Re: SetWindowRgn kills XP themes??? OR How to BLOCK redraw...

Ok, here is the situation...

I've got some unavoidable "resizing / layouting" issues... ie.. ugly
repainting... not really much I can do about those issues... most
windows/mfc apps have them...

I was able to "hide" them by turning off window repainting on the main
window at key times... but doing so has had side effects... I've spent two
days try to find a solution...

1) SetRedraw(FALSE) / SetRedraw(TRUE) / RedrawWindow() doesn't work to
well since it doesn't stop painting in child windows

2) LockWindowUpdate() / UnlockWindowUpdate() work as advertised, but we
all know the problem with those functions... if too many repaints go on
while the window is locked, you get ugly screen flashes when you unlock...
I'm being a good citizen and only locking my CMainFrame (although I've
tried locking the desktop too).

3) Now my latest solution...

CRgn rgn;
rgn.CreateRectRgn(0, 0, 0, 0);
SetWindowRgn((HRGN)rgn.m_hObject, FALSE);
// do the stuff
SetWindowRgn((HRGN)NULL, TRUE);

This also works as advertised, and with none of the flicker associated
with LockWindowUpdate()...

Problem with this one, is if the developer (user of my DLL library) has
set a custom window rgn, they loose it because I am clearing it for
them...

So again, I try to be a good citizen by saving the current window rgn...

HRGN hRgn = CreateRectRgn(0, 0, 0, 0);
GetWindowRgn(hRgn);
// set empty region
// do the stuff
SetWindowRgn(hRgn);

I'm reseting the region that the window had before my function was
called... well, whoopty-doo... it works...

except when the developer didn't have a custom region... the frame for
some reason looses its XP theming... but maintains its rounded corners...
even in classic mode...

OR

when setting regions and specifying DONT repaint... it decides to repaint
anyways... and I get an ugly effect where parts of windows underneath show
through...