Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!uunet!infonode!ingr!b11!dwig
From: dwig@b11.ingr.com (David Wiggins)
Newsgroups: comp.windows.x
Subject: Re: save_under quiz for xperts!
Message-ID: <1991May22.132822.20756@b11.ingr.com>
Date: 22 May 91 13:28:22 GMT
References: <9105172046.AA01600@cas.org> <9105201954.AA14669@alex.lcs.mit.edu>
Organization: Intergraph Corp. Huntsville, AL
Lines: 30

gildea@expo.lcs.mit.EDU (Stephen Gildea) writes:

>    If you have save_under specified for a popup window and the
>    contents of the window under the popup changes, what is the
>    correct behavior for a server when the popup is unmapped?

>    A) Restore the contents of the window under the popup, thus losing the
>       changes made while the window was obscured?

>    B) Recognize the contents were changed and send an expose event to the
>       window.

>Remember, if it truly supports save unders, the server should not be
>sending expose events.  Thus neither A nor B is a proper solution.   

The Protocol says:

     If save-under is True, the server is advised that when
     this window is mapped, saving the contents of windows
     it obscures would be beneficial.

I read this to mean that setting save-under was just a hint that the
server could ignore at any time.  With this interpretation, B does not
violate the protocol, and is thus a proper solution.

> < Stephen
>   MIT X Consortium

David P. Wiggins
Intergraph