OpenEuphoria

Re: [WIN] drop-down lists stay in same place when window moved

• Posted by Dan Moyer <DANIELMOYER at prodigy.net> Sep 26, 2001
• 387 views

David,

Thanks, I'll see if I can do anything with your suggestion. Yeah, "glued" in
place isn't what anyone would tend to expect!

Dan


----- Original Message -----
From: "David Cuny" <dcuny at LANSET.COM>
To: "EUforum" <EUforum at topica.com>
Subject: Re: [WIN] drop-down lists stay in same place when window moved


>
> Dan Moyer wrote:
>
> > In my "Templates Handler", any drop-down list that
> > is "open" (dropped down) neglects to move with the
> > window if it's moved or resized.  Can anyone tell
> > me how to make an open dropped down list move with
> > the window?
>
> This was a bug for a long time in Win32Lib. I finally got around to fixing
> it, but I don't see it in the latest release of Win32Lib. Perhaps I never
> released the code, or something. I can't vouch that it will work in the
> current version of Win32Lib - there have been so many changes, I don't
> really know the all the ins and outs of the code anymore.
>
> First, I created a variable to hold the ID of the currently open dropdown,
> if any:
>
>    -- constants
>    constant
>        WM_WINDOWPOSCHANGING    = 70,
>        CB_SHOWDROPDOWN         = 335
>
>    integer
>        theDropList
>        theDropList = 0
>
> (You can tell the code is old, since the two constants weren't defined!)
>
> When a combo is opened (CBN_DROPDOWN), set openComboId to the open combo.
> When the combo closes (CBN_CLOSEUP), set openComboId to zero. This code
> lived in WndProc:
>
>      -- dropdown opened?
>      elsif event = CBN_DROPDOWN then
>          -- save droplist id
>          theDropList = myControl
>
>       -- dropdown closed?
>      elsif iMsg = CBN_CLOSEUP then
>          -- clear droplist
>          theDropList = 0
>
>      end if
>
> On a window resize/moving event, check if openComboId is nonzero. If it
is,
> a close combobox event (CB_SHOWDROPDOWN, I think) was sent to the open
> combo, and the flag was cleared. This also lived in WndProc. I think that
> WM_WINDOWPOSCHANGING 'magically' handles both of those events:
>
>     -- handle dropdown
>     elsif iMsg = WM_WINDOWPOSCHANGING then
>         if theDropList then
>             -- close the list
>             result = sendMessage( theDropList, CB_SHOWDROPDOWN, 0, 0 )
>             -- clear the droplist
>             theDropList = 0
>         end if
>
> I hope this helps. The list 'hanging' there is certainly a *weird*
behavior!
>
> -- David Cuny
>