CListCtrl - clearing all selections

bstadnyk@creo.bc.ca
Wednesday, July 03, 1996

     Environment: 
     NT 3.51, MSVC 4.0
     
     Problem: 
     I need to programmatically clear all selections in the CListCtrl.
     
     Why I am doing this:
     I'm trying to write a "file open" and "file save" dialogs similar to 
     windows's.  But instead of a list box displaying items to select, I am 
     using a CListCtrl to display additional item information and allow 
     sorting by columns, sizing columns, etc. But I only want the item in 
     the CListCtrl to be focused on, not selected (i.e. see notepad's file 
     save and file open). That item's "name" is then copied to the 
     Open/Save name edit box (i.e. see how notepad's open/save works).
     
     Design constraints:
     I am creating a derived CListCtrl to encapsulate these enhancement and 
     add the owner draw "full item line" selection (as shown in the MSVC4.1 
     MFC sample ROWLIST). I need to actually clear the selection in the 
     CListCtrl, not just "turn off" the highlighting. I understand how 
     LVS_SHOWSELALWAYS works.
     
     What I have tried:
     1) Scanning through the CListCtrl for selected items and removing the 
     LVNI_SELECTED state.  Did not work.
     2) As the item is being changed, remove its LVNI_SELECTED state. Did 
     not work (remained selected), and I don't like this solution.
     3) After the item is changed, remove its LVNI_SELECTED state. Did not 
     work (remained selected), and I'm not surprised. Again I don't like 
     this solution.
     4) Checked MSDN.
     5) Checked the mfc-l website.
     6) Checked the MFC FAQ.
     
     So can this be done?  If so, has anyone successfully done it?
     
     Thanks in advance,
     
     Bruce Stadnyk
     Creo Products Inc.
     Burnaby, B.C.
     Canada
     
     bstadnyk@creo.bc.ca

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David.Lowndes@bj.co.uk
Monday, July 08, 1996

[Mini-digest: 2 responses]

>     Problem: 
>     I need to programmatically clear all selections in the CListCtrl.
>     
>     LVS_SHOWSELALWAYS works.
>     
>     What I have tried:
>     1) Scanning through the CListCtrl for selected items and removing the 
>     LVNI_SELECTED state.  Did not work.
>     2) As the item is being changed, remove its LVNI_SELECTED state. Did 
>     not work (remained selected), and I don't like this solution.
>     3) After the item is changed, remove its LVNI_SELECTED state. Did not 
>     work (remained selected), and I'm not surprised. Again I don't like 
>     this solution.
>     
>     So can this be done?  If so, has anyone successfully done it?

Bruce,

As nothing you have tried with this problem has worked, could you post a
snippet of your code, perhaps there's something missing.

Dave Lowndes
-----From: "Kalon R. Kelley" 

It seems to me that a variant on your 2nd try is the most appropriate
solution.  I assume that you created a handler for the LVN_ITEMCHANGING
notification.  Instead of trying to remove the LVNI_SELECTED state during
the change operation, why not simply deny the change (by returning a TRUE
result value) if the state is changing to selected?

Cheers,
Kalon.

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