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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)
- '/"
- .so man.macros
- .HS update tk
- .BS
- '\" Note: do not modify the .SH NAME line immediately below!
- .SH NAME
- .VS
- update \- Process pending events and/or when-idle handlers
- .SH SYNOPSIS
- \fBupdate\fR ?\fBidletasks\fR?
- .VE
- .BE
-
- .SH DESCRIPTION
- .PP
- This command is used to bring the entire application world
- ``up to date.''
- It flushes all pending output to the display, waits for the
- server to process that output and return errors or events,
- handles all pending events of any sort (including when-idle handlers),
- and repeats this set of operations until there are no pending
- events, no pending when-idle handlers, no pending output to the server,
- and no operations still outstanding at the server.
- .PP
- If the \fBidletasks\fR keyword is specified as an argument to the
- .VS
- command, then no new events or errors are processed; only when-idle
- idlers are invoked.
- This causes operations that are normally deferred, such as display
- updates and window layout calculations, to be performed immediately.
- .PP
- The \fBupdate idletasks\fR command is useful in scripts where
- changes have been made to the application's state and you want those
- changes to appear on the display immediately, rather than waiting
- for the script to complete.
- The \fBupdate\fR command with no options is useful in scripts where
- you are performing a long-running computation but you still want
- the application to respond to user interactions; if you occasionally
- call \fBupdate\fR then user input will be processed during the
- next call to \fBupdate\fR.
- .VE
-
- .SH KEYWORDS
- event, flush, handler, idle, update
-