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Automatically resorting after an edit

Thursday Aug 6th 1998 by Zafir Anjum

Automatically resorting after an edit


The only time the list view control does some sorting is when inserting an item into the list. Then too, the control should have the LVS_SORTASCENDING  or the LVS_SORTDESCENDING  style. The new item is inserted in its proper place and the other items remain in the same relative order. If the user edits an item, the list view has to be explicitly sorted to maintain the order. To achieve this, the resort code has to be initiated from the LVN_ENDLABELEDIT handler. The code below uses the SortTextItems() function covered in a previous section. If the sorting is based on anything other that the text, then the SortItems() function should be used for sorting.
 
void CMyListCtrl::OnEndLabelEdit(NMHDR* pNMHDR, LRESULT* pResult)
{
        LV_DISPINFO  *plvDispInfo = (LV_DISPINFO *)pNMHDR;
        LV_ITEM          *plvItem = &plvDispInfo->item;


        if (plvItem->pszText != NULL)
        {
                SetItemText(plvItem->iItem, plvItem->iSubItem, plvItem->pszText);
                SortTextItems( 0, TRUE );
        }
        *pResult = FALSE;
}
There are two things that should be noted. First, the item is updated using SetItemText() before calling the sorting function. If this were not done, the sorting routing see only the old data. Second, we set *pResult to FALSE. This is important. Setting a TRUE value tell Windows that the editing change should be accepted, but the row that was edited is now probably occupied by another row and it is this row that will get updated.
 

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