Re: CListCtrl, hide and edit

I typically sort the items in my memory list (the one the list control is
calling on to get it's value line by line). Of course the memory list can
be just about anything, but for me it's typically a vector of CObList of
objects so sorting is usually based off of one of the items in the object.
For example, I typically have a list of items that I just call a routine on
like:

bool CDialogWithList::CompareAndSwapString1(int pos, bool bAscending)
{
    CMyObjectInfo *temp;
    int posFirst = pos;
    int posNext = pos + 1;

    if(!bAscending) {
         if (((CMyObjectInfo *)GetAt(posFirst))->m_csString1 <
              ((CMyObjectInfo *)GetAt(posNext))->m_csString1) {
              temp = (CMyObjectInfo *)GetAt(posFirst);
              SetAt(posFirst, GetAt(posNext));
              SetAt(posNext, temp);
              return TRUE;
        }
   }
   else if (((CMyObjectInfo *)GetAt(posFirst))->m_csString1 >
         ((CMyObjectInfo *)GetAt(posNext))->m_csString1) {
         temp = (CMyObjectInfo *)GetAt(posFirst);
         SetAt(posFirst, GetAt(posNext));
         SetAt(posNext, temp);
         return TRUE;
    }
    return FALSE;
}

bool CDataFileArray::CompareAndSwapDate(int pos, bool bAscending)
{
   CMyObjectInfo *temp;
   int posFirst = pos;
   int posNext = pos + 1;
   if(!bAscending) {
       if (((CMyObjectInfo *)GetAt(posFirst))->m_cDate <
           ((CMyObjectInfo *)GetAt(posNext))->m_cDate) {
           temp = (CMyObjectInfo *)GetAt(posFirst);
           SetAt(posFirst, GetAt(posNext));
           SetAt(posNext, temp);
           return TRUE;
       }
   }
   else if (((CMyObjectInfo *)GetAt(posFirst))->m_cDate >
       ((CMyObjectInfo *)GetAt(posNext))->m_cDate) {
           temp = (CMyObjectInfo *)GetAt(posFirst);
           SetAt(posFirst, GetAt(posNext));
           SetAt(posNext, temp);
           return TRUE;
   }
   return FALSE;
}

Then I call a routine to Sort the object list like:

void CMyDialogWithList::Sort(MY_DATA_SORT_ITEMS nSort, bool bAscending)
{
    bool bNotDone = TRUE;
    int pos = 0;

    while (bNotDone) {
         bNotDone = FALSE;
         switch(nSort) {
         case MY_DATA_SORT_NONE:
              break;
         case MY_DATA_SORT_STRING1:
              for(pos = 0;pos < GetUpperBound();pos++)
                   bNotDone |= CompareAndSwapString1(pos, bAscending);
              break;
         case MY_DATA_SORT_STRING2:
              for(pos = 0;pos < GetUpperBound();pos++)
                   bNotDone |= CompareAndSwapString2(pos, bAscending);
              break;
         case MY_DATA_SORT_DATE:
             for(pos = 0;pos < GetUpperBound();pos++)
                   bNotDone |= CompareAndSwapDate(pos, bAscending);
             break;
         default:
              break;
         };
    }
}

So I don't use the sort mechanism in the list control at all. When the
column wants to sort I just sort the list then refresh the current screen
and only the items on the screen are drawn. I also move it back to the
top of the list when someone sorts one of the columns. I think is sort of
expected behavior. This is may not be the most efficient method for doing
sorting, but it works well and keeps the object list in an order that I
can write out and read back in the same order as the user last sorted.

Also, you can edit sub-items, but you have create your own edit control or
trick it into think it is colums 0. For example:

http://www.codeguru.com/cpp/controls/listview/editingitemsandsubitem/article.php/c4175/

It's not that difficult once you get it implemented.

Tom

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