got it working

From:

"Eric Margheim" <nospam***ericm@charter.net>

Newsgroups:

microsoft.public.vc.mfc

Date:

Tue, 29 Jul 2008 11:33:11 -0500

Message-ID:

<#kuHNjZ8IHA.4108@TK2MSFTNGP04.phx.gbl>

This is a multi-part message in MIME format.

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How can I intercept the right-click to make sure it's on a valid row =

before

the selection event occurs?

I have a kludge that selects the row above after the fact but it's =

pretty

ugly. Optimally I'd like to prevent the row selection event from =

ever

occuring.

You might be able to handle this in WM_RBUTTONDOWN or =

LVN_ITEMCHANGING.

Here's what I did. It works like a charm. The OnNmRclick function does =
not get called unless I make the call to the base class OnRButtonDown =
function. I only do this if a valid ItemData pointer is found. =
Thanks for helping me think this through.

 void CDeleteBtnListCtrl::OnRButtonDown(UINT nFlags, CPoint point)
 {
 if (m_bOnlyAllowRClickSelectIfItemDataExists)
 {
 LVHITTESTINFO lvhti;
 lvhti.pt = point;
 int iItemSelected = SubItemHitTest(&lvhti);

 if (iItemSelected >= 0)
 {
 if (GetItemData(iItemSelected) == NULL)
 {
 return;
 }
 }
 }

 CListCtrl::OnRButtonDown(nFlags, point);
 }
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; =
charset=iso-8859-1">
<META content="MSHTML 6.00.6000.16674" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY>
<DIV>> >>How can I intercept the =
right-click
to make sure it's on a valid row before >>the selection event
occurs? >> >>I have a kludge that selects the row =
above after
the fact but it's pretty >>ugly.   Optimally I'd =
like to
prevent the row selection event from ever >>occuring. > =
 >
You might be able to handle this in WM_RBUTTONDOWN or =
LVN_ITEMCHANGING. >
 > -- </DIV>
<DIV>Here's what I did.  It works like =
a
charm.  The OnNmRclick function does not get called unless I make =
the call
to the base class OnRButtonDown function.   I only do this if =
a valid
ItemData pointer is found.   Thanks for helping me think this
through.</DIV>
<DIV> </DIV>
<DL>
 <DT>void
 CDeleteBtnListCtrl::OnRButtonDown(UINT nFlags, CPoint point) =
</DT>
 <DT>{</DT>
 <DT>    if
 (m_bOnlyAllowRClickSelectIfItemDataExists)</DT>
 <DT>    =
{</DT>
 <DT>    =
   
 LVHITTESTINFO lvhti;</DT>
 <DT>    =
   
 lvhti.pt = point;</DT>
 <DT>    =
    int
 iItemSelected = SubItemHitTest(&lvhti);</DT>
 <DT> </DT>
 <DT>    =
    if
 (iItemSelected >= 0)</DT>
 <DT>        {</DT>
 <DT>    =
   
     if (GetItemData(iItemSelected) == =
NULL)</DT>
 <DT>    =
   
     {</DT>
 <DT>    =
   
         return;</DT>
 <DT>    =
   
     }</DT>
 <DT>    =
   
 }</DT>
 <DT>    =
}</DT>
 <DT> </DT>
 <DT>   
 CListCtrl::OnRButtonDown(nFlags, point);</DT>
 <DT>}</DT></DL></BODY></HTML>

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