MFC limit selected item in ClistCtrl - c++

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

You would have to handle the LVN_ODSTATECHANGED notification message and count the number of selected item each time the LVIS_SELECTED state changes
Thanks

Answer 2

So I wrote this code. It should work. Just create an event handler for the list
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 is my control variable for the CListCtrl

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.