Re: CListCtrl derived class and disabling item selection

From:
"AliR \(VC++ MVP\)" <AliR@online.nospam>
Newsgroups:
microsoft.public.vc.mfc
Date:
Fri, 16 Feb 2007 15:44:31 GMT
Message-ID:
<zjkBh.19414$ji1.14980@newssvr12.news.prodigy.net>
Keep in mind that if you don't let it draw the focus rect around a disabled
item, and if the user is using the keyboard to move around, he will loose
track of where he is at.

AliR.

"German Koninin" <nomail@available.com> wrote in message
news:eVnNa$aUHHA.1200@TK2MSFTNGP04.phx.gbl...

I used
  SetItemState(pNMLV->iItem, 0, LVIS_SELECTED|LVIS_FOCUSED);
to completely remove selection.

Thank you all

"AliR (VC++ MVP)" <AliR@online.nospam> wrote in message
news:8Z%Ah.22307$zH1.304@newssvr29.news.prodigy.net...

Oh One more thing, when you are unselecting an item but you still want
the focus rect around the item then you might want to do this instead
if (....)

{

   //disable the item but still draw the focus rect

  SetItemState(pNMLV->iItem,LVIS_FOCUSED,LVIS_SELECTED|LVIS_FOCUSED);

}

AliR.

"AliR (VC++ MVP)" <AliR@online.nospam> wrote in message
news:uT%Ah.22303$zH1.16901@newssvr29.news.prodigy.net...

Here is how I would do it. I would catch the LVN_ITEMCHANGED message
for the list ctrl and check to see if the item is being selected. If it
is and it is disabled then I would simply unselected it.

//every other item is disabled!
BOOL CMyListCtrl::IsItemDisabled(UINT ItemID)
{
  return ItemID % 2 != 0;
}

void CMyListCtrl::OnLvnItemchanged(NMHDR *pNMHDR, LRESULT *pResult)
{
  LPNMLISTVIEW pNMLV = reinterpret_cast<LPNMLISTVIEW>(pNMHDR);
   //if item is being selected and is diabled
  if (IsItemDisabled(pNMLV->iItem) && (pNMLV->uNewState & LVIS_SELECTED)
== LVIS_SELECTED)
  {
       //unselect it!
     SetItemState(pNMLV->iItem,0,LVIS_SELECTED);
  }
  *pResult = 0;
}

AliR.

"German Koninin" <nomail@available.com> wrote in message
news:eoMskzQUHHA.4872@TK2MSFTNGP03.phx.gbl...

Hello everybody.
I have a CListCtrl derived class wich is also owner draw. Now I need to
disable selecting items. So user should be able to see the list and be
able to scroll it and everything. But selecting items should be
disabled. I wrote a handle for OnLButtonDown which give me an
opportunity to handle mouse button clicking and so user can't select
the item by mouse. But it is still possible by arrows. I tried to
handle VKeyToItem but it aseems never get called. So in my case how can
I disable selecting items by arrows also. Or is there any better way to
do that all together?
PS: I was looking for some properties for a CListCtrl but didn't find
anything useful.
Thanks

German Koninin

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