Re: Controls won't get resized in deep window hierarchies

Hi Nenad,

My window hierarchy is only 8 levels deep. There are tens of sibling
windows (controls) on each level, but I don't know if that has any
influence on the result. Stack size is system default.

The problem has only appeared so far on a few Vista 64 computers (not
all of them) and never on 32-bit OSs (Vista or XP).

If you want, I can run your test app and let you know if I can
reproduce the problem.

Thanks for the custom message idea - I'll give it a try.

All the best,
Cata

On Sun, Apr 19, 2009 at 1:33 PM, Nenad Stefanovic <[email protected]> wrote:
>
>
> This is pretty strange problem. Based on the description, it seems to me
> that it is related to the stack size.
>
> Just for fun, I tried that on Vista 32-bit - I was able to get ~30 levels
> deep. I was also able to go much further by posting a custom message on
> 20-th level, and in handler for that message do the same as WM_SIZE handler
> would do. So, you can do the same - you'll need to change some of the
> classes that you have.
>
> Now, after saying all this, I have to note that if you have more than 15
> level deep hierarchy, you should consider redesigning your app. I know that
> splitters, panes, etc. can easily add depth levels, but over 15 sounds a bit
> extreme.
>
> Cheers,
>
> Nenad
>
> From: [email protected] [mailto:[email protected]] On Behalf Of Catalin
> Rotaru
> Sent: Thursday, April 16, 2009 1:35 PM
> To: [email protected]
> Subject: [wtl] Controls won't get resized in deep window hierarchies
>
> We have an application with a complex hierarchy of Splitters, Pannels
> and Resizable dialog-views. Recently we noticed that on 64-bit Vista
> resizing the main frame would fail to resize the inner-most windows or
> controls.
>
> A bit of research got me to this:
>
> http://blogs.msdn.com/alejacma/archive/2008/11/20/controls-won-t-get-resized
> -once-the-nesting-hierarchy-of-windows-exceeds-a-certain-depth-x64.aspx
>
> Turns out that recursive calls WM_SIZE must not exceed a certain depth
> which on x64 is not very large.
>
> It's a known bug. An awful one. Yet another reason to make me want to
> switch to a HWND-free framework, and to never have to deal with the
> problems and limitations Microsoft has in Windows' controls.
>
> Anyway, the question is now: what to do? Anybody had encountered this
> problem before? Suggestions of a workaround? I can't exactly change my
> hierarchy thus I need a way to deliver the WM_SIZE messages
> non-recursively. But they are triggered by main frame resizes and the
> recursive calls are in CDialogResize, Splitter and Panel. So I am at a
> loss.
>
> Any suggestions are GREATLY appreciated.
>
> Thanks,
> Cata
>


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