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.
 



Comments

  • There are no comments yet. Be the first to comment!

Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • Live Event Date: November 20, 2014 @ 2:00 p.m. ET / 11:00 a.m. PT Are you wanting to target two or more platforms such as iOS, Android, and/or Windows? You are not alone. 90% of enterprises today are targeting two or more platforms. Attend this eSeminar to discover how mobile app developers can rely on one IDE to create applications across platforms and approaches (web, native, and/or hybrid), saving time, money, and effort and introducing apps to market faster. You'll learn the trade-offs for gaining long …

  • Live Event Date: October 29, 2014 @ 11:00 a.m. ET / 8:00 a.m. PT Are you interested in building a cognitive application using the power of IBM Watson? Need a platform that provides speed and ease for rapidly deploying this application? Join Chris Madison, Watson Solution Architect, as he walks through the process of building a Watson powered application on IBM Bluemix. Chris will talk about the new Watson Services just released on IBM bluemix, but more importantly he will do a step by step cognitive …

Most Popular Programming Stories

More for Developers

Latest Developer Headlines

RSS Feeds