Listview selections

[Jim Seekamp]

I'm trying to change a view window everytime a listview changes selections. I noticed there is no equivalent to "lbn_selchange", so I'm just trying t trap every event that would move the highlight bar in the listview:

       case %wm_notify

         dim nmhp as nmhdr ptr
         dim lpnmk as nmkey ptr


         select case lowrd(wparam&)
           case 101  ''listview
             nmhp=lparam&

             select case @nmhp.code
               case %lvn_columnclick
                 ''column header click
               case %nm_dblclk
                 ''double click
                 postmessage hwnd&,%wm_command,%idok,0
               case %nm_click
                 gosub switchasbpics
               case %nm_keydown
                 lpnmk=lparam&

                 select case @lpnmk.nvkey
                   case %vk_up,%vk_down,%vk_prior,%vk_next,%vk_home, _
                        %vk_end
                     gosub switchasbpics
                 end select

             end select

         end select

This is working for clicks on the listview, but not on the up/down/pageup/pagedown/home/end keys when they are pressed!
Any ideas??

[Ian Cairns]

%LVN_ITEMCHANGED ?

regards, Ian

[Jim Seekamp]

LOL
OK - now I feel like an IDIOT!!

(why didn't I find that one???)

Thanks Ian.
Case closed.

[Michael Mattias]

Remember, you do not have to "do your thing" every time you get a WM_NOTIFY/LVN_ITEMCHANGED notification; you can isolate changes to the selected state....

'Listview Handler UDT
UNION LvUnion
   NMHDR  AS NMHDR
   NMLV   AS NMLISTVIEW
   NMIA   AS NMITEMACTIVATE
   LVDI   AS LV_DISPINFO
   LVCD   AS NMLVCUSTOMDRAW
   NMTTDI AS NMTTDISPINFO
END UNION


     CASE %WM_NOTIFY
                ' Always use idFrom not LOWRD(wparam)
                 plvu = lparam
                ' Ctl = @plVU.nmhdr.idfrom
                 SELECT CASE AS LONG @plvu.nmhdr.idfrom
                   CASE %IDPM_LV
                        SELECT CASE AS LONG @plVU.nmhdr.code

                           CASE %LVN_ITEMCHANGED
                                   IF ISTRUE (@plvu.NMLV.uCHANGED AND %LVIS_SELECTED) THEN 

                                        The selected state of the item has changed.. it may be 
                                        now selected or now not selected, but it has changed
                                 
                                  IF ISTRUE (@plvu.NMLV.uNewState AND %LVIS_SELECTED) THEN
                                       The item's state is selected 
                                  ELSE
                                       the item's state is NOT selected
                                  ........

MCM

[Michael Mattias]

This is working for clicks on the listview, but not on the up/down/pageup/pagedown/home/end keys when they are pressed!
Any ideas??

FWIW, I know I handled those keys in a listview in this demo:

Simple Report Viewer Using Listview Control November 23, 2002; updated 5/30/05 to 'greenbar' file viewer

UPDATE

I just looked at that, and it was yet another post of mine which got cheesed up during the forum software conversion. YECHH!

So... I reposted the code as a reply (at post #5). I sent a note to the webmaster to remove the "code" (if you want to call it that) from post #2, so hopefully that will be gone at some near point in the future.


MCM