Selecting and deselecting a range of rows


The list box control class has a selection function SelItemRange(). This function, though missing in the CListCtrl class, is easily implemented.
// SelItemRange - Selects/Deselect a range of items
// Returns              - The number of new items selected
// bSelect              - TRUE to select, FALSE to deselect
// nFirstItem           - index of first item to select
// nLastItem            - index of last item to select
int CMyListCtrl::SelItemRange(BOOL bSelect, int nFirstItem, int nLastItem)
{
        // make sure nFirstItem and nLastItem are valid
        if( nFirstItem >= GetItemCount() || nLastItem >= GetItemCount() )
                return 0;

        int nItemsSelected = 0;
        int nFlags = bSelect ? 0 : LVNI_SELECTED;
        int nItem = nFirstItem - 1;
        while( (nItem = GetNextItem( nItem, nFlags )) >=0
                        && nItem <= nLastItem )
        {
                nItemsSelected++;
                SetItemState(nItem, bSelect ? LVIS_SELECTED : 0, LVIS_SELECTED );
        }
        return nItemsSelected;
}



Comments

  • Selecting all items quickly

    Posted by Legacy on 05/13/1999 12:00am

    Originally posted by: Phil Hall

    This will select all items the quickest way possible:
    
    


    void CMyListCtrl::SelectAllItems()
    {
    LV_ITEM theItem;

    theItem.mask = LVIF_STATE;
    theItem.iItem = -1;
    theItem.iSubItem = 0;
    theItem.state = LVIS_SELECTED;
    theItem.stateMask = 2;

    this->SetItemState(-1, &theItem);

    return;
    }

    Reply
  • Selecting multiple rows in a List control

    Posted by Legacy on 02/05/1999 12:00am

    Originally posted by: Kammie Dill

    I have a list control with over 100,000 items in it. I would like for the user of the app to be able to select all the items at once. I have provided a button on the toolbar for this, but the only way I know how to select all of the items is by looping through all 100,000 and setting the "select" state. This takes a long time and the screen flashes until all are selected. Is there a better way to do this?

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  • Your email address will not be published.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

Top White Papers and Webcasts

  • Today's agile organizations pose operations teams with a tremendous challenge: to deploy new releases to production immediately after development and testing is completed. To ensure that applications are deployed successfully, an automatic and transparent process is required. We refer to this process as Zero Touch Deployment™. This white paper reviews two approaches to Zero Touch Deployment--a script-based solution and a release automation platform. The article discusses how each can solve the key …

  • On-demand Event Event Date: December 18, 2014 The Internet of Things (IoT) incorporates physical devices into business processes using predictive analytics. While it relies heavily on existing Internet technologies, it differs by including physical devices, specialized protocols, physical analytics, and a unique partner network. To capture the real business value of IoT, the industry must move beyond customized projects to general patterns and platforms. Check out this webcast and join industry experts as …

Most Popular Programming Stories

More for Developers

RSS Feeds