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CListBox::SetAnchorIndex

Visual Studio 2010

Sets the anchor in a multiple-selection list box to begin an extended selection.

Copy 
void SetAnchorIndex(
   int nIndex 
);
nIndex

Specifies the zero-based index of the list-box item that will be the anchor.

In a multiple-selection list box, the anchor item is the first or last item in a block of contiguous selected items.

C++
Copy 

void CMyODListBox::OnLButtonDown(UINT nFlags, CPoint point)
{
   BOOL bOutside = TRUE;
   UINT uItem = ItemFromPoint(point, bOutside);

   if (!bOutside)
   {
      // Set the anchor to be the middle item.
      SetAnchorIndex(uItem);
      ASSERT((UINT)GetAnchorIndex() == uItem);
   }

   CListBox::OnLButtonDown(nFlags, point);
}

Header: afxwin.h

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