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markom |
'\"
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'\" Copyright (c) 1992 The Regents of the University of California.
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'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
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'\"
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'\" See the file "license.terms" for information on usage and redistribution
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'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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'\"
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'\" RCS: @(#) $Id: tkwait.n,v 1.1.1.1 2002-01-16 10:25:50 markom Exp $
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'\"
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.so man.macros
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.TH tkwait n "" Tk "Tk Built-In Commands"
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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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tkwait \- Wait for variable to change or window to be destroyed
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.SH SYNOPSIS
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\fBtkwait variable \fIname\fR
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.sp
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\fBtkwait visibility \fIname\fR
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.sp
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\fBtkwait window \fIname\fR
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.BE
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.SH DESCRIPTION
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.PP
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The \fBtkwait\fR command waits for one of several things to happen,
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then it returns without taking any other actions.
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The return value is always an empty string.
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If the first argument is \fBvariable\fR (or any abbreviation of
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it) then the second argument is the name of a global variable and the
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command waits for that variable to be modified.
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If the first argument is \fBvisibility\fR (or any abbreviation
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of it) then the second argument is the name of a window and the
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\fBtkwait\fR command waits for a change in its
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visibility state (as indicated by the arrival of a VisibilityNotify
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event). This form is typically used to wait for a newly-created
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window to appear on the screen before taking some action.
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If the first argument is \fBwindow\fR (or any abbreviation
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of it) then the second argument is the name of a window and the
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\fBtkwait\fR command waits for that window to be destroyed.
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This form is typically used to wait for a user to finish interacting
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with a dialog box before using the result of that interaction.
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.PP
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While the \fBtkwait\fR command is waiting it processes events in
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the normal fashion, so the application will continue to respond
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to user interactions.
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If an event handler invokes \fBtkwait\fR again, the nested call
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to \fBtkwait\fR must complete before the outer call can complete.
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.SH KEYWORDS
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variable, visibility, wait, window
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