How to move two windows simultaneously...

Hi,

I have two toplevel windows, one is placed directly over the other one and they are both the same width and hight and position. When the top window is moved I need to move the bottom window simultaneously. I have tried handing the WM_MOVING event of the top window and then placing code in that event to move the bottom window.

This works, but it is not smooth. I need both windows to have their position change at the exact same time so that it is seamless!!

How can I do this?
Is there a way? could someone post an example?

P.S Adding one window as a child window is absolutely not an option for me. Just so you know.

Thanks,
Greg

The only way I can think of is to handle the WM_MOVE message in the top window; and post the same message to the bottom window. I wouldn't expect this to be really smooth, though.

Oh, another option is to hide the bottom window, and move it once the top is done moving...

Viggy

Is your top top-level window partially transparent?
If yes - you are out of luck.
If no - as MrViggy suggested, hide the bottom window. Actually, don't even show it later - it is not visible anyway.

Did you look at DeferWindowPos?

I do not know what kind of windows you are moving therefore I have used dialogs in attached sample.
See if moving is smooth enough.