Question

Hi I use ClistCtrl that have 20 items and I want to limit selected item number. for example only 10 item can be selected. how i can do it? thanks for your help herzl.

Answer 1

您必须处理LVN_ODSTATECHANGED通知,并每当LVIS_S 选入国家修改时计算选定项目的数量

增编

Answer 2

因此,我写了这一法典。它应当发挥作用。仅为名单设立一个活动手

void CDatenbankView::OnLvnItemchangedList1(NMHDR *pNMHDR, LRESULT *pResult)
{
    int SelctedItems;
    SelctedItems = 0;
    int Index;

    LPNMLISTVIEW pNMLV = reinterpret_cast<LPNMLISTVIEW>(pNMHDR);

    for (Index = 0; Index < m_List.GetItemCount(); ) //Check every Item
    {
        if (m_List.GetItemState (Index, LVIS_SELECTED) == LVIS_SELECTED) //Checks if it is selected
        {
            if (SelctedItems > 10) 
            {
                MessageBox (_T("Cant select more than 10 Items"));
                for (Index = 0; Index < m_List.GetItemCount(); )
                {
                    m_List.SetItemState (Index, ~LVIS_SELECTED, LVIS_SELECTED);
                    Index++;
                }
                break;
            }
            else
            {
                SelctedItems++;
            }
        }
        Index++;
    }
    *pResult = 0;
}

m_List是我对CListCtrl的控制变量

Answer 3

There is no built-in functionality for such a feature. You d have to write your our code for that. Maybe you can find another way to do it, like having a source list and a "selection list". You copy/move items from the first to the second, but you do not allow the users to put more than 10 items into the destination list.

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