OpenEuphoria

RE: Treeview Rant !

• Posted by Derek Parnell <ddparnell at bigpond.com> Apr 24, 2002
• 328 views

euman at bellsouth.net wrote:
> Thanks Derek either I dont understand your responce or
> you misinterpreted mine.
> 
> 25 is never a returned value in vKey = peek(lParam + 12)
> 
> If I hold down the shift + tab keys at the same time only
> the tab key or '9' is returned.
> 
> I might need to use HKM_SETHOTKEY as a work around
> 

My fault. I guess I totally misunderstood your problem.

When you wrote "works really good" I assumed that the code example was 
working to your satisfaction and that you were asking a hypothetical 
question.

Anyhow, if the TreeView notifications don't give you the state of the 
shift keys, you might have to consider calling either "GetAsyncKeyState" 
or "GetKeyState" , or maybe even "GetLastInputInfo" to find out if the 
shift key(s) are down or up.
----
Derek.

> ----- Original Message ----- 
> From: "Derek Parnell" <ddparnell at bigpond.com>
> To: "EUforum" <EUforum at topica.com>
> Sent: Wednesday, April 24, 2002 1:59 AM
> Subject: RE: Treeview Rant !
> 
> 
> > euman at bellsouth.net wrote:
> > > Hello all,
> > > 
> > > I found what I consider to be a bug in the Treeview control
> > > 
> > > consider this bit of code. ->
> > > 
> > > elsif iMsg = TVN_KEYDOWN then
> > >        vKey = peek(lParam + 12) --struct tagTVKEYDOWN (WORD wVKey)
> > >        if vKey = 9 then                                  
> > >           SetFocus(futurecontrol) 
> > >        elsif vKey = 25 then  -- should be shift+tab    
> > >           SetFocus(previouscontrol)                             
> > >        end if
> > > end if
> > > 
> > > works really good but what if someone wanted to reverse the taborder 
> > > direction
> > > for focus purposes? 
> > > 
> > > shift+tab "or"  shift = 16 + tab = 9  should be vKey = 25
> > > but this control doesnt handle this in the right way thus returning vKey 
> > > 
> > > = 9
> > > 
> > > you cant go backward from a Treeview control, unless someone can provide 
> > > 
> > > a
> > > work around...
> > > 
> > 
> > This one way you might like to try:
> >  
> >   if StandardTabbing then
> >       ForwardTab = 9
> >       BackwardTab = 25
> >   else
> >       ForwardTab = 25
> >       BackwardTab = 9
> >   end if
> > 
> >  . . . 
> > 
> >  elsif iMsg = TVN_KEYDOWN then
> >         vKey = peek(lParam + 12) --struct tagTVKEYDOWN (WORD wVKey)
> >         if vKey = ForwardTab then                                  
> >            SetFocus(futurecontrol) 
> >         elsif vKey = BackwardTab then  -- should be shift+tab    
> >            SetFocus(previouscontrol)                             
> >         end if
> >  end if
> > 
> > -------------
> > This hightlights the problems of too much hard-coding.
> > 
> > -----
> > Derek.
> 
>