CLIM mail archive
Multiprocessing and multi windows
Date: Thu, 23 Sep 1993 19:11 EDT
From: David Perkovic <email@example.com>
A few weeks back I emailed to the group about how I could go about having
multiple windows active at the same time. The only response I received
suggested using multiprocesses which I have tried but have come across
Before I continue I'll just go over what I'm trying to do. I have a number
of units on a window which I want to select and open up another window
which displays the units contents. The problem is I need to then leave the
window open and go back and open another window and displays its contents and
so on. I thought there should be a way to change the focus of the window
and but since nobody replied I assume I can't :-(
Use multiple windows that share the same I/O buffer. You can do this
by SETFing STREAM-INPUT-BUFFER (I think that's what it's called in
CLIM 1.1); in CLIM 2.0, the same hack works using SHEET-EVENT-QUEUE.
You can change the focus by using STREAM-SET-INPUT-FOCUS.
I wish people would get in the habit of using the APROPOS function to
find functionality like this, in CLIM as well as in other tools. Most
of the names chosen in CLIM are not in any way wierd or obscure. Ditto
for most other tools I know of.
I now open up multiple windows using multiple processes but have a problem when
resizing the windows. I have variables local to each procedure and when
clim tries to redraw the window it redraws it in what ever process is
currently active so that what is redrawn is the contents of another window
that is active or it crashes as its in the main (or initial) process and the
variables it needs are undefined.
ie when I resize the window it performs the redraw method within what ever
process is currently active and doesn't use the variables associated with
the right window.
Presumably it is using the per-process state. I don't think using
multiple processes is called for here, at least not from what you
So is there any way to obtain what window is being resized or another
way to go about it?
BTW I'm using Lucid Common Lisp 4.0 and Clim 1.1 on a SparcStation running
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