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From: trs on 17 Dec 2009 15:02
Hi, I'm working on making a splitter window system in pure win32. I
have a main window with a child window, and when the main window
resizes (I catch the WM_SIZE message in my main window wndproc) I call
MoveWindow to resize the child window to maximize it's size within the
parent. I have all the styles set like clipping children , etc so
there isn't any flicker when the child resizes.

I have the option checked to "show window contents while resizing/
dragging", and I on my slower laptop I notice if I grab the lower
right hand corner of the main window and expand the window quickly
with the mouse, I see part of the gray main window background, then a
pause, then the child window "catches up" and paints itself to fill
the void. I would like to get rid of this delay so that as the main
window resizes the child immediately does too so you don't see any
hint of the main window background in the interim.

I would greatly appreciate any ideas, thanks.
From: Preben Friis on 17 Dec 2009 17:43

"trs" <stowellt(a)gmail.com> wrote in message
news:87a5fbc4-14c9-480f-a89a-1d17cdeb6d73(a)x5g2000prf.googlegroups.com...
> I would like to get rid of this delay so that as the main
> window resizes the child immediately does too so you don't see any
> hint of the main window background in the interim.

DeferWindowPos() is the answer you are looking for.

http://blogs.msdn.com/oldnewthing/archive/2005/07/06/436043.aspx

/Preben Friis

From: trs on 18 Dec 2009 10:37
On Dec 17, 3:43 pm, "Preben Friis" <no...(a)technologist.com> wrote:
> "trs" <stowe...(a)gmail.com> wrote in message
>
> news:87a5fbc4-14c9-480f-a89a-1d17cdeb6d73(a)x5g2000prf.googlegroups.com...
>
> > I would like to get rid of this delay so that as the main
> > window resizes the child immediately does too so you don't see any
> > hint of the main window background in the interim.
>
> DeferWindowPos() is the answer you are looking for.
>
> http://blogs.msdn.com/oldnewthing/archive/2005/07/06/436043.aspx
>
> /Preben Friis

Thanks for the information, that link is very interesting. So why does
the lag happen? Is it because the child window doesn't get the size
message until after the parent has already been painted? I thought
MoveWindow sent the paint, size, etc messages directly to the child
windows wndproc so that's why I'm confused about the delay, thanks.
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