66 lines
2.7 KiB
Plaintext
66 lines
2.7 KiB
Plaintext
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'\"
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'\" Copyright (c) 1990-1992 The Regents of the University of California.
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'\" All rights reserved.
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'\"
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'\" Permission is hereby granted, without written agreement and without
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'\" license or royalty fees, to use, copy, modify, and distribute this
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'\" documentation for any purpose, provided that the above copyright
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'\" notice and the following two paragraphs appear in all copies.
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'\"
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'\" IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
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'\" FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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'\" ARISING OUT OF THE USE OF THIS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
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'\" CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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'\"
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'\" THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
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'\" INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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'\" AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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'\" ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
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'\" PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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'\"
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'\" $Header: /user6/ouster/wish/man/RCS/update.n,v 1.5 93/04/01 09:53:02 ouster Exp $ SPRITE (Berkeley)
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'/"
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.so man.macros
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.HS update tk
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.BS
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'\" Note: do not modify the .SH NAME line immediately below!
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.SH NAME
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.VS
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update \- Process pending events and/or when-idle handlers
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.SH SYNOPSIS
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\fBupdate\fR ?\fBidletasks\fR?
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.VE
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.BE
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.SH DESCRIPTION
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.PP
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This command is used to bring the entire application world
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``up to date.''
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It flushes all pending output to the display, waits for the
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server to process that output and return errors or events,
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handles all pending events of any sort (including when-idle handlers),
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and repeats this set of operations until there are no pending
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events, no pending when-idle handlers, no pending output to the server,
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and no operations still outstanding at the server.
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.PP
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If the \fBidletasks\fR keyword is specified as an argument to the
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.VS
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command, then no new events or errors are processed; only when-idle
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idlers are invoked.
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This causes operations that are normally deferred, such as display
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updates and window layout calculations, to be performed immediately.
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.PP
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The \fBupdate idletasks\fR command is useful in scripts where
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changes have been made to the application's state and you want those
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changes to appear on the display immediately, rather than waiting
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for the script to complete.
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The \fBupdate\fR command with no options is useful in scripts where
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you are performing a long-running computation but you still want
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the application to respond to user interactions; if you occasionally
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call \fBupdate\fR then user input will be processed during the
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next call to \fBupdate\fR.
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.VE
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.SH KEYWORDS
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event, flush, handler, idle, update
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