diamant@hpfclp.SDE.HP.COM (John Diamant) (08/04/88)
I am looking for a way to find the smallest enclosing window in which the
pointer is located whenever a mouse click occurs. I've tried grabbing
the pointer and getting the buttonpress event. The problem is that
the subwindow returned is the child of the window upon which the grab
was done (typically the root window). But that is the appliation
toplevel window (or the window manager frame if it is a reparenting
window manager). I need to get the smallest window (the one that
would get the input event if all windows had expressed interest
in the event).
I've also tried using XQueryPointer, but it has the same problem (I have
to know the parent of the window I'm interested in). I know I can get
the info by executing successive XQueryPointer calls passing the child
window in as the window each time, but I would probably have to grab the
server to be on the safe side (making sure the pointer didn't move).
That seems kind of anti-social. Is there a better (faster, easier) way
than searching the window tree? It seems as though there should be since
the server clearly knows which window this is in order to generate the
event on it.
Thanks in advance,
John Diamant
Software Development Environments
Hewlett-Packard Co. ARPA Internet: diamant@hpfclp.sde.hp.com
Fort Collins, CO UUCP: {hplabs,hpfcla}!hpfclp!diamantswick@ATHENA.MIT.EDU (Ralph R. Swick) (08/10/88)
XTranslateCoordinates will give you the next lower level of the tree without having to assume the pointer is stationary. You still have to walk the tree yourself.