Re: Layered Windows and things drawing through them

From:

"Ivan Brugiolo [MSFT]" <ivanbrug@online.microsoft.com>

Newsgroups:

microsoft.public.vc.language

Date:

Mon, 9 Apr 2007 08:18:50 -0700

Message-ID:

<eaqlhpreHHA.4596@TK2MSFTNGP05.phx.gbl>

Yes, those ideas would would pertain to the situation.
If the controls paint using a screen DC instead of a window DC
they would defeat the redirection bitmap set-up by NtUser for your
window in order to correctly compose your window on the screen.

On the side: the problems you are seeing are one of the reasons why
certain applications mispaints in Vista with desktop composition active,
where the OS provides a redirection bitmap for each top-level window.
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"Golum256" <Golum256@discussions.microsoft.com> wrote in message
news:09F7259E-C03C-476E-B4A0-4C40AB8B36E7@microsoft.com...

Thanx Ivan,

The problem is that these windows are not part of my app. Some of the
buttons from my 2005.net editor draw through. IE : scrollbars from the
editor, buttons from the toolbar, etc.

Would you ideas still pertain in this situation?

TIA

"Ivan Brugiolo [MSFT]" wrote:

More suitable for microsoft.public.win32.programmer.gdi.

I would look at the WS_EX_COMPOSITED style and/or at the
CLIPCHILDREN/CLIPSIBLINGS styles
across your whole hierarchy of windows.
Or possibly, the controls are paiting using a screen-dc instead of using
a
window-dc.

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rights.
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"Golum256" <Golum256@discussions.microsoft.com> wrote in message
news:EC1AF278-C108-48AA-957E-D26695D07C90@microsoft.com...

First off let me apologize if I am submitting this to the wrong
group...

I want my window to fade into view when they are shown, then fade out
later... so I wrote the below snippet of code to react to a timer...

if ( mCurrentAlpha <= 0 ) {
// We have hidden the window so let's get it in a good state...
KillTimer( mTimerIndex );
FadeOutComplete();
mCurrentAlpha = 0;
ShowWindow( SW_HIDE );
::SetLayeredWindowAttributes( GetSafeHwnd(), mOurColorRef, LWA_ALPHA,
0 );

// Turn off the layered style...
SetWindowLong( GetSafeHwnd(), GWL_EXSTYLE, GetWindowLong(GetSafeHwnd(),
GWL_EXSTYLE) & ~WS_EX_LAYERED );
TurnOff( GetSafeHwnd() );
}
else if ( mCurrentAlpha > 255 ) {
// We have shown the window so let's get it in a good state...
SetLayeredWindowAttributes( mOurColorRef, 255, LWA_ALPHA );
KillTimer( mTimerIndex );
FadeInComplete();
mCurrentAlpha = 255;
::SetLayeredWindowAttributes( GetSafeHwnd(), mOurColorRef, LWA_ALPHA,
0 );

// Turn off the layered style...
SetWindowLong( GetSafeHwnd(), GWL_EXSTYLE, GetWindowLong(GetSafeHwnd(),
GWL_EXSTYLE) & ~WS_EX_LAYERED );
TurnOff( GetSafeHwnd() );
}
else {
// Time to step the alpha!!!
SetLayeredWindowAttributes( mOurColorRef, (BYTE)mCurrentAlpha,
LWA_ALPHA );
Invalidate();
mCurrentAlpha += mAlphaStep;
}
}

This works great, HOWEVER... I keep getting controls from windows below
me
drawing above my window... NOT the entire window from below, just some
of
it's controls. My window is created with the topmost flag.

I am currently in the code trying to turn off the Layered window
attribute
when I don't need it ( to see if that would help ).... but it doesn't

Anyone have any idea how I can fix this?

TIA