Path: utzoo!mnetor!tmsoft!torsqnt!news-server.csri.toronto.edu!rutgers!usc!snorkelwacker!bloom-beacon!SHAMASH.MCRCIM.MCGILL.EDU!mouse
From: mouse@SHAMASH.MCRCIM.MCGILL.EDU (der Mouse)
Newsgroups: comp.windows.x
Subject: Re:  Propagation of Device Event?
Message-ID: <9007140652.AA07301@shamash.McRCIM.McGill.EDU>
Date: 14 Jul 90 06:52:23 GMT
Sender: daemon@athena.mit.edu (Mr Background)
Organization: The Internet
Lines: 49

> 	Assuming window tree hierarchy in the server is:
>                      root
>                     /  | \
>                   c1   A  B
>                   /
>                 c2
> 	and
>             pointer is in c2, 
>             button pressed,
>             no active/passive grabs,
>             no do-not-propagate masks,
>             just normal event distribution in the server.

Well, grabs and do-not-propagate masks are part of normal event
distribution, but aside from that....

> 	the screen appearance is:
>      ---------------------------
>      |                 root    |
>      |   -----------------     |
>      |   |           A   |     |
>      |  --------------   |     |
>      |  |        B   |   |     |
>      |  |            |-----    |
>      |  |      ----  |c1  |    |
>      |  |      |c2|  |    |    |
>      |  |      |x |  |    |    |
>      |  |      ----  |    |    |
>      |  --------------    |    |
>      |   |   --------------    |
>      |   |               |     |
>      |   -----------------     |
>      |                         |
>      ---------------------------

This is not possible.  Given your hierarchy above, c2 can't be in front
of B unless c1 also is.  (All the children of a window W always have
the same relationship as W in the global front-to-back stacking order
relative to any other window X which is neither W nor a child of W.  In
this case, W is c1, the child is c2, and X is B.)

If, however, c1 in your picture is raised to in front of B, all the
answers you gave to your own questions are (according to my own
understanding of event distribution, which may well be flawed) correct.

					der Mouse

			old: mcgill-vision!mouse
			new: mouse@larry.mcrcim.mcgill.edu