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Sort buttons - like the newsgroups?

Date: 11/30/99
Time: 12:17:34 AM
Q. Hi, using Bc5 for windows programming using OWL. Does anybody know how to create the 'sort' buttons eg the 'From' 'Sent' buttons on the newsgroup
software which sort a list in ascending or descending order alphabetically or numerically ??

A.Use the TListWindow control in report mode (LVS_REPORT). Add TColumnHeaders to the list window as shown in bc5\examples\owl\classes\listwind. Capture the button click event in the window that owns the list window by adding

    EV_LVN_COLUMNCLICK(IDC_LINESVIEW, LVNColumnclick),

    to its response table. (here, IDC_LINESVIEW is the ID of the list window and LVNColumnclick is the function that responds to the event). OWL passes
a TLwNotify object to the event handler. the TLwNotify::iSubItem tells you which (0-based) column header was clicked. My response function looks
like:

void TEditLinesDialog::LVNColumnclick(TLwNotify& lwn)
{
    switch ( lwn.iSubItem ) {
        default :
        case 0 :
            ToggleLegend();
            break;
        case 1 :
            ChooseColor();
            break;
        case 2 :
            ChooseStyle();
            break;
         case 3 :
            SetThickness();
            break;
    }
}

Obviously, I perform different functions depending upon which column header is clicked. You probably just want to sort the data in a particular column.

Regards,
Scott

Last changed: July 14, 2001