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This code was contributed by <A HREF="mailto:Serge.Wautier@technotrade.be">Serge Wautier</A>.
This code is based on the article "Vertical lines for Column Borders" so read that 
article for more information.
In the previous code everything's fine as long as the visible part of the list is full 
the items are displayed up to the bottom of the control's window.If the list is not full,
there is a problem when you resize a column header to make it wider. The original line is
not erased in the empty part of the list. So we get an  unwanted bar-code like pattern.

<PRE><TT><FONT COLOR="#990000">
Override CListCtrl::OnNotify as follows :

BOOL CMyListCtrl::OnNotify(WPARAM wParam, LPARAM lParam, LRESULT*pResult) 
{
  HD_NOTIFY *pHD = (HD_NOTIFY*)lParam;

  if ((pHD->hdr.code == HDN_ITEMCHANGINGA || pHD->hdr.code == HDN_ITEMCHANGINGW) && (GetStyle() & LVS_TYPEMASK) == LVS_REPORT)
  { // Invalidate empty bottom part of control to force erase the previous position of column
    int nBottom,nLastItem=GetItemCount()-1;
    if (nLastItem<0)
      nBottom=0; // List is empty : invalidate whole client rect
    else
    { // Get Y position of bottom of list (last item)
      RECT ItemRect;
      GetItemRect(nLastItem,&ItemRect,LVIR_BOUNDS);
      nBottom=ItemRect.bottom;
    }
    
    RECT rect;
    GetClientRect(&rect);
    if (nBottom&lt;rect.bottom)
    { // Set top of rect as bottom of list (last item) : rect = empty part of list
      rect.top=nBottom;
      InvalidateRect(&rect);
    }

    // NB: We must to on with default processing.
  }

  *pResult = 0;
  return CListCtrl::OnNotify(wParam, lParam, pResult);
}

Simply adding a HDN_ITEMCHANGING or HDN_TRACK handler with
ClassWizarddoesn't work. These handlers are not called. Why ???
I noticed that class wizard places an ON_NOTIFY_REFLECT(...) entry for
these notifications. I'd rather put an ON_NOTIFY(...) since the
notification comes from the header control to its parent (the listctrl).
But Spy++ shows that the CtrlID of the header is 0. repplacing the
ON_NOTIFY_REFLECT entry by ON_NOTIFY(HDN_xxx,0,f) didn't solve the
problem. That's why I chose to override OnNotify()
</FONT></TT></PRE>


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