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

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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