Re: transparent window after bringWindowToTop is grey

"David Ching" <>
Fri, 2 May 2008 14:25:58 -0700
"fiversen" <> wrote in message


I have a problem with a transparent window.

My message windows are simple CWnd-Windows, whitch are hide.

if I want to see the window,
I bring them into front with

I want to give the window a transparent border
( later I want to display a transparent bitmap ).

So I have a
- CtrlColor-Func
 it returns NULLBRUSH

- OnEraseBkgnd-Func
 first I paint the full area with NULLBRUSH
 then I reduce the Rect
      r.left += 20
      r.right -= 20
  and fill the small area with a color.

- No OnPaint-Func

But the window is grey.

I have already solutions with transparent Buttons and MarqueeText.
But I hope, only to display a window with transparent background is a
little bit easier.

If this is not a child window, then for transparency, I would make it a
WS_EX_LAYERED_WINDOW. Only with layered windows and Windows regions can you
truly achieve transparency.

Painting with a null brush has no effect at all. As for why the window is
gray, are you by chance calling the inherited OnEraseBkgnd()?

-- David

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