CListCtl - handling clicks and selection

Gerry Sweeney -- gerry@hornbill.com
Tuesday, May 21, 1996


Environment: NT3.51 SP3, MSVC20, MFC

Dear Listers,

I am in the process of porting some 16bit server code over to 32bit.

I have implemented a view which has a CListCtl in it. This list just 
displays a list of users currently connected to the server and has various 
bits of information like a username, ip address, socket no ect. In the 16 
bit code I had a menu option that allowed me to display communications 
statistics of the selected user. Using the CListCtl I have been unable to 
figure out weather or not an item is selected or what item is selected. I 
have created the control with the WS_VISIBLE | WS_CHILD | LVS_REPORT | 
LVS_SINGLESEL options. This only allows me to select one item at a time 
which is what I wanted. I have tried overriding the OnNotify member function 
of my view or get notifications from the control. This works but there does 
not seem to be the notifications I need. I have looked at the samples on the 
MSDN but have not found an answer.
    What I am trying to achieve is the equivalent functionality to the 
CListBox messages:-

ON_CLICK
ON_DBLCLICK
GetCurSel();

Any ideas, pointers to examples ect..

Kind Regards

Gerry Sweeney
gerry@hornbill.com

---

Terry Wellmann -- wellmatl@cs.purdue.edu
Monday, May 27, 1996

[Mini-digest: 6 responses]

Gerry,

Just a couple of ideas.  After reading your post here are a few ideas that
came to mind.  I'm not sure if they will work or how easily they can be
implemented but it may be worth looking into.  If it helps, forward the
result to the mailing list.  I'm not going to send it through there if I'm
way off track.

Try capture the messages: WM_LBUTTONDBLCLK, WM_LBUTTONDOWN.

You may need to subclass the CListCtrl and add these messages yourself.

The handlers for the messages above include the point of the mouse click.
If you call the member function HitTest() it should return the index number
of the item that was clicked on. From there you should be off and running.

Good luck.

Terry

-----From: Mario Contestabile

Eg1
void mlistview::OnLButtonDblClk(UINT nFlags, CPoint point) 
or
void mlistview::OnRButtonDown(UINT nFlags, CPoint point) 
then
LV_HITTESTINFO lvh; 
lvh.pt = point;
if(m_ListCtrl.HitTest(&lvh) == -1) return;
CString FileName = m_ListCtrl.GetItemText(lvh.iItem, 0); // get text from 
column 0

Eg2
case WM_NOTIFY:
 NMHDR* Head = (NMHDR*)lParam;
 if(head->code == NM_DBLCLICK)

mcontest@universal.com
  
-----From: "Tim Swetonic (Starwave)" 


This is what you need to use:

int nSelItem = CListCtrl::GetNextItem(-1, LVNI_SELECTED);

-----From: Ken Freeman 

Look at NM_CLICK, NM_DBLCLK, and CListCtrl::GetItem.

Ken
-----From: Niels Ull Jacobsen 

I think you'll have to trap the WM_NOTIFY yourself=20
in VC 2.0. The details should be in the SDK documentation.

>ON_DBLCLICK
ON_NOTIFY(NM_DBLCLK, ID_MYLIST, OnListNmClick)

>GetCurSel();

GetNextItem(-1, LVNI_SELECTED)


>
>Any ideas, pointers to examples ect..
>
>Kind Regards
>
>Gerry Sweeney
>gerry@hornbill.com
>
>
>
Niels Ull Jacobsen, Kr=FCger A/S (nuj@kruger.dk)
Everything stated herein is THE OFFICIAL POLICY of the entire Kruger grou=
p
and should be taken as legally binding in every respect. Pigs will grow
wings and fly.





-----From: "Frederic Steppe" 

You receive standard notification for click events : NM_CLICK, NM_DBLCLICK, 
NM_RCLICK
You get item change notification by trapping LVN_ITEMCHANGED (WM_NOTIFY)
You can figure out which item is selected by using MyList.GetNextItem(-1, 
LVNI_SELECTED)

I think the easiest way to work on that is to use the VC++ 4 and ClassWizard 
to get the notification (for example : create a form view with a list control 
in it, declare a CListCtrl member variable using ClassWizard and you'll have a 
quite complete list of notifications available).


Frederic Steppe (frederics@msn.com)

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