Hi Alex,

On 5/8/2018 6:24 AM, Alex Harsanyi wrote:

On Tuesday, May 8, 2018 at 2:08:02 PM UTC+8, gneuner2 wrote:

    So I guess the 1st question to answer is: does the GDI object have
    correct parent HWND?  [The Racket dialog% object has a parent, but
    the underlying display object?]   If it does, there's something weird
    going on in finding the right window to switch to.

I had a look at the application windows using Spy++ and all three windows (the main frame and the two dialog ones) are toplevel windows, as expected; however they are linked together as GetNextWindow/GetPreviousWindow correctly. Unfortunately, I am not very familiar with Windows GDI programming, but I will try to trace the messages to the windows themselves.

I'm not sure why exactly Racket creates "top level" windows everywhere [other than for the annoying issue that style WS_CHILD prevents a window from having a menu bar].  Maybe it's just terminology - i.e. it's not a WS_CHILD, so what do we call it?

Also, if I only open the first dialog, than close it, the main frame does not go to the bottom of the window stack...

Yes. I saw that.  It makes me wonder about how (or even if) Racket is using GetNextWindow.  Since the Racket objects form their own hierarchy, Racket could be walking *that* structure to find the window rather than letting GDI handle it.

Thanks for looking into this.

"Looking into" is perhaps too strong to describe what I did, but you're welcome. <grin>



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