1. 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.
2. RE: Treeview Rant !
> -----Original Message-----
> From: euman at bellsouth.net [mailto:euman at bellsouth.net]
> 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
This doesn't seem right. I wouldn't think you'd 'or' the two keys together.
Otherwise, there'd be no way to differentiate between shift + a and r:
VK_TAB 09h
VK_SHIFT 10h
VK_A 41h
VK_R 52h
Have you tried looking for VK_SHIFT, and then VK_TAB? There doesn't seem to
be a TVN_KEYUP, so I'm not sure how you could discriminate, unless you
figure out who gets the WM_KEY or NM_KEYDOWN notification for the treeview.
For some reason, the TVN_KEYUP doesn't pass the shift flags.
Matt Lewis
3. RE: Treeview Rant !
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.
>
>
