Alexandre Julliard:
I think GetClipBox is correct, the problem is that the WM_ERASEBKGND handler should not be using it, but GetClientRect. You can try this:
Hello Alexandre,
thank you for your reccomendation. Unfortunately the DefWindowProc improvement does not help, because the default handler newer gets called in my app. The application (Progress _prowin.exe version 7) uses custom dialog boxes (forms) and also custom controls. The controls handle WM_ERASEBKGND themeselves. I have no access to the sources. What I know about GetClipRect, I know from the trace. I agree that your method (GetClientRect in the handler) is much better, but I cannot use it.
I also agree that Windows should return the parent area in GetClipBox as Wine does. Unfortunalelly, the Windows do not do that while the _prowin.exe depends on it. I enclose a simple C example which I hacked to demonstrate this. The example displays two red children in a white parent. The value returned by GetClipBox is wsprintf-ed.
If you run the binary in the Windows, you will see two properly sized red rectangles on a white background. If you run the same binary in Wine, you will see only one large red child but no white parent background. If either the CS_PARENTDC or WS_CLIPSIBLINGS gets removed from my example, both Windows and Wine give identical results.
Regards
Ladislav Sladecek
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Ladislav Sladecek