'\"
'\" Copyright 1992 Regents of the University of California
'\" Permission to use, copy, modify, and distribute this
'\" documentation for any purpose and without fee is hereby
'\" granted, provided that this notice appears in all copies.
'\" The University of California makes no representations about
'\" the suitability of this material for any purpose.  It is
'\" provided "as is" without express or implied warranty.
'\" 
'\" $Header: /rel/cvsfiles/unsupported/latest/tk/doc/tkwait.n,v 1.1 1993/01/24 05:00:30 zoo Exp $ SPRITE (Berkeley)
'/" 
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.HS tkwait cmds
.BS
'\" Note:  do not modify the .SH NAME line immediately below!
.SH NAME
tkwait \- Wait for variable to change or window to be destroyed
.SH SYNOPSIS
\fBtkwait window \fIname\fR
.br
\fBtkwait variable \fIname\fR
.BE

.SH DESCRIPTION
.PP
The \fBtkwait\fR command waits for a window to be destroyed or a
variable to change, then returns without taking any other actions.
The return value is always an empty string.
If the first argument is \fBwindow\fR (or any abbreviation
for it) then the second argument is the name of a window and the
\fBtkwait\fR command waits for that window to be destroyed.
If the second argument is \fBvariable\fR (or any abbreviation for
it) then the second argument is the name of a variable and the
command waits for that variable to be modified.
.PP
While the \fBtkwait\fR command is waiting it processes events in
the normal fashion, so the application will continue to respond
to user interactions.
The \fBtkwait\fR command is used for modal interactions,
such as when a file is to be written and the user must supply
a file name:  \fBtkwait\fR can be used to wait for the user to
enter the file name in a dialog box.
\fBTkwait\fR is often used in conjunction with the \fBgrab\fR
command, to restrict the user's activity to answering a particular
question.
The most common way to use \fBtkwait\fR is to wait for the top-level
window of a dialog box to be destroyed.

.SH KEYWORDS
variable, wait, window
