Navigating trough List View

[ionutdinulescu]

I have a CListCtrl control and a text box on a dialog. When I click on an item in the list, I display a corresponding message in the text box.
Now I would like to do the same when I press arrow and page down/up keys.

I'm currently using LVN_KEYDOWN message. The problem is that when I go from item no 0 to item no 1, the selected index change is not seen by the LVN_KEYDOWN (so in the message handler, the selected item will be 0 instead of 1). Another problem is that LVN_KEYDOWN message doesn't tell me what key I have pressed.

Do you guys know a workaround for this ?

 

[cdraycott]

ionutdinulescu,

You need to use LVN_ITEMCHANGED message. Goto classwizard and add a function for the CListCtrl for that message. Then in the function put the following:

void CTest1Dlg::OnItemchangedList1(NMHDR* pNMHDR, LRESULT* pResult)
{
NM_LISTVIEW* pNMListView = (NM_LISTVIEW*)pNMHDR;

m_szEdit = m_lstList.GetItemText(pNMListView->iItem,pNMListView->iSubItem);

UpdateData(FALSE);

*pResult = 0;
}

Where CTest1Dlg is my dialog class and m_szEdit is the CString variable associated with my edit control on the dialog. m_lstList is the member variable associated with my CListCtrl.

 

[ionutdinulescu]

Seems to work, but if I put a breakpoint in this function, then move from item 2 to item 0, it gets to the breakpoint 3 times. First 2 times pNMListView->iItem is still 2, and it gets to 0 the third time.

I can do a workaround for this, but it's a bit stupid that it happens. It doesn't happen in VB/Delphi/Java.

 

[cdraycott]

ionutdinulescu,

All you need to do is put a check in for:

pNMListView->uNewState != 0

as this value is 0 unless there is a state change only 1 of the 3 times the message handler gets called will be the one you are interested in.

So for example the code would now be:

void CTest1Dlg::OnItemchangedList1(NMHDR* pNMHDR, LRESULT* pResult)
{
NM_LISTVIEW* pNMListView = (NM_LISTVIEW*)pNMHDR;

if (pNMListView->uNewState != 0)
{
m_szEdit = m_lstList.GetItemText(pNMListView->iItem,pNMListView->iSubItem);

UpdateData(FALSE);
}

*pResult = 0;
}