tkwait — Wait for variable to change or window to be destroyed
tkwait variable name
tkwait visibility name
tkwait window name
The tkwait 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
variable (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
visibility (or any abbreviation of it) then the second
argument is the name of a window and the tkwait 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 window (or any
abbreviation of it) then the second argument is the name of a
window and the tkwait 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.
While the tkwait 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 tkwait
again, the nested call to tkwait must complete before the
outer call can complete.
bind, vwait
variable, visibility, wait, window
Copyright © 1992 The Regents of the University of
California.
Copyright © 1994-1996 Sun Microsystems, Inc.