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
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