'\" '\" Copyright (c) 1992 The Regents of the University of California. '\" Copyright (c) 1994-1996 Sun Microsystems, Inc. '\" '\" See the file "license.terms" for information on usage and redistribution '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. '\" '\" RCS: @(#) $Id: tkwait.n,v 1.1.1.1 2007/07/10 15:05:16 duncan Exp $ '\" .so man.macros .TH tkwait n "" Tk "Tk Built-In Commands" .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 variable \fIname\fR .sp \fBtkwait visibility \fIname\fR .sp \fBtkwait window \fIname\fR .BE .SH DESCRIPTION .PP The \fBtkwait\fR command waits for one of several things to happen, then it returns without taking any other actions. The return value is always an empty string. If the first argument is \fBvariable\fR (or any abbreviation of it) then the second argument is the name of a global variable and the command waits for that variable to be modified. If the first argument is \fBvisibility\fR (or any abbreviation of it) then the second argument is the name of a window and the \fBtkwait\fR command waits for a change in its visibility state (as indicated by the arrival of a VisibilityNotify event). This form is typically used to wait for a newly-created window to appear on the screen before taking some action. If the first argument is \fBwindow\fR (or any abbreviation of it) then the second argument is the name of a window and the \fBtkwait\fR command waits for that window to be destroyed. This form is typically used to wait for a user to finish interacting with a dialog box before using the result of that interaction. .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. If an event handler invokes \fBtkwait\fR again, the nested call to \fBtkwait\fR must complete before the outer call can complete. .SH KEYWORDS variable, visibility, wait, window