OpenEuphoria

RE: Treeview Rant !

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

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.